内蒙古东升庙锌多金属硫铁矿床地质特征及成因探讨

时间:2022-03-16 09:35:28 公文范文 来源:网友投稿
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  摘要:通过对内蒙古东升庙多金属硫铁矿矿床地质、地球化学特征的研究,都清楚表明东升庙多金属矿床的形成,主要受沉积—构造环境(克拉通边缘裂谷系、断陷盆地)、岩相古地理(滨海一泻湖炭泥质碳酸盐岩相)和中元古代狼山—渣尔泰山同生断裂构造的控制,成矿作用以同生沉积作用为基础,成矿物质来源不是单一的。矿床的成矿作用分两期:前期为中元古代被动陆缘海底喷流沉积作用,后期为后续造山过程中岩浆热液叠加成矿作用,促使成矿物质的调整和重新组合。在东升庙矿床深部的区域狼山—渣尔泰山多金属成矿带,在层状硫化物原生矿体、多金属沉积层下部寻找根部矿体。
  关键词:东升庙矿床;地质特征;喷流沉积;岩浆热液叠加;矿床成因;深部找矿
  A discussion of geologic characteristics and cause Zn-Pb-Sulfur Ore Deposit in DongShengMiao,Inner Mongolia
  ZHAN JingYi
  Inner Mongolia Geochemical Prospecting Institale of Chinda Chemical Geology and Mine Bereau,Hohhot010020,China
  Abstract:The geological and geochemical characteristics of Zn-Pb-Sulfur ore deposit both suggested that there were more than one ore-forming material source in Dong Sheng Miao,Inner Mongolia. The ore deposit depended on sedimentary tectonic environment in Craton marginal rift system and down-faulted basin,lithofacies-paleogeography in BinHai-lithofacies of Carbonaceous carbonate of lagoons and contemporaneous fault structure in Lang MountainChaertai mountain of Mesoproterozoic Era. The mineralization of the ore deposit was based on Syngeneticprecipition,which involved two periods. The earlier period was sedimentary exhalative processes of passive continental margin in Mesoproterozoic Era,while the later was magmatic hydrothermal superimposed during subsequent orogenic process,which made the adjustment and recombined. Therefore,to prospect the root orebody in the deep of Zn-Pb- Sulfursediments,primary orebody of stratiform sulfide,Metallogenic Belt of the Lang mountain-Chaertai mountain in the deep of ore deposit DongShengMiao.
  Key words:DongShengMiao ore deposit,geologic characteristics,sedimentary exhalative processes,magmatic hydrothermal superimposed,ore deposit genesis,deep ore prospecting
  引言
  内蒙古乌拉特后旗东升庙多金属硫铁矿床是狼山—渣尔泰山多金属成矿带内最大的铜铅锌多金属硫铁矿床。1992年前的勘查在东升庙矿区(43-40勘探线)发现多层单硫、锌硫、单锌和铜锌硫矿体分布于渣尔泰山群增隆昌组二岩段、阿古鲁沟组一、二岩段,圈定主要矿体11个;阿古鲁沟组二岩段底部为②号富锌硫及富硫矿体,阿古鲁沟组一岩段底部为矿区最大的⑨号单锌矿体,增隆昌组二岩段底部为矿区最大的①号富硫矿体。前人认为其为产于碳酸盐岩中的海底喷气沉積型多金属硫铁矿床。2005年~2008年在东升庙矿区40勘探线以东(40-88勘探线)即东升庙矿区三贵口矿段阿古鲁沟组一岩段底部探明一个厚度大、层位稳定的⑨号单锌矿体,为东升庙矿区⑨号单锌矿体向东的延伸;批准储量达到超大型铅锌矿床规模,为老矿区外围就矿找矿取得突破的典型案例。2010年~2016年对东升庙矿区3-40勘探线深部(700m标高以下)勘探发现①号单硫矿体如盆底赋存在增隆昌组二岩段底部并含有多层单锌、锌硫矿体,其下部书记沟组顶部发现多层单锌、锌硫、单硫矿体,编为??号矿体;批准储量达到大型铅锌矿床规模,是老矿区深部就矿找矿取得的突破的典型案例。经多年的勘探和储量核实对该矿床有了新的认识,本文主要对该矿床矿体形态、矿石类型、地质、地球化学特征进行研究,探讨地质特征、矿床成因及区域找矿问题。
  1.成矿地质背景
  研究区范围:东经107°02′30″~107°05′37″,北纬41°06′15″~41°07′55″;处于华北地台(Ⅰ级)北缘,内蒙古地轴西段,狼山—白云鄂博台缘凹陷(Ⅱ级),渣尔泰山—狼山褶皱束(Ⅲ级)。北侧以沃博尔铜格—川井—温都尔庙断裂为界与华力西晚期褶皱带毗邻,南与山西台隆及鄂尔多斯台坳相接。矿区位于渣尔泰山—狼山多金属成矿带内、成矿地质环境十分有利,与炭窑口多金属硫铁矿、甲生盘硫多金属矿同处于狼山至渣尔泰山南缘多金属成矿带上。该带内若干断隐盆地断续分布,盆内中元古界渣尔泰群主要形成Zn(Pb)-S-Cu炭泥粉砂—碳酸盐岩建造,本区层控硫多金属矿床均产于该建造类型。

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