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Sedimentary Characteristics and Evolution of Interaction Between Gravity Flow and Contour Current—A Case Study of Ordovician Pingliang Formation in the Southwest Margin of Ordos Basin, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2022年第05期
Page:
775-788
Research Field:
沉积地质与油气勘探
Publishing date:

Info

Title:
Sedimentary Characteristics and Evolution of Interaction Between Gravity Flow and Contour Current—A Case Study of Ordovician Pingliang Formation in the Southwest Margin of Ordos Basin, China
Author(s):
SUN Yu-xi;  LI Hua*;  TAN Meng-ting;  GE Wen-wen;  FENG Bin;  YU Xing
(School of Geosciences, Yangtze University, Wuhan 430100, Hubei, China)
Keywords:
deep-water deposition;  interaction;  grain size analysis;  gravity flow;  contour current;  Pingliang Formation;  Ordovician;  Ordos Basin
PACS:
P618.13; P512.2
DOI:
10.19814/j.jese.2022.05011
Abstract:
As one of the hotspots in the research of deep-water sedimentation, there are still some problems, such as imperfect identification marks and unclear formation mechanism. Therefore, based on the field outcrop, grain size and thin section data, the sedimentary types and characteristics of Ordovician Pingliang Formation in Longxian area, the southwest margin of Ordos Basin were analyzed, and the formation mechanism of the interaction between gravity flow and contour current was discussed. The results show that Ordovician Pingliang Formation in Longxian area has abundant sedimentary structures and obvious vertical variation of grain size parameters, which reflects three evolution stages. The stages are as following: ① medium and low energy reworked sands, the lithofacies is sand mud interbedding with the sedimentary characteristics of gravity flow and contour current; ② high energy turbidites, the lithofacies is massive sandstone with the sedimentary characteristics of normal grain sequence bedding and other gravity flow; ③ low energy reworked sands, the lithofacies is sand mud interbedding with the sedimentary characteristics of gravity flow and contour current. During the sedimentary period of Pingliang Formation, turbidity current is interacted with westward migrating contour current in the restricted environment of the trough, and the type and evolution of the interaction sedimentation are controlled by the dynamic intensity of turbidity. Based on the sedimentary types and characteristics, it is considered that the deep-water interaction sedimentation of Ordovician Pingliang Formation in Longxian area can be divided into two types of mechanism, as following: ① contour current reworking gravity flow mechanism, when the turbidity is intermittent, the early unconsolidated turbidites is reworked by the later contour current; ② contemporaneous contour current and gravity flow mechanism, when the turbidity is active, the turbidity current and contour current affect each other at the same time and at the same place in the vertical space scale.

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Last Update: 2022-10-01