青海尖顶山锶矿床地质特征及成因分析  

Geological Characteristics and Genetic Analysis of the Jiandingshan Strontium Deposit in Western Qaidam Basin

作　　者：陈秉芳[1] 林文山 白建海[1] 赵海霞[1] 李建亮 任华[1] 白宗海[1] 付军[1] CHEN Bingfang;LIN Wenshan;BAI Jianhai;ZHAO Haixia;LI Jianliang;REN Hua;BAI Zonghai;FU Jun(Qinghai Provincial Key Laboratory of Geological Processes and Mineral Resources of Northern Qinghai Tibetan Plateau~ Qinghai Institute of Geological Survey~ Xining 810012,Qinghai,China;Qinghai Province Third Geological and Mineral Exploration Institute,Xining 810001,Qinghai,China)

机构地区：[1]青海省地质调查院,青海省青藏高原北部地质过程与矿产资源重点实验室,青海西宁810012 [2]青海省第三地质矿产勘查院,青海西宁810001

出　　处：《西北地质》2018年第4期184-193,共10页Northwestern Geology

基　　金：青海省科技计划项目“柴达木盆地北缘铌钽多金属矿成矿作用及找矿方向研究”(2016-ZJ-716);“东昆仑东段银多金属成矿规律研究与靶区优选”(2016-ZJ-719);“柴北缘战略性新兴矿产找矿突破及关键技术示范”(2018-SF-109)

摘　　要：尖顶山天青石矿床位于柴达木盆地西北缘,矿体主要产于上新统狮子沟组上段含碳钙质泥岩及灰岩中,呈层状、似层状、透镜状,矿石以原生天青石矿石为主,品位较高,连续性好。含矿砂岩ΣREE值较低,平均为42.73×10^(-6),LREE/HREE平均为6.48;δEu平均为0.94,δCe平均为0.98;La/Yb-REE图中含矿岩石投点于沉积岩区,显示成矿物源具有多来源性特征;天青石矿的形成可能与深层地下卤水及盆地周缘陆缘碎屑物质富矿流体的补给紧密相关,表明该矿床成因可能具有陆源碎屑化学沉积型特征。The Jiandingshan celestite deposit is located in the northwestern margin of the Qaidam Basin. The orebodies are mainly situated with layered, layered, lenticular shapes in calcareous mudstone containing carbon and limestone from the upper member of Pliocene Shizigou group. Orebody is mainly composed of native celestite, with high grade and good spatial continuity. Ore hearing sandstone has lower EREE value with an average value of 42. 73 X10 6, its LREE/HREE ratio is 6.48, and 3Eu （0.94） and 3Ce （0.98） slightly negative anomaly. La/Yb REE Plots de note that the ore forming materials were derived from multiple sources with a main contribution from sedimentary rocks. The fluids for celestine formation might be derived from underground brine and peripheral continental basin. In summary, it＇s believed that this deposit may be had the characteristics of terrestrial detrital chemical deposition.

关 键 词：尖顶山 天青石 稀土元素 成矿物源 矿床成因 

分 类 号：P595[天文地球—地球化学]