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摘要:
将蒙古-鄂霍次克褶皱系的地质构造特征及其演化进程，置于古亚洲洋和滨太平洋构造域的宏观格架中加以对比研究，可以看出，蒙古-鄂霍次克构造带属于复合褶皱系.依据其主体特征，可以分为西、东两部分.西部地区，杭盖-肯特-达斡尔褶皱带的晚新元古代-晚古生代地质特征，与古亚洲洋构造域演化进程的特征类同，早中生代构造演化与古亚洲洋构造域板块汇聚后的大陆裂解有关，晚中生代叠加了大规模走滑和逆冲作用.东部地区，褶皱系的主体属于滨太平洋活动大陆边缘中生代构造演化的一部分，西段的中生代陆缘弧盆系和大型走滑断裂带叠加在古欧亚大陆板块及古生代褶皱带之上，东段的中晚侏罗-早白垩世乌达-穆尔加陆缘褶皱-逆冲带被晚白垩世的锡霍特-阿林、鄂霍次克-楚科奇大陆边缘火山岩带斜截并覆盖.
Abstract:The comparative study places the geological characteristics and evolution of Mongolia-Okhotsk fold system into the macroscopic framework of Paleo-Asian Ocean and peri-Pacific tectonic domains. It shows that the Mongolia-Okhotsk tectonic belt belongs to composite fold system. According to the main characteristics, the fold system can be divided into two parts. In the western part, the geological characteristics of Hangay-Kent-Daur fold belt in Late Neoproterozoic-Late Paleozoic are similar to the evolution characteristics of Paleo-Asian Ocean tectonic domain, with its tectonic evolution in Early Mesozoic related to the continental disintegration after the plate convergence of Paleo-Asian Ocean tectonic domain and large-scale strike slip and thrust superimposed in Late Mesozoic. While in the east, the main fold system is part of the Mesozoic tectonic evolution of peri-Pacific active continental margin, with the Mesozoic continental arc basin system and large strike-slip fault zone in its western sectiont superimposed on the paleo-Eurasia Plate and Paleozoic fold belt and the Middle Late Jurassic-Early Cretaceous Uda-Murga continental margin fold-thrust belt in its eastern section cut obliquely and covered by Late Cretaceous Sikhot-Alin and Okhotsk-Chukchi continental margin volcanic belt.
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Key words:
- Mongolia-Okhotsk /
- fold system /
- tectonic evolution /
- Paleo-Asian Ocean /
- Northeast Asia
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