Lu-Hf isotope evidence for the provenance of Permian detritus in accretionary complexes of western Patagonia and the northern Antarctic Peninsula region
Lu–Hf isotope data are presented for dated Permian zircon grains from six samples of the latest Palaeozoic to Jurassic low-grade metasedimentary rocks of western Patagonia and the northern Antarctic Peninsula, as well as from potential source rocks in the North Patagonian Massif. The results for the...
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ftnerc:oai:nora.nerc.ac.uk:17955 2023-05-15T13:45:12+02:00 Lu-Hf isotope evidence for the provenance of Permian detritus in accretionary complexes of western Patagonia and the northern Antarctic Peninsula region Fanning, C. Mark Herve, Francisco Pankhurst, Robert J. Rapela, Carlos W. Kleiman, Laura E. Yaxley, Greg M. Castillo, Paula 2011 http://nora.nerc.ac.uk/id/eprint/17955/ http://www.sciencedirect.com/science/journal/08959811 unknown Elsevier Fanning, C. Mark; Herve, Francisco; Pankhurst, Robert J.; Rapela, Carlos W.; Kleiman, Laura E.; Yaxley, Greg M.; Castillo, Paula. 2011 Lu-Hf isotope evidence for the provenance of Permian detritus in accretionary complexes of western Patagonia and the northern Antarctic Peninsula region. Journal of South American Earth Sciences, 32 (4). 485-496. https://doi.org/10.1016/j.jsames.2011.03.007 <https://doi.org/10.1016/j.jsames.2011.03.007> Publication - Article PeerReviewed 2011 ftnerc https://doi.org/10.1016/j.jsames.2011.03.007 2023-02-04T19:31:25Z Lu–Hf isotope data are presented for dated Permian zircon grains from six samples of the latest Palaeozoic to Jurassic low-grade metasedimentary rocks of western Patagonia and the northern Antarctic Peninsula, as well as from potential source rocks in the North Patagonian Massif. The results for the metasedimentary rocks yield εHf values mostly between −15 and +4 (130 analyses), with a dominant range (more than 85%) of −6 to +1, indicating provenance from Permian magmatic rocks that incorporated continental crust with a significant residence time. Other zircon grains record more negative εHf values indicating derivation from yet more mature crustal sources. Permian subvolcanic granites in the North Patagonian massif appear to be the closest large source area and dated zircon grains from eight samples of these granites yield initial of εHf values of −12 to +4 (45 measurements), 84% of which fall between −6 and +1, the range shown by the metasediments. However, the North Patagonian massif also contains some more juvenile Permian–Carboniferous components not seen in the metasediments, so that this may not be the primary or unique source. These granites are considered to represent the southernmost extension of the Choiyoi igneous province, which contains abundant Permian rhyolites that crop out on the eastern side of the Andes in central Argentina, for which unpublished Hf isotope data yield a very similar range to that of the metasediments. The widespread nature of the Choiyoi volcanic rocks and the predominance of Permian zircon could make this a more favoured source for the detrital grains. Hf isotope data reinforce the uniformity of the provenance of the turbidite detrital zircons and confirm the Choiyoi igneous province and the Permian granitic rocks of the North Patagonian Massif as feasible sources. They further confirm the dominantly crustal origin of the Permian magmas. A source region involving mixing of, for example, crustal materials of Panafrican/Brasiliano and Grenvillian ages, together with a minor ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula Patagonia Argentina Journal of South American Earth Sciences 32 4 485 496 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
Lu–Hf isotope data are presented for dated Permian zircon grains from six samples of the latest Palaeozoic to Jurassic low-grade metasedimentary rocks of western Patagonia and the northern Antarctic Peninsula, as well as from potential source rocks in the North Patagonian Massif. The results for the metasedimentary rocks yield εHf values mostly between −15 and +4 (130 analyses), with a dominant range (more than 85%) of −6 to +1, indicating provenance from Permian magmatic rocks that incorporated continental crust with a significant residence time. Other zircon grains record more negative εHf values indicating derivation from yet more mature crustal sources. Permian subvolcanic granites in the North Patagonian massif appear to be the closest large source area and dated zircon grains from eight samples of these granites yield initial of εHf values of −12 to +4 (45 measurements), 84% of which fall between −6 and +1, the range shown by the metasediments. However, the North Patagonian massif also contains some more juvenile Permian–Carboniferous components not seen in the metasediments, so that this may not be the primary or unique source. These granites are considered to represent the southernmost extension of the Choiyoi igneous province, which contains abundant Permian rhyolites that crop out on the eastern side of the Andes in central Argentina, for which unpublished Hf isotope data yield a very similar range to that of the metasediments. The widespread nature of the Choiyoi volcanic rocks and the predominance of Permian zircon could make this a more favoured source for the detrital grains. Hf isotope data reinforce the uniformity of the provenance of the turbidite detrital zircons and confirm the Choiyoi igneous province and the Permian granitic rocks of the North Patagonian Massif as feasible sources. They further confirm the dominantly crustal origin of the Permian magmas. A source region involving mixing of, for example, crustal materials of Panafrican/Brasiliano and Grenvillian ages, together with a minor ... |
format |
Article in Journal/Newspaper |
author |
Fanning, C. Mark Herve, Francisco Pankhurst, Robert J. Rapela, Carlos W. Kleiman, Laura E. Yaxley, Greg M. Castillo, Paula |
spellingShingle |
Fanning, C. Mark Herve, Francisco Pankhurst, Robert J. Rapela, Carlos W. Kleiman, Laura E. Yaxley, Greg M. Castillo, Paula Lu-Hf isotope evidence for the provenance of Permian detritus in accretionary complexes of western Patagonia and the northern Antarctic Peninsula region |
author_facet |
Fanning, C. Mark Herve, Francisco Pankhurst, Robert J. Rapela, Carlos W. Kleiman, Laura E. Yaxley, Greg M. Castillo, Paula |
author_sort |
Fanning, C. Mark |
title |
Lu-Hf isotope evidence for the provenance of Permian detritus in accretionary complexes of western Patagonia and the northern Antarctic Peninsula region |
title_short |
Lu-Hf isotope evidence for the provenance of Permian detritus in accretionary complexes of western Patagonia and the northern Antarctic Peninsula region |
title_full |
Lu-Hf isotope evidence for the provenance of Permian detritus in accretionary complexes of western Patagonia and the northern Antarctic Peninsula region |
title_fullStr |
Lu-Hf isotope evidence for the provenance of Permian detritus in accretionary complexes of western Patagonia and the northern Antarctic Peninsula region |
title_full_unstemmed |
Lu-Hf isotope evidence for the provenance of Permian detritus in accretionary complexes of western Patagonia and the northern Antarctic Peninsula region |
title_sort |
lu-hf isotope evidence for the provenance of permian detritus in accretionary complexes of western patagonia and the northern antarctic peninsula region |
publisher |
Elsevier |
publishDate |
2011 |
url |
http://nora.nerc.ac.uk/id/eprint/17955/ http://www.sciencedirect.com/science/journal/08959811 |
geographic |
Antarctic Antarctic Peninsula Patagonia Argentina |
geographic_facet |
Antarctic Antarctic Peninsula Patagonia Argentina |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_relation |
Fanning, C. Mark; Herve, Francisco; Pankhurst, Robert J.; Rapela, Carlos W.; Kleiman, Laura E.; Yaxley, Greg M.; Castillo, Paula. 2011 Lu-Hf isotope evidence for the provenance of Permian detritus in accretionary complexes of western Patagonia and the northern Antarctic Peninsula region. Journal of South American Earth Sciences, 32 (4). 485-496. https://doi.org/10.1016/j.jsames.2011.03.007 <https://doi.org/10.1016/j.jsames.2011.03.007> |
op_doi |
https://doi.org/10.1016/j.jsames.2011.03.007 |
container_title |
Journal of South American Earth Sciences |
container_volume |
32 |
container_issue |
4 |
container_start_page |
485 |
op_container_end_page |
496 |
_version_ |
1766216518013550592 |