投稿时间：2011-01-12
修订日期：2011-12-04
中文摘要:阿北银铅矿位于新疆若羌县境内,是阿尔金山东段地区近年来新发现的中型多金属矿床之一,在区域构造上位于NE向阿尔金走滑断裂北侧与EW向阿尔金北缘断裂所夹持的区域。该矿区的控矿构造出露于早古生代二长花岗岩中,是叠加在韧性变形基础上发育起来的韧脆性断裂破碎带,在平面和剖面上均表现为弧形裂隙夹透镜状花岗岩岩块的结构特点。韧脆性断裂破碎带是阿北银铅矿重要的控矿构造,其形态、规模、产状和分布控制着矿体的形态、规模、产状和分布。硫同位素组成特征显示出硫源很可能是海相沉积岩来源的硫与岩浆岩来源硫的混合;铅同位素组成显示其来源于上地壳;氢、氧同位素特点反映出成矿流体以岩浆水为主,并有少量大气降水混入。结合构造演化和构造控矿特征进行分析,认为该矿床是受韧脆性裂隙控制的、与早古生代中-晚期红柳沟-拉配泉弧后盆地封闭碰撞作用伴生的中-酸性岩浆活动有关的岩浆热液型矿床。
Abstract:Located in Ruoqiang County of Xinjiang, the Abei ore deposit is a medium-size Ag-Pb deposit recently discovered in eastern Altun Mountains. Tectonically, it is sandwiched between NE-trending Altun strike-slip fault and EW-trending northern Altun marginal fault. The ore-controlling structure in the ore deposit is the high-angle brittle fracture developed on the basis of the deformed adamellite and in the form of several arcuated fractures intercalated with granite lenses both in plane and in section. The brittle fracture is the important ore-controlling structure, and its shape, attitude, size and distribution control the Ag-Pb ore bodies. The δ34S values (11.9‰~16.3‰) suggest a mixed marine sedimentary and magmatic sulfur source. The average Pb isotopic compositions of seven samples from the Abei Ag-Pb deposit are 208Pb/204Pb=38.339 2, 207Pb/204Pb=15.632 4 and 206Pb /204Pb=18.379 2, which indicate that the Pb of the ore came mostly from the upper crust, while the average hydrogen-oxygen isotopic compositions of four samples ( δ18Owater=3.0‰,δD=-66‰) indicate that ore fluids came mainly from remelted magmatic water with the participation of small amounts of atmospheric water. In combination with an analysis of the regional tectonic evolution and features of the ore-controlling structure, the authors hold that the Abei Ag-Pb ore deposit is a magmatic hydrothermal ore deposit controlled by high-angle brittle fracture and related to intermediate-acid magmatic activity during the closure and collision of Hongliugou-Lapeiquan back-arc basin in late Early Paleozoic.
keywords:geology geochemistry ore-controlling structure deposit origin magmatic hydrothermal solution type Abei Ag-Pb deposit Xinjiang
文章编号：
中图分类号：P618.52; P618.42
文献标志码：
基金项目:本文得到"十一·五"国家科技支撑计划重点项目(编号:2006BAB07B02-04)的资助
引用文本：
陈柏林,赵恒乐,马玉周,杨风,王世新,陈正乐,祁万修,刘荣,蒋荣宝,李丽.2012.阿尔金山阿北银铅矿控矿构造特征与矿床成因初探[J].矿床地质,31(1):13~26CHEN BaiLin,ZHAO HengLe,MA YuZhou,YANG Feng,WANG ShiXin,CHEN ZhengLe,QI WanXiu,LIU Rong,JIANG RongBao,LI Li.2012.A preliminary discussion on genesis and structural control of Abei silver-lead deposit in eastern Altun Mountains[J].Mineral Deposits31(1):13~26
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