U–Pb age and Lu–Hf isotopic data of detrital zircons from the Neoproterozoic Damara Sequence: Implications for Congo and Kalahari before Gondwana
The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zi...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Foster, David A. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2015transfer abstract |
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| Umfang: |
12 |
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| Übergeordnetes Werk: |
Enthalten in: Editorial Board - 2016, international geoscience journal : official journal of the International Association for Gondwana Research, Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:28 ; year:2015 ; number:1 ; pages:179-190 ; extent:12 |
| Links: |
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| DOI / URN: |
10.1016/j.gr.2014.04.011 |
|---|
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ELV02924899X |
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| 245 | 1 | 0 | |a U–Pb age and Lu–Hf isotopic data of detrital zircons from the Neoproterozoic Damara Sequence: Implications for Congo and Kalahari before Gondwana |
| 264 | 1 | |c 2015transfer abstract | |
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| 520 | |a The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zircon U–Pb age distributions that correspond to the ages of prominent crustal components within the respective cratons. The most abundant zircons from Neoproterozoic strata deposited on the Congo margin give ages of 1150–1000 and 800–600Ma, whereas, the most abundant zircons from the Kalahari margin strata range from 1350 to 1100Ma. A 1350–1200Ma detrital zircon population in the Kalahari margin strata is absent in the Damara–Congo strata. A prominent c. 1050–1000Ma detrital zircon age population from Damara–Congo strata is nearly absent from the Damara–Kalahari strata, even though orogenic events of this age are found on both cratons. Damara strata on the Kalahari margin also lack detrital zircons with U–Pb ages of 900–600Ma. The differences in detrital zircon age distributions are robust when comparing strata of the same age on both cratons, and remains so, even when younger, deeper water facies are excluded, which could have been biased by other sediment sources. These data suggest that the Congo and Kalahari cratons were not proximal in Rodinia, and did not establish their current relative positions until the end of the Neoproterozoic when they were sutured together during the collisional orogenies that formed Gondwana. | ||
| 520 | |a The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zircon U–Pb age distributions that correspond to the ages of prominent crustal components within the respective cratons. The most abundant zircons from Neoproterozoic strata deposited on the Congo margin give ages of 1150–1000 and 800–600Ma, whereas, the most abundant zircons from the Kalahari margin strata range from 1350 to 1100Ma. A 1350–1200Ma detrital zircon population in the Kalahari margin strata is absent in the Damara–Congo strata. A prominent c. 1050–1000Ma detrital zircon age population from Damara–Congo strata is nearly absent from the Damara–Kalahari strata, even though orogenic events of this age are found on both cratons. Damara strata on the Kalahari margin also lack detrital zircons with U–Pb ages of 900–600Ma. The differences in detrital zircon age distributions are robust when comparing strata of the same age on both cratons, and remains so, even when younger, deeper water facies are excluded, which could have been biased by other sediment sources. These data suggest that the Congo and Kalahari cratons were not proximal in Rodinia, and did not establish their current relative positions until the end of the Neoproterozoic when they were sutured together during the collisional orogenies that formed Gondwana. | ||
| 700 | 1 | |a Goscombe, Ben D. |4 oth | |
| 700 | 1 | |a Newstead, Brittany |4 oth | |
| 700 | 1 | |a Mapani, Ben |4 oth | |
| 700 | 1 | |a Mueller, Paul A. |4 oth | |
| 700 | 1 | |a Gregory, Laura C. |4 oth | |
| 700 | 1 | |a Muvangua, Ewereth |4 oth | |
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10.1016/j.gr.2014.04.011 doi GBVA2015019000007.pica (DE-627)ELV02924899X (ELSEVIER)S1342-937X(14)00176-2 DE-627 ger DE-627 rakwb eng 550 550 DE-600 530 VZ 620 VZ Foster, David A. verfasserin aut U–Pb age and Lu–Hf isotopic data of detrital zircons from the Neoproterozoic Damara Sequence: Implications for Congo and Kalahari before Gondwana 2015transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zircon U–Pb age distributions that correspond to the ages of prominent crustal components within the respective cratons. The most abundant zircons from Neoproterozoic strata deposited on the Congo margin give ages of 1150–1000 and 800–600Ma, whereas, the most abundant zircons from the Kalahari margin strata range from 1350 to 1100Ma. A 1350–1200Ma detrital zircon population in the Kalahari margin strata is absent in the Damara–Congo strata. A prominent c. 1050–1000Ma detrital zircon age population from Damara–Congo strata is nearly absent from the Damara–Kalahari strata, even though orogenic events of this age are found on both cratons. Damara strata on the Kalahari margin also lack detrital zircons with U–Pb ages of 900–600Ma. The differences in detrital zircon age distributions are robust when comparing strata of the same age on both cratons, and remains so, even when younger, deeper water facies are excluded, which could have been biased by other sediment sources. These data suggest that the Congo and Kalahari cratons were not proximal in Rodinia, and did not establish their current relative positions until the end of the Neoproterozoic when they were sutured together during the collisional orogenies that formed Gondwana. The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zircon U–Pb age distributions that correspond to the ages of prominent crustal components within the respective cratons. The most abundant zircons from Neoproterozoic strata deposited on the Congo margin give ages of 1150–1000 and 800–600Ma, whereas, the most abundant zircons from the Kalahari margin strata range from 1350 to 1100Ma. A 1350–1200Ma detrital zircon population in the Kalahari margin strata is absent in the Damara–Congo strata. A prominent c. 1050–1000Ma detrital zircon age population from Damara–Congo strata is nearly absent from the Damara–Kalahari strata, even though orogenic events of this age are found on both cratons. Damara strata on the Kalahari margin also lack detrital zircons with U–Pb ages of 900–600Ma. The differences in detrital zircon age distributions are robust when comparing strata of the same age on both cratons, and remains so, even when younger, deeper water facies are excluded, which could have been biased by other sediment sources. These data suggest that the Congo and Kalahari cratons were not proximal in Rodinia, and did not establish their current relative positions until the end of the Neoproterozoic when they were sutured together during the collisional orogenies that formed Gondwana. Goscombe, Ben D. oth Newstead, Brittany oth Mapani, Ben oth Mueller, Paul A. oth Gregory, Laura C. oth Muvangua, Ewereth oth Enthalten in Elsevier Editorial Board 2016 international geoscience journal : official journal of the International Association for Gondwana Research Amsterdam [u.a.] (DE-627)ELV014379600 volume:28 year:2015 number:1 pages:179-190 extent:12 https://doi.org/10.1016/j.gr.2014.04.011 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_40 GBV_ILN_2001 GBV_ILN_2010 GBV_ILN_2014 GBV_ILN_2015 AR 28 2015 1 179-190 12 045F 550 |
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10.1016/j.gr.2014.04.011 doi GBVA2015019000007.pica (DE-627)ELV02924899X (ELSEVIER)S1342-937X(14)00176-2 DE-627 ger DE-627 rakwb eng 550 550 DE-600 530 VZ 620 VZ Foster, David A. verfasserin aut U–Pb age and Lu–Hf isotopic data of detrital zircons from the Neoproterozoic Damara Sequence: Implications for Congo and Kalahari before Gondwana 2015transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zircon U–Pb age distributions that correspond to the ages of prominent crustal components within the respective cratons. The most abundant zircons from Neoproterozoic strata deposited on the Congo margin give ages of 1150–1000 and 800–600Ma, whereas, the most abundant zircons from the Kalahari margin strata range from 1350 to 1100Ma. A 1350–1200Ma detrital zircon population in the Kalahari margin strata is absent in the Damara–Congo strata. A prominent c. 1050–1000Ma detrital zircon age population from Damara–Congo strata is nearly absent from the Damara–Kalahari strata, even though orogenic events of this age are found on both cratons. Damara strata on the Kalahari margin also lack detrital zircons with U–Pb ages of 900–600Ma. The differences in detrital zircon age distributions are robust when comparing strata of the same age on both cratons, and remains so, even when younger, deeper water facies are excluded, which could have been biased by other sediment sources. These data suggest that the Congo and Kalahari cratons were not proximal in Rodinia, and did not establish their current relative positions until the end of the Neoproterozoic when they were sutured together during the collisional orogenies that formed Gondwana. The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zircon U–Pb age distributions that correspond to the ages of prominent crustal components within the respective cratons. The most abundant zircons from Neoproterozoic strata deposited on the Congo margin give ages of 1150–1000 and 800–600Ma, whereas, the most abundant zircons from the Kalahari margin strata range from 1350 to 1100Ma. A 1350–1200Ma detrital zircon population in the Kalahari margin strata is absent in the Damara–Congo strata. A prominent c. 1050–1000Ma detrital zircon age population from Damara–Congo strata is nearly absent from the Damara–Kalahari strata, even though orogenic events of this age are found on both cratons. Damara strata on the Kalahari margin also lack detrital zircons with U–Pb ages of 900–600Ma. The differences in detrital zircon age distributions are robust when comparing strata of the same age on both cratons, and remains so, even when younger, deeper water facies are excluded, which could have been biased by other sediment sources. These data suggest that the Congo and Kalahari cratons were not proximal in Rodinia, and did not establish their current relative positions until the end of the Neoproterozoic when they were sutured together during the collisional orogenies that formed Gondwana. Goscombe, Ben D. oth Newstead, Brittany oth Mapani, Ben oth Mueller, Paul A. oth Gregory, Laura C. oth Muvangua, Ewereth oth Enthalten in Elsevier Editorial Board 2016 international geoscience journal : official journal of the International Association for Gondwana Research Amsterdam [u.a.] (DE-627)ELV014379600 volume:28 year:2015 number:1 pages:179-190 extent:12 https://doi.org/10.1016/j.gr.2014.04.011 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_40 GBV_ILN_2001 GBV_ILN_2010 GBV_ILN_2014 GBV_ILN_2015 AR 28 2015 1 179-190 12 045F 550 |
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10.1016/j.gr.2014.04.011 doi GBVA2015019000007.pica (DE-627)ELV02924899X (ELSEVIER)S1342-937X(14)00176-2 DE-627 ger DE-627 rakwb eng 550 550 DE-600 530 VZ 620 VZ Foster, David A. verfasserin aut U–Pb age and Lu–Hf isotopic data of detrital zircons from the Neoproterozoic Damara Sequence: Implications for Congo and Kalahari before Gondwana 2015transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zircon U–Pb age distributions that correspond to the ages of prominent crustal components within the respective cratons. The most abundant zircons from Neoproterozoic strata deposited on the Congo margin give ages of 1150–1000 and 800–600Ma, whereas, the most abundant zircons from the Kalahari margin strata range from 1350 to 1100Ma. A 1350–1200Ma detrital zircon population in the Kalahari margin strata is absent in the Damara–Congo strata. A prominent c. 1050–1000Ma detrital zircon age population from Damara–Congo strata is nearly absent from the Damara–Kalahari strata, even though orogenic events of this age are found on both cratons. Damara strata on the Kalahari margin also lack detrital zircons with U–Pb ages of 900–600Ma. The differences in detrital zircon age distributions are robust when comparing strata of the same age on both cratons, and remains so, even when younger, deeper water facies are excluded, which could have been biased by other sediment sources. These data suggest that the Congo and Kalahari cratons were not proximal in Rodinia, and did not establish their current relative positions until the end of the Neoproterozoic when they were sutured together during the collisional orogenies that formed Gondwana. The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zircon U–Pb age distributions that correspond to the ages of prominent crustal components within the respective cratons. The most abundant zircons from Neoproterozoic strata deposited on the Congo margin give ages of 1150–1000 and 800–600Ma, whereas, the most abundant zircons from the Kalahari margin strata range from 1350 to 1100Ma. A 1350–1200Ma detrital zircon population in the Kalahari margin strata is absent in the Damara–Congo strata. A prominent c. 1050–1000Ma detrital zircon age population from Damara–Congo strata is nearly absent from the Damara–Kalahari strata, even though orogenic events of this age are found on both cratons. Damara strata on the Kalahari margin also lack detrital zircons with U–Pb ages of 900–600Ma. The differences in detrital zircon age distributions are robust when comparing strata of the same age on both cratons, and remains so, even when younger, deeper water facies are excluded, which could have been biased by other sediment sources. These data suggest that the Congo and Kalahari cratons were not proximal in Rodinia, and did not establish their current relative positions until the end of the Neoproterozoic when they were sutured together during the collisional orogenies that formed Gondwana. Goscombe, Ben D. oth Newstead, Brittany oth Mapani, Ben oth Mueller, Paul A. oth Gregory, Laura C. oth Muvangua, Ewereth oth Enthalten in Elsevier Editorial Board 2016 international geoscience journal : official journal of the International Association for Gondwana Research Amsterdam [u.a.] (DE-627)ELV014379600 volume:28 year:2015 number:1 pages:179-190 extent:12 https://doi.org/10.1016/j.gr.2014.04.011 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_40 GBV_ILN_2001 GBV_ILN_2010 GBV_ILN_2014 GBV_ILN_2015 AR 28 2015 1 179-190 12 045F 550 |
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10.1016/j.gr.2014.04.011 doi GBVA2015019000007.pica (DE-627)ELV02924899X (ELSEVIER)S1342-937X(14)00176-2 DE-627 ger DE-627 rakwb eng 550 550 DE-600 530 VZ 620 VZ Foster, David A. verfasserin aut U–Pb age and Lu–Hf isotopic data of detrital zircons from the Neoproterozoic Damara Sequence: Implications for Congo and Kalahari before Gondwana 2015transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zircon U–Pb age distributions that correspond to the ages of prominent crustal components within the respective cratons. The most abundant zircons from Neoproterozoic strata deposited on the Congo margin give ages of 1150–1000 and 800–600Ma, whereas, the most abundant zircons from the Kalahari margin strata range from 1350 to 1100Ma. A 1350–1200Ma detrital zircon population in the Kalahari margin strata is absent in the Damara–Congo strata. A prominent c. 1050–1000Ma detrital zircon age population from Damara–Congo strata is nearly absent from the Damara–Kalahari strata, even though orogenic events of this age are found on both cratons. Damara strata on the Kalahari margin also lack detrital zircons with U–Pb ages of 900–600Ma. The differences in detrital zircon age distributions are robust when comparing strata of the same age on both cratons, and remains so, even when younger, deeper water facies are excluded, which could have been biased by other sediment sources. These data suggest that the Congo and Kalahari cratons were not proximal in Rodinia, and did not establish their current relative positions until the end of the Neoproterozoic when they were sutured together during the collisional orogenies that formed Gondwana. The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zircon U–Pb age distributions that correspond to the ages of prominent crustal components within the respective cratons. The most abundant zircons from Neoproterozoic strata deposited on the Congo margin give ages of 1150–1000 and 800–600Ma, whereas, the most abundant zircons from the Kalahari margin strata range from 1350 to 1100Ma. A 1350–1200Ma detrital zircon population in the Kalahari margin strata is absent in the Damara–Congo strata. A prominent c. 1050–1000Ma detrital zircon age population from Damara–Congo strata is nearly absent from the Damara–Kalahari strata, even though orogenic events of this age are found on both cratons. Damara strata on the Kalahari margin also lack detrital zircons with U–Pb ages of 900–600Ma. The differences in detrital zircon age distributions are robust when comparing strata of the same age on both cratons, and remains so, even when younger, deeper water facies are excluded, which could have been biased by other sediment sources. These data suggest that the Congo and Kalahari cratons were not proximal in Rodinia, and did not establish their current relative positions until the end of the Neoproterozoic when they were sutured together during the collisional orogenies that formed Gondwana. Goscombe, Ben D. oth Newstead, Brittany oth Mapani, Ben oth Mueller, Paul A. oth Gregory, Laura C. oth Muvangua, Ewereth oth Enthalten in Elsevier Editorial Board 2016 international geoscience journal : official journal of the International Association for Gondwana Research Amsterdam [u.a.] (DE-627)ELV014379600 volume:28 year:2015 number:1 pages:179-190 extent:12 https://doi.org/10.1016/j.gr.2014.04.011 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_40 GBV_ILN_2001 GBV_ILN_2010 GBV_ILN_2014 GBV_ILN_2015 AR 28 2015 1 179-190 12 045F 550 |
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10.1016/j.gr.2014.04.011 doi GBVA2015019000007.pica (DE-627)ELV02924899X (ELSEVIER)S1342-937X(14)00176-2 DE-627 ger DE-627 rakwb eng 550 550 DE-600 530 VZ 620 VZ Foster, David A. verfasserin aut U–Pb age and Lu–Hf isotopic data of detrital zircons from the Neoproterozoic Damara Sequence: Implications for Congo and Kalahari before Gondwana 2015transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zircon U–Pb age distributions that correspond to the ages of prominent crustal components within the respective cratons. The most abundant zircons from Neoproterozoic strata deposited on the Congo margin give ages of 1150–1000 and 800–600Ma, whereas, the most abundant zircons from the Kalahari margin strata range from 1350 to 1100Ma. A 1350–1200Ma detrital zircon population in the Kalahari margin strata is absent in the Damara–Congo strata. A prominent c. 1050–1000Ma detrital zircon age population from Damara–Congo strata is nearly absent from the Damara–Kalahari strata, even though orogenic events of this age are found on both cratons. Damara strata on the Kalahari margin also lack detrital zircons with U–Pb ages of 900–600Ma. The differences in detrital zircon age distributions are robust when comparing strata of the same age on both cratons, and remains so, even when younger, deeper water facies are excluded, which could have been biased by other sediment sources. These data suggest that the Congo and Kalahari cratons were not proximal in Rodinia, and did not establish their current relative positions until the end of the Neoproterozoic when they were sutured together during the collisional orogenies that formed Gondwana. The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zircon U–Pb age distributions that correspond to the ages of prominent crustal components within the respective cratons. The most abundant zircons from Neoproterozoic strata deposited on the Congo margin give ages of 1150–1000 and 800–600Ma, whereas, the most abundant zircons from the Kalahari margin strata range from 1350 to 1100Ma. A 1350–1200Ma detrital zircon population in the Kalahari margin strata is absent in the Damara–Congo strata. A prominent c. 1050–1000Ma detrital zircon age population from Damara–Congo strata is nearly absent from the Damara–Kalahari strata, even though orogenic events of this age are found on both cratons. Damara strata on the Kalahari margin also lack detrital zircons with U–Pb ages of 900–600Ma. The differences in detrital zircon age distributions are robust when comparing strata of the same age on both cratons, and remains so, even when younger, deeper water facies are excluded, which could have been biased by other sediment sources. These data suggest that the Congo and Kalahari cratons were not proximal in Rodinia, and did not establish their current relative positions until the end of the Neoproterozoic when they were sutured together during the collisional orogenies that formed Gondwana. Goscombe, Ben D. oth Newstead, Brittany oth Mapani, Ben oth Mueller, Paul A. oth Gregory, Laura C. oth Muvangua, Ewereth oth Enthalten in Elsevier Editorial Board 2016 international geoscience journal : official journal of the International Association for Gondwana Research Amsterdam [u.a.] (DE-627)ELV014379600 volume:28 year:2015 number:1 pages:179-190 extent:12 https://doi.org/10.1016/j.gr.2014.04.011 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_40 GBV_ILN_2001 GBV_ILN_2010 GBV_ILN_2014 GBV_ILN_2015 AR 28 2015 1 179-190 12 045F 550 |
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u–pb age and lu–hf isotopic data of detrital zircons from the neoproterozoic damara sequence: implications for congo and kalahari before gondwana |
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U–Pb age and Lu–Hf isotopic data of detrital zircons from the Neoproterozoic Damara Sequence: Implications for Congo and Kalahari before Gondwana |
| abstract |
The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zircon U–Pb age distributions that correspond to the ages of prominent crustal components within the respective cratons. The most abundant zircons from Neoproterozoic strata deposited on the Congo margin give ages of 1150–1000 and 800–600Ma, whereas, the most abundant zircons from the Kalahari margin strata range from 1350 to 1100Ma. A 1350–1200Ma detrital zircon population in the Kalahari margin strata is absent in the Damara–Congo strata. A prominent c. 1050–1000Ma detrital zircon age population from Damara–Congo strata is nearly absent from the Damara–Kalahari strata, even though orogenic events of this age are found on both cratons. Damara strata on the Kalahari margin also lack detrital zircons with U–Pb ages of 900–600Ma. The differences in detrital zircon age distributions are robust when comparing strata of the same age on both cratons, and remains so, even when younger, deeper water facies are excluded, which could have been biased by other sediment sources. These data suggest that the Congo and Kalahari cratons were not proximal in Rodinia, and did not establish their current relative positions until the end of the Neoproterozoic when they were sutured together during the collisional orogenies that formed Gondwana. |
| abstractGer |
The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zircon U–Pb age distributions that correspond to the ages of prominent crustal components within the respective cratons. The most abundant zircons from Neoproterozoic strata deposited on the Congo margin give ages of 1150–1000 and 800–600Ma, whereas, the most abundant zircons from the Kalahari margin strata range from 1350 to 1100Ma. A 1350–1200Ma detrital zircon population in the Kalahari margin strata is absent in the Damara–Congo strata. A prominent c. 1050–1000Ma detrital zircon age population from Damara–Congo strata is nearly absent from the Damara–Kalahari strata, even though orogenic events of this age are found on both cratons. Damara strata on the Kalahari margin also lack detrital zircons with U–Pb ages of 900–600Ma. The differences in detrital zircon age distributions are robust when comparing strata of the same age on both cratons, and remains so, even when younger, deeper water facies are excluded, which could have been biased by other sediment sources. These data suggest that the Congo and Kalahari cratons were not proximal in Rodinia, and did not establish their current relative positions until the end of the Neoproterozoic when they were sutured together during the collisional orogenies that formed Gondwana. |
| abstract_unstemmed |
The proximity of the Congo and Kalahari cratons during the Neoproterozoic breakup of the supercontinent Rodinia and during subsequent assembly of Gondwana is unclear. Neoproterozoic metasedimentary rocks from the rifted margins of Congo and Kalahari in the Damara Orogen yield distinctive detrital zircon U–Pb age distributions that correspond to the ages of prominent crustal components within the respective cratons. The most abundant zircons from Neoproterozoic strata deposited on the Congo margin give ages of 1150–1000 and 800–600Ma, whereas, the most abundant zircons from the Kalahari margin strata range from 1350 to 1100Ma. A 1350–1200Ma detrital zircon population in the Kalahari margin strata is absent in the Damara–Congo strata. A prominent c. 1050–1000Ma detrital zircon age population from Damara–Congo strata is nearly absent from the Damara–Kalahari strata, even though orogenic events of this age are found on both cratons. Damara strata on the Kalahari margin also lack detrital zircons with U–Pb ages of 900–600Ma. The differences in detrital zircon age distributions are robust when comparing strata of the same age on both cratons, and remains so, even when younger, deeper water facies are excluded, which could have been biased by other sediment sources. These data suggest that the Congo and Kalahari cratons were not proximal in Rodinia, and did not establish their current relative positions until the end of the Neoproterozoic when they were sutured together during the collisional orogenies that formed Gondwana. |
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U–Pb age and Lu–Hf isotopic data of detrital zircons from the Neoproterozoic Damara Sequence: Implications for Congo and Kalahari before Gondwana |
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