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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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/68119 2023-05-15T13:56:44+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, Christopher Herve, Francisco Pankhurst, Robert J Rapela, Carlos W Kleiman, Laura E. Yaxley, Gregory Castillo, Paula 2015-12-10T23:27:13Z http://hdl.handle.net/1885/68119 unknown Pergamon-Elsevier Ltd 0895-9811 http://hdl.handle.net/1885/68119 Journal of South American Earth Sciences Journal article 2015 ftanucanberra 2015-12-21T23:44:36Z 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contains abundant Permian rhyolites that crop out on the eastern side of the Andes in central Argentina, for which unpublished Hf isotope data yield a very similar range to that of the metasediments.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 but significant subduction-related magmatic input, is an isotopically feasible explanation and is broadly consistent with the provenance of pre-Permian crust in this region, but the proportions of such a mixture must have remained relatively constant. This supports the proposal that recently recognised but widespread Permian magmatism in Patagonia represents voluminous crustal melting in response to subducted slab break-off. The results are also consistent with the premise that the Antarctic Peninsula and southern Patagonia were closely located from Permian to Jurassic times, receiving detritus from the same source. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Australian National University: ANU Digital Collections Antarctic Antarctic Peninsula Argentina Patagonia The Antarctic |
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Open Polar |
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Australian National University: ANU Digital Collections |
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ftanucanberra |
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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 but significant subduction-related magmatic input, is an isotopically feasible explanation and is broadly consistent with the provenance of pre-Permian crust in this region, but the proportions of such a mixture must have remained relatively constant. This supports the proposal that recently recognised but widespread Permian magmatism in Patagonia represents voluminous crustal melting in response to subducted slab break-off. The results are also consistent with the premise that the Antarctic Peninsula and southern Patagonia were closely located from Permian to Jurassic times, receiving detritus from the same source. |
format |
Article in Journal/Newspaper |
author |
Fanning, Christopher Herve, Francisco Pankhurst, Robert J Rapela, Carlos W Kleiman, Laura E. Yaxley, Gregory Castillo, Paula |
spellingShingle |
Fanning, Christopher Herve, Francisco Pankhurst, Robert J Rapela, Carlos W Kleiman, Laura E. Yaxley, Gregory 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, Christopher Herve, Francisco Pankhurst, Robert J Rapela, Carlos W Kleiman, Laura E. Yaxley, Gregory Castillo, Paula |
author_sort |
Fanning, Christopher |
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 |
Pergamon-Elsevier Ltd |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/68119 |
geographic |
Antarctic Antarctic Peninsula Argentina Patagonia The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Argentina Patagonia The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_source |
Journal of South American Earth Sciences |
op_relation |
0895-9811 http://hdl.handle.net/1885/68119 |
_version_ |
1766264313827295232 |