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Economic Geology; January-February; v. 104; no. 1; p. 127-136; DOI: 10.2113/gsecongeo.104.1.127
© 2009 Society of Economic Geologists
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Scientific Communications

JURASSIC U-Pb AND Re-Os AGES FOR THE NEWLY DISCOVERED XIETONGMEN Cu-Au PORPHYRY DISTRICT, TIBET, PRC: IMPLICATIONS FOR METALLOGENIC EPOCHS IN THE SOUTHERN GANGDESE BELT

Reza Tafti and James K. Mortensen{dagger}

Department of Earth and Ocean Sciences, The University of British Columbia, 6339 Stores Road, Vancouver, BC, Canada V6T 1Z4

James R. Lang, Mark Rebagliati and James L. Oliver

Hunter Dickinson Incorporated, 1020-800 West Pender St., Vancouver, BC, Canada V6C 2V6

{dagger} Corresponding author: e-mail: rtafti{at}eos.ubc.ca

The Gangdese belt in southern Tibet includes the Cretaceous to early Eocene Gangdese continental magmatic arc, a newly recognized Middle Jurassic magmatic arc, and post-Gangdese arc magmatism of Miocene age that is well known for its association with important copper-molybdenum deposits. Although the tectonic history of the Gangdese continental arc is relatively well constrained, the tectonomagmatic setting of the Jurassic and Miocene magmatic events was poorly constrained previously. Geochronological analysis of samples from the Xietongmen copper-gold porphyry district has identified a previously unknown metallogenic event related to Middle Jurassic arc magmatism. The occurrence of several metallogenic epochs within the southern Gangdese belt highlights the importance of systematic metallogenic studies of this belt.






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