2007•Acta Petrologica SinicaRequires access

Molybdenite Re/Os isochron age of the Wunugetu Shan porphyry Cu/Mo deposit, Inner Mongolia and its implication for metallogenic geodynamics.

Nuo Li

Abstract

The Wunugetu Shan porphyry Cu/Mo deposit,Inner Mongolia,is one of the largest Cu/Mo deposits in Northeast China. The Re/Os isotopic model ages of five molybdenite samples range from 166.1±2.0 to 176.4±2.8Ma,and yield an isochron age of 178±10Ma(1σ,MSWD=3.3),which is interpreted to be the hydrothermal metallogenic age of the deposit.The metallogenic porphyry-fluid system developed around 183±6Ma.In the regional tectonic evolution,the Wunugetu Shan porphyry Cu/Mo deposit was formed under a decompression-geothermal increasing regime during continental collision,instead of a magmatic arc related to B-type subduction.

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Key concepts: Molybdenite, Isochron, Geology, Geochemistry, Subduction, Geodynamics, Tectonics, Porphyry copper deposit