济阳坳陷下第三系陡岸沉积模式

济阳坳陷下第三系沉积时构造运动以断陷为主要特征,在其陡岸形成了以近物源、重力流为主的沉积体系,不同的陡岸类型控制了沉积体系的发育与展布。本文在研究济阳坳陷的陡岸沉积特征的基础上归纳提出了断蚀陡岸沉积模式、间歇陡岸沉积模式和持续陡岸沉积模式三种主要类型.

Depositional Models on the Steep Slope of Paleogene, Jiyang Su b-basin

The tectonic movement of Jiyang Sub-basin in Early Tertiary is mainly characte ri zed by faulting-depressing. The depositional system，which were dominated by p rox imal gravity flow,is developed along the steep slope of Jiyang Sub-basin, and i t's de velopment and distribution are controlled by the types of steep slopes. In this p aper, based on the depositional characteristics, depositional models of steep slope sedimentation are concluded as 3 types-steep slope on th e depositional eroded fault,slope model interim steep slope and continuous steep slope. The common depositional characteristics on steep slopes are that the near s hore subaqueous fan is widely developed and it's developed degree has close rela tion to the fault throw and active time. The depositional types on steep slope s are controlled by the activities and developing characteristics of faults, and different depositional types have developed in different deposition systems and vertical evolution successions. The evolution law of deposition on steep slope is that: alluvial fan→fan-delta→delta, nearshore subaqueous fan→sublacustrine fan.