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现代地质 ›› 2013, Vol. 27 ›› Issue (1): 13-23.

• 矿床学与地球化学 • 上一篇    下一篇

内蒙古苏尼特左旗乌日尼图钨钼矿床同位素地球化学特征

杨增海1，王建平1,2，刘家军1，王守光3，王清义4，康书光4，张捷先1，赵云1   

  1. 1地质过程与矿产资源国家重点实验室，中国地质大学 地球科学与资源学院， 北京100083；2桂林理工大学 广西隐伏
    金属矿产勘查重点实验室，广西 桂林541004；3内蒙古自治区地质调查院，内蒙古 呼和浩特010020；
    4内蒙古自治区第九地质矿产勘查开发院，内蒙古 锡林浩特026000
  • 收稿日期:2012-04-18 修回日期:2012-09-25 出版日期:2013-01-16 发布日期:2013-01-17
  • 通讯作者: 王建平，男，副教授，1972 年出生，矿物学、岩石学、矿床学专业，主要从事金属矿产资源的研究与教学工作。
  • 作者简介:杨增海，男，硕士研究生，1982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:yangzenghai21023@163.com。
  • 基金资助:

    国家重点基础研究发展计划项目(2012CB416600)；国家自然科学基金面上项目(41272106)；中国地质调查局矿产资源调查评价专项工作项目(1212011220923；1212011085471)；广西隐伏金属矿产勘查重点实验室开放课题(11-031-20-K6)

Isotope Geochemistry of the Wurinitu W-Mo Deposit in Sunid Zuoqi, Inner Mongolia, China

YANG Zeng-hai1, WANG Jian-ping1,2, LIU Jia-jun1, WANG Shou-guang3, WANG Qing-yi4, KANG Shu-guang4，ZHANG Jie-xian1, ZHAO Yun1   

  1. 1State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences,
    Beijing100083, China; 2Guangxi Key Laboratory of Hidden Metallic Ore Deposit Exploration, Guilin University of Technology,Guilin,
    Guangxi541004, China;3Geological Survey Institute of Inner Mongolia Autonomous Region, Hohhot, Inner Mongolia010020,China;
    4Inner Mongolia Ninth Geology Mineral Exploration and Development Institute, Xilinhaote,Inner Mongolia026000, China
  • Received:2012-04-18 Revised:2012-09-25 Online:2013-01-16 Published:2013-01-17

PDF (PC)

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摘要：

乌日尼图钨钼矿位于内蒙古苏尼特左旗境内，是近几年在该区新发现较大规模的钨钼矿床。钨钼矿体主要产于燕山期花岗岩体的内外接触带附近，以细脉状矿化类型为主。同位素测试结果表明：δ34SV-CDT值范围为0.6‰～4.1‰，组成较为稳定；显示钨钼矿体的形成与岩浆作用密切相关，硫可能主要来自岩浆源。矿石样品208Pb/204Pb值范围为38.115～38.353，207Pb/204Pb值范围为15.528～15.591，206Pb/204Pb值范围为18.375～18.528；铅构造模式图解和其参数综合分析表明成矿与岩浆作用密切相关，成矿物质来源于上地壳与地幔的混合，具有壳幔混合特点。热液方解石δ13CPDB=-8.63‰~-6.41‰，δ18OSMOW=-1.49‰～8.72‰，表明热液矿物方解石是2个阶段成矿作用的产物,早期成矿流体碳主要来源于岩浆；成矿作用后期有大气降水的加入。

关键词: 乌日尼图钨钼矿床, 成矿物质, 硫、铅同位素, 碳、氧同位素, 内蒙古苏尼特左旗

Abstract:

The Wurinitu W-Mo deposit，located in Sunid Zuoqi, Inner Mongolia, is a large scaled W-Mo deposit which is discovered in recent years.The W-Mo orebodies mainly occurred in Yanshanian granite rock body and the nearby contact zone，with the major type of veinlet mineralization.The measured δ34SV-CDT value of the Wurinitu orebody  (0.6‰ to 4.1‰)  varies in a very limited range and suggests that the formation of W-Mo ore-body is closely related to magmatism and the sulfur may be leached from the granite intrusion.Based on tectonic patterns of lead isotope and related parameters，the lead isotopic compositions of the Wurinitu orebody (208Pb/204Pb=38.115-38.353，207Pb/204Pb=15.528-15.591，206Pb/204Pb=18.375-18.528) indicate that the mineralization may be induced by the magmatism，and ore-forming material is characterized by the source of lower crust and show crustmantle mixing.δ13CPDB and δ18OSMOW of the hydrothermal calcite are from -8.63‰ to -6.41‰ and from -1.49‰ to 8.72‰, respectively.It shows that the hydrothermal calcite forms in two mineralization stages.The CO2 in the earlier stage is related to the magma；and the later hydrothermal ore fluids show the characteristics of mixture fluids of meteoric water with magmatic water as the meteoric water added.

Key words: Wurinitu W-Mo deposit, ore-forming material, sulfur and lead isotope, carbon and oxygen isotope, Sunid Zuoqi, Inner Mongolia

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