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...
Published in: | GSA Bulletin |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Geological Society of America
2017
|
Subjects: | |
Online Access: | https://doi.org/10.1130/B31686.1 https://repositorio.uchile.cl/handle/2250/148876 |
id |
ftunivchile:oai:repositorio.uchile.cl:2250/148876 |
---|---|
record_format |
openpolar |
spelling |
ftunivchile:oai:repositorio.uchile.cl:2250/148876 2023-05-15T13:41:41+02:00 Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology Castillom, Paula Fanning, C. Mark Fernández, Rodrigo Poblete, Fernando Hervé Allamand, Francisco 2017 application/pdf https://doi.org/10.1130/B31686.1 https://repositorio.uchile.cl/handle/2250/148876 en eng Geological Society of America GSA Bulletin; 2017; v. 129; no. 11/12: 1568–1584 doi:10.1130/B31686.1 https://repositorio.uchile.cl/handle/2250/148876 Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ CC-BY-NC-ND Geological Society of America Bulletin Artículo de revista 2017 ftunivchile https://doi.org/10.1130/B31686.1 2023-01-22T01:07:10Z 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 Universidad de Chile: Repositorio académico 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 |
institution |
Open Polar |
collection |
Universidad de Chile: Repositorio académico |
op_collection_id |
ftunivchile |
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 |
Castillom, Paula Fanning, C. Mark Fernández, Rodrigo Poblete, Fernando Hervé Allamand, Francisco |
spellingShingle |
Castillom, Paula Fanning, C. Mark Fernández, Rodrigo Poblete, Fernando Hervé Allamand, Francisco Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology |
author_facet |
Castillom, Paula Fanning, C. Mark Fernández, Rodrigo Poblete, Fernando Hervé Allamand, Francisco |
author_sort |
Castillom, 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 |
Geological Society of America |
publishDate |
2017 |
url |
https://doi.org/10.1130/B31686.1 https://repositorio.uchile.cl/handle/2250/148876 |
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 |
GSA Bulletin; 2017; v. 129; no. 11/12: 1568–1584 doi:10.1130/B31686.1 https://repositorio.uchile.cl/handle/2250/148876 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1130/B31686.1 |
container_title |
GSA Bulletin |
_version_ |
1766153827502784512 |