Provenance of late Palaeozoic metasediments of the SW South American Gondwana margin: a combined U–Pb and Hf-isotope study of single detrital zircons
Combined U–Pb and Lu–Hf isotope measurements of single detrital zircon grains in Carboniferous metasediments from Patagonia delineate the source areas of the sediments. The detritus, represented by four metasandstone samples, was deposited prior to onset of subduction in Late Carboniferous time alon...
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ftgeosoclonfig:oai:figshare.com:article/3454355 2023-05-15T13:33:00+02:00 Provenance of late Palaeozoic metasediments of the SW South American Gondwana margin: a combined U–Pb and Hf-isotope study of single detrital zircons CARITA AUGUSTSSON CARSTEN MÜNKER HEINRICH BAHLBURG C.MARK FANNING 2016-06-21T12:04:15Z https://doi.org/10.6084/m9.figshare.3454355.v1 https://figshare.com/articles/Provenance_of_late_Palaeozoic_metasediments_of_the_SW_South_American_Gondwana_margin_a_combined_U_Pb_and_Hf-isotope_study___of_single_detrital_zircons/3454355 unknown doi:10.6084/m9.figshare.3454355.v1 https://figshare.com/articles/Provenance_of_late_Palaeozoic_metasediments_of_the_SW_South_American_Gondwana_margin_a_combined_U_Pb_and_Hf-isotope_study___of_single_detrital_zircons/3454355 CC BY 4.0 CC-BY Geology Carboniferous time source areas Patagonia Ga Ma autochthonous palaeogeographical position subduction SW South American Gondwana margin sample detrital zircon grains onset Carboniferous metasediments sediment transportation paths detritu Dataset 2016 ftgeosoclonfig https://doi.org/10.6084/m9.figshare.3454355.v1 2020-02-21T07:23:35Z Combined U–Pb and Lu–Hf isotope measurements of single detrital zircon grains in Carboniferous metasediments from Patagonia delineate the source areas of the sediments. The detritus, represented by four metasandstone samples, was deposited prior to onset of subduction in Late Carboniferous time along the south Patagonian proto-Pacific Gondwana margin. A broad series of detrital zircon age peaks (0.35–0.7 Ga, 0.9–1.5 Ga) and a large spread (0.3–3.5 Ga) in the age spectra require numerous sources. A fifth metasediment was deposited after the onset of subduction. This syncollisional sample shows two distinct U–Pb age peaks at c . 290 Ma and 305 Ma. This points to a few sources only (Patagonia, West Antarctica). Initial Hf-isotope compositions of selected U–Pb dated zircons from the Carboniferous metasediments reveal zircon protoliths originating from both recycled crust and juvenile sources (εHf (T=0.4–3.5Ga) =−14 to +12). A comparison with crustal compositions of possible source areas indicates that the detritus mainly originated from the interior of Gondwana (Extra-Andean Patagonia, the Argentine Sierra de la Ventana, southernmost Africa, East Antarctica), as well as northern Chile and northwestern Argentina. The sediment transportation paths are consistent with an autochthonous palaeogeographical position of Patagonia with respect to Gondwana in Carboniferous time. Dataset Antarc* Antarctica East Antarctica West Antarctica Geological Society of London: Figshare Argentina Argentine East Antarctica Pacific Patagonia West Antarctica |
institution |
Open Polar |
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Geological Society of London: Figshare |
op_collection_id |
ftgeosoclonfig |
language |
unknown |
topic |
Geology Carboniferous time source areas Patagonia Ga Ma autochthonous palaeogeographical position subduction SW South American Gondwana margin sample detrital zircon grains onset Carboniferous metasediments sediment transportation paths detritu |
spellingShingle |
Geology Carboniferous time source areas Patagonia Ga Ma autochthonous palaeogeographical position subduction SW South American Gondwana margin sample detrital zircon grains onset Carboniferous metasediments sediment transportation paths detritu CARITA AUGUSTSSON CARSTEN MÜNKER HEINRICH BAHLBURG C.MARK FANNING Provenance of late Palaeozoic metasediments of the SW South American Gondwana margin: a combined U–Pb and Hf-isotope study of single detrital zircons |
topic_facet |
Geology Carboniferous time source areas Patagonia Ga Ma autochthonous palaeogeographical position subduction SW South American Gondwana margin sample detrital zircon grains onset Carboniferous metasediments sediment transportation paths detritu |
description |
Combined U–Pb and Lu–Hf isotope measurements of single detrital zircon grains in Carboniferous metasediments from Patagonia delineate the source areas of the sediments. The detritus, represented by four metasandstone samples, was deposited prior to onset of subduction in Late Carboniferous time along the south Patagonian proto-Pacific Gondwana margin. A broad series of detrital zircon age peaks (0.35–0.7 Ga, 0.9–1.5 Ga) and a large spread (0.3–3.5 Ga) in the age spectra require numerous sources. A fifth metasediment was deposited after the onset of subduction. This syncollisional sample shows two distinct U–Pb age peaks at c . 290 Ma and 305 Ma. This points to a few sources only (Patagonia, West Antarctica). Initial Hf-isotope compositions of selected U–Pb dated zircons from the Carboniferous metasediments reveal zircon protoliths originating from both recycled crust and juvenile sources (εHf (T=0.4–3.5Ga) =−14 to +12). A comparison with crustal compositions of possible source areas indicates that the detritus mainly originated from the interior of Gondwana (Extra-Andean Patagonia, the Argentine Sierra de la Ventana, southernmost Africa, East Antarctica), as well as northern Chile and northwestern Argentina. The sediment transportation paths are consistent with an autochthonous palaeogeographical position of Patagonia with respect to Gondwana in Carboniferous time. |
format |
Dataset |
author |
CARITA AUGUSTSSON CARSTEN MÜNKER HEINRICH BAHLBURG C.MARK FANNING |
author_facet |
CARITA AUGUSTSSON CARSTEN MÜNKER HEINRICH BAHLBURG C.MARK FANNING |
author_sort |
CARITA AUGUSTSSON |
title |
Provenance of late Palaeozoic metasediments of the SW South American Gondwana margin: a combined U–Pb and Hf-isotope study of single detrital zircons |
title_short |
Provenance of late Palaeozoic metasediments of the SW South American Gondwana margin: a combined U–Pb and Hf-isotope study of single detrital zircons |
title_full |
Provenance of late Palaeozoic metasediments of the SW South American Gondwana margin: a combined U–Pb and Hf-isotope study of single detrital zircons |
title_fullStr |
Provenance of late Palaeozoic metasediments of the SW South American Gondwana margin: a combined U–Pb and Hf-isotope study of single detrital zircons |
title_full_unstemmed |
Provenance of late Palaeozoic metasediments of the SW South American Gondwana margin: a combined U–Pb and Hf-isotope study of single detrital zircons |
title_sort |
provenance of late palaeozoic metasediments of the sw south american gondwana margin: a combined u–pb and hf-isotope study of single detrital zircons |
publishDate |
2016 |
url |
https://doi.org/10.6084/m9.figshare.3454355.v1 https://figshare.com/articles/Provenance_of_late_Palaeozoic_metasediments_of_the_SW_South_American_Gondwana_margin_a_combined_U_Pb_and_Hf-isotope_study___of_single_detrital_zircons/3454355 |
geographic |
Argentina Argentine East Antarctica Pacific Patagonia West Antarctica |
geographic_facet |
Argentina Argentine East Antarctica Pacific Patagonia West Antarctica |
genre |
Antarc* Antarctica East Antarctica West Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica West Antarctica |
op_relation |
doi:10.6084/m9.figshare.3454355.v1 https://figshare.com/articles/Provenance_of_late_Palaeozoic_metasediments_of_the_SW_South_American_Gondwana_margin_a_combined_U_Pb_and_Hf-isotope_study___of_single_detrital_zircons/3454355 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.3454355.v1 |
_version_ |
1766037727684329472 |