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Metallogenic Mechanism of the Tianbaoshan Pb—Zn Deposit,Sichuan

《中国地球化学学报:英文版》2000年 第2期 | 王小春 张哲儒   SouthwestInstituteofmetallurgicalMineralResourcesExplorationandDevelopment Chengdu610051 China InstituteGeochemistry CHineseAcademyofSciences Guiyang550002 China
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摘 要:The Tianbaoshan Pb-Zn deposit in Sichuan Province,exhibiting open-space-filling and /or replacement textures,occurs as being of vine style in the Sinian(Late Proterozoic) carbonate rocks,and is simple in ore composition.A systematic study of lead isotope and rareearth elements reveals that the ore-forming materials were derived from multiple sources.The ultimate source of the sulfur in all stages in seawater sulfate but the reducing mechanisms are different,The carbon was derved from marine carbonate and organic matter,The ore-forming fluid,meteoric in origin,belongs to a Ca^2+-Mg^2+-Cl^--Hco3^- type of weak acidic to alkalic solutions with a salinity of about 5wt% NaCl.The ore was formed at the depth of about 1 km from 150 to 250℃ during the main stage of ore deposition.The heated meteoric water,after extracting ore materials from wall rocks,evolved into ore-forming solution with a low salinity, in which metals were trasported as chloride complexes such as PbCl,ZnCl and ZnCl.The metal-bearing solution moved upward along deep faults to low-pressure zones,where the metal ions reacted with reduced sulfur and were precipitated as sulfied minerals.The textures of the minerals were controlled by the rate at which the reduced sulfur was supplied.
【分 类】【天文学、地球科学】 > 矿床学 > 矿床分类 > 有色金属 > 【天文学、地球科学】 > 矿床学 > 矿床分类 > 有色金属 >
【关键词】 金属成矿模式 铅锌矿床 四川 成矿作用 原生代 地质构造
【出 处】 《中国地球化学学报:英文版》2000年 第2期 121-133页 共13页
【收 录】 中文科技期刊数据库

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