摘要
毛登矿床是产于花岗斑岩内、外接触带（以外接触带为主）的热液脉型锡铜矿床，在容矿构造、矿脉（体）类型及矿石类型、金属矿物组合及主要金属矿物标型、热液蚀变及元素地球化学等诸方面，自花岗斑岩向外，显示出明显的顺向（侧向）脉动分带。研究认为，在时间和空间上互为协调一致的构造的脉动和热液的脉动，以及流体的规律性演化，是形成该矿床成矿分带的主要原因。根据其分带型式，推测毛登矿床外围有可能找到铜铅锌银矿体。
Located 50 km northeast of Xinlin Hot, Inner Mongolia, the Maodeng tin copper deposit is one of the tin polymetallic deposits in the central south part of Da Hinggan Mountains It occurs in NW trending fault fissure groups in the western contact zone of a granite porphyry(149±20 Ma),with its orebodies assuming veinlike form From the granite porphyry westward, there are three NW trending fissure groups which control three ore vein zones of the ore deposit respectively No Ⅲ vein zone lies in the granite porphyry of the endocontact zone, No Ⅱ vein zone is located in conglomerate of complex components 0～450 m west of the granite porphyry, and No Ⅰ vein zone is situated in conglomerate and sandstone of complex components 450～900 m west of the granite porphyry From No Ⅲ vein zone to No Ⅰ vein zone, the ore control structures change from minute fissures to sparse faults; correspondingly, the natural types of ore veins change from microvein zone to veinlet zone and large veins Ores tend to vary from molybdenum quartz type to cassiterite quartz type and then to cassiterite sulfides quartz type, with the corresponding variation of the useful components in order of Sn, Mo, Bi→Sn, Mo, Cu→Sn, Cu, Zn, Ag Detailed analyses of minor elements also reveal that from No Ⅲ vein zone to No Ⅰ vein zone, As, Bi, Mo gradually decrease whereas Sn, Cu, Pb, Zn, Mn, Au, Ag, Sb, progressively increase in wall rocks Field structural mapping combined with studies on assemblages of altered minerals and metallic minerals reveals that in the Maodeng ore deposit, the ore control structure had undergone more than two times of activities while alteration mineralization experienced three stages before mineralization Fluid inclusion studies also demonstrate that from east to west and from the depth to the shallow part of the ore deposit, there exists apparent temperature gradient Structural pulsation and hydrothermal pulsation were consistent with fluid evolution in time and space, which accounted for the consequent pulsation metallogenic zoning in this deposit
出处
《矿床地质》
CAS
CSCD
北大核心
1996年第4期318-329,共12页
Mineral Deposits
关键词
铜矿床
成矿分带
矿化
成因
hydrothermal vein tin copper deposit, metallogenic zoning, Maodeng deposit in Inner Mongolia
