| 蒙古—鄂霍茨克构造带中段构造变形及动力学特征 |
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| 关键词:Mongolia-Okhotsk collisional belt ductile deformation brittle deformation stress field East Asian multi-direction convergence Mongolian |
| 基金项目:国家专项“深部探测与实验研究”(编号: SinoProbe-08-01) |
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| Tectonic Deformation and Dynamic Characteristics of the Middle Part of the Mongolia–Okhotsk Collisional Belt, Mongolia |
| As an important part of the Central Asian Orogenic Belt, the Mongolia–Okhotsk collisional belt has attracted much attention for its tectonic deformation and dynamic characteristics. Along the middle part of the Mongolia–Okhotsk collisional belt, five ductile deformation sites and a brittle deformation site were analyzed to reveal its tectonic deformation and dynamic features. B style fold, crumple structure, A style fold, mineral stretching lineation and S-C fabric indicate NW–SE shearing. This information reveals that might have existed a large collision or multi-periodic collisions in the same direction, which resulted in the formation of the Mongolia–Okhotsk collisional belt. The forming time and global tectonic settings as well as the dynamic origin of the Mongolia–Okhotsk collisional belt were discussed. This tectonic belt was mainly formed during the middle Jurassic-early Cretaceous period under the tectonic setting of the East Asian multi-direction convergence. The brittle deformation of Site mg6 was analyzed and two paleo-stress fields were restored, i.e., the NW–SE compression stress field and the E–W compression stress field. The NW–SE compression stress field might have resulted from the distant effect of the westward subduction of the Paleo-Pacific plate during the Jurassic and Cretaceous, whereas the E–W compression stress field probably resulted from the distant effect of the India-Asia collision during the early Cenozoic. |
| HUANG Shi-qi,DONG Shu-wen,ZHANG Fu-qin,MIAO Lai-cheng,ZHU Ming-shuai.2014.Tectonic Deformation and Dynamic Characteristics of the Middle Part of the Mongolia–Okhotsk Collisional Belt, Mongolia[J].Acta Geoscientica Sinica,35(4):415-424. |
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