青海牛苦头矿区成矿类型及矿化样式研究

牛苦头铅锌多金属矿床位于东昆仑造山带祁漫塔格地区中西段,目前已探明铅和锌金属量(推断及以上)115×10^(4)t,为祁漫塔格地区最具成矿潜力的矽卡岩型铅锌矿床之一。本次研究通过野外工作,对牛苦头M1、M4磁异常区典型矿体的样式及产状研究,总结出牛苦头矿区共有五种矿化(体)类型,其中矽卡岩型矿体和贯入式矿体是牛苦头矿山的主要矿体。结合牛苦头矿区成矿类型及矿化样式,对牛苦头铅锌多金属矿床成因模式进行了进一步的探讨,认为矽卡岩型矿体产于远离成矿岩体的大理岩与碎屑之前的硅钙面,而贯入式矿体产于靠近岩体的层间断裂之中。两类矿体的识别对于牛苦头铅锌多金属矿床成因模式的研究以及成矿规律的总结具有重要意义。

A study on metallogenic type and style in Niukutou ore district, Qinghai Province

Niukutou Pb-Zn polymetallic deposit is located in the central and western part of Qimantagh area,East Kunlun orogenic belt. At present, 1.15 million tons of Pb+Zn resources is proved, which is one of the most potential skarn type Pb-Zn deposits in Qimantagh area. Through geological field work, based on the style and occurrence of typical deposits in Niukutou M1 and M4 magnetic anomaly areas,this study summarize five kinds of mineralization in Niukutou ore district, in which skarn type ore body and penetrating type ore body are the main ore bodies of Niukutou deposit. Combined with the metallogenic type and mineralization style, the genetic model of Niukutou deposit is further discussed. It is considered that skarn type ore body occurs in the ilicon calcium surface between marble and debris far away from the metallogenic rock mass, while penetrating type ore body occurs between interlayer fractures near the metallogenic rock mass. The identification of the two types ore bodies, which is of great significance for the study of Niukutou Pb-Zn polymetallic deposit and the summary of metallogenic law.