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J4 ›› 2011, Vol. 17 ›› Issue (4): 513-520.

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The Confirmation of Yanshanian Biotite Granite in the Hehuaping Sn-Pb-Zn District, Southern Hunan Province, China

ZHANG Rong-qing, LU Jian-jun, WANG Ru-cheng, YAO Yuan, ZHU Jin-chu, MA Dong-sheng   

  1. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engneering,Nanjing University, Nanjing 210093, China
  • Received:2011-10-17 Revised:2011-11-05 Online:2011-12-20 Published:2011-12-20
  • Contact: Lu Jianjun,Professor;E-mail: lujj@nju.edu.cn

Abstract:

The Wangxianling granite was emplaced at the Indosinian (Triassic) period. The previous research considered that the
Hehuaping Sn-Pb-Zn deposit was an Indosinian deposit related to the Wangxianling pluton. Based on many years of investigationin the field and study of rocks from drilling holes, a buried pluton with lithological characteristics different from the Wangxianling granite was discovered in the Hehuaping district. A zircon U-Pb age of (157.1±0.8) Ma for the coarse-grained biotite granite from drilling hole was obtained by La-MC-ICP-MS, which suggests an early Yanshanian (Jurassic) emplacement. This granite is characterised by A/CNK value of 1.02, total REE content of 357×10-6, LREE/HREE ratio of 2.83 and Zr+Nb+Ce+Y content of398×10-6, on average. These features are similar to those of A-type granite and markedly different from those of the WangxianlingS-type granite. This Yanshanian granite, named as Hehuaping granite, has an affinity of the tin-bearing granites in the Nanling Range. Therefore, we argue that the Hehuaping Sn-Pb-Zn deposit is related to the Yanshanian buried Hehuaping pluton.

Key words: zircon U-Pb geochronology, biotite granite, Hehuaping Sn-Pb-Zn mine

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