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
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摘要
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.
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.
引文
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[3] 南卡俄吾,贾群子,李文渊,等.青海东昆仑哈西亚图铁多金属矿区石英闪长岩LA-ICP-MS锆石U-Pb年龄和岩石地球化学特征[J].地质通报,2014(6):841-849.
[4] 陈静,谢智勇,李彬,等.东昆仑拉陵灶火钼多金属矿床含矿岩体地质地球化学特征及其成矿意义[J].地质与勘探,2013,49(5):813-824.
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[6] 张林.青海拉陵灶火地区成矿地质特征及找矿远景分析[D].北京:中国地质大学,2013.
[7] 刘国燕,赵永亮,林贵,等.东昆仑灶火河西铁多金属矿找矿前景浅析[J].矿产勘查,2017,8(4):559-567.
[8] 姜寒冰,李文渊,董福辰,等.昆中断裂带南北陆块基底、盖层沉积、岩浆岩对比研究—昆中断裂带构造意义的讨论[J].中国地质,2012,39(3):581-594.
[9] 鲁海峰,李积清,殷占虎,等.青海格尔木拉陵灶火地区矿产分布规律及找矿远景区划分[J].中国矿业,2011,20(7):66-68.