Provenance of late Palaeozoic metasediments of the SW South American Gondwana margin: a combined U–Pb and Hf-isotope study of single detrital zircons
Abstract: 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...
Main Authors: | , , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.503.2615 http://www.uni-muenster.de/GeoPalaeontologie/Geologie/Sedi/pdf/Augustsson+et+al_2006_Provenance+of+Late+Palaeozoic+metasediments+of+the+SW+South+American+Gondwana+margin+from+combined+U-Pb+ages+and+Hf+isotope.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.503.2615 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.503.2615 2023-05-15T13:52:23+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 Heinrich Bahlburg C. Mark Fanning The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.503.2615 http://www.uni-muenster.de/GeoPalaeontologie/Geologie/Sedi/pdf/Augustsson+et+al_2006_Provenance+of+Late+Palaeozoic+metasediments+of+the+SW+South+American+Gondwana+margin+from+combined+U-Pb+ages+and+Hf+isotope.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.503.2615 http://www.uni-muenster.de/GeoPalaeontologie/Geologie/Sedi/pdf/Augustsson+et+al_2006_Provenance+of+Late+Palaeozoic+metasediments+of+the+SW+South+American+Gondwana+margin+from+combined+U-Pb+ages+and+Hf+isotope.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.uni-muenster.de/GeoPalaeontologie/Geologie/Sedi/pdf/Augustsson+et+al_2006_Provenance+of+Late+Palaeozoic+metasediments+of+the+SW+South+American+Gondwana+margin+from+combined+U-Pb+ages+and+Hf+isotope.pdf text ftciteseerx 2016-01-08T09:14:31Z Abstract: 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 (Hf(T0:4–3:5Ga) 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. The initial Hf-isotope composition of single detrital zircon grains Text Antarc* Antarctica East Antarctica West Antarctica Unknown Argentina Argentine East Antarctica Pacific Patagonia West Antarctica |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
Abstract: 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 (Hf(T0:4–3:5Ga) 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. The initial Hf-isotope composition of single detrital zircon grains |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Carita Augustsson Heinrich Bahlburg C. Mark Fanning |
spellingShingle |
Carita Augustsson 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 |
author_facet |
Carita Augustsson 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 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.503.2615 http://www.uni-muenster.de/GeoPalaeontologie/Geologie/Sedi/pdf/Augustsson+et+al_2006_Provenance+of+Late+Palaeozoic+metasediments+of+the+SW+South+American+Gondwana+margin+from+combined+U-Pb+ages+and+Hf+isotope.pdf |
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_source |
http://www.uni-muenster.de/GeoPalaeontologie/Geologie/Sedi/pdf/Augustsson+et+al_2006_Provenance+of+Late+Palaeozoic+metasediments+of+the+SW+South+American+Gondwana+margin+from+combined+U-Pb+ages+and+Hf+isotope.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.503.2615 http://www.uni-muenster.de/GeoPalaeontologie/Geologie/Sedi/pdf/Augustsson+et+al_2006_Provenance+of+Late+Palaeozoic+metasediments+of+the+SW+South+American+Gondwana+margin+from+combined+U-Pb+ages+and+Hf+isotope.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766256659610468352 |