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 measurement 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...
Main Authors: | , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Geological Society of London
2015
|
Subjects: | |
Online Access: | http://hdl.handle.net/1885/17174 |
id |
ftanucanberra:oai:digitalcollections.anu.edu.au:1885/17174 |
---|---|
record_format |
openpolar |
spelling |
ftanucanberra:oai:digitalcollections.anu.edu.au:1885/17174 2023-05-15T13:38:43+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 Augustsson, Carita Muenker, Carsten Bahlburg, Heinrich Fanning, Christopher 2015-12-07T22:13:51Z http://hdl.handle.net/1885/17174 unknown Geological Society of London 0016-7649 http://hdl.handle.net/1885/17174 Journal of the Geological Society Keywords: Carboniferous detrital deposit Gondwana isotopic composition metasediment provenance uranium-lead dating zircon Patagonia South America Journal article 2015 ftanucanberra 2015-12-21T23:17:57Z Combined U-Pb and Lu-Hf isotope measurement 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. Article in Journal/Newspaper Antarc* Antarctica East Antarctica West Antarctica Australian National University: ANU Digital Collections Argentina Argentine East Antarctica Pacific Patagonia West Antarctica |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Keywords: Carboniferous detrital deposit Gondwana isotopic composition metasediment provenance uranium-lead dating zircon Patagonia South America |
spellingShingle |
Keywords: Carboniferous detrital deposit Gondwana isotopic composition metasediment provenance uranium-lead dating zircon Patagonia South America Augustsson, Carita Muenker, Carsten Bahlburg, Heinrich Fanning, Christopher 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 |
Keywords: Carboniferous detrital deposit Gondwana isotopic composition metasediment provenance uranium-lead dating zircon Patagonia South America |
description |
Combined U-Pb and Lu-Hf isotope measurement 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 |
Article in Journal/Newspaper |
author |
Augustsson, Carita Muenker, Carsten Bahlburg, Heinrich Fanning, Christopher |
author_facet |
Augustsson, Carita Muenker, Carsten Bahlburg, Heinrich Fanning, Christopher |
author_sort |
Augustsson, Carita |
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 |
publisher |
Geological Society of London |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/17174 |
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 |
Journal of the Geological Society |
op_relation |
0016-7649 http://hdl.handle.net/1885/17174 |
_version_ |
1766110386342330368 |