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

卷:

第44卷

期数:

2022年第05期

页码:

775-788

栏目:

沉积地质与油气勘探

出版日期:

2022-09-15

文章信息/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

文章编号:

1672-6561(2022)05-0775-14

作者:

孙玉玺; 李华^*; 谈梦婷; 葛稳稳; 冯斌; 于星

(长江大学 地球科学学院,湖北 武汉 430100)

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)

关键词:

深水沉积;  交互作用;  粒度分析;  重力流;  等深流;  平凉组;  奥陶系;  鄂尔多斯盆地

Keywords:

deep-water deposition;  interaction;  grain size analysis;  gravity flow;  contour current;  Pingliang Formation;  Ordovician;  Ordos Basin

分类号:

P618.13; P512.2

DOI:

10.19814/j.jese.2022.05011

文献标志码:

A

摘要:

重力流与等深流交互作用沉积作为深水沉积研究的热点之一,仍存在鉴别标志不完善及形成机理不明确等问题。基于野外露头、粒度数据及薄片等资料,分析了鄂尔多斯盆地西南缘陇县地区奥陶系平凉组沉积类型与特征,探讨了重力流与等深流交互作用沉积形成机理。结果表明陇县地区奥陶系平凉组沉积构造较丰富,粒度参数垂向差异明显,反映了3个演化期次:①中低能改造砂沉积,岩相表现为砂泥互层,见重力流与等深流沉积特征; ②高能浊流沉积,表现为块状砂岩,见有正粒序层理等重力流沉积特征; ③低能改造砂沉积,表现为砂泥互层,见有重力流与等深流沉积特征。平凉组沉积时期,浊流与处于海槽限制性环境内向西运移的等深流进行交互作用,沉积类型及演化主要受浊流水动力强度控制。陇县地区奥陶系平凉组重力流与等深流交互作用沉积可分为2种机制:①浊流间歇期,后期等深流对早期未固结浊流沉积改造,即等深流改造重力流机制; ②浊流活跃期,同地同期在垂向空间尺度上浊流与等深流彼此影响,即等深流与重力流同时作用机制。

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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备注/Memo

备注/Memo:

收稿日期:2022-05-08; 修回日期:2022-06-07投稿网址:http:∥jese.chd.edu.cn/
基金项目:国家自然科学基金项目(42272113,42272115,41472096,41502101); 国家科技重大专项项目(2017ZX05032-002-003); 湖北省自然科学基金项目(2020CFB745); 地质资源与地质工程一流学科开放基金项目(2019KFJJ0818010)
作者简介:孙玉玺(1997-),男,满族,辽宁营口人,工学硕士研究生,E-mail:2860485642@qq.com。
*通讯作者:李 华(1984-),男,四川安岳人,副教授,工学博士,E-mail:501026@yangtzeu.edu.cn。

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更新日期/Last Update: 2022-10-01