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现代地质 ›› 2007, Vol. 21 ›› Issue (4): 659-666.

• 岩石学与矿床学 • 上一篇    下一篇

云南沧源拱丁金多金属矿床的成矿特征及成因

罗石生1,2,杨贵来1,3,杨伟光1,和中华1   

  1. 1云南地质矿产资源股份有限公司,云南 昆明650215 ;2中国地质大学 地球科学学院,湖北 武汉430074;
     3中国地质大学 地球科学与资源学院, 北京100083
  • 收稿日期:2007-09-10 修回日期:2007-11-20 出版日期:2007-04-20 发布日期:2007-04-20
  • 作者简介:罗石生,男,高级工程师,博士研究生,1970年出生,矿物岩石矿床学专业,从事矿产地质及矿产资源勘查评价工作。Email:lus@sina.com。
  • 基金资助:

    国家重点基础研究发展规划项目(2004CB412603)

Characteristics and Genesis of the Gongding Gold-polymetallic Deposit, Cangyuan County, Yunnan Province

LUO Shi-sheng1,2,YANG Gui-lai1,3,YANG Wei-guang1, HE Zhong-hua   

  1. 1Yunnan Geology & Mineral Resources Co.Ltd, Kunming, Yunnan650215, China;
    2Faculty of Earth Sciences, China University of Geosciences, Wuhan, Hubei430074, China;
    3School of Earth Sciences and Resources,China University of Geosciences, Beijing100083,China
  • Received:2007-09-10 Revised:2007-11-20 Online:2007-04-20 Published:2007-04-20

摘要:

云南沧源拱丁金多金属矿床产于耿马花岗岩西接触带内带的构造破碎带中,矿体呈脉状,形态单一。矿石和脉石矿物的S、Pb同位素、流体包裹体的均一温度和成矿流体成分的分析结果表明,成矿流体来源于天水和岩浆流体的混合,成矿组分主要是从元古界地层中萃取的,但也包含有岩浆热液携带的深部成矿物质。成矿温度为217~353 ℃,属于中高温热液矿床。根据矿床的空间分布、围岩蚀变类型以及成矿时代分析,提出燕山晚期中酸性岩脉发育地段,特别是闪长玢岩岩脉群分布地段以及耿马花岗岩体与元古界西盟群王雅组接触带内带的构造破碎带,是重要的找矿标志和找矿方向。

关键词: 云南沧源拱丁, 金多金属矿床, 成矿特征, 矿床成因

Abstract:

The Gongding gold-polymetallic deposit of Cangyuan, western  Yunnan occurs in a fracture zone in inner contact of western margin of  the Gengma granite pluton. The ore bodies are simply vein-shaped. Analyses of S and Pb isotopes, and homogenization temperature and composition of fluid inclusions have been conducted. The results show that the ore-forming fluids likely came from meteoritic water mixed with magmatic fluids, and the metals might be extracted from the Proterozoic strata, with some kinds of deep source metallic components carried by magmatic fluids. The homogenization temperature is 217-353 ℃, belonging to intermediate-high temperature hydrothermal deposit. According to the spatial distribution of the ore deposit, wall-rock alteration and the timing of the ore formation, two types of settings could be of great potential for further prospecting. One is the setting where late-Yanshanian intermediate-acidic dikes, especially dioritic dikes, are concentrated; the other is fracture zones within inner contact of the Gengma granite pluton with the Proterozoic Ximeng Formation.

Key words: Gongding of Cangyuan County, Yunnan Province, gold-polymetallic deposit, metallogenetic chara

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