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秦岭造山带被认为是华北板块、秦岭微板块和扬子板块多期次碰撞而成的复合造山带。关于扬子板块与秦岭板块之间的勉略古缝合带的缝合时代,一直存在加里东期和印支期两种认识。在略阳县三岔子附近,原时代不明的蛇绿构造混杂岩之硅质岩夹层中,发现保存较好的早石炭世放射虫化石,表明勉略洋盆已延续到海西期。
The Qinling orogenic belt is considered as a composite orogenic belt formed by multi-period collisions of the North China Plate, the Qinling Plate and the Yangtze Plate. Concerning the sewing times of the Mianlou ancient suture between the Yangtze plate and the Qinling plate, there are two kinds of understanding about the Caledonian and Indosinian. In the siliceous intercalated layers of the ophiolite-type melanges of unknown origin in the vicinity of Sanchazi, Lueyang County, the well-preserved Early Carboniferous radiolarian fossils were found, indicating that the Mianlang Oceanic basin had been extended to the Hercynian.