新疆乌拉根超大型铅锌矿床关键控矿因素分析  

The key ore-controlling factors of the Wulagen superlarge Zn-Pb Deposit,Xinjiang,China

作　　者：吕晓强 石苏东 杨卫立 胡海滨 阿迪力·麦合木提 李守业 祝新友 Lü Xiaoqiang;SHI Sudong;YANG Weili;HU Haibin;MAIHEMUTI Adili;LI Shouye;ZHU Xinyou(Sino-Zijin Resource Ltd.,Beijing 100012;Zijin Zinc Co.,Ltd.,Xinjiang Wuqia 845450;Mineral Exploration Institute,Zijin Mining Group Co.,Xiamen 361006)

机构地区：[1]中色紫金地质勘查(北京)有限责任公司,北京100012 [2]新疆紫金锌业有限公司,新疆乌恰845450 [3]紫金矿业集团股份有限公司矿产地质勘查院,厦门361006

出　　处：《矿产勘查》2021年第4期900-909,共10页Mineral Exploration

基　　金：中国铜业有限公司重点科技计划项目(编号:[2019]048号)资助。

摘　　要：新疆乌拉根超大型铅锌矿床属于与盆地卤水作用有关的砂岩型矿床,位于塔西南地区喀什凹陷北西部,该矿床成矿条件优越,成矿潜力巨大。为了厘定铅锌成矿过程中金属小范围超量聚集、沉淀成矿的关键性控矿因素,在已有资料二次开发的基础上,开展大比例尺找矿预测。区内铅锌矿化集中产出于克孜勒苏群(K_(1)kz)顶部砂砾岩、砾岩及砂岩建造中,少量赋存在阿尔塔什组(E_(1)a)因硬石膏岩溶解坍塌而形成的坍塌角砾岩建造内,矿体上部的齐姆根组(E_(1-2)q)低渗透率泥岩建造体现出良好的“盖层”属性,三者共同构成区域内铅锌成矿最有利的含矿建造组合。乌拉根向斜为区域上库什维克复式褶皱的一部分,属轴面北倾的斜歪褶皱,形态变化复杂;受北翼叠加近东西向延伸吾合沙鲁逆断层的影响,岩层产状变陡。铅锌矿体主要沿向斜的南、北两翼分布,乌拉根向斜是成矿作用所需的重要圈闭构造,也是富含铅锌成矿流体聚集的前提。区内铅锌矿化样式、强度、规模等空间分布差异性特点受含矿建造组合、向斜圈闭构造及中新世中晚期含矿盆地卤水运移方向等因素共同制约。Wulagen superlarge Zn-Pb deposit is a sandstone type deposit in Xinjiang Provine,which is related to basin brines.It is located in the northwestern of Kashi sag in Southwest Tarim Basin,with superior metallogenic conditions and great potential.In order to determine the key ore controlling factors of small-scale accumulation and precipitation of excess metals in the lead-zinc mineralization process,We based on the secondary development of existing data and the large-scale prospecting prediction was carried out.The lead-zinc mineralization in this area mainly occur in the glutenite,conglomerate and sandstone formation at the top of Kizilesu Group(K_(1)kz)and a small amount occur in the collapsing breccia formation formed by the dissolution and collapse of anhydrite in Aertashi Formation(E_(1)a).The superjacent mudstone of the weakly permeability,belonging to Qimugen Formation(E_(1-2)q)shows a good“cap rock”attribute,the three together constitute the most favorable ore-bearing construction association for lead-zinc mineralization in the region.Wulagen syncline is a part of Kushiweike synclinorium in the region,which is an oblique fold with North inclined axial plane and the shape is complex;The north wing is superimposed with the influence of nearly E-W strike Wuheshalu reverse fault,and the occurrence of strata becomes steep.The lead-zinc ore mineralization are mainly distributed along the south and north wings of syncline,and Wulagen syncline is an important trap structure for mineralization,which is the prerequisite for accumulation of lead-zinc-rich ore-forming fluids.The spatial distribution differences of Pb-Zn mineralization pattern,intensity and scale in the area are restricted by the combination of ore bearing formation,syncline trap structure and brine migration direction of ore bearing basin in the middle-late Miocene.

关 键 词：铅锌矿 建造组合 向斜构造 中新世中晚期 新疆乌恰 

分 类 号：P548[天文地球—构造地质学]