A strontium isotope and trace element geochemical study of dolomite-bearing bentonite deposits in Bavaria (Germany)
Abstract The Landshut bentonites that formed from Ca- and Mg-poor rhyolitic tuffs in a fluviatile-lacustrine depositional environment of the Miocene Upper Freshwater Molasse, southern Germany, contain abundant palustrine, pedogenic and groundwater carbonates. Geochemical analyses of dolomites, calci...
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Gespeichert in:
| Autor*in: |
Köster, Mathias H. [verfasserIn] |
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| Format: |
Artikel |
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| Erschienen: |
2017 |
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| Anmerkung: |
© 2017 by Walter de Gruyter Berlin/Boston |
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| Übergeordnetes Werk: |
Enthalten in: Clay minerals - Mineralogical Society, 1965, 52(2017), 2 vom: 27. Juni, Seite 161-190 |
|---|---|
| Übergeordnetes Werk: |
volume:52 ; year:2017 ; number:2 ; day:27 ; month:06 ; pages:161-190 |
| Links: |
|---|
| DOI / URN: |
10.1180/claymin.2017.052.2.01 |
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OLC2138142515 |
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| 245 | 1 | 0 | |a A strontium isotope and trace element geochemical study of dolomite-bearing bentonite deposits in Bavaria (Germany) |
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| 520 | |a Abstract The Landshut bentonites that formed from Ca- and Mg-poor rhyolitic tuffs in a fluviatile-lacustrine depositional environment of the Miocene Upper Freshwater Molasse, southern Germany, contain abundant palustrine, pedogenic and groundwater carbonates. Geochemical analyses of dolomites, calcites and smectites from bentonites of various environments by X-ray diffraction, thermal ionization mass spectrometry, inductively coupled plasma-mass spectrometry, and handheld X-ray fluorescence yield new insights into the compositions of fluids and sources of imported components involved in carbonate formation and bentonitization, as well as the timing of bentonite formation. Evaporated, Sr-rich brackish surface water with a molar Mg/Ca ratio of 2-5, derived mostly from the weathering of detrital carbonates, was involved in dolomite and bentonite formation in palustrine and some pedogenic environments. However, Sr-poor groundwater with a molar Mg/Ca ratio of ∼ 1 and a stronger silicate weathering component caused bentonite and calcite formation in strictly pedogenic and groundwater settings. The 87Sr/86Sr and molar Mg/Ca in the smectite interlayers indicate later cation exchange with water having more radiogenic Sr sources and smaller molar Mg/Ca ratios. The Rb-Sr data indicate the common presence of detrital illitic phases in the <0.2 μm fractions of the bentonites. Cogenetic palustrine dolomite and a single smectite residue sample which lacks this detrital illitic phase provide an age constraint for bentonitization at 14.7 ± 4.1 Ma identical to primary ash deposition. Thus a rapid onset of bentonitization of accumulated ash and dolomite formation in evaporation-driven wetland environments is indicated for the genesis of the Landshut bentonites. | ||
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10.1180/claymin.2017.052.2.01 doi (DE-627)OLC2138142515 (DE-B1597)claymin.2017.052.2.01-p DE-627 ger DE-627 rakwb 000 550 VZ 13 ssgn Köster, Mathias H. verfasserin aut A strontium isotope and trace element geochemical study of dolomite-bearing bentonite deposits in Bavaria (Germany) 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © 2017 by Walter de Gruyter Berlin/Boston Abstract The Landshut bentonites that formed from Ca- and Mg-poor rhyolitic tuffs in a fluviatile-lacustrine depositional environment of the Miocene Upper Freshwater Molasse, southern Germany, contain abundant palustrine, pedogenic and groundwater carbonates. Geochemical analyses of dolomites, calcites and smectites from bentonites of various environments by X-ray diffraction, thermal ionization mass spectrometry, inductively coupled plasma-mass spectrometry, and handheld X-ray fluorescence yield new insights into the compositions of fluids and sources of imported components involved in carbonate formation and bentonitization, as well as the timing of bentonite formation. Evaporated, Sr-rich brackish surface water with a molar Mg/Ca ratio of 2-5, derived mostly from the weathering of detrital carbonates, was involved in dolomite and bentonite formation in palustrine and some pedogenic environments. However, Sr-poor groundwater with a molar Mg/Ca ratio of ∼ 1 and a stronger silicate weathering component caused bentonite and calcite formation in strictly pedogenic and groundwater settings. The 87Sr/86Sr and molar Mg/Ca in the smectite interlayers indicate later cation exchange with water having more radiogenic Sr sources and smaller molar Mg/Ca ratios. The Rb-Sr data indicate the common presence of detrital illitic phases in the <0.2 μm fractions of the bentonites. Cogenetic palustrine dolomite and a single smectite residue sample which lacks this detrital illitic phase provide an age constraint for bentonitization at 14.7 ± 4.1 Ma identical to primary ash deposition. Thus a rapid onset of bentonitization of accumulated ash and dolomite formation in evaporation-driven wetland environments is indicated for the genesis of the Landshut bentonites. Hölzl, Stefan aut Gilg, H. Albert aut Enthalten in Clay minerals Mineralogical Society, 1965 52(2017), 2 vom: 27. Juni, Seite 161-190 (DE-627)130703907 (DE-600)961059-5 (DE-576)016252330 0009-8558 nnns volume:52 year:2017 number:2 day:27 month:06 pages:161-190 https://doi.org/10.1180/claymin.2017.052.2.01 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_70 GBV_ILN_4219 AR 52 2017 2 27 06 161-190 |
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10.1180/claymin.2017.052.2.01 doi (DE-627)OLC2138142515 (DE-B1597)claymin.2017.052.2.01-p DE-627 ger DE-627 rakwb 000 550 VZ 13 ssgn Köster, Mathias H. verfasserin aut A strontium isotope and trace element geochemical study of dolomite-bearing bentonite deposits in Bavaria (Germany) 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © 2017 by Walter de Gruyter Berlin/Boston Abstract The Landshut bentonites that formed from Ca- and Mg-poor rhyolitic tuffs in a fluviatile-lacustrine depositional environment of the Miocene Upper Freshwater Molasse, southern Germany, contain abundant palustrine, pedogenic and groundwater carbonates. Geochemical analyses of dolomites, calcites and smectites from bentonites of various environments by X-ray diffraction, thermal ionization mass spectrometry, inductively coupled plasma-mass spectrometry, and handheld X-ray fluorescence yield new insights into the compositions of fluids and sources of imported components involved in carbonate formation and bentonitization, as well as the timing of bentonite formation. Evaporated, Sr-rich brackish surface water with a molar Mg/Ca ratio of 2-5, derived mostly from the weathering of detrital carbonates, was involved in dolomite and bentonite formation in palustrine and some pedogenic environments. However, Sr-poor groundwater with a molar Mg/Ca ratio of ∼ 1 and a stronger silicate weathering component caused bentonite and calcite formation in strictly pedogenic and groundwater settings. The 87Sr/86Sr and molar Mg/Ca in the smectite interlayers indicate later cation exchange with water having more radiogenic Sr sources and smaller molar Mg/Ca ratios. The Rb-Sr data indicate the common presence of detrital illitic phases in the <0.2 μm fractions of the bentonites. Cogenetic palustrine dolomite and a single smectite residue sample which lacks this detrital illitic phase provide an age constraint for bentonitization at 14.7 ± 4.1 Ma identical to primary ash deposition. Thus a rapid onset of bentonitization of accumulated ash and dolomite formation in evaporation-driven wetland environments is indicated for the genesis of the Landshut bentonites. Hölzl, Stefan aut Gilg, H. Albert aut Enthalten in Clay minerals Mineralogical Society, 1965 52(2017), 2 vom: 27. Juni, Seite 161-190 (DE-627)130703907 (DE-600)961059-5 (DE-576)016252330 0009-8558 nnns volume:52 year:2017 number:2 day:27 month:06 pages:161-190 https://doi.org/10.1180/claymin.2017.052.2.01 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_70 GBV_ILN_4219 AR 52 2017 2 27 06 161-190 |
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10.1180/claymin.2017.052.2.01 doi (DE-627)OLC2138142515 (DE-B1597)claymin.2017.052.2.01-p DE-627 ger DE-627 rakwb 000 550 VZ 13 ssgn Köster, Mathias H. verfasserin aut A strontium isotope and trace element geochemical study of dolomite-bearing bentonite deposits in Bavaria (Germany) 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © 2017 by Walter de Gruyter Berlin/Boston Abstract The Landshut bentonites that formed from Ca- and Mg-poor rhyolitic tuffs in a fluviatile-lacustrine depositional environment of the Miocene Upper Freshwater Molasse, southern Germany, contain abundant palustrine, pedogenic and groundwater carbonates. Geochemical analyses of dolomites, calcites and smectites from bentonites of various environments by X-ray diffraction, thermal ionization mass spectrometry, inductively coupled plasma-mass spectrometry, and handheld X-ray fluorescence yield new insights into the compositions of fluids and sources of imported components involved in carbonate formation and bentonitization, as well as the timing of bentonite formation. Evaporated, Sr-rich brackish surface water with a molar Mg/Ca ratio of 2-5, derived mostly from the weathering of detrital carbonates, was involved in dolomite and bentonite formation in palustrine and some pedogenic environments. However, Sr-poor groundwater with a molar Mg/Ca ratio of ∼ 1 and a stronger silicate weathering component caused bentonite and calcite formation in strictly pedogenic and groundwater settings. The 87Sr/86Sr and molar Mg/Ca in the smectite interlayers indicate later cation exchange with water having more radiogenic Sr sources and smaller molar Mg/Ca ratios. The Rb-Sr data indicate the common presence of detrital illitic phases in the <0.2 μm fractions of the bentonites. Cogenetic palustrine dolomite and a single smectite residue sample which lacks this detrital illitic phase provide an age constraint for bentonitization at 14.7 ± 4.1 Ma identical to primary ash deposition. Thus a rapid onset of bentonitization of accumulated ash and dolomite formation in evaporation-driven wetland environments is indicated for the genesis of the Landshut bentonites. Hölzl, Stefan aut Gilg, H. Albert aut Enthalten in Clay minerals Mineralogical Society, 1965 52(2017), 2 vom: 27. Juni, Seite 161-190 (DE-627)130703907 (DE-600)961059-5 (DE-576)016252330 0009-8558 nnns volume:52 year:2017 number:2 day:27 month:06 pages:161-190 https://doi.org/10.1180/claymin.2017.052.2.01 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_70 GBV_ILN_4219 AR 52 2017 2 27 06 161-190 |
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10.1180/claymin.2017.052.2.01 doi (DE-627)OLC2138142515 (DE-B1597)claymin.2017.052.2.01-p DE-627 ger DE-627 rakwb 000 550 VZ 13 ssgn Köster, Mathias H. verfasserin aut A strontium isotope and trace element geochemical study of dolomite-bearing bentonite deposits in Bavaria (Germany) 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © 2017 by Walter de Gruyter Berlin/Boston Abstract The Landshut bentonites that formed from Ca- and Mg-poor rhyolitic tuffs in a fluviatile-lacustrine depositional environment of the Miocene Upper Freshwater Molasse, southern Germany, contain abundant palustrine, pedogenic and groundwater carbonates. Geochemical analyses of dolomites, calcites and smectites from bentonites of various environments by X-ray diffraction, thermal ionization mass spectrometry, inductively coupled plasma-mass spectrometry, and handheld X-ray fluorescence yield new insights into the compositions of fluids and sources of imported components involved in carbonate formation and bentonitization, as well as the timing of bentonite formation. Evaporated, Sr-rich brackish surface water with a molar Mg/Ca ratio of 2-5, derived mostly from the weathering of detrital carbonates, was involved in dolomite and bentonite formation in palustrine and some pedogenic environments. However, Sr-poor groundwater with a molar Mg/Ca ratio of ∼ 1 and a stronger silicate weathering component caused bentonite and calcite formation in strictly pedogenic and groundwater settings. The 87Sr/86Sr and molar Mg/Ca in the smectite interlayers indicate later cation exchange with water having more radiogenic Sr sources and smaller molar Mg/Ca ratios. The Rb-Sr data indicate the common presence of detrital illitic phases in the <0.2 μm fractions of the bentonites. Cogenetic palustrine dolomite and a single smectite residue sample which lacks this detrital illitic phase provide an age constraint for bentonitization at 14.7 ± 4.1 Ma identical to primary ash deposition. Thus a rapid onset of bentonitization of accumulated ash and dolomite formation in evaporation-driven wetland environments is indicated for the genesis of the Landshut bentonites. Hölzl, Stefan aut Gilg, H. Albert aut Enthalten in Clay minerals Mineralogical Society, 1965 52(2017), 2 vom: 27. Juni, Seite 161-190 (DE-627)130703907 (DE-600)961059-5 (DE-576)016252330 0009-8558 nnns volume:52 year:2017 number:2 day:27 month:06 pages:161-190 https://doi.org/10.1180/claymin.2017.052.2.01 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_70 GBV_ILN_4219 AR 52 2017 2 27 06 161-190 |
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000 550 VZ 13 ssgn A strontium isotope and trace element geochemical study of dolomite-bearing bentonite deposits in Bavaria (Germany) |
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A strontium isotope and trace element geochemical study of dolomite-bearing bentonite deposits in Bavaria (Germany) |
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A strontium isotope and trace element geochemical study of dolomite-bearing bentonite deposits in Bavaria (Germany) |
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Köster, Mathias H. |
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Köster, Mathias H. Hölzl, Stefan Gilg, H. Albert |
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Köster, Mathias H. |
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10.1180/claymin.2017.052.2.01 |
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000 550 |
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a strontium isotope and trace element geochemical study of dolomite-bearing bentonite deposits in bavaria (germany) |
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A strontium isotope and trace element geochemical study of dolomite-bearing bentonite deposits in Bavaria (Germany) |
| abstract |
Abstract The Landshut bentonites that formed from Ca- and Mg-poor rhyolitic tuffs in a fluviatile-lacustrine depositional environment of the Miocene Upper Freshwater Molasse, southern Germany, contain abundant palustrine, pedogenic and groundwater carbonates. Geochemical analyses of dolomites, calcites and smectites from bentonites of various environments by X-ray diffraction, thermal ionization mass spectrometry, inductively coupled plasma-mass spectrometry, and handheld X-ray fluorescence yield new insights into the compositions of fluids and sources of imported components involved in carbonate formation and bentonitization, as well as the timing of bentonite formation. Evaporated, Sr-rich brackish surface water with a molar Mg/Ca ratio of 2-5, derived mostly from the weathering of detrital carbonates, was involved in dolomite and bentonite formation in palustrine and some pedogenic environments. However, Sr-poor groundwater with a molar Mg/Ca ratio of ∼ 1 and a stronger silicate weathering component caused bentonite and calcite formation in strictly pedogenic and groundwater settings. The 87Sr/86Sr and molar Mg/Ca in the smectite interlayers indicate later cation exchange with water having more radiogenic Sr sources and smaller molar Mg/Ca ratios. The Rb-Sr data indicate the common presence of detrital illitic phases in the <0.2 μm fractions of the bentonites. Cogenetic palustrine dolomite and a single smectite residue sample which lacks this detrital illitic phase provide an age constraint for bentonitization at 14.7 ± 4.1 Ma identical to primary ash deposition. Thus a rapid onset of bentonitization of accumulated ash and dolomite formation in evaporation-driven wetland environments is indicated for the genesis of the Landshut bentonites. © 2017 by Walter de Gruyter Berlin/Boston |
| abstractGer |
Abstract The Landshut bentonites that formed from Ca- and Mg-poor rhyolitic tuffs in a fluviatile-lacustrine depositional environment of the Miocene Upper Freshwater Molasse, southern Germany, contain abundant palustrine, pedogenic and groundwater carbonates. Geochemical analyses of dolomites, calcites and smectites from bentonites of various environments by X-ray diffraction, thermal ionization mass spectrometry, inductively coupled plasma-mass spectrometry, and handheld X-ray fluorescence yield new insights into the compositions of fluids and sources of imported components involved in carbonate formation and bentonitization, as well as the timing of bentonite formation. Evaporated, Sr-rich brackish surface water with a molar Mg/Ca ratio of 2-5, derived mostly from the weathering of detrital carbonates, was involved in dolomite and bentonite formation in palustrine and some pedogenic environments. However, Sr-poor groundwater with a molar Mg/Ca ratio of ∼ 1 and a stronger silicate weathering component caused bentonite and calcite formation in strictly pedogenic and groundwater settings. The 87Sr/86Sr and molar Mg/Ca in the smectite interlayers indicate later cation exchange with water having more radiogenic Sr sources and smaller molar Mg/Ca ratios. The Rb-Sr data indicate the common presence of detrital illitic phases in the <0.2 μm fractions of the bentonites. Cogenetic palustrine dolomite and a single smectite residue sample which lacks this detrital illitic phase provide an age constraint for bentonitization at 14.7 ± 4.1 Ma identical to primary ash deposition. Thus a rapid onset of bentonitization of accumulated ash and dolomite formation in evaporation-driven wetland environments is indicated for the genesis of the Landshut bentonites. © 2017 by Walter de Gruyter Berlin/Boston |
| abstract_unstemmed |
Abstract The Landshut bentonites that formed from Ca- and Mg-poor rhyolitic tuffs in a fluviatile-lacustrine depositional environment of the Miocene Upper Freshwater Molasse, southern Germany, contain abundant palustrine, pedogenic and groundwater carbonates. Geochemical analyses of dolomites, calcites and smectites from bentonites of various environments by X-ray diffraction, thermal ionization mass spectrometry, inductively coupled plasma-mass spectrometry, and handheld X-ray fluorescence yield new insights into the compositions of fluids and sources of imported components involved in carbonate formation and bentonitization, as well as the timing of bentonite formation. Evaporated, Sr-rich brackish surface water with a molar Mg/Ca ratio of 2-5, derived mostly from the weathering of detrital carbonates, was involved in dolomite and bentonite formation in palustrine and some pedogenic environments. However, Sr-poor groundwater with a molar Mg/Ca ratio of ∼ 1 and a stronger silicate weathering component caused bentonite and calcite formation in strictly pedogenic and groundwater settings. The 87Sr/86Sr and molar Mg/Ca in the smectite interlayers indicate later cation exchange with water having more radiogenic Sr sources and smaller molar Mg/Ca ratios. The Rb-Sr data indicate the common presence of detrital illitic phases in the <0.2 μm fractions of the bentonites. Cogenetic palustrine dolomite and a single smectite residue sample which lacks this detrital illitic phase provide an age constraint for bentonitization at 14.7 ± 4.1 Ma identical to primary ash deposition. Thus a rapid onset of bentonitization of accumulated ash and dolomite formation in evaporation-driven wetland environments is indicated for the genesis of the Landshut bentonites. © 2017 by Walter de Gruyter Berlin/Boston |
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| title_short |
A strontium isotope and trace element geochemical study of dolomite-bearing bentonite deposits in Bavaria (Germany) |
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