REE+Y patterns and positive europium anomalies recorded in limestones from zone XX of the Tlayúa Quarry Konservat-Lagerstätte (Tlayúa Formation, Lower Cretaceous; Tepexi de Rodríguez, Mexico)
Abstract Major and trace element concentrations of thirteen limestone samples from zone XX of the Tlayúa Quarry Fossillagerstätte were analysed with the aim of elucidating the source of rare earth elements plus yttrium (REE+Y) as well as some palaeoenvironmental conditions attributable to them. The...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Reygadas-Langarica, Yoatzin [verfasserIn] Sánchez-Beristain, Francisco [verfasserIn] Simon, Klaus [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2020 |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Arabian journal of geosciences - Berlin : Springer, 2008, 13(2020), 20 vom: Okt. |
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| Übergeordnetes Werk: |
volume:13 ; year:2020 ; number:20 ; month:10 |
| Links: |
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| DOI / URN: |
10.1007/s12517-020-06075-2 |
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SPR041244230 |
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| 245 | 1 | 0 | |a REE+Y patterns and positive europium anomalies recorded in limestones from zone XX of the Tlayúa Quarry Konservat-Lagerstätte (Tlayúa Formation, Lower Cretaceous; Tepexi de Rodríguez, Mexico) |
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| 520 | |a Abstract Major and trace element concentrations of thirteen limestone samples from zone XX of the Tlayúa Quarry Fossillagerstätte were analysed with the aim of elucidating the source of rare earth elements plus yttrium (REE+Y) as well as some palaeoenvironmental conditions attributable to them. The concentrations of cortex-derived elements/element oxides ($ SiO_{2} $, $ Al_{2} %$ O_{3} $, Zr), as well as of phosphorus, show no significant contamination by means of terrigenous material and/or phosphates, which means that the REE+Y concentrations can be interpretable. REE+Y patterns display partly typical modern seawater signals, particularly positive La and Y anomalies, mostly superchondritic Y/Ho ratios (between 42.34 and 56.38) and moderate depletions of light rare earth elements (LREE) and middle rare earth elements (MREE) in comparison to heavy rare earth elements (HREE) (x̄ $ Pr_{SN} $/$ Yb_{SN} $ = 0.12, x̄ $ Nd_{SN} $/$ Yb_{SN} $ = 0.14 and x̄ $ Dy_{SN} $/$ Yb_{SN} $ = 0.42, respectively). Negative cerium anomalies could also be identified [(Ce/Ce*SN) = 0.73], which indicate oxidising conditions. In addition, positive Eu anomalies [(Eu/Eu*SN) = 2.53] were detected. Since no convincing evidence for diagenesis, hydrothermal or aeolian input exists, the origin of these anomalies can, to some extent, be attributable to the influence of the dissolution of plagioclases in the water column, which can be inferred from the bivariate correlation of (Eu/Eu*)SN and Na/Al. Despite depicting modern seawater-like signals, an important difference between the REE+Y patterns from zone XX of the Tlayúa Quarry and modern seawater REE+Y patterns can be determined. For instance, modern seawater does not display significant europium anomalies. Nevertheless, REE+Y patterns from zone XX of the Tlayúa Formation can altogether be reliable palaeoenvironmental proxies for the Cretaceous. The inferred palaeoenvironment for zone XX from these proxies is represented by an open-marine setting, showing oxidising conditions, evidence of plagioclase dissolution and overall negligible terrigenous influence. The palaeoecological interpretation from these patterns does not exclude, however, the probability of monsoonal or tidally influenced sedimentation in other sediments from zone XX or from other zones in Tlayúa, as previous works suggest. | ||
| 650 | 4 | |a Tlayúa Formation |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Lower Cretaceous |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Rare earth elements |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Yttrium |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a REE+Y patterns |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Europium anomaly |7 (dpeaa)DE-He213 | |
| 700 | 1 | |a Sánchez-Beristain, Francisco |e verfasserin |4 aut | |
| 700 | 1 | |a Simon, Klaus |e verfasserin |4 aut | |
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10.1007/s12517-020-06075-2 doi (DE-627)SPR041244230 (SPR)s12517-020-06075-2-e DE-627 ger DE-627 rakwb eng 550 ASE Reygadas-Langarica, Yoatzin verfasserin aut REE+Y patterns and positive europium anomalies recorded in limestones from zone XX of the Tlayúa Quarry Konservat-Lagerstätte (Tlayúa Formation, Lower Cretaceous; Tepexi de Rodríguez, Mexico) 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Major and trace element concentrations of thirteen limestone samples from zone XX of the Tlayúa Quarry Fossillagerstätte were analysed with the aim of elucidating the source of rare earth elements plus yttrium (REE+Y) as well as some palaeoenvironmental conditions attributable to them. The concentrations of cortex-derived elements/element oxides ($ SiO_{2} $, $ Al_{2} %$ O_{3} $, Zr), as well as of phosphorus, show no significant contamination by means of terrigenous material and/or phosphates, which means that the REE+Y concentrations can be interpretable. REE+Y patterns display partly typical modern seawater signals, particularly positive La and Y anomalies, mostly superchondritic Y/Ho ratios (between 42.34 and 56.38) and moderate depletions of light rare earth elements (LREE) and middle rare earth elements (MREE) in comparison to heavy rare earth elements (HREE) (x̄ $ Pr_{SN} $/$ Yb_{SN} $ = 0.12, x̄ $ Nd_{SN} $/$ Yb_{SN} $ = 0.14 and x̄ $ Dy_{SN} $/$ Yb_{SN} $ = 0.42, respectively). Negative cerium anomalies could also be identified [(Ce/Ce*SN) = 0.73], which indicate oxidising conditions. In addition, positive Eu anomalies [(Eu/Eu*SN) = 2.53] were detected. Since no convincing evidence for diagenesis, hydrothermal or aeolian input exists, the origin of these anomalies can, to some extent, be attributable to the influence of the dissolution of plagioclases in the water column, which can be inferred from the bivariate correlation of (Eu/Eu*)SN and Na/Al. Despite depicting modern seawater-like signals, an important difference between the REE+Y patterns from zone XX of the Tlayúa Quarry and modern seawater REE+Y patterns can be determined. For instance, modern seawater does not display significant europium anomalies. Nevertheless, REE+Y patterns from zone XX of the Tlayúa Formation can altogether be reliable palaeoenvironmental proxies for the Cretaceous. The inferred palaeoenvironment for zone XX from these proxies is represented by an open-marine setting, showing oxidising conditions, evidence of plagioclase dissolution and overall negligible terrigenous influence. The palaeoecological interpretation from these patterns does not exclude, however, the probability of monsoonal or tidally influenced sedimentation in other sediments from zone XX or from other zones in Tlayúa, as previous works suggest. Tlayúa Formation (dpeaa)DE-He213 Lower Cretaceous (dpeaa)DE-He213 Rare earth elements (dpeaa)DE-He213 Yttrium (dpeaa)DE-He213 REE+Y patterns (dpeaa)DE-He213 Europium anomaly (dpeaa)DE-He213 Sánchez-Beristain, Francisco verfasserin aut Simon, Klaus verfasserin aut Enthalten in Arabian journal of geosciences Berlin : Springer, 2008 13(2020), 20 vom: Okt. (DE-627)572421877 (DE-600)2438771-X 1866-7538 nnns volume:13 year:2020 number:20 month:10 https://dx.doi.org/10.1007/s12517-020-06075-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 13 2020 20 10 |
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10.1007/s12517-020-06075-2 doi (DE-627)SPR041244230 (SPR)s12517-020-06075-2-e DE-627 ger DE-627 rakwb eng 550 ASE Reygadas-Langarica, Yoatzin verfasserin aut REE+Y patterns and positive europium anomalies recorded in limestones from zone XX of the Tlayúa Quarry Konservat-Lagerstätte (Tlayúa Formation, Lower Cretaceous; Tepexi de Rodríguez, Mexico) 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Major and trace element concentrations of thirteen limestone samples from zone XX of the Tlayúa Quarry Fossillagerstätte were analysed with the aim of elucidating the source of rare earth elements plus yttrium (REE+Y) as well as some palaeoenvironmental conditions attributable to them. The concentrations of cortex-derived elements/element oxides ($ SiO_{2} $, $ Al_{2} %$ O_{3} $, Zr), as well as of phosphorus, show no significant contamination by means of terrigenous material and/or phosphates, which means that the REE+Y concentrations can be interpretable. REE+Y patterns display partly typical modern seawater signals, particularly positive La and Y anomalies, mostly superchondritic Y/Ho ratios (between 42.34 and 56.38) and moderate depletions of light rare earth elements (LREE) and middle rare earth elements (MREE) in comparison to heavy rare earth elements (HREE) (x̄ $ Pr_{SN} $/$ Yb_{SN} $ = 0.12, x̄ $ Nd_{SN} $/$ Yb_{SN} $ = 0.14 and x̄ $ Dy_{SN} $/$ Yb_{SN} $ = 0.42, respectively). Negative cerium anomalies could also be identified [(Ce/Ce*SN) = 0.73], which indicate oxidising conditions. In addition, positive Eu anomalies [(Eu/Eu*SN) = 2.53] were detected. Since no convincing evidence for diagenesis, hydrothermal or aeolian input exists, the origin of these anomalies can, to some extent, be attributable to the influence of the dissolution of plagioclases in the water column, which can be inferred from the bivariate correlation of (Eu/Eu*)SN and Na/Al. Despite depicting modern seawater-like signals, an important difference between the REE+Y patterns from zone XX of the Tlayúa Quarry and modern seawater REE+Y patterns can be determined. For instance, modern seawater does not display significant europium anomalies. Nevertheless, REE+Y patterns from zone XX of the Tlayúa Formation can altogether be reliable palaeoenvironmental proxies for the Cretaceous. The inferred palaeoenvironment for zone XX from these proxies is represented by an open-marine setting, showing oxidising conditions, evidence of plagioclase dissolution and overall negligible terrigenous influence. The palaeoecological interpretation from these patterns does not exclude, however, the probability of monsoonal or tidally influenced sedimentation in other sediments from zone XX or from other zones in Tlayúa, as previous works suggest. Tlayúa Formation (dpeaa)DE-He213 Lower Cretaceous (dpeaa)DE-He213 Rare earth elements (dpeaa)DE-He213 Yttrium (dpeaa)DE-He213 REE+Y patterns (dpeaa)DE-He213 Europium anomaly (dpeaa)DE-He213 Sánchez-Beristain, Francisco verfasserin aut Simon, Klaus verfasserin aut Enthalten in Arabian journal of geosciences Berlin : Springer, 2008 13(2020), 20 vom: Okt. (DE-627)572421877 (DE-600)2438771-X 1866-7538 nnns volume:13 year:2020 number:20 month:10 https://dx.doi.org/10.1007/s12517-020-06075-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 13 2020 20 10 |
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10.1007/s12517-020-06075-2 doi (DE-627)SPR041244230 (SPR)s12517-020-06075-2-e DE-627 ger DE-627 rakwb eng 550 ASE Reygadas-Langarica, Yoatzin verfasserin aut REE+Y patterns and positive europium anomalies recorded in limestones from zone XX of the Tlayúa Quarry Konservat-Lagerstätte (Tlayúa Formation, Lower Cretaceous; Tepexi de Rodríguez, Mexico) 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Major and trace element concentrations of thirteen limestone samples from zone XX of the Tlayúa Quarry Fossillagerstätte were analysed with the aim of elucidating the source of rare earth elements plus yttrium (REE+Y) as well as some palaeoenvironmental conditions attributable to them. The concentrations of cortex-derived elements/element oxides ($ SiO_{2} $, $ Al_{2} %$ O_{3} $, Zr), as well as of phosphorus, show no significant contamination by means of terrigenous material and/or phosphates, which means that the REE+Y concentrations can be interpretable. REE+Y patterns display partly typical modern seawater signals, particularly positive La and Y anomalies, mostly superchondritic Y/Ho ratios (between 42.34 and 56.38) and moderate depletions of light rare earth elements (LREE) and middle rare earth elements (MREE) in comparison to heavy rare earth elements (HREE) (x̄ $ Pr_{SN} $/$ Yb_{SN} $ = 0.12, x̄ $ Nd_{SN} $/$ Yb_{SN} $ = 0.14 and x̄ $ Dy_{SN} $/$ Yb_{SN} $ = 0.42, respectively). Negative cerium anomalies could also be identified [(Ce/Ce*SN) = 0.73], which indicate oxidising conditions. In addition, positive Eu anomalies [(Eu/Eu*SN) = 2.53] were detected. Since no convincing evidence for diagenesis, hydrothermal or aeolian input exists, the origin of these anomalies can, to some extent, be attributable to the influence of the dissolution of plagioclases in the water column, which can be inferred from the bivariate correlation of (Eu/Eu*)SN and Na/Al. Despite depicting modern seawater-like signals, an important difference between the REE+Y patterns from zone XX of the Tlayúa Quarry and modern seawater REE+Y patterns can be determined. For instance, modern seawater does not display significant europium anomalies. Nevertheless, REE+Y patterns from zone XX of the Tlayúa Formation can altogether be reliable palaeoenvironmental proxies for the Cretaceous. The inferred palaeoenvironment for zone XX from these proxies is represented by an open-marine setting, showing oxidising conditions, evidence of plagioclase dissolution and overall negligible terrigenous influence. The palaeoecological interpretation from these patterns does not exclude, however, the probability of monsoonal or tidally influenced sedimentation in other sediments from zone XX or from other zones in Tlayúa, as previous works suggest. Tlayúa Formation (dpeaa)DE-He213 Lower Cretaceous (dpeaa)DE-He213 Rare earth elements (dpeaa)DE-He213 Yttrium (dpeaa)DE-He213 REE+Y patterns (dpeaa)DE-He213 Europium anomaly (dpeaa)DE-He213 Sánchez-Beristain, Francisco verfasserin aut Simon, Klaus verfasserin aut Enthalten in Arabian journal of geosciences Berlin : Springer, 2008 13(2020), 20 vom: Okt. (DE-627)572421877 (DE-600)2438771-X 1866-7538 nnns volume:13 year:2020 number:20 month:10 https://dx.doi.org/10.1007/s12517-020-06075-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 13 2020 20 10 |
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10.1007/s12517-020-06075-2 doi (DE-627)SPR041244230 (SPR)s12517-020-06075-2-e DE-627 ger DE-627 rakwb eng 550 ASE Reygadas-Langarica, Yoatzin verfasserin aut REE+Y patterns and positive europium anomalies recorded in limestones from zone XX of the Tlayúa Quarry Konservat-Lagerstätte (Tlayúa Formation, Lower Cretaceous; Tepexi de Rodríguez, Mexico) 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Major and trace element concentrations of thirteen limestone samples from zone XX of the Tlayúa Quarry Fossillagerstätte were analysed with the aim of elucidating the source of rare earth elements plus yttrium (REE+Y) as well as some palaeoenvironmental conditions attributable to them. The concentrations of cortex-derived elements/element oxides ($ SiO_{2} $, $ Al_{2} %$ O_{3} $, Zr), as well as of phosphorus, show no significant contamination by means of terrigenous material and/or phosphates, which means that the REE+Y concentrations can be interpretable. REE+Y patterns display partly typical modern seawater signals, particularly positive La and Y anomalies, mostly superchondritic Y/Ho ratios (between 42.34 and 56.38) and moderate depletions of light rare earth elements (LREE) and middle rare earth elements (MREE) in comparison to heavy rare earth elements (HREE) (x̄ $ Pr_{SN} $/$ Yb_{SN} $ = 0.12, x̄ $ Nd_{SN} $/$ Yb_{SN} $ = 0.14 and x̄ $ Dy_{SN} $/$ Yb_{SN} $ = 0.42, respectively). Negative cerium anomalies could also be identified [(Ce/Ce*SN) = 0.73], which indicate oxidising conditions. In addition, positive Eu anomalies [(Eu/Eu*SN) = 2.53] were detected. Since no convincing evidence for diagenesis, hydrothermal or aeolian input exists, the origin of these anomalies can, to some extent, be attributable to the influence of the dissolution of plagioclases in the water column, which can be inferred from the bivariate correlation of (Eu/Eu*)SN and Na/Al. Despite depicting modern seawater-like signals, an important difference between the REE+Y patterns from zone XX of the Tlayúa Quarry and modern seawater REE+Y patterns can be determined. For instance, modern seawater does not display significant europium anomalies. Nevertheless, REE+Y patterns from zone XX of the Tlayúa Formation can altogether be reliable palaeoenvironmental proxies for the Cretaceous. The inferred palaeoenvironment for zone XX from these proxies is represented by an open-marine setting, showing oxidising conditions, evidence of plagioclase dissolution and overall negligible terrigenous influence. The palaeoecological interpretation from these patterns does not exclude, however, the probability of monsoonal or tidally influenced sedimentation in other sediments from zone XX or from other zones in Tlayúa, as previous works suggest. Tlayúa Formation (dpeaa)DE-He213 Lower Cretaceous (dpeaa)DE-He213 Rare earth elements (dpeaa)DE-He213 Yttrium (dpeaa)DE-He213 REE+Y patterns (dpeaa)DE-He213 Europium anomaly (dpeaa)DE-He213 Sánchez-Beristain, Francisco verfasserin aut Simon, Klaus verfasserin aut Enthalten in Arabian journal of geosciences Berlin : Springer, 2008 13(2020), 20 vom: Okt. (DE-627)572421877 (DE-600)2438771-X 1866-7538 nnns volume:13 year:2020 number:20 month:10 https://dx.doi.org/10.1007/s12517-020-06075-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 13 2020 20 10 |
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10.1007/s12517-020-06075-2 doi (DE-627)SPR041244230 (SPR)s12517-020-06075-2-e DE-627 ger DE-627 rakwb eng 550 ASE Reygadas-Langarica, Yoatzin verfasserin aut REE+Y patterns and positive europium anomalies recorded in limestones from zone XX of the Tlayúa Quarry Konservat-Lagerstätte (Tlayúa Formation, Lower Cretaceous; Tepexi de Rodríguez, Mexico) 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Major and trace element concentrations of thirteen limestone samples from zone XX of the Tlayúa Quarry Fossillagerstätte were analysed with the aim of elucidating the source of rare earth elements plus yttrium (REE+Y) as well as some palaeoenvironmental conditions attributable to them. The concentrations of cortex-derived elements/element oxides ($ SiO_{2} $, $ Al_{2} %$ O_{3} $, Zr), as well as of phosphorus, show no significant contamination by means of terrigenous material and/or phosphates, which means that the REE+Y concentrations can be interpretable. REE+Y patterns display partly typical modern seawater signals, particularly positive La and Y anomalies, mostly superchondritic Y/Ho ratios (between 42.34 and 56.38) and moderate depletions of light rare earth elements (LREE) and middle rare earth elements (MREE) in comparison to heavy rare earth elements (HREE) (x̄ $ Pr_{SN} $/$ Yb_{SN} $ = 0.12, x̄ $ Nd_{SN} $/$ Yb_{SN} $ = 0.14 and x̄ $ Dy_{SN} $/$ Yb_{SN} $ = 0.42, respectively). Negative cerium anomalies could also be identified [(Ce/Ce*SN) = 0.73], which indicate oxidising conditions. In addition, positive Eu anomalies [(Eu/Eu*SN) = 2.53] were detected. Since no convincing evidence for diagenesis, hydrothermal or aeolian input exists, the origin of these anomalies can, to some extent, be attributable to the influence of the dissolution of plagioclases in the water column, which can be inferred from the bivariate correlation of (Eu/Eu*)SN and Na/Al. Despite depicting modern seawater-like signals, an important difference between the REE+Y patterns from zone XX of the Tlayúa Quarry and modern seawater REE+Y patterns can be determined. For instance, modern seawater does not display significant europium anomalies. Nevertheless, REE+Y patterns from zone XX of the Tlayúa Formation can altogether be reliable palaeoenvironmental proxies for the Cretaceous. The inferred palaeoenvironment for zone XX from these proxies is represented by an open-marine setting, showing oxidising conditions, evidence of plagioclase dissolution and overall negligible terrigenous influence. The palaeoecological interpretation from these patterns does not exclude, however, the probability of monsoonal or tidally influenced sedimentation in other sediments from zone XX or from other zones in Tlayúa, as previous works suggest. Tlayúa Formation (dpeaa)DE-He213 Lower Cretaceous (dpeaa)DE-He213 Rare earth elements (dpeaa)DE-He213 Yttrium (dpeaa)DE-He213 REE+Y patterns (dpeaa)DE-He213 Europium anomaly (dpeaa)DE-He213 Sánchez-Beristain, Francisco verfasserin aut Simon, Klaus verfasserin aut Enthalten in Arabian journal of geosciences Berlin : Springer, 2008 13(2020), 20 vom: Okt. (DE-627)572421877 (DE-600)2438771-X 1866-7538 nnns volume:13 year:2020 number:20 month:10 https://dx.doi.org/10.1007/s12517-020-06075-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 13 2020 20 10 |
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Enthalten in Arabian journal of geosciences 13(2020), 20 vom: Okt. volume:13 year:2020 number:20 month:10 |
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Tlayúa Formation Lower Cretaceous Rare earth elements Yttrium REE+Y patterns Europium anomaly |
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Reygadas-Langarica, Yoatzin @@aut@@ Sánchez-Beristain, Francisco @@aut@@ Simon, Klaus @@aut@@ |
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The concentrations of cortex-derived elements/element oxides ($ SiO_{2} $, $ Al_{2} %$ O_{3} $, Zr), as well as of phosphorus, show no significant contamination by means of terrigenous material and/or phosphates, which means that the REE+Y concentrations can be interpretable. REE+Y patterns display partly typical modern seawater signals, particularly positive La and Y anomalies, mostly superchondritic Y/Ho ratios (between 42.34 and 56.38) and moderate depletions of light rare earth elements (LREE) and middle rare earth elements (MREE) in comparison to heavy rare earth elements (HREE) (x̄ $ Pr_{SN} $/$ Yb_{SN} $ = 0.12, x̄ $ Nd_{SN} $/$ Yb_{SN} $ = 0.14 and x̄ $ Dy_{SN} $/$ Yb_{SN} $ = 0.42, respectively). Negative cerium anomalies could also be identified [(Ce/Ce*SN) = 0.73], which indicate oxidising conditions. In addition, positive Eu anomalies [(Eu/Eu*SN) = 2.53] were detected. Since no convincing evidence for diagenesis, hydrothermal or aeolian input exists, the origin of these anomalies can, to some extent, be attributable to the influence of the dissolution of plagioclases in the water column, which can be inferred from the bivariate correlation of (Eu/Eu*)SN and Na/Al. Despite depicting modern seawater-like signals, an important difference between the REE+Y patterns from zone XX of the Tlayúa Quarry and modern seawater REE+Y patterns can be determined. For instance, modern seawater does not display significant europium anomalies. Nevertheless, REE+Y patterns from zone XX of the Tlayúa Formation can altogether be reliable palaeoenvironmental proxies for the Cretaceous. The inferred palaeoenvironment for zone XX from these proxies is represented by an open-marine setting, showing oxidising conditions, evidence of plagioclase dissolution and overall negligible terrigenous influence. The palaeoecological interpretation from these patterns does not exclude, however, the probability of monsoonal or tidally influenced sedimentation in other sediments from zone XX or from other zones in Tlayúa, as previous works suggest.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Tlayúa Formation</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Lower Cretaceous</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Rare earth elements</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Yttrium</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">REE+Y patterns</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " 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Reygadas-Langarica, Yoatzin |
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Reygadas-Langarica, Yoatzin ddc 550 misc Tlayúa Formation misc Lower Cretaceous misc Rare earth elements misc Yttrium misc REE+Y patterns misc Europium anomaly REE+Y patterns and positive europium anomalies recorded in limestones from zone XX of the Tlayúa Quarry Konservat-Lagerstätte (Tlayúa Formation, Lower Cretaceous; Tepexi de Rodríguez, Mexico) |
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550 ASE REE+Y patterns and positive europium anomalies recorded in limestones from zone XX of the Tlayúa Quarry Konservat-Lagerstätte (Tlayúa Formation, Lower Cretaceous; Tepexi de Rodríguez, Mexico) Tlayúa Formation (dpeaa)DE-He213 Lower Cretaceous (dpeaa)DE-He213 Rare earth elements (dpeaa)DE-He213 Yttrium (dpeaa)DE-He213 REE+Y patterns (dpeaa)DE-He213 Europium anomaly (dpeaa)DE-He213 |
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ddc 550 misc Tlayúa Formation misc Lower Cretaceous misc Rare earth elements misc Yttrium misc REE+Y patterns misc Europium anomaly |
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REE+Y patterns and positive europium anomalies recorded in limestones from zone XX of the Tlayúa Quarry Konservat-Lagerstätte (Tlayúa Formation, Lower Cretaceous; Tepexi de Rodríguez, Mexico) |
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REE+Y patterns and positive europium anomalies recorded in limestones from zone XX of the Tlayúa Quarry Konservat-Lagerstätte (Tlayúa Formation, Lower Cretaceous; Tepexi de Rodríguez, Mexico) |
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Reygadas-Langarica, Yoatzin Sánchez-Beristain, Francisco Simon, Klaus |
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Reygadas-Langarica, Yoatzin |
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10.1007/s12517-020-06075-2 |
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verfasserin |
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ree+y patterns and positive europium anomalies recorded in limestones from zone xx of the tlayúa quarry konservat-lagerstätte (tlayúa formation, lower cretaceous; tepexi de rodríguez, mexico) |
| title_auth |
REE+Y patterns and positive europium anomalies recorded in limestones from zone XX of the Tlayúa Quarry Konservat-Lagerstätte (Tlayúa Formation, Lower Cretaceous; Tepexi de Rodríguez, Mexico) |
| abstract |
Abstract Major and trace element concentrations of thirteen limestone samples from zone XX of the Tlayúa Quarry Fossillagerstätte were analysed with the aim of elucidating the source of rare earth elements plus yttrium (REE+Y) as well as some palaeoenvironmental conditions attributable to them. The concentrations of cortex-derived elements/element oxides ($ SiO_{2} $, $ Al_{2} %$ O_{3} $, Zr), as well as of phosphorus, show no significant contamination by means of terrigenous material and/or phosphates, which means that the REE+Y concentrations can be interpretable. REE+Y patterns display partly typical modern seawater signals, particularly positive La and Y anomalies, mostly superchondritic Y/Ho ratios (between 42.34 and 56.38) and moderate depletions of light rare earth elements (LREE) and middle rare earth elements (MREE) in comparison to heavy rare earth elements (HREE) (x̄ $ Pr_{SN} $/$ Yb_{SN} $ = 0.12, x̄ $ Nd_{SN} $/$ Yb_{SN} $ = 0.14 and x̄ $ Dy_{SN} $/$ Yb_{SN} $ = 0.42, respectively). Negative cerium anomalies could also be identified [(Ce/Ce*SN) = 0.73], which indicate oxidising conditions. In addition, positive Eu anomalies [(Eu/Eu*SN) = 2.53] were detected. Since no convincing evidence for diagenesis, hydrothermal or aeolian input exists, the origin of these anomalies can, to some extent, be attributable to the influence of the dissolution of plagioclases in the water column, which can be inferred from the bivariate correlation of (Eu/Eu*)SN and Na/Al. Despite depicting modern seawater-like signals, an important difference between the REE+Y patterns from zone XX of the Tlayúa Quarry and modern seawater REE+Y patterns can be determined. For instance, modern seawater does not display significant europium anomalies. Nevertheless, REE+Y patterns from zone XX of the Tlayúa Formation can altogether be reliable palaeoenvironmental proxies for the Cretaceous. The inferred palaeoenvironment for zone XX from these proxies is represented by an open-marine setting, showing oxidising conditions, evidence of plagioclase dissolution and overall negligible terrigenous influence. The palaeoecological interpretation from these patterns does not exclude, however, the probability of monsoonal or tidally influenced sedimentation in other sediments from zone XX or from other zones in Tlayúa, as previous works suggest. |
| abstractGer |
Abstract Major and trace element concentrations of thirteen limestone samples from zone XX of the Tlayúa Quarry Fossillagerstätte were analysed with the aim of elucidating the source of rare earth elements plus yttrium (REE+Y) as well as some palaeoenvironmental conditions attributable to them. The concentrations of cortex-derived elements/element oxides ($ SiO_{2} $, $ Al_{2} %$ O_{3} $, Zr), as well as of phosphorus, show no significant contamination by means of terrigenous material and/or phosphates, which means that the REE+Y concentrations can be interpretable. REE+Y patterns display partly typical modern seawater signals, particularly positive La and Y anomalies, mostly superchondritic Y/Ho ratios (between 42.34 and 56.38) and moderate depletions of light rare earth elements (LREE) and middle rare earth elements (MREE) in comparison to heavy rare earth elements (HREE) (x̄ $ Pr_{SN} $/$ Yb_{SN} $ = 0.12, x̄ $ Nd_{SN} $/$ Yb_{SN} $ = 0.14 and x̄ $ Dy_{SN} $/$ Yb_{SN} $ = 0.42, respectively). Negative cerium anomalies could also be identified [(Ce/Ce*SN) = 0.73], which indicate oxidising conditions. In addition, positive Eu anomalies [(Eu/Eu*SN) = 2.53] were detected. Since no convincing evidence for diagenesis, hydrothermal or aeolian input exists, the origin of these anomalies can, to some extent, be attributable to the influence of the dissolution of plagioclases in the water column, which can be inferred from the bivariate correlation of (Eu/Eu*)SN and Na/Al. Despite depicting modern seawater-like signals, an important difference between the REE+Y patterns from zone XX of the Tlayúa Quarry and modern seawater REE+Y patterns can be determined. For instance, modern seawater does not display significant europium anomalies. Nevertheless, REE+Y patterns from zone XX of the Tlayúa Formation can altogether be reliable palaeoenvironmental proxies for the Cretaceous. The inferred palaeoenvironment for zone XX from these proxies is represented by an open-marine setting, showing oxidising conditions, evidence of plagioclase dissolution and overall negligible terrigenous influence. The palaeoecological interpretation from these patterns does not exclude, however, the probability of monsoonal or tidally influenced sedimentation in other sediments from zone XX or from other zones in Tlayúa, as previous works suggest. |
| abstract_unstemmed |
Abstract Major and trace element concentrations of thirteen limestone samples from zone XX of the Tlayúa Quarry Fossillagerstätte were analysed with the aim of elucidating the source of rare earth elements plus yttrium (REE+Y) as well as some palaeoenvironmental conditions attributable to them. The concentrations of cortex-derived elements/element oxides ($ SiO_{2} $, $ Al_{2} %$ O_{3} $, Zr), as well as of phosphorus, show no significant contamination by means of terrigenous material and/or phosphates, which means that the REE+Y concentrations can be interpretable. REE+Y patterns display partly typical modern seawater signals, particularly positive La and Y anomalies, mostly superchondritic Y/Ho ratios (between 42.34 and 56.38) and moderate depletions of light rare earth elements (LREE) and middle rare earth elements (MREE) in comparison to heavy rare earth elements (HREE) (x̄ $ Pr_{SN} $/$ Yb_{SN} $ = 0.12, x̄ $ Nd_{SN} $/$ Yb_{SN} $ = 0.14 and x̄ $ Dy_{SN} $/$ Yb_{SN} $ = 0.42, respectively). Negative cerium anomalies could also be identified [(Ce/Ce*SN) = 0.73], which indicate oxidising conditions. In addition, positive Eu anomalies [(Eu/Eu*SN) = 2.53] were detected. Since no convincing evidence for diagenesis, hydrothermal or aeolian input exists, the origin of these anomalies can, to some extent, be attributable to the influence of the dissolution of plagioclases in the water column, which can be inferred from the bivariate correlation of (Eu/Eu*)SN and Na/Al. Despite depicting modern seawater-like signals, an important difference between the REE+Y patterns from zone XX of the Tlayúa Quarry and modern seawater REE+Y patterns can be determined. For instance, modern seawater does not display significant europium anomalies. Nevertheless, REE+Y patterns from zone XX of the Tlayúa Formation can altogether be reliable palaeoenvironmental proxies for the Cretaceous. The inferred palaeoenvironment for zone XX from these proxies is represented by an open-marine setting, showing oxidising conditions, evidence of plagioclase dissolution and overall negligible terrigenous influence. The palaeoecological interpretation from these patterns does not exclude, however, the probability of monsoonal or tidally influenced sedimentation in other sediments from zone XX or from other zones in Tlayúa, as previous works suggest. |
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| title_short |
REE+Y patterns and positive europium anomalies recorded in limestones from zone XX of the Tlayúa Quarry Konservat-Lagerstätte (Tlayúa Formation, Lower Cretaceous; Tepexi de Rodríguez, Mexico) |
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Sánchez-Beristain, Francisco Simon, Klaus |
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| score |
7.3997526 |