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 mudstones,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.
Fund:[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 Petroleum Resources and Prospecting,China University of Petroleum(Beijing)(No.PRP/open-1407)]
About author: Yang Wentao,born in 1984,Ph.D.,is a lecturer of Institute of Resources and Environment,Henan Polytechnic University. He is currently engaged in the researches of sedimentology and geology of orogenic belt. E-mail: ywtao125@163.com.
Cite this article:
. Sedimentary characteristics and tectonic significance of gravity flow deposits of the Lower Jurassic Anyao Formation in Jiyuan Basin,Henan Province[J]. JOPC, 2017, 19(3): 433-444.
. Sedimentary characteristics and tectonic significance of gravity flow deposits of the Lower Jurassic Anyao Formation in Jiyuan Basin,Henan Province[J]. JOPC, 2017, 19(3): 433-444.
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