古地理学报2017，Vol.19Issue(3)：433-444,12.DOI:10.7605/gdlxb.2017.03.033
河南省济源盆地下侏罗统鞍腰组重力流沉积特征及其构造意义
Sedimentary characteristics and tectonic significance of gravity flow deposits of the Lower Jurassic Anyao Formation in Jiyuan Basin, Henan Province
摘要
Abstract
On the basis of the detailed field work,the authors focus on the gravity flow deposits of the Lower Jurassic Anyao Formation of Jiyuan Basin,Henan Province.Deposits of slump,sandy debris flow and turbidity current are identified through the systematic researches on lithologic characteristics, sedimentary structures and sequences.Slump deposits are characterized by the mixed sandstones and mud-stones,sliding deformation and convolute mudstone fragments.The sandy debris flow deposits are usually of massive structures.The grains with matrix supported are poor sorted and rounded.Limestone gravels are often floating in the sandstone strata.The most common turbidity current deposits can be divided into two types:One with nomal grading beddings and the other is composed of thin interbedded sandstones and mudstones.They all can be described with the Bouma sequence.Three evolutive sequences of the gravity flow deposits are identified from the bottom to the top.Sequence A records a conversion of slump deposits into sandy debris flows,then into turbidity currents and finally into deep lacustrine deposits.Sequence B represents superimposition of sandy debris flows and turbidity currents.Sequence C is composed of turbidity currents and deep lacustrine deposits.The gravity flow deposits are controlled by the thrusting of Qinling Orogen along the Sanmenxia-Lushan-Wuyang fault during the Early Jurassic.The sedimentary evolution of the gravity flow deposits can be used to demonstrate the waning orogensis of the Qinling Orogen.关键词
济源盆地/秦岭造山带/早侏罗世/鞍腰组/重力流沉积Key words
Jiyuan Basin/Qinling Orogen/Early Jurassic/Anyao Formation/gravity flow deposit分类
天文与地球科学引用本文复制引用
杨文涛,吴蒙,杨旅涵,史飞,梁厅..河南省济源盆地下侏罗统鞍腰组重力流沉积特征及其构造意义[J].古地理学报,2017,19(3):433-444,12.基金项目
国家自然科学基金项目(编号:41440016)、河南省基础与前沿技术研究计划项目(编号:152300410211)、中国石油大学(北京)油气资源与勘探国家重点实验室开放项目(编号:PRP/open-1407)联合资助.[Co-funded by the National Natural Science Foundation of China (No.41440016),the Basic and Frontiers Research Program of Henan Province (No.152300410211)and the Foundation of State Key Laboratory of Pe-troleum Resources and Prospecting,China University of Petroleum (Beijing) (No.PRP/open-1407)] （编号:41440016）
