Rivière粒度资料解释法在孟加拉深水扇积物流体动力分析中的应用  

THE APPLICATION OF THE REVIERE GRANULOMETRIC METHOD TO THE ANALYSIS OF THE FINE SEDIMENTS OF THE BENGAL DEEP-WATER FAN

作　　者：方念乔[1] 

机构地区：[1]中国地质大学

出　　处：《地质论评》1992年第4期344-351,共8页Geological Review

摘　　要：Rivière粒度资料解释法以数学方法模拟实测粒度累积曲线、并援用若干曲线特征参数判别沉积物形成的流体动力条件,是独树一帜且甚有成效的环境分析方法之一。孟加拉深水扇细粒沉积物经此方法检验,表明半远海环境构成了该深水扇的沉积背景,在此背景下,穿插有低密度阵发性浊流的直接生成物或出现沉积物受等深流的局部改造。总体能量较弱的流体动力环境有利于该地区正常地层记录的保存。Homogeneous silty and clay sediments occupy a decisive position in the distalenvironments of the Bengal Deep--water Fan.Using the Reviere granulometric tech-nique wich can play a salient and practical role in interpreting the hydrodynamicmechanisms of varied sedimentations, the author sums up in this paper some faciescharacteristics of the fine-grained sediments cored from the distal regions of theBengal fan. It seems that terrigenous hemipelagites deposited by slow verticalsetting constitute the background of the sedimentary sequence and that fine--grain-ed turbidites and contourites, as secondary constituents, lie scattered in the seq-uence. By and large all those three deep-sea sedimentary facies resulted from theweak hydrodynamic environment and do not make an evident disturbance to thenormal stratigraphic records in the regions under study. Results of grain--size ana-lysis and other technical data concerning the sediments indicate the occurrencefrequency of the turbidite and contourite layers is related to the geographical loca-tion of the cores and particularly to the climatic evolution since the Late Quater-nary.

关 键 词：深水扇 细粒 沉积物 流体动力 

分 类 号：P512.2[天文地球—地质学]