Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology
New sensitive high-resolution ion microprobe (SHRIMP) U-Pb detrital zircon ages from Cambrian to Permian-Carboniferous siliciclastic units in the Ellsworth Mountains constrain their provenance and maximum depositional age, as well as providing key information as to the tectonic evolution of a proble...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/203317 2024-01-14T10:01:28+01:00 Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology Castillo Gonzalez, Paula Fanning, Christopher Fernandez, Rodrigo Poblete, Fernando Hervé, Francisco application/pdf http://hdl.handle.net/1885/203317 https://doi.org/10.1130/B31686.1 https://openresearch-repository.anu.edu.au/bitstream/1885/203317/5/01_Castillo%2bGonzalez_Provenance_and_age_constraints_2017.pdf.jpg en_AU eng Association of Engineering Geologists 0016-7606 http://hdl.handle.net/1885/203317 doi:10.1130/B31686.1 https://openresearch-repository.anu.edu.au/bitstream/1885/203317/5/01_Castillo%2bGonzalez_Provenance_and_age_constraints_2017.pdf.jpg © 2017 Geological Society of America Geological Society of America Bulletin Journal article ftanucanberra https://doi.org/10.1130/B31686.1 2023-12-15T09:35:14Z New sensitive high-resolution ion microprobe (SHRIMP) U-Pb detrital zircon ages from Cambrian to Permian-Carboniferous siliciclastic units in the Ellsworth Mountains constrain their provenance and maximum depositional age, as well as providing key information as to the tectonic evolution of a problematic region. The Cambrian Heritage Group was deposited in an active continental rift setting and has main zircon components of late Mesoproterozoic-early Neoproterozoic age (ca. 1300-900 Ma) with little to no contributions from older cratons. Two meta-volcaniclastic samples of the Union Glacier Formation (lower Heritage Group) have U-Pb zircon ages of ca. 675 Ma, indicating proximal Cryogenian volcanism and thereby raising questions as to the depositional age of this unit. Igneous and metamorphic zircons of late Neoproterozoic-early Cambrian age (650-530 Ma) are a secondary component present in the upper part of this group. The passive-margin sediments of the overlying Upper Cambrian-Devonian Crashsite Group record an up-sequence increase in late Neoproterozoic-Cambrian detrital zircons (ca. 650-480 Ma). The youngest detrital zircons were dated at ca. 480 Ma with major peaks at ca. 530 Ma and 500 Ma. Similar patterns are recorded in the Permian-Carboniferous Whiteout Conglomerate, with main components at ca. 650-500 Ma, and an absence of detrital zircons younger than Cambrian. The results, combined with stratigraphic constraints, suggest that sediments of the lower Heritage Group were derived from the paleo-Pacific margin of the Australian-Antarctic plate. Cryogenian igneous zircon ages from the Union Glacier Formation indicate proximal rift-related magmatism, previously only recognized in the Transantarctic Mountains, and they are interpreted to relate to the breakup of Rodinia. Sediments from the upper Heritage Group were derived from proximal sources, likely in Coats Land and Dronning Maud Land, with possible extensions into the Shackleton Range. This area was probably uplifted during the final amalgamation of ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land Union Glacier West Antarctica Australian National University: ANU Digital Collections Antarctic Dronning Maud Land West Antarctica Shackleton Transantarctic Mountains Pacific Ellsworth Mountains ENVELOPE(-85.000,-85.000,-78.750,-78.750) Shackleton Range ENVELOPE(-26.000,-26.000,-80.833,-80.833) Coats Land ENVELOPE(-27.500,-27.500,-77.000,-77.000) Union Glacier ENVELOPE(-82.500,-82.500,-79.750,-79.750) GSA Bulletin |
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Open Polar |
collection |
Australian National University: ANU Digital Collections |
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ftanucanberra |
language |
English |
description |
New sensitive high-resolution ion microprobe (SHRIMP) U-Pb detrital zircon ages from Cambrian to Permian-Carboniferous siliciclastic units in the Ellsworth Mountains constrain their provenance and maximum depositional age, as well as providing key information as to the tectonic evolution of a problematic region. The Cambrian Heritage Group was deposited in an active continental rift setting and has main zircon components of late Mesoproterozoic-early Neoproterozoic age (ca. 1300-900 Ma) with little to no contributions from older cratons. Two meta-volcaniclastic samples of the Union Glacier Formation (lower Heritage Group) have U-Pb zircon ages of ca. 675 Ma, indicating proximal Cryogenian volcanism and thereby raising questions as to the depositional age of this unit. Igneous and metamorphic zircons of late Neoproterozoic-early Cambrian age (650-530 Ma) are a secondary component present in the upper part of this group. The passive-margin sediments of the overlying Upper Cambrian-Devonian Crashsite Group record an up-sequence increase in late Neoproterozoic-Cambrian detrital zircons (ca. 650-480 Ma). The youngest detrital zircons were dated at ca. 480 Ma with major peaks at ca. 530 Ma and 500 Ma. Similar patterns are recorded in the Permian-Carboniferous Whiteout Conglomerate, with main components at ca. 650-500 Ma, and an absence of detrital zircons younger than Cambrian. The results, combined with stratigraphic constraints, suggest that sediments of the lower Heritage Group were derived from the paleo-Pacific margin of the Australian-Antarctic plate. Cryogenian igneous zircon ages from the Union Glacier Formation indicate proximal rift-related magmatism, previously only recognized in the Transantarctic Mountains, and they are interpreted to relate to the breakup of Rodinia. Sediments from the upper Heritage Group were derived from proximal sources, likely in Coats Land and Dronning Maud Land, with possible extensions into the Shackleton Range. This area was probably uplifted during the final amalgamation of ... |
format |
Article in Journal/Newspaper |
author |
Castillo Gonzalez, Paula Fanning, Christopher Fernandez, Rodrigo Poblete, Fernando Hervé, Francisco |
spellingShingle |
Castillo Gonzalez, Paula Fanning, Christopher Fernandez, Rodrigo Poblete, Fernando Hervé, Francisco Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology |
author_facet |
Castillo Gonzalez, Paula Fanning, Christopher Fernandez, Rodrigo Poblete, Fernando Hervé, Francisco |
author_sort |
Castillo Gonzalez, Paula |
title |
Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology |
title_short |
Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology |
title_full |
Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology |
title_fullStr |
Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology |
title_full_unstemmed |
Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology |
title_sort |
provenance and age constraints of paleozoic siliciclastic rocks from the ellsworth mountains in west antarctica, as determined by detrital zircon geochronology |
publisher |
Association of Engineering Geologists |
url |
http://hdl.handle.net/1885/203317 https://doi.org/10.1130/B31686.1 https://openresearch-repository.anu.edu.au/bitstream/1885/203317/5/01_Castillo%2bGonzalez_Provenance_and_age_constraints_2017.pdf.jpg |
long_lat |
ENVELOPE(-85.000,-85.000,-78.750,-78.750) ENVELOPE(-26.000,-26.000,-80.833,-80.833) ENVELOPE(-27.500,-27.500,-77.000,-77.000) ENVELOPE(-82.500,-82.500,-79.750,-79.750) |
geographic |
Antarctic Dronning Maud Land West Antarctica Shackleton Transantarctic Mountains Pacific Ellsworth Mountains Shackleton Range Coats Land Union Glacier |
geographic_facet |
Antarctic Dronning Maud Land West Antarctica Shackleton Transantarctic Mountains Pacific Ellsworth Mountains Shackleton Range Coats Land Union Glacier |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land Union Glacier West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land Union Glacier West Antarctica |
op_source |
Geological Society of America Bulletin |
op_relation |
0016-7606 http://hdl.handle.net/1885/203317 doi:10.1130/B31686.1 https://openresearch-repository.anu.edu.au/bitstream/1885/203317/5/01_Castillo%2bGonzalez_Provenance_and_age_constraints_2017.pdf.jpg |
op_rights |
© 2017 Geological Society of America |
op_doi |
https://doi.org/10.1130/B31686.1 |
container_title |
GSA Bulletin |
_version_ |
1788067228367716352 |