贵州戈塘金矿滑脱构造及其与成矿的关系

金属矿山 ›› 2014, Vol. 43 ›› Issue (07): 106-109.

贵州戈塘金矿滑脱构造及其与成矿的关系

吴松洋^1,2，丁俊²，陈明^3,4，侯林²，张锦让²

1.成都理工大学地球科学学院，四川成都 610059；2.中国地质调查局成都地质调查中心，四川成都 610081；3.贵州地质矿产勘查开发局一0五地质大队，贵州贵阳 550018；4.贵州紫金矿业股份有限公司，贵州贞丰 562200

出版日期:2014-07-15 发布日期:2015-01-08
基金资助:
* 中国地质调查局项目（编号：12120113094400）。

Decollement Structures and Its Relationship with Mineralization in Getang Gold Deposit in Guizhou Province

Wu Songyang^1,2，Ding Jun²，Chen Ming^3,4，Hou Lin²，Zhang Jinrang²

1.Academy of Earth Science，Chengdu University of Technology，Chengdu 610059，China；2.Chengdu Institute of Geology and Mineral Resources，Chengdu 610081，China；3.Geological Party 105，Guizhou Bureau of Geology and Mineral Exploration and Development，Guiyang 550018，China;4.Guizhou Zijin Holding Company Ltd.，Zhenfeng 562200,China

Online:2014-07-15 Published:2015-01-08

摘要/Abstract

摘要： 通过对戈塘矿区野外地质现象的实地考察，矿床的矿体主要赋存于茅口组之上的古岩溶面，龙潭组一段为主要的含矿层。茅口组之上的古岩溶不整合面与龙潭组三段与四段之间的面均为层滑构造，龙潭组二段、三段以炭质黏土岩与薄层粉砂岩为主，为矿区的能干层。叠瓦构造体系是在印支期到燕山期的构造运动过程中形成的，这一时间段中区域压力由南北向转变为东西向，该体系是多期构造运动的结果。在软弱层中形成的叠瓦状逆冲断层的断裂面处于最大应力状态，呈挤压封闭状态，不利于成矿流体的运移，加之岩性的透水性差，对矿液起到了地球化学障的作用，对含矿溶液在层滑构造中的成矿提供了有力条件。另外，软弱层中存在炭质且向上逐渐变薄，当含矿热液经过时，pH值发生改变，热液含金浓度增大，并还原出了络合物中的金并将其吸附，由于进入软弱层中的矿质少，所以在该层中只发现了矿化而未发现矿体。

关键词: 构造变形, 古岩溶面, 地球化学障

Abstract: According to the field survey of geological phenomenon in Getang Gold deposit，the ore body of the deposit mainly occurs in the ancient karsts surface which is upon the Maokou formation，Section 1 of Longtan formation is the major ore-bearing layer.Both of ancient karsts side and the surface between the section three and four of Longtan formation are slip-sheet structure，the lithological combination of the second and third section of Longtan formation are clay stone with carbon and siltstone and this two sections are the intensified layer.The imbricate structure system is formed during the tectonic movement process between Indo-Chinese epoch and Yanshan epoch.During this period，the direction of regional pressure is changed from north-south to east-west，and the imbricate structure system is the result of multiphase tectonic movement.The fracture surface of imbricate thrust fault which is formed in the intensified layer is in a condition of maximum stress and closed extrusion，and this condition has disadvantage of the migration of ore-forming fluid.Additionally，poor water permeability of the rock plays a role of geochemical barrier to ore fluid，which provides the favorable conditions to the ore-forming of ore-bearing solution in the slip-sheet structure.Moreover，carbon exists in the intensified layer and becomes upward thinning.When the ore-bearing fluid flow through，the value of pH will be changed，the concentration of gold in fluid will be increased，and gold will be extracted from the clathrate and adsorbed by the carbon.Only relatively less mineral flow into the intensified layer，so just mineralization is found instead of ore body.

Key words: Tectonic deformation, Ancient karsts surface, Geochemical barrier

吴松洋, 丁俊, 陈明, 侯林, 张锦让. 贵州戈塘金矿滑脱构造及其与成矿的关系[J]. 金属矿山, 2014, 43(07): 106-109.

WU Song-Yang, DING Jun, CHEN Ming, HOU Lin, ZHANG Jin-Rang. Decollement Structures and Its Relationship with Mineralization in Getang Gold Deposit in Guizhou Province[J]. Metal Mine, 2014, 43(07): 106-109.

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