东天山白石渡银矿床的发现及其地球化学特征  

Discovery and geochemical characteristics of Baishidu Silver Deposit in East Tianshan

作　　者：贺昕宇 方同辉[4,5] 胡龙华 李斯 张驰 薄贺天 陈筱艳 王宏伟 付昱 刘铁成 肖文进[4] 马欢[2,3] He Xinyu;Fang Tonghui;Hu Longhua;Li Si;Zhang Chi;Bo Hetian;Chen Xiaoyan;Wang Hongwei;Fu Yu;Liu Tiecheng;Xiao Wenjin;Ma Huan(Research Center for Petrogenesis and Mineralization of Granitoid Rocks,China Geological Survey;School of Geoscience,China Institute of Disaster Prevention;Hebei Key Laboratory of Earthquake Dynamics;China Non-ferrous Metals Resource Geological Survey;Sino-Zijin Resources Co.,Ltd.;Henan Academy of Geology;Henan Fifth Geological Brigade Limited Company)

机构地区：[1]中国地质调查局花岗岩成岩成矿地质研究中心 [2]防灾科技学院地球科学学院 [3]河北省地震动力学重点实验室 [4]有色金属矿产地质调查中心 [5]中色紫金地质勘查(北京)有限责任公司 [6]河南省地质研究院 [7]河南省第五地质大队有限公司

出　　处：《黄金》2024年第11期18-26,共9页Gold

基　　金：中国地质调查局花岗岩成岩成矿地质研究中心开放基金(PM202306);河北省地震动力学重点实验室开放基金(FZ246101);中国地质调查局项目(DD20160011);河南省地质研究院地质科技攻关项目(2024-906-XM08)。

摘　　要：东天山是中国重要的矿产资源基地,但以银作为主矿种的矿床报道较少。白石渡银矿床是东天山首次报道的热液脉型银矿床,也是该地区发现的独立银矿床。该矿床主要赋矿围岩为晚石炭世—早二叠世肉红色斑状二长花岗岩及灰绿色闪长质岩脉,主矿体呈透镜状,走向北东,长约250 m,Ag品位48.5×10^(-6)~60.3×10^(-6),Pb品位5.24%~9.90%。矿床中方铅矿δ^(34) S值为3.8‰~6.3‰,平均值为5.01‰。石英δ^(18) O值为-8.3‰~-5.0‰,平均值为-6.30‰。研究表明,白石渡银矿床为热液脉型银矿床,不同于该区其他沉积改造型(或层控热液型)银矿床。该矿床成矿流体为岩浆水与大气降水混合,成矿物质为壳幔混源。在该矿床的底部或附近,具有属于同一成矿系统的斑岩型钼矿床的找矿潜力。East Tianshan is a crucial mineral resource base in China,yet silver-dominant deposits are rarely reported.Baishidu Silver Deposit,the first hydrothermal-vein type silver deposit reported in this region,is also the first independent silver deposit discovered.The host rocks are predominantly Late Carboniferous to Early Permian reddish porphyritic monzogranite and greyish-green dioritic dikes.The primary ore body is lens-shaped,trending northeast and extending about 250 m,with silver grades of 48.5×10^(-6) to 60.3×10^(-6) and lead grades of 5.24%to 9.90%.Theδ^(34) S values of galena range from^(3).8‰to 6.3‰,averaging 5.01‰,while quartzδ^(18) O values vary between-8.3‰and-5.0‰,averaging-6.30‰.The study suggests that Baishidu Silver Deposit is a hydrothermal-vein type,distinct from other sedimentary-transformed or stratabound hydrothermal silver deposits in the region.Mineralizing fluids are a mix of magmatic water and meteoric water,with the mineralizing materials deriving from both crustal and mantle sources.There is potential for discovering porphyry-type molybdenum deposits related to the same mineralization system near the base of this deposit.

关 键 词：矿床地球化学 白石渡 硫同位素 氧同位素 热液脉型银矿床 东天山 斑岩型 

分 类 号：TD11[矿业工程—矿山地质测量] P597[天文地球—地球化学] P612[天文地球—地质学]