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延边北部火山岩型金矿带,位于内蒙——兴安华力西期褶皱带汪清——珲春燕山期内陆断陷盆地内,与晚侏罗世形成的一套火山岩密切伴生。矿带、矿田、矿体等都明显地受构造——火山构造和火山构造的控制。一、基底主要构造特点基底由一套古生界变质岩和华力西期岩浆岩所组成(图1)。其中变质岩层,组成一个以小西南岔——四道沟一带青龙村群为核部的近南北的复式褶皱带,出露在区内复背斜西翼的是一套二叠系浅变质岩层。由于后期构造——岩浆活动的破坏和改造,复背斜的面貌已十分不清,但尚可依据岩层出露、岩层间的关系和产状等情况,辨认出银河洞、十里坪、西大坡、小西南岔等几个主要的正常和倒转的背、向斜褶曲。
The northern Yanbian volcanic gold belt is located in the inland rift basin of the Wangqing-Hunchun Yanshan Period of the Inner Mongolia-Xing’an Harisi fold belt and is closely associated with a volcanic rock formed in the Late Jurassic. Ore belts, ore fields, ore bodies and so on are all obviously controlled by volcanoes and tectonics. First, the main structural features of the basement of the basement by a set of Paleozoic metamorphic rocks and the Variscan magmatic rocks (Figure 1). Among them, metamorphic strata form a subfault zone near the north and south with the Qinglongcun Group in the Xiaoxi-Nancha-Sidaogou zone and a series of Permian metamorphic rocks exposed in the western anticline of the anticlinorium anticline. . Because of the post-tectonic-magma activity destruction and transformation, the appearance of the anticlinorium has been very unclear, but it is still possible to identify the Yinhe Cave, Shiliuping, Xida Slope, small Southwest fork and several other major normal and inverted back and oblique folds.