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

• 岩石学与矿床学 • 上一篇    下一篇

湘南荷花坪锡铅锌矿区燕山期黑云母花岗岩的厘定

章荣清, 陆建军, 王汝成, 姚 远, 朱金初, 马东升    

  1. 内生金属矿床成矿研究国家重点实验室,南京大学 地球科学与工程学院,南京 210093
  • 收稿日期:2011-10-17 修回日期:2011-11-05 出版日期:2011-12-20 发布日期:2011-12-20
  • 通讯作者: 陆建军, 教授, 主要从事矿床学教学和研究;
  • 作者简介:章荣清,男,1986年生,博士研究生,矿床学专业;
  • 基金资助:

    中国地质调查局调查项目“南岭重要金属矿床成矿机理研究和找矿潜力预测”(1212010632100);国家自然科学基金(40730423,40873029);“深部探测技术与实验研究专 项”(Sino Probe-03-01-4D)联合资助

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

摘要:

王仙岭花岗岩侵位于印支期。过去一直认为荷花坪锡铅锌矿为印支期矿床,与王仙岭岩体有关。经多年的野外考察
和钻孔资料研究发现,荷花坪地区存在隐伏花岗岩体,其岩性不同于王仙岭花岗岩。本文选取钻孔中粗粒黑云母花岗岩,
利用La-MC-ICP-MS法对其进行锆石年代学研究,获得U-Pb年龄为(157.1±0.8) Ma,显示其为燕山早期。荷花坪花岗岩
A/CNK比值为1.02, REE总量为357×10-6, LREE/HREE比值为2.83, Zr+Nb+Ce+Y含量为398×10-6,与A型花岗岩特征一致,
明显不同于王仙岭S型花岗岩。这些地球化学特征与南岭地区含锡花岗岩非常类似。南岭地区钨锡成矿大爆发发生在燕山早
期,荷花坪锡铅锌矿可能与此燕山期隐伏岩体有关。

关键词: 锆石U-Pb年龄;黑云母花岗岩;荷花坪锡铅锌矿

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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