Abstract
The Shamai tungsten deposit in Inner Mongolia is located in the Xing’an Mongolia Orogenic Belt, east part of the Central Asian Orogenic Belt. Orebodies exist in the fault zone of the biotite monzogranite (porphyry), in the pegmatite and greisen forms. This paper presents precise 40Ar/39Ar ages of muscovite related to the mineralization by laser incremental 40Ar/39Ar analysis. Muscovite yielded a well-defined 40Ar/39Ar plateau age of (138.4 ± 0.84) Ma, with normal and inverse isochron ages being (137.32 ± 0.73) Ma and (137.35 ± 0.73) Ma. These ages can represent the formation age of the deposit and suggest that the Shamai deposit is related to the magmatic activities of Yanshanian period, which is in conformity with things of the regional metallogenic events. Combined with the previous studies of the geodynamic settings of South China, the authors consider that Shamai tungsten deposit might be formed in an intracontinental extensional setting following the collision.
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