滇西兰坪盆地多金属矿床碳、氧、氢同位素组成及其地质意义  

C, O and H isotopic compositions of polymetallic deposits in Lanping Basin, Western Yunnan Province and their geological significance

作　　者：李志明[1] 刘家军[2] 秦建中[1] 廖宗廷[3] 张长江[1] 

机构地区：[1]中石化石油勘探开发研究院无锡实验地质研究所,江苏无锡214151 [2]中国地质大学,北京100083 [3]同济大学海洋与地球科学学院,上海200092

出　　处：《吉林大学学报（地球科学版）》2004年第3期360-366,共7页Journal of Jilin University：Earth Science Edition

基　　金：国家重点基础研究发展规划项目资助(G1999043208)

摘　　要：兰坪盆地多金属矿床碳、氧和氢同位素组成特征表明,成矿流体中的CO2源自海相碳酸盐岩(或蚀变海相碳酸盐岩)的热解作用和沉积有机物的氧化作用或脱羧基作用;成矿流体为古大气降水在一定地质条件下与盆地和基底岩石发生水岩作用而形成的盆地热卤水,其中金顶铅锌矿床的成矿流体尚有变质水的混入。这表明盆地内多金属矿床的成矿物质应源自地壳(基底和盆地地层),喜马拉雅期盆地周缘碱性岩浆活动对盆地内多金属矿床的成矿作用贡献是间接的,沉积有机物直接参与了成矿作用。The characteristics of C, O and H isotopic compositions of polymetallic deposits in the Lanping Basin has been studied. The results show that CO_(2) in ore-forming fluids were derived from thermal decomposition of marine carbonates (or altered marine carbonates) and oxidation and decarbonxylation of sedimentary organic matters; ore-forming fluids were hot brine of basin which derived from paleo-meteoric water by action of water and rocks of basin and basement under some geological conditions, however the ore-forming fluid of Jinding Pb-Zn polymetallic deposit may be mixed with metamorphic fluid. This indicates that ore-forming materials should be derived from crust (basement and strata of basin) and the activity of alkali magma of the Himalayan epoch in peripheral area of basin has made indirect contributions to mineralization of polymetallic deposits in the basin and the sedimentary organic matters had taken part in the mineralization.

关 键 词：碳、氧、氢同位素 地质意义 多金属矿床 滇西兰坪盆地 

分 类 号：P618.2[天文地球—矿床学]