摘要
通过450m长的五号桩岩芯的粒度分析、粘土矿物分析、碳酸盐分析和古地磁测年,揭示了现代黄河三角洲地区上新世晚期(约距今380×10~4a)以来,经历了一个长期稳定的沉积过程,沉积了一套以河流-湖泊相为主的粉砂质粘土、粘土质粉砂和细砂沉积;晚更新世以后,局部地区受渤海海侵影响,接受海相沉积。本区沉积动力作用很弱,沉积作用主要受区域构造运动和沉积古气侯的影响;晚更新世以前,在渤海地区的海侵期间,可能海水并未进入本区。
Based on the analyses of grain size, clay minerals, carbonate and dating of paleomagnetism for the core of 450m from Wuhaozhuang, it has been revealed that the Huanghe Delta has undergone secular and stable deposition since the late Pliocene (380×10~4a) and deposited mainly the sediments of river-lake facies consisting of silty mud, muddy silt and fine-sand and a little sediments of marine facies locally affected by the transgression of the Bohai Sea during the late Pleistocene. In the area, the depositional process is essentially controlled by regional tectonic movement and paleoclimatic change because there is a weaker dynamics of deposition in the area. Before the late Pleistocene sea water could not probably transgress the area during the transgression of sea.
出处
《黄渤海海洋》
CSCD
1991年第1期33-41,共9页
Journal of Oceanography of Huanghai & Bohai Seas
关键词
黄河
三角洲地区
沉积作用
上新世
Huanghe Delta depositional process river-lake facies regional tectonic movement paleoclimatic change
