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现代地质 ›› 2011, Vol. 25 ›› Issue (5): 861-868.

• 矿床学与岩石学 • 上一篇    下一篇

皖南东源钨钼矿床西源和江家矿段硫、铅同位素组成及成矿物质来源研究

杜玉雕1,2,余心起1,2,周翔1,2,傅建真3   

  1. 1. 中国地质大学 地质过程与矿产资源国家重点实验室,北京100083; 2 中国地质大学 地球科学与资源学院,北京100083;
    3 安徽省地质矿产勘查局332地质队,安徽 黄山245000
  • 收稿日期:2011-06-27 修回日期:2011-09-13 出版日期:2011-10-26 发布日期:2011-11-03
  • 作者简介:杜玉雕,男,硕士研究生,1985年出生,矿物学、岩石学、矿床学专业,主要从事矿床学与矿床地球化学的研究。Email:garnettdyd@sina.com。
  • 基金资助:

    安徽省国土资源厅公益性地质(科研)工作项目(2009-20)。

The Composition of Sulfur and Lead Isotope and the Source of Metallogenic Material from Xiyuan and Jiangjia Ore Blocks in the Dongyuan

 DU  Yu-Diao-1, 2 , TU  Xin-Qi-1, 2 , ZHOU  Xiang-1, 2 , FU  Jian-Zhen-3   

  1. 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083, China;
    2 School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China;
    3 332 Geological Team of Bureau of Geology and Mineral Resources Exploration of Anhui Province, Huangshan, Anhui245000, China
  • Received:2011-06-27 Revised:2011-09-13 Online:2011-10-26 Published:2011-11-03

摘要:

皖南东源钨钼矿位于安徽省祁门东源境内,是该地区目前已知规模最大的钨钼矿床。它由东源、江家和西源3个矿段组成。江家和西源矿段的钨钼矿体主要产于花岗闪长斑岩体内及其接触带附近,以细脉浸染状和浸染状矿化类型为主。测试结果表明:江家矿床δ34SV-CDT值介于2.6‰~4.9‰之间,西源矿床δ34SV-CDT值介于4.0‰~4.7‰之间,组成稳定;钨钼矿体的形成与岩浆作用相关,硫可能是从花岗闪长岩体中淋滤而来。江家矿床矿石样品208Pb/204Pb值介于38.264~38.400之间, 207Pb/204Pb值介于15.579~15.618之间, 206Pb/204Pb值介于18.222~18.369之间;西源矿床矿石样品208Pb/204Pb值介于38.360~38.442之间, 207Pb/204Pb值介于15.604~15.618之间, 206Pb/204Pb值介于18.240~18.251之间;根据铅构造模式图解和其参数综合分析,表明成矿物质与岩浆作用密切相关,整体上显示下地壳来源特征,具有壳幔混合特点。

关键词: 成矿物质, 同位素, 钨钼矿床, 皖南

Abstract:

The Dongyuan WMo deposit, located in Qimen County in southern Anhui Province, is the largest WMo deposit in this region thus far reported. The deposit consists of Dongyuan, Xiyuan, and Jiangjia ore blocks. The WMo orebodies in Jiangjia and Xiyuan ore blocks are mainly occurred in granodiorite porphyry and the nearby contact zone, with the major type of veinletdisseminated and disseminated mineralization. The measured δ34SVCDT values of Jiangjia (2.6‰ to 4.9‰) and Xiyuan (4.0‰ to 4.7‰) ore blocks vary in a very limited range and suggest that the formation of WMo orebody is closely related to magmatism, which involve the sulfur may be leached from the granodiorite intrusion. Based on tectonic patterns of lead isotope and related paramerters, the lead isotopic compositions of Jiangjia (206Pb/204Pb=18.222 to 18.369, 207Pb/204Pb=15.579 to 15.618, 208Pb/204Pb=38.264 to 38.400) and Xiyuan (206Pb/204Pb=18.240 to 18.251, 207Pb/204Pb=15.604 to 15.618, 208Pb/204Pb=38.360 to 38.442)  indicate that the metallogenic material is closely related to magmatism, and their leads are characterized by the source of lower crust and show crustmantle mixing.

Key words: metallogenic material, isotope, WMo deposit; , southern Anhui Province