新疆托帕铜铅锌矿床地质特征及找矿标志

托帕铜铅锌矿床位于塔里木盆地西缘乌拉根成矿带东端,其矿床地质及地球物理、地球化学特征的总结可为区域上同类型矿床的找矿勘查工作提供重要参考。托帕铜铅锌矿区矿体赋存于下白垩统克孜勒苏群及其上覆始新统卡拉塔尔组中,矿体主要呈层状产出。矿石矿物主要为方铅矿和孔雀石,次要为白铁矿、闪锌矿、黄铁矿、辉铜矿并可见少量的黄铜矿和斑铜矿,主要发育晶粒结构、交代结构和条带状、浸染状构造。围岩蚀变以褪色化、黄铁矿化、孔雀石化和碳酸盐化为主。以Pb-Zn-Cd-Ag-W-Mo-Sr和Cu-PbZn-Ag-As-Sb为元素组合的综合异常及激电高极化率异常区是矿体赋存地段特征的地球物理和地球化学特征。矿体成因与盆地卤水成矿作用有关,与区域上同类矿床相比,其成矿以Cu、Pb为主可能与基底建造/物源区的不同有关。

Geological Characteristics and Prospecting Indicator of the Tuopa Copper-Lead-Zinc Deposit in Xinjiang

The Tuopa Cu-Pb-Zn deposit is located in the east part of the Wulagen metallogenic belt at the western Tarim region. Its geological, geophysical and geochemical characteristics were summarized in this paper and this will provide important reference for regional prospecting and exploration of the same type deposit. The lead-zinc and copper ore bodies of Tuopa Cu-Pb-Zn deposit are controlled by the lower part of the CretacicKezileisu Formation and the lower part of the Eocene Kalataer Formation. The ore bodies are stratiform and contain mainly galena and malachite with minor pyrite, sphalerite, pyrite, pyrocopite and a small number of chalcopyrite and porphyry. Grain structure and metasomatic structure and banded and disseminated structure are mainly developed in the ores. Wall rock alterations such as fading, ferritization, pyritization, malachiteion and carbonization are well developed; the element associations of anomalies of Pb-Zn-Cd-Ag-W-Mo-Sr and Cu-Pb-Zn-Ag-As-Sb together with the IP high polarizability anomaly region are the best indications to where the ore bodies are preserved. The Tuopa Cu-Pb-Zn deposit is related to the brine mineralization. In comparison with other deposits in the region, the mineralization of Cu and Pb may be related to the di.erence of basement formation/ source area.