华北板块北缘东段古生代沉积特征及盆地演化研究进展

通过对吉林伊通、长春、永吉、桦甸等野外实地考察,结合前人研究成果,总结华北板块与西伯利亚板块碰撞拼贴方式、古亚洲洋南支洋闭合过程以及华北板块北缘沉积特征与盆地演化。研究区地质构造错综复杂,沉积体系保存不全;受中新生代构造的影响,叠加了中新生代构造变形、岩浆活动和成矿作用;地层被破坏,多为哑地层,上述原因导致对古亚洲洋闭合之前盆地的性质及演化认识不一,制约了对有关重要科学问题的深入研究。采用沉积学的方法,结合构造地质学、地球化学、古生物地层学、同位素测年等理论和方法,依据现存古生代地层和不同构造部位的沉积盆地类型及其基本特征,开展古生代构造古地理演化研究,恢复沟弧盆体系的分布以及岛弧的类型、时代,探讨古亚洲洋的闭合过程,将是探讨华北板块北缘东段构造演化特征的新思路。

Advances of Sedimentary Characteristics and Basin Evolution of Paleozoic in the North Eastern Margin of the North China Block

The paper surveyed the historical study of the collision of the Siberian plate and the north China plate, the closure of south Paleo-Asian Ocean and the sedimentary characters and basin evolution in the north margin of north China plate based on field data in Yitong, Changchun,Yongji and Huadian city of Jilin Province. The Structures of the area were found to be complicated and the sedimentary system incomplete, both of which baffled further research. Accordingly, a new research thought was proposed to explore the structural evolution features of the eastern of the northern margin of the North China plate, to restore the distribution of the trench arc basin system and the types and epoches of the arcs, and to discuss the closure process of the Paleoasian. This involves the comprehensive use of sedimentology, structural geology, geochemistry, palaeobiology and stratigraphy, isotopic dating, the research of lithofacies and paleogeography as well as structural paleogeography evolution in the Paleozoic in the central Jilin.