新疆东昆仑西段北带古元古界浅变质岩与钨锡成矿远景

Prospect of tungsten-tin mineralization and lower Proterozoic epimetamorphic rocks in the north part of the western section of East Kunlun,Xinjiang Province

分布于白干湖一带的下元古界小庙岩组为一套由绢云石英片岩、二云片岩、大理岩等组成的浅变质岩,该地层严格受白干湖断裂的控制,分布于断裂北缘,加里东期中酸性岩浆岩侵位于该套地层。白干湖钨锡矿田即产于该套地层中,受元古界地层、昆中断裂及加里东期岩浆岩"三位一体"的控制。该矿田是祁曼塔格成矿带上的重要地质找矿成果。在吐拉一带的下元古界苦海岩群岩性组合为绢云石英片岩、绢云片岩、大理岩等,其分布范围受昆中断裂的控制,区内海西期中酸性岩浆岩广泛发育。本文通过对下元古界小庙岩组和苦海岩群、加里东期和海西期中酸性岩浆岩的岩性特征和地球化学特征分析,总结两个区内成矿背景,并结合前人对该区的研究认识及野外勘查,最终提出吐拉一带下元古界苦海岩群中具有与白干湖地区类似的钨锡成矿远景。

The lower Proterozoic Xiaomiaoyan Formation, located in the Baiganhu area, is a set of shallow metamorphic rocks which are composed of sericite quartz schist, muscovite-biotite schist and marble. The strata are strictly controlled by the Baiganhu fault and distributed in the north of the fault, and intruded by the intermediate-acidic magmatic rocks during Caledonian. Baiganhu tungsten-tin ore field that is produced in this set of strata, and controled by the Proterozoic strata, Kunzhong fault and Caledonian magmatic rocks. This ore field is an important geological prospecting result in the Qimantage metallogenic belt. In the area of Tula, the lithologic assemblage of the lower Proterozoic Kuhaiyan group is composed of sericite quartz schist, sericite schist, marble and so on. The distribution range of Kuhaiyan group is controlled by the Kunzhong fault, and the intermediate-acid magmatic rock is extensively developed in Hercynian period. Based on the analysis of the lithological and geochemical characteristics of the Xiaomiaoyan Formation and the Kuhaiyan Group, Caledonian and Hercynian magmatic magmatic rocks in the Lower Proterozoic, summarized the metallogenetic background of the two regions, combined with previous researches and field investigation in this area, and finally proposed lower Proterozoic Kuhaiyan group located in Tula area has a similar tungsten-tin metallogenic prospect like in Baiganhu area.