Abstract
Abstract An isochron age of 282±20 (95% conf. limit) Ma of the sulfide ores in the Huangshandong Cu‐Ni sulfide deposit, the East Tianshan Mountains has been obtained through Re‐Os isotopic measurement. The age implies that the Cu‐Ni sulfide deposit and other related deposits in the same area occurred in a Permian extensional environment of post‐collision instead of Devonian‐Early Carboniferous ophiolite‐related oceanic or island arc environments inferred before. It shares the same ages with the orogenic and epithermal gold deposit systems in the same area. An initial 187Os/188Os ratio of 0.25±0.04 (1σ) and a γo8 value of 99 on average display the participation of large quantities of crustal components into the rock‐forming and ore‐forming system during mineralization and magmatic emplacement.
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