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

• Published in: GSA Bulletin
• Main Authors: Castillom, Paula, Fanning, C. Mark, Fernández, Rodrigo, Poblete, Fernando, Hervé Allamand, Francisco
• Format: Article in Journal/Newspaper
• Language: English
• Published: Geological Society of America 2017
• Subjects: Antarctic; Dronning Maud Land; West Antarctica; Shackleton; Transantarctic Mountains; Pacific; Ellsworth Mountains; Shackleton Range; Coats Land; Union Glacier; Antarc*; Antarctica
• Online Access: https://doi.org/10.1130/B31686.1; https://repositorio.uchile.cl/handle/2250/148876

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 ...