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内蒙古翁牛特旗青石洞子斑岩型钼铅锌矿床 成矿时代及矿床成因研究
- 作者：
付丽娟|宁生元|张化鹏|王可勇|苗海兵|张天智|谷建军
- 作者单位：
- （1. 内蒙古山金地质矿产勘查有限公司；2. 吉林大学地球科学学院）
基金项目：
- 国家自然科学基金项目（92062216）
详细信息：
- 作者简介：
- 付丽娟（1991—），女，工程师，硕士，从事矿产普查与勘探工作；E‑mail：fulijuan@sd-gold. com
- 通讯作者：
- 王可勇（1965—），男，教授，博士，从事矿产普查与勘探、矿床学方面研究工作；E‑mail：Wangky@jlu. edu. cn
- PDF下载
Mineralization age and genesis of the Qingshidongzi porphyry‑type Mo-Pb-Zn Deposit in Ongniud Banner, Inner Mongolia
- English Author：
Fu Lijuan¹, Ning Shengyuan¹, Zhang Huapeng¹, Wang Keyong², Miao Haibing¹, Zhang Tianzhi¹, Gu Jianjun¹
- Unit：
- （1. Inner Mongolia Shandong Gold Geological Minerals Survey Co., Ltd.; 2. College of Earth Sciences, Jilin University）
- 摘要
- 在线预览
- 参考文献
摘要:
青石洞子钼铅锌矿床为内蒙古翁牛特旗近期发现的一大型斑岩型矿床，具有上铅锌矿化、下钼矿化的垂直分带规律。上部铅锌矿体主要产于额里图组安山岩中，深部钼矿体产于钾长花岗岩-二长花岗岩等杂岩体中。根据矿石矿物组合、结构构造和矿脉穿切关系，将其成矿作用划分为石英-辉钼矿阶段（Ⅰ）、石英-黄铁矿阶段（Ⅱ）、石英-多金属硫化物阶段（Ⅲ）、石英-方铅矿-闪锌矿阶段（Ⅳ）及石英-碳酸盐阶段（Ⅴ）5个成矿阶段。各成矿阶段流体包裹体和Ⅰ、Ⅱ及Ⅳ成矿阶段H-O同位素分析结果表明，青石洞子钼铅锌矿床的成矿流体早期以岩浆热液为主，混合少量大气降水；随着成矿作用进行，越来越多大气降水不断混入，至成矿作用晚期逐渐过渡为以大气降水为主的热液。Ⅰ成矿阶段的辉钼矿Re-Os同位素和Ⅲ、Ⅳ成矿阶段的金属硫化物硫同位素分析结果表明，成矿物质主要为岩浆来源，可能有少量的地层加入。矿区地表及钻孔岩芯等不同部位的辉钼矿 Re-Os同位素等时线年龄为 164 Ma±14 Ma，表明矿床成矿作用发生于中侏罗世，形成于蒙古—鄂霍茨克洋闭合后的碰撞造山阶段。
关键词:
青石洞子；钼铅锌矿床；翁牛特旗；成矿流体；成矿物质；成矿时代；矿床成因
Abstract:
The Qingshidongzi Mo-Pb-Zn Deposit, recently discovered in Ongniud Banner, Inner Mongolia, is a large porphyry-type deposit characterized by a vertical zonation pattern with upper Pb-Zn mineralization and Iower Mo mineralization. The upper Pb-Zn orebodies mainly occur in the Elitu Formation andesite, while the deep Mo orebodies are hosted in a complex of K-feldspar granite and monzogranite. Based on ore mineral assemblages and the crosscutting relationships of textures and veins.5 mineralization stages are identified: quartz-molybdenite stage (I ). quartz-pvrite stage (II ), quartz-polymetallic sulfide stage (III ), quartz-galena-sphalerite stage (IV), and quartz-carbonate stage (V).Fluid inclusions from each stage, along with H-O isotopic analysis results from stages I, II , and IV, indicate that the early ore-forming fluids in Qingshidongz zi Mo-Pb-Zn Deposit were primarily magmatic hydrothermal fluids with minor meteoric water input. As mineralization progressed, meteoric water increasingly mixed in, and by the late stages, out. the hydrothermal system was dominated by meteoric water. Re-Os isotope dating of molybdenite from stage I and sulfur isotope analyses of metal sulfides from stages III and IV suggest that the ore-forming materials were mainly magmatic in origin, with minor contributions from surrounding strata. Re-Os isochron ages of molybdenite from surface and drill cores yield a mineralization age of 164 Ma + 14 Ma, indicating that the deposit formed during the Middle Jurassic, in the collisional orogenic stage following the closure of the Mongol-Okhotsk Ocean.
Keywords:
Qingshidongzi; Mo-Pb-Zn deposit; Ongniud Banner; ore‑forming fluid; ore‑forming materials; mineralization age; deposit genesis
