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内蒙古东部嵯岗地区位于大兴安岭西北缘,额尔古纳地块的东部,其构造变形特征和隆升机制的研究相对薄弱。通过对嵯岗剖面的野外地质考察和显微组构研究表明,嵯岗杂岩整体反映向北西的伸展滑脱构造,结合Fry法对岩石进行有限应变测量以及Flinn图解判断出嵯岗杂岩伸展构造的应变类型主体为拉长型剪切应变。综合区域地质资料研究初步认为嵯岗地区的伸展构造成因可能与中、晚侏罗世东北地区大范围的壳-幔相互作用,产生软流圈上隆,导致大兴安岭隆起有关。
The Konggong area in the eastern part of Inner Mongolia is located in the northwestern margin of the Greater Xing’an Mountains and the eastern part of the Erguna massif. Its tectonic deformation characteristics and uplift mechanism are relatively weak. Based on the field geological survey and microstructure study of the Yigang section, it is shown that the Yogang complex reflects the extensional and slippage structures to the northwest in general, and the Fry method is used to measure the rocks with finite strain and the Flinn diagram to determine the extensional structure of the Yigang complex The main strain type is elongated shear strain. The comprehensive regional geological data suggest that the extensional structure of the Yungang area may be related to the extensive crust-mantle interaction in the northeastern Middle and Late Jurassic, resulting in asthenospheric uplift and the uplift of the Greater Hinggan Mountains.