东非鲁武马盆地海底水道—朵体体系粗粒浊流沉积物波特征及主控因素

发布时间：2018-04-10 06:39

本文选题：鲁武马盆地　切入点：水道—朵体体系　出处：《沉积学报》2017年04期

【摘要】：海底水道—朵体体系内粗粒沉积物波的研究可以深化浊流搬运过程的认识。利用先进的地球物理成像技术,通过地震地貌分析,对东非鲁武马盆地海底水道—朵体体系内这种后期易被改造的特殊沉积体进行识别和解释,结合粗粒沉积物波的形态、尺度、移动方式、厚度变化、平面分布等特征,探讨其成因和影响因素。鲁武马盆地近海底水道—朵体体系内的粗粒浊流沉积物波具有多变的地貌和逆行砂丘的底形。水道内粗粒沉积物波规模较小,分布范围局限;水道—朵体过渡带的粗粒沉积物波规模大,波高约45~110 m,波长可达一千余米,总体规模大于其他地区已识别出的粗粒深水沉积物波。构造活动、超临界流产生的水跃作用、地形地貌的变化以及底流作用是鲁武马盆地粗粒浊流沉积物波形成的主控因素。
[Abstract]:The study of coarse-grained sediment waves in submarine waterway-dolomite system can deepen the understanding of turbidity transport process.By using advanced geophysical imaging technology and seismic geomorphology analysis, this special sedimentary body in the submarine waterway and dolomite system in the Luwu Ma Basin, East Africa, is identified and interpreted, which is easy to be modified in the later stage, and combined with the shape of coarse grain sediment wave.The characteristics of scale, moving mode, thickness change and plane distribution are discussed, and the causes and influencing factors are discussed.The coarse-grained turbidite sediment waves in the subsea waterway-dolomite system in the Luwu Ma Basin are characterized by variable geomorphology and the bottom shape of retrograde sand dunes.The coarse-grained sediment waves in the channel are small in size and limited in distribution, and the coarse-grained sediment waves in the transitional zone of the channel and the dolomite have a large scale, with a wave height of about 45 ~ 110m and a wavelength of more than 1,000 meters.The overall scale is larger than the coarse sediment waves identified in other regions.Tectonic activity, water jump produced by supercritical flow, changes of topography and geomorphology and bottom flow are the main controlling factors for the formation of coarse turbidite current sediment waves in Luwu Ma Basin.
【作者单位】：中国石油杭州地质研究院;
【基金】：中国石油天然气集团公司科学研究与技术开发项目(2016D-4303)~~
【分类号】：P736.21

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