Mesoproterozoic and Paleoproterozoic subcontinental lithospheric mantle domains beneath southern Patagonia: Isotopic evidence for its connection to Africa and Antarctica
New isotopic studies on mantle xenoliths from Santa Cruz Province, southern Patagonia, Argentina, reveal that at least three discrete subcontinental lithospheric mantle (SCLM) domains—the Deseado Massif, Tres Lagos, and Pali Aike—form the southernmost part of South America. Re-Os systematics yield e...
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ftczacademyscien:oai:asep.lib.cas.cz:CavUnEpca/0438962 2024-09-15T17:42:26+00:00 Mesoproterozoic and Paleoproterozoic subcontinental lithospheric mantle domains beneath southern Patagonia: Isotopic evidence for its connection to Africa and Antarctica Mundl, A. Ntaflos, T. Ackerman, L. (Lukáš) Bizimis, M. Bjerg, E. A. Hauzenberger, Ch. A. 2015 https://doi.org/10.1130/G36344.1 http://hdl.handle.net/11104/0242311 eng eng doi:10.1130/G36344.1 urn:pissn: 0091-7613 urn:eissn: 1943-2682 http://hdl.handle.net/11104/0242311 lithospheric mantle Mesoproterozoic Paleoproterozoic info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2015 ftczacademyscien https://doi.org/10.1130/G36344.1 2024-08-19T05:32:59Z New isotopic studies on mantle xenoliths from Santa Cruz Province, southern Patagonia, Argentina, reveal that at least three discrete subcontinental lithospheric mantle (SCLM) domains—the Deseado Massif, Tres Lagos, and Pali Aike—form the southernmost part of South America. Re-Os systematics yield early Paleoproterozoic (up to 2.5 Ga) SCLM formation ages (rhenium depletion ages, TRD) for Pali Aike spinel peridotites, while samples from the Deseado Massif and Tres Lagos indicate a younger SCLM origin with Neoproterozoic to Mesoproterozoic (0.9–1.3 Ga) and Mesoproterozoic to late Paleoproterozoic (1.3–1.9 Ga) TRD ages, respectively. Hf-Sr-Nd isotopic compositions indicate metasomatic overprinting of the majority of the samples, which, however, has not affected the Os isotopic system. Based on similar formation ages, the geological evolution of the Deseado Massif is most likely connected to the evolution of the Namaqua-Natal belt of South Africa. TRD ages from SCLM domains underneath Tres Lagos and Pali Aike indicate a common origin with crustal sections from Shackleton Range, Antarctica, positioning the southern tip of South America closer to west Antarctica in the reconstructed Rodinia supercontinent than previously assumed. Article in Journal/Newspaper Antarc* Antarctica West Antarctica The Czech Academy of Sciences: Publication Activity (ASEP) Geology 43 1 39 42 |
institution |
Open Polar |
collection |
The Czech Academy of Sciences: Publication Activity (ASEP) |
op_collection_id |
ftczacademyscien |
language |
English |
topic |
lithospheric mantle Mesoproterozoic Paleoproterozoic |
spellingShingle |
lithospheric mantle Mesoproterozoic Paleoproterozoic Mundl, A. Ntaflos, T. Ackerman, L. (Lukáš) Bizimis, M. Bjerg, E. A. Hauzenberger, Ch. A. Mesoproterozoic and Paleoproterozoic subcontinental lithospheric mantle domains beneath southern Patagonia: Isotopic evidence for its connection to Africa and Antarctica |
topic_facet |
lithospheric mantle Mesoproterozoic Paleoproterozoic |
description |
New isotopic studies on mantle xenoliths from Santa Cruz Province, southern Patagonia, Argentina, reveal that at least three discrete subcontinental lithospheric mantle (SCLM) domains—the Deseado Massif, Tres Lagos, and Pali Aike—form the southernmost part of South America. Re-Os systematics yield early Paleoproterozoic (up to 2.5 Ga) SCLM formation ages (rhenium depletion ages, TRD) for Pali Aike spinel peridotites, while samples from the Deseado Massif and Tres Lagos indicate a younger SCLM origin with Neoproterozoic to Mesoproterozoic (0.9–1.3 Ga) and Mesoproterozoic to late Paleoproterozoic (1.3–1.9 Ga) TRD ages, respectively. Hf-Sr-Nd isotopic compositions indicate metasomatic overprinting of the majority of the samples, which, however, has not affected the Os isotopic system. Based on similar formation ages, the geological evolution of the Deseado Massif is most likely connected to the evolution of the Namaqua-Natal belt of South Africa. TRD ages from SCLM domains underneath Tres Lagos and Pali Aike indicate a common origin with crustal sections from Shackleton Range, Antarctica, positioning the southern tip of South America closer to west Antarctica in the reconstructed Rodinia supercontinent than previously assumed. |
format |
Article in Journal/Newspaper |
author |
Mundl, A. Ntaflos, T. Ackerman, L. (Lukáš) Bizimis, M. Bjerg, E. A. Hauzenberger, Ch. A. |
author_facet |
Mundl, A. Ntaflos, T. Ackerman, L. (Lukáš) Bizimis, M. Bjerg, E. A. Hauzenberger, Ch. A. |
author_sort |
Mundl, A. |
title |
Mesoproterozoic and Paleoproterozoic subcontinental lithospheric mantle domains beneath southern Patagonia: Isotopic evidence for its connection to Africa and Antarctica |
title_short |
Mesoproterozoic and Paleoproterozoic subcontinental lithospheric mantle domains beneath southern Patagonia: Isotopic evidence for its connection to Africa and Antarctica |
title_full |
Mesoproterozoic and Paleoproterozoic subcontinental lithospheric mantle domains beneath southern Patagonia: Isotopic evidence for its connection to Africa and Antarctica |
title_fullStr |
Mesoproterozoic and Paleoproterozoic subcontinental lithospheric mantle domains beneath southern Patagonia: Isotopic evidence for its connection to Africa and Antarctica |
title_full_unstemmed |
Mesoproterozoic and Paleoproterozoic subcontinental lithospheric mantle domains beneath southern Patagonia: Isotopic evidence for its connection to Africa and Antarctica |
title_sort |
mesoproterozoic and paleoproterozoic subcontinental lithospheric mantle domains beneath southern patagonia: isotopic evidence for its connection to africa and antarctica |
publishDate |
2015 |
url |
https://doi.org/10.1130/G36344.1 http://hdl.handle.net/11104/0242311 |
genre |
Antarc* Antarctica West Antarctica |
genre_facet |
Antarc* Antarctica West Antarctica |
op_relation |
doi:10.1130/G36344.1 urn:pissn: 0091-7613 urn:eissn: 1943-2682 http://hdl.handle.net/11104/0242311 |
op_doi |
https://doi.org/10.1130/G36344.1 |
container_title |
Geology |
container_volume |
43 |
container_issue |
1 |
container_start_page |
39 |
op_container_end_page |
42 |
_version_ |
1810489009100554240 |