Venus, JH, Mountney, NP and McCaffrey, WD (2015) Syn-sedimentary salt diapirism as a control on fluvial system evolution: an example from the proximal Permian Cutler Group, SE Utah, U.S.A. Basin Research, 27 (2). 152 - 182. ISSN 0950-091X
Abstract
Loading of subsurface salt during accumulation of fluvial strata can result in halokinesis and the growth of salt pillows, walls and diapirs. Such movement may eventually result in the formation of salt-walled mini-basins, whose style of architectural infill may be used to infer both the relative rates of salt-wall growth and sedimentation and the nature of the fluvial-system response to salt movement. The Salt Anticline Region of the Paradox Basin of SE Utah comprises a series of elongate salt-walled mini-basins, arranged in a NW-trending array. The bulk of salt movement occurred during deposition of the Permian Cutler Group, a wedge of predominantly quartzo-feldspathic clastic strata comprising sediment derived from the Uncompahgre Uplift to the NE. The sedimentary architecture of selected mini-basin fills has been determined at high resolution through outcrop study. Mini-basin centres are characterized by multi-storey fluvial channel elements arranged into stacked channel complexes, with only limited preservation of overbank elements. At mini-basin margins, thick successions of fluvial overbank and sheet-like elements dominate in rim-syncline depocentres adjacent to salt walls; many such accumulations are unconformably overlain by single-storey fluvial channel elements that accumulated during episodes of salt-wall breaching. The absence of gypsum clasts suggests that sediment influx was high, preventing syn-sedimentary surface exposure of salt. Instead, fluvial breaching of salt-generated topography reworked previously deposited sediments of the Cutler Group atop growing salt walls. Palaeocurrent data indicate that fluvial palaeoflow to the SW early in the history of basin infill was subsequently diverted to the W and ultimately to the NW as the salt walls grew to form topographic barriers. Late-stage retreat of the Cutler fluvial system coincided with construction and accumulation of an aeolian system, recording a period of heightened climatic aridity. Aeolian sediments are preserved in the lees of some salt walls, demonstrating that halokinesis played a complex role in the differential trapping of sediment.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2014 John Wiley & Sons Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists. This is an author produced version of a paper accepted for publication in Basin Research. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Institute for Applied Geosciences (IAG) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 18 Sep 2014 15:05 |
Last Modified: | 30 Jul 2015 04:39 |
Published Version: | http://dx.doi.org/10.1111/bre.12066 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1111/bre.12066 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:80262 |