Zhang, Juan, Mao, Jing-wen, Cheng, Yanbo, and Li, Xiao-Long (2012) 40Ar-39Ar isotopic age study of phlogopite from Kafang altered basalt in Gejiu of Yunnan Province and its significance. Geology in China, 39 (6). pp. 1647-1656.

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Abstract

The Gejiu polymetallic tin ore district in Yunnan Province is the largest tin deposit in the world, and the Kafang copper (tin) deposit is a component part of this ore district. The stratoid ore body of the Kafang copper (tin) deposit, closely related to meta-basalt, is characterized by enriched copper. The basalt has been altered and the alteration intensity is related to the copper mineralization. This paper presents a new 110Ar-39Ar phlogopite age for the meta -basalt in the Kafang tin -copper deposit in order to constrain the timing and duration of the alteration of basalt and the mineralization. Phlogopite yielded 110Ar-39Ar plateau age of 85.49±0.63 Ma, isochronal age of 85.6210.42 Ma, and inverse isochronal age of 85.59±0.81 Ma. These ages are substantially consistent with each other, pointing to late Cretaceous. These results are coincident with the data obtained from the Gejiu polymetallic tin-copper deposit.

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