论文部分内容阅读
都龙锡锌超大型矿床是中国第三大锡石硫化物矿床。矿区内铜矿化除主要的夕卡岩型、石英-萤石脉型外,近期的勘查工作还在曼东矿段南部揭露了燕山晚期花岗斑岩内的铜矿化,不少达到了工业要求,是该矿区内新发现的一种铜矿化类型。该类矿化以铜为主,共-伴生锡、锌等,矿体受花岗斑岩脉规模以及贯通岩脉与围岩的构造裂隙控制,具收缩膨胀、分支复合、尖灭再现等现象。成矿元素分布特征指示铜、锡等成矿物质主要来源于燕山晚期第三期岩浆活动。含矿花岗斑岩LA-ICPMS锆石U-Pb定年,获得成岩-成矿年龄为88 Ma。上述研究结果表明,该类矿化具有比较典型的岩浆热液成矿特征。与夕卡岩型、石英-萤石脉型相比,该类型铜矿化具有成因明确、找矿标志明显、空间分布范围确定的优点。曼东矿段及其周边,具有黑云母等暗色矿物含量较高、结晶程度稍差、蚀变及破碎程度较强等特点的燕山晚期花岗斑岩是有利的找矿对象。
Du Long tin zinc super-large deposits is China’s third largest Cassiterite deposit. In addition to the major skarn-type and quartz-fluorite veins, the recent exploration work in the mining area revealed the copper mineralization in the late Yanshan granite porphyry in the southern part of the Mantong ore block, many of which have reached the industrial Requirements, is a newly discovered type of copper mineralization within the mining area. This type of mineralization is dominated by copper, co-associated with tin, zinc, etc. The orebodies are controlled by the granite porphyry vein scale and the structural fissures that run through the dikes and surrounding rocks with the phenomena of shrinkage expansion, branch compounding and pinchout reproduction . The distribution of ore-forming elements indicates that the metallogenic materials such as copper and tin are mainly derived from the third stage of Yanshan magmatism. The LA-ICPMS zircon U-Pb dating of ore-bearing granite porphyries resulted in a diagenetic-mineralization age of 88 Ma. The above results show that this type of mineralization has the typical magmatic hydrothermal mineralization characteristics. Compared with skarn-type and quartz-fluorite veins, this type of copper mineralization has the advantages of definite genesis, obvious prospecting sign and definite spatial distribution range. The late Yanshan granite porphyry in the Mantong ore block and its periphery has the characteristics of high content of dark-colored minerals such as biotite, slightly less crystallized, stronger alteration and fragmentation, and is favorable prospecting target.