首页 | 本学科首页   官方微博 | 高级检索  
     

内蒙拜仁达坝银铅锌多金属矿床成矿条件
引用本文:孙丰月,王力. 内蒙拜仁达坝银铅锌多金属矿床成矿条件[J]. 吉林大学学报(地球科学版), 2008, 38(3): 376-383
作者姓名:孙丰月  王力
作者单位:吉林大学 地球科学学院,长春 130061
基金项目:全国危机矿山接替资源找矿项目
摘    要:内蒙拜仁达坝银铅锌多金属矿床是受断裂构造控制的中温热液脉状矿床。矿床主要受东西向压扭性断裂控制,矿体富集在断裂产状变缓地段。矿体的赋矿围岩主要为海西期石英闪长岩,海西期基性脉岩为成矿提供物源,燕山期霏细岩脉为成矿提供了主要的热源。流体包裹体研究表明,成矿流体具有低盐度(w(NaCl)为5.0%~7.8%)、低密度(0.66~0.95 g/cm3)的特点,成矿以中温(280~300℃)为主,成矿压力为76~80 MPa,成矿深度为6.8~7.2 km。矿石中黄铁矿单矿物硫同位素分析结果表明,δ34S值变化范围为-0.99‰~0.36‰,平均值为-0.315‰,为幔源硫来源。根据地质特征分析,推测在矿区中部的山谷内存在一条北西向成矿后断裂,它将矿床分为南北两个矿段,使北矿段被抬升,剥蚀程度较大,矿体埋藏较浅;南矿段剥蚀则较弱,矿体埋深较深,深部仍存在较大的找矿潜力。

关 键 词:内蒙  拜仁达坝银铅锌多金属矿床  成矿流体  控矿条件  
文章编号:1671-5888(2008)03-0376-08
收稿时间:2007-06-23
修稿时间:2007-06-23

Ore-Forming Conditions of Bairendaba Ag-Pb-Zn Polymetallic Ore Deposit, Inner Mongolia
SUN Feng-yue,WANG Li. Ore-Forming Conditions of Bairendaba Ag-Pb-Zn Polymetallic Ore Deposit, Inner Mongolia[J]. Journal of Jilin Unviersity:Earth Science Edition, 2008, 38(3): 376-383
Authors:SUN Feng-yue  WANG Li
Affiliation:College of Earth Sciences, Jilin University, Changchun 130061, China
Abstract:Bairendaba Ag-Pb-Zn polymetallic ore deposit, Inner Mongolia, belongs to a mesothermal vein-type deposit controlled by fractures, which are mainly E-W trending compresso-shearing faults with the relative flat-dipping other than steep-dipping parts being the favorable ore-hosting locations. The wall rocks of the ore bodies are mainly Hercynian quartz diorite. It is suggested that the Hercynian mafic rocks are the source for ore-forming materials while Yanshanian felsites might provide the heat driving meteoric water cycling. Based on fluid inclusion study, it has been recognized that the ore-forming hydrothermal fluid has the features like low salinity(5.0%~7.8% NaCl), low density(0.66-0.95 g/cm3),intermediate temperature(280-300℃). The ore-forming pressures are from 76 to 80 MPa, which reflect the mineralising depth ranges from 6.8 to 7.2 km. The sulfur isotope of the ore pyrites varies from -0.99‰ to 0.36‰ with an average value of -0.315‰, which is similar to mantle sulfur value. According to geological study, it is suggested that there exists a post-ore fault that extends along the NW-striked valley in the district, which dissects the ore district into two parts, i.e. north and south sections, and causes the former uplifted with bigger denudation and the latter relatively down. Therefore, the ore bodies are shallower within the north section than in the south section while the latter still has good potentiality for further ore prospecting.
Keywords:Inner Mongolia  Bairendaba Ag-Pb-Zn polymetallic ore deposit  ore-forming fluid  ore-controlling conditions
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《吉林大学学报(地球科学版)》浏览原始摘要信息
点击此处可从《吉林大学学报(地球科学版)》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号