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Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology

2017; Geological Society of America; Linguagem: Inglês

10.1130/b31686.1

1943-2674

Paula Castillo, C. Mark Fanning, Rodrigo Fernández, Fernando Poblete, Francisco Hervé,

earthquake and tectonic studies

Research Article| July 14, 2017 Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology Paula Castillo; Paula Castillo † 1Research School of Earth Sciences, The Australian National University, Mills Road, Canberra, ACT 0200, Australia †paula.castillo@anu.edu.au Search for other works by this author on: GSW Google Scholar C. Mark Fanning; C. Mark Fanning 1Research School of Earth Sciences, The Australian National University, Mills Road, Canberra, ACT 0200, Australia Search for other works by this author on: GSW Google Scholar Rodrigo Fernandez; Rodrigo Fernandez 2Institute for Geophysics, Jackson School of Geosciences, The University of Texas at Austin, 10100 Burnet Road, Austin, Texas 78758, USA Search for other works by this author on: GSW Google Scholar Fernando Poblete; Fernando Poblete 3Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile4Géosciences Rennes, Université de Rennes 1, 35042 Rennes, France5Instituto de Ciencias de la Ingeniería, Universidad de O’Higgins, Gamero 357, Rancagua, Chile Search for other works by this author on: GSW Google Scholar Francisco Hervé Francisco Hervé 3Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile6Carrera de Geología, Universidad Nacional Andres Bello, Sazie 2119, Santiago, Chile Search for other works by this author on: GSW Google Scholar Author and Article Information Paula Castillo † 1Research School of Earth Sciences, The Australian National University, Mills Road, Canberra, ACT 0200, Australia C. Mark Fanning 1Research School of Earth Sciences, The Australian National University, Mills Road, Canberra, ACT 0200, Australia Rodrigo Fernandez 2Institute for Geophysics, Jackson School of Geosciences, The University of Texas at Austin, 10100 Burnet Road, Austin, Texas 78758, USA Fernando Poblete 3Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile4Géosciences Rennes, Université de Rennes 1, 35042 Rennes, France5Instituto de Ciencias de la Ingeniería, Universidad de O’Higgins, Gamero 357, Rancagua, Chile Francisco Hervé 3Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile6Carrera de Geología, Universidad Nacional Andres Bello, Sazie 2119, Santiago, Chile †paula.castillo@anu.edu.au Publisher: Geological Society of America Received: 25 Oct 2016 Revision Received: 10 Apr 2017 Accepted: 25 May 2017 First Online: 14 Jul 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2017 Geological Society of America GSA Bulletin (2017) 129 (11-12): 1568–1584. https://doi.org/10.1130/B31686.1 Article history Received: 25 Oct 2016 Revision Received: 10 Apr 2017 Accepted: 25 May 2017 First Online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Paula Castillo, C. Mark Fanning, Rodrigo Fernandez, Fernando Poblete, Francisco Hervé; Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology. GSA Bulletin 2017;; 129 (11-12): 1568–1584. doi: https://doi.org/10.1130/B31686.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract 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 Gondwana, which restricted the supply of sediment from older cratons. Sediments from the Crashsite Group allow for a more expansive source region, which could have been located in Dronning Maud Land, the Shackleton Range, the Transantarctic Mountains, and/or southern Africa. Sediments of the Whiteout Conglomerate, together with comparisons with other coeval glaciogenic strata, indicate that deposition during the Permian–Carboniferous was similar to that in the Transantarctic Mountains. Our data support that the Ellsworth-Whitmore Mountains crustal block was once part of the Australian-Antarctic plate rather than the southern African sector. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.