松辽大型移置体和大兴安岭隆起机制探讨

地质、地球物理和钻探资料证明,松辽盆地为前寒武古板块。然而,在中生代早侏罗纪,大兴安岭东缘和松辽构造区还是西太平洋敞开着的深海沟环境〔6〕,怎么会出现前寒武古板块呢?显然,只有大规模的板块漂移活动,才能把松辽前寒武板块移置到中生代深海沟区。所以,松辽板块是大型移置体,而大兴安岭则是松辽板块与蒙古板块(兴蒙古生代褶皱系)挤压碰撞活动的产物。

A PRELIMINARY DISCUSSION ON THE MECHANISM OF SONGLIAO LARGE-SIZE ALLOCHTHON AND DAHINGGANLING UPLIFT

Geological, geophysic and drilling data show that Songliao basin is a Precambrian paleoplate.Nevertheless, in Mesozoic Early Jurassic, the eastern margin of Da Hinggan Mountains and the Songliao tectonicarea remained in an open deep-sea trench environment in West Pacific Ocean, how could a Precambrian paleoplate occur? It is obvious that only through large-scale plate drift could Songliao Precambrian plate be transplanted to Mesozoic deep-sea trench. Therefore, Songliao plate seems to be a large-size allochthon, whereas Da Hinggan Mountains must have been produced as a result of compression and collision between Songliao plate and Mongolia plate.