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Experimental studies of gas-escape and water-escape structures; mechanisms and morphologies

Shannon E. Frey, Murray K. Gingras and Shahin E. Dashtgard
Experimental studies of gas-escape and water-escape structures; mechanisms and morphologies
Journal of Sedimentary Research (November 2009) 79 (11): 808-816

Abstract

Water-escape and gas-escape structures were generated in the laboratory to assess variations in deformational structures generated during these events. Particulate fluidization was observed to be the method by which grains were redistributed during water escape. Resulting structures of particulate fluidization comprised disrupted and downward-deflected primary laminations, and a massive-appearing column of sand above the point source. Gas experiments, with a low flow rate (6.167X10 (super -6) m (super 3) /s) allowed gas to disperse through fractures, and only subtle deformation was achieved. Aggregative fluidization (i.e., fluid movement through sediment as bubbles) was the mechanism for grain displacement during gas escape. With increased flow rate (7.67X10 (super -5) m (super 3) /s) aggregative fluidization occurred and particles were carried upward in the wake of the passing gas bubble. Aggregative fluidization resulted in broken, upwards-warping laminations and convoluted bedding. Experiments illustrate a significant morphological difference between water escape and gas escape. Water-escape structures were bounded by downwards-warping laminations, consistent with water-escape structures encountered in the rock record. Gas-escape structures displayed upwards-warping laminations, and could represent a formation mechanism for convolute bedding.


ISSN: 1527-1404
EISSN: 1938-3681
Serial Title: Journal of Sedimentary Research
Serial Volume: 79
Serial Issue: 11
Title: Experimental studies of gas-escape and water-escape structures; mechanisms and morphologies
Affiliation: Simon Fraser University, Department of Earth Sciences, Burnaby, BC, Canada
Pages: 808-816
Published: 200911
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 12
Accession Number: 2010-002867
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, 5 plates
Secondary Affiliation: University of Alberta, CAN, Canada
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: 201002
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