摘要
乌拉根铅锌矿床热卤水喷流沉积矿床,矿化分布于下第三系古新统乌拉根组第一、二岩性段,矿石结构构造兼有同生沉积及叠加改造特征,围岩蚀变为黄铁矿化、天青石化、石膏化及白云石化。矿石同位素研究表明成矿物质铅锌来自地壳深部或上地幔,硫主要来自海水硫酸盐的还原。成矿温度为64℃～193℃;成矿流体盐度7.22%～20.29%WtNaCl,成矿年龄45.4～54.0Ma。成矿作用经历了三个时期:1、热卤水喷流沉积成矿期;2、热卤水充填交代成矿期;3、表生氧化淋滤富集期。
The Wulagen Pb-Zn deposit is a kind of hot brine sedimentary exhalative deposits,which is located in first and second lithologic member of Wulagen Formtion of Palaeocene series of Eogene system.The characteristics of both syndepositional structure and superimposed texture can be found in the ores.Alteration of the surrounding rocks consists of pyritization,celestitization,gypsification and dolomitization.The study of ore isotope proves that the lead and zinc(metallogenic material) are delivered from deep crust or upper mantle,and the sulfur is formed by the reduction of sulphates in the seawater.The metallogenic temperature is 64℃~193℃;the salinity of ore-forming fluid is 7.2%~20.29%(Wt NaCl);the metallogenic age is 45.4~54.0 Ma.The mineralizing process can be divided into three phases,which are: 1.hot brine sedimentary exhalative mineralization phase;2.the hot brine filling and replacement phase,and 3.the supergene oxidized leaching and enrichment phase.
出处
《矿产与地质》
2012年第6期483-489,496,共8页
Mineral Resources and Geology
