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Growth styles of shelf-margin clinoforms; prediction of sand- and sediment-budget partitioning into and across the shelf

Gong Chenglin, Wang Yingmin, Ronald J. Steel, Cornel Olariu, Xu Qiang, Xiangnan Liu and Zhao Qianhui
Growth styles of shelf-margin clinoforms; prediction of sand- and sediment-budget partitioning into and across the shelf
Journal of Sedimentary Research (March 2015) 85 (3): 209-229

Abstract

Growth styles of shelf-margin clinoforms are reliable but understudied predictors of sand- and sediment-budget partitioning into and across the shelf. Three discrete clinoform-growth styles were recognized, including (1) strongly progradational shelf-margin clinoforms with low growth-trajectory angles (G (sub ct) ), low aggradation to progradation ratios (A/P), low clinoform heights (H (sub c) ), and long clinoform length (L (sub c) ); (2) mixed progradational and aggradational shelf-margin clinoforms with moderate G (sub ct) , moderate A/P, intermediate H (sub c) , and moderate L (sub c) ; and (3) strongly aggradational clinoforms with high G (sub ct) , high A/P, high H (sub c) , and short L (sub c) . In the South China Sea dataset considered, strongly progradational shelf-margin clinoforms exhibit flat progradational and at times a mildly aggrading stacking patterns, whereas mixed progradational and aggradational clinoforms display stacking patterns with significant progradation and aggradation. Strongly aggradational shelf-margin clinoforms are dominated by aggradational stacking patterns. Each clinoform-growth style therefore represents a specific stratal stacking pattern, providing an important tool for approaching a model-independent methodology in sequence stratigraphy. In the study dataset, strongly progradational and strongly aggradational shelf-margin clinoforms are fronted by sand-prone submarine fan systems with high sand-shale ratios and mud-dominated mass-transport systems with low sand-shale ratios, respectively. Mixed progradational and aggradational clinoforms are associated with mixed sand-mud submarine canyon systems with moderate sand-shale ratios. Additionally, strongly progradational clinoforms partitioned great volumes of sediment into deep-water areas, as reflected by high rates of shelf-edge progradation and apparent toplap. Strongly aggradational clinoforms, in contrast, stored great volumes of sediment on the shelf itself, as indicated by high rates of shelf-edge aggradation and very thick clinoform topsets. G (sub ct) and H (sub c) therefore increase linearly with sediment volumes partitioned into the shelf, but decrease linearly with sand- and sediment-budget partitioning into deep-water areas, given a constant sediment-supply condition. Growth styles of shelf-margin clinoforms are thus good predictors of source-to-sink sand- and sediment-volume partitioning into and across the shelf, assisting greatly in developing a more dynamic stratigraphy.


ISSN: 1527-1404
EISSN: 1938-3681
Serial Title: Journal of Sedimentary Research
Serial Volume: 85
Serial Issue: 3
Title: Growth styles of shelf-margin clinoforms; prediction of sand- and sediment-budget partitioning into and across the shelf
Affiliation: China University of Petroleum, State Key Laboratory of Petroleum Resources and Prospecting, Beijing, China
Pages: 209-229
Published: 201503
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 35
Accession Number: 2015-032317
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 3 tables, sketch maps
N16°00'00" - N22°00'00", E102°00'00" - E114°00'00"
Secondary Affiliation: University of Texas at Austin, USA, United StatesChina National Offshore Oil Corporation, CHN, ChinaImperial College, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 201515
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