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以霸县凹陷东三段古物源体系为例,对其进行了不同角度与不同层次的精细研究,进而探讨了霸县凹陷断-坳转换期的物源体系特征及其控制因素。结果表明,霸县凹陷断-坳转换期物源特征主要受古构造与古气候的控制,表现为:一方面,受继承性裂陷末期断陷样式的影响,凹陷快速地构造沉降,使得隆凹格局明显,易于形成近源堆积;另一方面,受古气候频繁变化的影响,气候干燥时,整体处于暴露环境,加速了剥蚀速度,气候潮湿时,沉积范围扩大,加速了凹陷填平补齐,准平原化。在古构造和古气候双重因素控制下,形成了霸县凹陷断-坳转换期独特的物源特征,表现为以凹陷边缘凸起为主的近物源慢速堆积特征。综合多种物源分析方法,得出研究区物源来自东部的大城凸起和西部的牛驼镇凸起,具体包括东部的长丰镇物源;史各庄物源和苏桥物源;西部的鄚州物源和岔河集物源;南部的饶阳物源和北部的南孟物源。在物源体系、构造组合特征及气候的控制下,东三段主要发育扇三角洲和浅水三角洲沉积体系。
Taking the Paleozoic source system in the third member of the Paxian Depression as an example, the authors made detailed studies at different angles and at different levels, and then discussed the characteristics of source systems and their controlling factors during the faulted-down transition in the Paxian Sag. The results show that the source characteristics of the Fa-Au transitional period in the Baxian sag are mainly controlled by palaeotectonics and paleoclimate. The results show that on the one hand, due to the influence of the late faulting pattern of the inherited rift, On the other hand, influenced by the frequent change of paleoclimate, when the climate is dry, it is in an exposed environment as a whole, accelerating the rate of denudation, and when the climate is wet, the scope of deposition is widened to speed up the fill-in of the sag Qi, quasi-plain. Under the dual control of palaeoclimate and palaeoclimate, the unique source characteristics of the Fa-Nu depression transition in the Paxian Sag have been formed, which is characterized by the slow accumulation of near-provenance mainly in the marginal areas of the depression. Based on a variety of provenance analysis methods, it is concluded that the source of the study area is from the uplift of the Ayutthaya in the east and the uplift of the Niupo in the west, including the source of Changfeng town in the east, the source of Shicangzhuang and the source of the Suqiao, The source of Zhuozhou and Chahejiu provenance, the southern Raoyang source and the northern Mengnan source. Under the control of the provenance system, tectonic assemblage and climate, the East Third Member mainly develops fan delta and shallow water delta sedimentary systems.