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近年来,我队在燕子砭火山岩地区工作,有机会在刘家坪铜矿原勘探工作基础上,又作了一些补充工作,获得了一些资料,经初步综合整理,对区内火山岩系及刘家坪铜矿地质特征有不同认识,由我队唐子林同志执笔,加以介绍,供大家讨论。一、区域地质概况本区位于杨子准地台龙门—大巴山前缘坳陷带之西北缘,北以汉江深断裂为界,与昆仑秦岭地槽南秦岭加里东褶皱带毗邻。南秦岭加里东褶皱带为碧口群海相绿色变质火山岩系,以紧密线状褶皱为其特征。龙门山—大巴山前缘坳陷带出露地层为下古生界浅海碎屑岩沉积。构成一轴向北东,两端紧闭之背斜构造。背斜核部有火山岩及花岗闪长岩出露。
In recent years, our team has worked in the Swallow Rock volcanic area. Based on the original exploration work of the Liujiaping copper mine, we also made some supplementary work and got some information. After initial preliminary review, the volcanic rock series and the Liujiaping copper mine Geological characteristics have different understanding, Comrade Tang Zailin from my team wrote, to be introduced for discussion. I. Regional Geological Profile The area is located in the northwestern margin of the foreland margin of the Longmen-Daba Mountains in the Yangzi quasi platform, bordered by the deep Hanjiang fault in the north and adjacent to the Caledonian fold belt in the southern Qinling Gorge of the Kunlun Mountains. The Caledonian fold belt in the South Qinling is a marine metamorphic volcanic series of the Bikou Group, characterized by tight linear fold. Longmenshan - Daba mountain front depression with exposed strata of Lower Paleozoic shallow marine clastic sediments. Constitute an axial northeast, closed at both ends of the anticline structure. There are volcanic rocks and granodiorites in the anticline core.