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Geology, geochemistry and tectonic setting of the Indosinian Mo deposits in southern Great Hinggan Range, NE China



The southern Great Hinggan Range in northeast China, mainly bounded by the Kangbao–Chifeng Fault to the south and the Hegenshan–Heihe Suture to the north, is a Palaeozoic subduction-related accretionary belt added to the northern margin of the North China Craton. The area has been considered as a Yanshanian metallogenic province, with more than 20 Mo deposits being discovered. Recently, six of the Mo deposits were proven to have formed during the Indosinian (Triassic) Orogeny, indicating the significance of the Indosinian mineralization, orogeny and magmatism. In this contribution, we summarize available data of the Indosinian Mo deposits, and show that Triassic Mo mineralization occurred in the time range of 248–232 Ma, coincident with a regional granitic event, and was presented as porphyry and intrusion-related quartz vein systems. The Indosinian ore-related granitoids show geochemical features of high-K calc-alkaline metaluminous–peraluminous and adakitic rocks, and have been formed by partial melting of thickened lower crust in a post-subduction tectonic setting. Rhenium contents of molybdenite crystals and sulphur–lead isotopic compositions indicate that the ore-forming materials originated from continental crust with some mantle components involved. Copyright © 2014 John Wiley & Sons, Ltd.

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