【作者】 石春磊；

【导师】 彭向东；

【作者基本信息】 吉林大学 ， 古生物学与地层学， 2008， 硕士

【摘要】 本文在野外地质调查和前人资料的综合分析对比基础上,对延吉盆地的岩石地层序列、生物地层特征做了详细总结,并对各组时代归属进行了讨论;将延吉盆地白垩纪地层与松辽盆地、鸡西盆地进行对比,提出延吉盆地上下白垩统界线应置于大拉子组之顶;并对延吉盆地的白垩纪岩相古地理进行分析,认为延吉盆地早白垩世为温暖潮湿气候条件下的一套河湖相、泥炭沼泽相夹火山碎屑岩沉积,晚白垩世干旱气候条件下的河流相红色粗碎屑岩沉积;在系统查证延吉盆地各断裂的基本特征基础上,提出延吉盆地并没有单独的控盆断裂,其构造分区为两隆两坳;并将延吉盆地演化分为两个盆地演化旋回,确立延吉盆地为早白垩世断陷盆地和晚白垩世坳陷盆地叠加的复合盆地性质。更多还原

【Abstract】 Yanbian region located in the junction parts of Paleao-Asian Ocean tectonic domain and Pacific tectonic domain, it belongs to the eastern parts of Xinan-Mongolia Orogenic belt and an important composition of Mesozoic volcanic belt circling west Pacific ocean. The main strata of Yanji Basin are composed of Cretaceous, it has clearly two basin evolution stages, namely: the early Cretaceous rifting basin stage and the late Cretaceous depression basin stage.Based on systematically geological survey and comprehensively analyzing and comparing the previous data, the author discussed the rock strata sequences of Yanji basin, biostratigraphic characteristics and regional comparison, and then analyzed its litho-palaeogeography and discussed its basin evolution cycle. The scientific achievements as follow:1. Summarized each of the Cretaceous litho-stratigraphic units of Yanji Basin, and rectified its standards, and then established the strata sequences of Yanji Basin.2. Through comprehensive isotopic chronologic and biostratigraphic discussions, the age of the Tuntianying formation of Yanji Basin is amended from the middle Jurassic to early Cretaceous.3. Through analyzing the typical elements of Dalazi Fauna, and after discussing its evolution sequence with the Jehol Fauna and the Songhuajiang Fauna, it is clear that the Dalazi Fauna is a transitional fauna between the Jehol Fauna and the Songhuajiang Fauna, and its age should be late Early Cretaceous. 4. After discussing the Cretaceous lithostratigraphic sequence of Yanji basin and its evolution of litho-paleaogeography, the author reckons that the Yanji basin in early Cretaceous is a set of stream facies, lacustrine facies, and peat facies with volcanic pyroclastic rocks deposition, however, the late Cretaceous is stream facies red coarse grain clastic deposition under dry climate condition.5. The author proposes that the Yanji basin should not be independent controlling basin faults, and its tectonic division is two uplifts and two depressions, and divides the Yanji basin evolution into two cycles, namely early Cretaceous rift basin and late Cretaceous depression basin.更多还原