Detrital-Zircon Geochronology of the Metasedimentary Rocks of North-Western Graham Land
Metasedimentary rocks constitute an important but comparatively poorly understood part of the Antarctic Peninsula. Herein we report single-grain U-Pb detrital-zircon ages from samples of the Trinity Peninsula and Botany Bay Groups of north-western Graham Land. All studied samples are dominated by a...
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ftunivsouthcar:oai:scholarcommons.sc.edu:geol_facpub-1061 2024-05-19T07:30:12+00:00 Detrital-Zircon Geochronology of the Metasedimentary Rocks of North-Western Graham Land Barbeau, David L, Jr Davis, Justin T Murray, Kendra E Valencia, Victor Gehrels, George E Zahid, Khandaker M Gombosi, David J 2009-01-01T08:00:00Z application/pdf https://scholarcommons.sc.edu/geol_facpub/62 https://scholarcommons.sc.edu/context/geol_facpub/article/1061/viewcontent/barbeau__antarctic.pdf unknown Scholar Commons https://scholarcommons.sc.edu/geol_facpub/62 https://scholarcommons.sc.edu/context/geol_facpub/article/1061/viewcontent/barbeau__antarctic.pdf Barbeau Jr., D. L., Davis, J. T., Murray, K. E., Valencia, V., Gehrels, G. E., Zahid, K. M., & Gombosi, D. J. (2009). Detrital-zircon geochronology of the metasedimentary rocks of north-western Graham Land. Antarctic Science, 22 , 65-78. © Antarctic Science 2009, Cambridge University Press Faculty Publications Botany Bay Group Gondwana Mount Flora Formation sediment provenance Trinity Peninsula Group Earth Sciences text 2009 ftunivsouthcar 2024-04-30T23:59:54Z Metasedimentary rocks constitute an important but comparatively poorly understood part of the Antarctic Peninsula. Herein we report single-grain U-Pb detrital-zircon ages from samples of the Trinity Peninsula and Botany Bay Groups of north-western Graham Land. All studied samples are dominated by a large and narrowly defined population of late Palaeozoic zircons. Significant early–middle Palaeozoic and minor Neoproterozoic and Mesoproterozoic sub-populations constitute the majority of pre-Carboniferous grains. These detrital-zircon age populations are consistent with sediment derivation entirely from western Gondwana sources. Despite the clear Gondwana signatures, our data suggest that the Trinity Peninsula Group province was either a parautochthonous peri-Gondwanan terrane later accreted to the Antarctic Peninsula, or a significant topographic barrier precluded voluminous sediment contributions from the interior of Gondwana. Statistical comparisons with similar metasedimentary complexes of southern South America, the South Shetland Islands and eastern New Zealand indicate a diversity of sediment provenance not previously recognized, but may provide a means to better determine the pre-break-up configuration of western Gondwana. Although insufficient to definitively restore Antarctic Peninsula components adjacent to South American complexes, some Trinity Peninsula Group samples exhibit robust affinities to the Miers Bluff Formation in the South Shetland Islands and the Duque de York and Main Range Metamorphic Complexes of the Patagonian Andes. Text Antarc* Antarctic Antarctic Peninsula Graham Land South Shetland Islands University of South Carolina Libraries: Scholar Commons |
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University of South Carolina Libraries: Scholar Commons |
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ftunivsouthcar |
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unknown |
topic |
Botany Bay Group Gondwana Mount Flora Formation sediment provenance Trinity Peninsula Group Earth Sciences |
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Botany Bay Group Gondwana Mount Flora Formation sediment provenance Trinity Peninsula Group Earth Sciences Barbeau, David L, Jr Davis, Justin T Murray, Kendra E Valencia, Victor Gehrels, George E Zahid, Khandaker M Gombosi, David J Detrital-Zircon Geochronology of the Metasedimentary Rocks of North-Western Graham Land |
topic_facet |
Botany Bay Group Gondwana Mount Flora Formation sediment provenance Trinity Peninsula Group Earth Sciences |
description |
Metasedimentary rocks constitute an important but comparatively poorly understood part of the Antarctic Peninsula. Herein we report single-grain U-Pb detrital-zircon ages from samples of the Trinity Peninsula and Botany Bay Groups of north-western Graham Land. All studied samples are dominated by a large and narrowly defined population of late Palaeozoic zircons. Significant early–middle Palaeozoic and minor Neoproterozoic and Mesoproterozoic sub-populations constitute the majority of pre-Carboniferous grains. These detrital-zircon age populations are consistent with sediment derivation entirely from western Gondwana sources. Despite the clear Gondwana signatures, our data suggest that the Trinity Peninsula Group province was either a parautochthonous peri-Gondwanan terrane later accreted to the Antarctic Peninsula, or a significant topographic barrier precluded voluminous sediment contributions from the interior of Gondwana. Statistical comparisons with similar metasedimentary complexes of southern South America, the South Shetland Islands and eastern New Zealand indicate a diversity of sediment provenance not previously recognized, but may provide a means to better determine the pre-break-up configuration of western Gondwana. Although insufficient to definitively restore Antarctic Peninsula components adjacent to South American complexes, some Trinity Peninsula Group samples exhibit robust affinities to the Miers Bluff Formation in the South Shetland Islands and the Duque de York and Main Range Metamorphic Complexes of the Patagonian Andes. |
format |
Text |
author |
Barbeau, David L, Jr Davis, Justin T Murray, Kendra E Valencia, Victor Gehrels, George E Zahid, Khandaker M Gombosi, David J |
author_facet |
Barbeau, David L, Jr Davis, Justin T Murray, Kendra E Valencia, Victor Gehrels, George E Zahid, Khandaker M Gombosi, David J |
author_sort |
Barbeau, David L, Jr |
title |
Detrital-Zircon Geochronology of the Metasedimentary Rocks of North-Western Graham Land |
title_short |
Detrital-Zircon Geochronology of the Metasedimentary Rocks of North-Western Graham Land |
title_full |
Detrital-Zircon Geochronology of the Metasedimentary Rocks of North-Western Graham Land |
title_fullStr |
Detrital-Zircon Geochronology of the Metasedimentary Rocks of North-Western Graham Land |
title_full_unstemmed |
Detrital-Zircon Geochronology of the Metasedimentary Rocks of North-Western Graham Land |
title_sort |
detrital-zircon geochronology of the metasedimentary rocks of north-western graham land |
publisher |
Scholar Commons |
publishDate |
2009 |
url |
https://scholarcommons.sc.edu/geol_facpub/62 https://scholarcommons.sc.edu/context/geol_facpub/article/1061/viewcontent/barbeau__antarctic.pdf |
genre |
Antarc* Antarctic Antarctic Peninsula Graham Land South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Graham Land South Shetland Islands |
op_source |
Faculty Publications |
op_relation |
https://scholarcommons.sc.edu/geol_facpub/62 https://scholarcommons.sc.edu/context/geol_facpub/article/1061/viewcontent/barbeau__antarctic.pdf |
op_rights |
Barbeau Jr., D. L., Davis, J. T., Murray, K. E., Valencia, V., Gehrels, G. E., Zahid, K. M., & Gombosi, D. J. (2009). Detrital-zircon geochronology of the metasedimentary rocks of north-western Graham Land. Antarctic Science, 22 , 65-78. © Antarctic Science 2009, Cambridge University Press |
_version_ |
1799484493096026112 |