野外判定岩浆岩地区逆冲推覆构造的主要标志是逆冲叠瓦扇和软弱滑动层的存在。
The imbricate fan of thrusts and soft layer are main structure features distinguishing thrust-nappe structure in magma-tic body area.
研究表明，从二叠纪到侏罗纪构造活动逐渐减弱，扇体规模逐渐变小；
Tectonic activities attenuated gradually from Permian to Jurassic and the sizes of fans decreased gradually.
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