Title Arc accretion to the early Paleozoic Antarctic margin of Gondwana in Victoria Land
Author Rocchi, S.; Bracciali, L.; Di Vincenzo, G.; Gemelli, M.; Ghezzo, C.
Author Affil Rocchi, S., Dipartimento di Scienze della Terra, Universita di Pisa, Pisa, Italy. Other: Chinese Academy of Sciences, China; Consiglio Nazionale delle Ricerche, Italy; Universita di Siena, Italy
Source Island arcs; their role in growth of accretionary orogens and mineral endowment, edited by R.A. Glen, C.D. Quinn and W. Xiao. Gondwana Research, 19(3), p.594-607. Publisher: Elsevier on behalf of International Association for Gondwana Research, Amsterdam and Kochi, International. ISSN: 1342-937X
Publication Date Apr. 2011
Notes In English. 154 refs. GeoRef Acc. No: 309730
Index Terms Australia--Tasmania; Antarctica-- Transantarctic Mountains; Antarctica-- Victoria Land; accretion; Admiralty crustal ribbon; Antarctic Plate; Antarctica; Australasia; Australia; Bowers arc-backarc; continental margin; deep-seated structures; Delamerian Orogeny; Gondwana; intraplate processes; lower Paleozoic; Neoproterozoic; Paleozoic; plate convergence; plate tectonics; Precambrian; Proterozoic; Ross Orogeny; subduction; Tasmania Australia; Tiger Arc; Transantarctic Mountains; upper Precambrian; Victoria Land; Wilson continental arc
Abstract The Antarctic Ross Orogen was built up during the early Paleozoic in the framework of the convergence between the Paleo-Pacific oceanic plate and the Gondwana continental margin. Models for the Ross Orogen in northern Victoria Land are based on terranes having a variable provenance with respect to the margin. However, recent studies provide evidence for the occurrence of different pieces of the lithospheric puzzle: (i) the Wilson continental magmatic arc, representing the main part of the active Gondwana margin, (ii) the Bowers arc-backarc system, (iii) the Admiralty crustal ribbon including continental material of the Wilson forearc, and (iv) the newly discovered, Cambrian oceanic magmatic Tiger arc, along the Ross Sea coast. An updated model is presented in which, after the Early Cambrian magmatic activity of the Wilson Arc, a retreat of the subduction zone in the Early-Middle Cambrian gave way to boudinage of the Wilson forearc, trenchward arc migration, opening of the Bowers backarc basin and inception of the outboard Tiger subduction zone. Renewed convergence resulted in the development of the Middle Cambrian Bowers Arc, closure of the backarc and deep underthrusting of portions of it at the Middle-Late Cambrian. Finally, in the latest Cambrian to earliest Ordovician, fast exhumation was coupled in the north with erosion and sediment shed to the northeast, and with extension and potassic magmatism in central and southern Victoria Land.
URL http://hdl.handle.net/10.1016/j.gr.2010.08.001
Publication Type journal article
Record ID 91375