煤田地质与勘探2016，Vol.44Issue(3)：1-9,9.DOI:10.3969/j.issn.1001-1986.2016.03.001
珠江口盆地白云凹陷晚渐新统-早中新统沉积特征及演化规律
Sedimentary characteristic and evolution of Late Oligocene to Early Miocene in Baiyun depression,Pearl River mouth basin
摘要
Abstract
Based on the studies of cores, well logs, seismic and paleontology data of Baiyun depression in Pearl River mouth basin, combined with previous research results, the paper synthetically analyzed the characteristics of sedimentary facies and evolution of sedimentary filling from Late Oligocene to Early Miocene in the depression. The results show that shallow delta deposition developed in Lower Zhuhai Formation, seismic reflection character-istics show that the delta has three phases, microfacies of underwater branching channel, inter-tributary bar,river mouth bar, distal bar were drilled, characterized by sand-rich sediments, washing-filling structure, graded bedding, thick horizontal burrows and other structures were developed. The upper of Zhuhai Formation was of neritic facies, characterized mainly by marine interbedded sandstone and mudstone.At that time the shelf slope–break zone was located on the southern slope of Baiyun depression. The eustatic cycles of sea level were frequent and the shelf slope–break zone moved to the northern slope of Baiyun depression during deposition of Zhujiang Formation. As the expansion of the ancient Pearl River, the input of sediment increased and a deep-water fan sedimentary system developed in Lower Zhujiang Formation.Sediments consisted mainly of fine sandstone to coarse sandstone, with a small quantity of siltstone and deep–sea mudstone. Four major gravity flows developed, including particle flow, liquid flow, turbidity flow and debris flow. Channel deposits of inner fan, deposits of abandoned channel of middle fan, overflow deposits between the channels and deep–sea sediments outside fan were drilled. The Upper Zhujiang Formation was of bathyal facies with abyssal mudstone as major sediments.关键词
白云凹陷/深水区/珠海组/珠江组/动藻迹/沉积演化Key words
Baiyun depression/deep-water/Zhuhai Formation/Zhujiang Formation/moving algae track/sedimen-tary evolution分类
矿业与冶金引用本文复制引用
徐勇,陈国俊,马明,李超,张功成,吕成福,沈怀磊..珠江口盆地白云凹陷晚渐新统-早中新统沉积特征及演化规律[J].煤田地质与勘探,2016,44(3):1-9,9.基金项目
国家科技重大专项课题（2011ZX05025-006）@@@@National Science and Technology Major Project (2011ZX05025-006) （2011ZX05025-006）
