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首页> 外文会议>"现代地球科学,交流与合作"国际学术研讨会暨第六届IPACES学术年会 >Fan-Delta and Related Turbiditic Deposits on the Steep Slope of Dongying Depression, Bohai Bay Basin
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Fan-Delta and Related Turbiditic Deposits on the Steep Slope of Dongying Depression, Bohai Bay Basin

机译：渤海湾盆地东营De陷陡坡上的扇三角洲及相关的浊积沉积

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摘要

The fan-delta in the fourth member of Shahejie Formation in steep slope of Dongying depression belongs to prograded type. The proximal part of the deposit is dominated by the successive deposition of sandstone aprons with a few channel plug sandbodies produced through rapid sedimentation from channelized sediment-laden debris flows. The middle part, on the other hand, is mainly represented by the stacked channel-fills with alternate sandstone aprons. Following the deposition of bedded sandstones, as the slope of the depositional surface reduced, debris flows with relatively less grain concentration extended towards the ambient waterbody through channels incised into the preexisting unconsolidated sediments. The thick stacks of channel-fill sandbodies were developed as a consequence of vertical channel aggradation under continued hangjngwall subsidence, and the upward declining trend in vertical aggradation suggests gradual fall in the rate of this subsidence. Distal fan-delta deposits represents beds characterized by a repetition of sandstone and mudstone layers. Each stratum is thin-to medium-bedded and forms a succession with a thickness range of decimetres to several metres. The present study indicates that gravity channel and slumps formed in the prodelta region of the fan delta.
机译：在东营凹陷的陡坡陡坡沙河杰形成的第四次成员的粉丝三角洲属于促进类型。沉积物的近端部分是由砂岩围裙的连续沉积，通过从通道化沉积物碎片流动的快速沉淀产生的一些通道插头砂囊。另一方面，中间部分主要由堆叠的通道填充用交替的砂岩围裙代表。在沉积玻璃窗后，随着沉积表面的斜率减小，碎片流动朝向环境水体延伸的碎片流动通过切入预先存在的未溶结沉积物的通道延伸。由于垂直渠道沉积在持续的Hangjngwall沉降下，开发了厚堆的频道填充砂囊，并且垂直委​​员会的上行趋势表明逐渐下降了这个沉降的速度。远端风扇 - Delta沉积物代表床铺，其特征在于重复砂岩和泥岩层。每个层都是薄的中床，并形成连续的厚度范围为几米。本研究表明，在风扇三角洲的Prodelta区域中形成的重力通道和坍落度。

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