青海省灶火河西铁多金属矿成矿地质特征及找矿前景分析

Features and Potential Analysis of Iron Polymentallic Deposits in Western Zaohuohe Area,Qinhai

灶火河西铁多金属矿地处东昆仑中岩浆弧带与祁漫塔格结合带,该矿床是近些年新发现的一处铁多金属矿,矿体主要赋存于花岗闪长岩与碳酸盐岩的外接触带上,少部分产出于岩体与围岩的内接触带以及破碎蚀变带中,含矿围岩为古元古界金水口岩群。通过对含矿围岩和含矿岩体岩石薄片镜下特征及主要成矿元素特征值分析,结合研究区近几年钻探资料,认为古元古代金水口岩群所处构造部位对成矿有利,在其演化过程中,地层中的黑云斜长片麻岩、黑云角闪片麻岩、黑云石英片岩、大理岩夹斜长角闪岩可为矽卡岩的形成提供一定的物源,二长花岗岩和花岗闪长岩中成矿元素含量偏高,也为成矿作用提供了物质来源,该矿床成因类型主要为矽卡岩型或接触交代型,该区具有较好的找矿前景。

The western Zaohuohe iron polymetallic deposit discovered in recent years is located in eastern Kunlun magmatic arc belt and Qimantage tectonic belt. It mainly occurs in the outer contact zones of granodiorite and carbonate rock. A small part occurs in the inner contact zones which is between contact zone and fractured alteration zone. The ore bearing host rock is Proterozoic Jinshuikou group. In this paper, through the characteristics and main element eigenvalue analysis of ore bearing surrounding in combining with drilling data in recent years, it is believed that the tectonic sites of Proterozoic Jinshuikou group formation is conducive to the mineralization. And in the process of mineralization, including biotite plagioclase gneiss, biotite hornblende gneiss, biotite quartz schist, marble clip amphibolite in stratum can all provide a certain source for the formation of skarn. Especially, monzonitic granite and granodiorite, which have high content of ore-forming elements, can provide a mineral source of mineralization. The main genetic type of ore deposit is skarn type or contact metasomatism. We think that this place will have a great prospecting potential.