Skip to Main Content
GEOREF RECORD

Critical differences in sediment delivery and partitioning between marine and lacustrine basins; a comparison of marine and lacustrine aggradational to progradational clinothem pairs

Gong Chenglin, Orsolya Sztano, Ronald J. Steel, Benzhong Xian, William E. Galloway and Gabor Bada
Critical differences in sediment delivery and partitioning between marine and lacustrine basins; a comparison of marine and lacustrine aggradational to progradational clinothem pairs
Geological Society of America Bulletin (November 2018) 131 (5-6): 766-781

Abstract

Twenty-seven marine and 23 lacustrine clinothem pairs were recognized and analyzed in Qiongdongnan Basin and Pannonian Basin, respectively. A comparison of their architecture highlighted some critical differences in sediment delivery and partitioning between the marine and closed lacustrine basins. In marine Qiongdongnan Basin, rising but forward-moving shelf-edge trajectories and clinoforms with a height of hundreds of meters commonly link downdip to absent or limited sandy bottomsets, whereas the opposite occurs in the lacustrine Pannonian Basin, where very thick bottomsets developed in front of highly aggradational clinoforms. A further comparison of strongly progradational clinothem sets with fairly flat shelf-edge trajectories suggests that relatively thick versus thin or absent sandy bottomsets occur in the marine and lacustrine settings, respectively. The main reason for this marked contrast in sediment partitioning across marine versus lacustrine clinoforms is climate, where a wet-dry climate model needs to be used to explain sediment dispersal to the floor of deep Lake Pannon. During the humid half-cycle, catchment precipitation and sediment flux into Lake Pannon were probably high, and coeval lake-level rise and reduced salinity likely increased shelf accommodation and caused topset aggradation of the forward-moving clinothems. This, in turn, resulted in enhanced hyperpycnal flows and thick bottomsets on the lake-basin floor. During the semiarid half-cycle, lake level was fairly stable, and both the catchment precipitation and sediment flux into Lake Pannon were probably reduced, causing some increase in the salinity, less frequent hyperpycnal flows, and resultant short downlapping clinothems lacking or with only thin bottomsets. Critical differences in sediment delivery and partitioning between marine and lacustrine basins, as highlighted by a comparison of aggradational to progradational clinothem pairs documented herein, draw attention to the pitfall of mechanically applying conventional marine sequence stratigraphy to lacustrine basins.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 131
Serial Issue: 5-6
Title: Critical differences in sediment delivery and partitioning between marine and lacustrine basins; a comparison of marine and lacustrine aggradational to progradational clinothem pairs
Affiliation: China University of Petroleum-Beijing, State Key Laboratory of Petroleum Resources and Prospecting, Beijing, China
Pages: 766-781
Published: 20181127
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 56
Accession Number: 2019-007054
Categories: StratigraphyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2018340
Illustration Description: illus. incl. sects., sketch maps
N17°00'00" - N20°00'00", E110°00'00" - E112°00'00"
Secondary Affiliation: Eotvos Lorand University, HUN, HungaryUniversity of Texas at Austin, USA, United StatesTXM Oil and Gas Exploration, HUN, Hungary
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201906
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal