【作者】 李淑娟；

【导师】 周洪瑞；

【作者基本信息】 中国地质大学（北京） ， 古生物学与地层学， 2010， 硕士

【摘要】 豫西潭头盆地和汝阳盆地均位于华北板块南缘和秦岭造山带接壤地带,二者均为豫西地区中新生代红层盆地。根据本次工作获得的双壳化石和孢粉资料,结合前人发现的恐龙等化石,本文对两盆地的地层时代进行了探讨,并对沉积盆地的沉积相特征、古气候特征以及构造背景进行了研究和对比。通过研究,修订了前人对潭头盆地、汝阳盆地中-新生代地层的划分与对比方案;认为潭头盆地发育了冲积扇-扇三角洲-湖泊的粗粒-细粒沉积,具有沉积物重力流的特征,总体经历了一个湖平面上升的过程。汝阳盆地充填了一套辫状河-辫状河三角洲的沉积,为牵引流性质沉积。总体经历了一个湖平面由升-降的过程,形成了从退积-进积、不对称旋回的辫状河-辫状河三角洲沉积序列。两盆地沉积时期属干旱的热带气候,但显示出有从干旱炎热向温暖湿润转变的趋势;从构造演化、物源供给、古气候特征方面分析影响盆地发展演化的因素,认为构造因素在沉积相的控制上起着决定性作用,但气候和沉积物供应量的多少也对凹陷的充填构成重要影响。更多还原

【Abstract】 Tantou Basin and Ruyang Basin of Western Henan are located in the bordering areas of southern margin of the Northern China block and Qinling orogenic belt, both of them are red beds basins in western Henan province in Mesozoic and Cenozoic. According to the bivalves fossils and pollen data during this work, combined with the previous dinosaur and other fossils, this paper has studied and compared the stratigraphic age, the sedimentary characteristics, paleoclimate characteristics, and structural background of the two basins. Through our research, we revised the previous division and correlation of the Mesozoic and Cenozoic stratum of Tantou and Ruyang basin. Tantou basin was filled with an alluvial fan to fan delta to lake coarse-grained deposition, with a sediment gravity flow characteristic, and it experienced a Lake-level rise process. Ruyang basin filled with a braided river to braided river delta deposition, which had a nature of the traction current. The lake level generally experienced a up to down process, forming a progressive to regressive, braided to braided river delta sequence. During the deposition of the two basins, it had a arid tropical climate, but it showed a trend that from drought and heat to humid; we analyzed and compared the development of the two basins from the tectonic evolution, provenance, paleoclimate characteristics, and found that structural factors plays a decisive role in the control of the sedimentary facies, but the climate and the amount of sediment supply also had a significant impact.更多还原