Articolo in rivista, 2005, ENG, 10.1111/j.1365-3121.2005.00606.x

Surgeon island granite SHRIMP zircon ages: a clue for cambrian tectonic setting and evolution of the Palaeopacific margin of Gondwana (northern Victoria Land, Antartica).

A.M. Fioretti; G. Capponi; L.P. Black; R. Varne; D. Visona:

1)CNR-Istituto di Geoscienze e Georisorse, c.so Garibaldi, 37, I-35137 Padova, Italy; 2)Dip.to per lo Studio del Territorio e delle sue Risorse, Universita di Genova, c.so Europa 26, I-16132 Genova, Italy; 3) Minerals Division, Geoscience Australia, PO Box 378, Canberra ACT 2601, Australia; 4) Geology Department, University of Tasmania, Hobart, Tasmania, Australia; 5) Dip.to di Mineralogia e Petrologia, Universita di Padova, c.so Garibaldi, 37, I-35137 Padova, Italy; 6) Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia

In northern Victoria Land (NVL), Antarctica, the palaeopacific margin of Gondwana is made up of the inboard Wilson (WT) and the two outboard Bowers (BT) and Robertson Bay (RBT) terranes. The occurrence of a Cambro-Ordovician magmatic arc in the WT argues for a southwestward subduction leading to the final configuration of this margin during the Ross-Delamerian Orogeny. A U-Pb SHRIMP crystallization age (511.7 ± 2.9 Ma) obtained on the Surgeon Island Granite (SIG), located at the eastern end of the RBT, indicates that the SIG also belongs to the Ross cycle, and provides evidence for multiple subduction zones during the Ross Orogeny. Structural observations show that the SIG and its country rocks are basement to the RBT turbidites. SIG inherited zircon ages indicate the occurrence of Proterozoic crust east of the RBT and constrains the location of the Proterozoic-Palaeozoic boundary in Cambrian Gondwana.

TERRA nova (Print) 17 , pp. 242–249

Keywords

Surgeon Island, SHRIMP age, Gondwana, Antarctica, tectonic setting

CNR authors

Fioretti Anna Maria

CNR institutes

IGG – Istituto di geoscienze e georisorse

ID: 29226

Year: 2005

Type: Articolo in rivista

Creation: 2009-06-16 00:00:00.000

Last update: 2012-06-04 16:54:06.000

External links

OAI-PMH: Dublin Core

OAI-PMH: Mods

OAI-PMH: RDF

DOI: 10.1111/j.1365-3121.2005.00606.x

External IDs

CNR OAI-PMH: oai:it.cnr:prodotti:29226

DOI: 10.1111/j.1365-3121.2005.00606.x

ISI Web of Science (WOS): 000229390200006

Scopus: 2-s2.0-20844442660