Fluvial-style migration controls autogenic aggradation in submarine channels: Joshua Channel, eastern Gulf of Mexico

Author:

Morris Paul D.12ORCID,Sylvester Zoltán2,Covault Jacob A.2,Mohrig David1,Dunlap Dallas12

Affiliation:

1. Department of Geological Sciences Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, USA

2. Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, USA

Abstract

Abstract There has been debate over the processes acting on deep-water channels, with comparisons made to the evolution of meandering fluvial systems. We characterized a three-dimensional seismic-reflection dataset of the Joshua deep-water channel–levee system located in the eastern Gulf of Mexico and interpreted 13 horizons showing its kinematic evolution over a 25 km reach. Over this reach, we documented channel migration through systematic bend expansion and downstream translation, which was sustained through channel aggradation as sinuosity increased from 1.25 to 2.3 at abandonment. An abrupt decrease in sinuosity was associated with a neck cutoff, which changed the subsequent migration direction of the channel in that locality. These processes are analogous to the evolution of meandering fluvial systems. We show that increasing channel sinuosity correlates to a reduction in channel slope and hypothesize that this promoted increasingly depositional turbidity currents that led to channel aggradation. Using a simple forward stratigraphic model in which vertical movements of the channel are governed by a stream power law, we show how aggradation can be driven autogenically. Trends in sinuosity, aggradation and slope are in broad agreement between the Joshua Channel and the model. This highlights the potential importance of intrinsic channel processes as a control on system evolution.

Publisher

Geological Society of London

Subject

Geology,Ocean Engineering,Water Science and Technology

Reference69 articles.

1. Lateral accretion packages (LAPs): an important reservoir element in deep water sinuous channels

2. Morphology and architecture of the present canyon and channel system of the Zaire deep-sea fan

3. Sedimentary Architecture in Meanders of a Submarine Channel: Detailed Study of the Present Congo Turbidite Channel (Zaiango Project)

4. Bjerstedt T. Kramer K. and Shedd W. 2016. Latest Pleistocene ‘Blue Unit’ of the Mississippi Fan System Gulf of Mexico. GCAGS Explore & Discover Article #00098 66th Annual GCAGS Convention and 63rd Annual GCSSEPM Meeting September 18–20 2016 Corpus Christi Texas USA https://www.gcags.org/exploreanddiscover/2016/00098_bjerstedt_et_al.pdf

5. The Stratigraphic Record of Submarine-Channel Evolution

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3