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Title: Sedimentology and stratigraphic evolution of the Pennsylvanian-Permian Lower Cutler Beds, Paradox Basin, SE Utah
Author: Jordan, Oliver D.
Awarding Body: Keele University
Current Institution: Keele University
Date of Award: 2006
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Abstract:
The Lower Cutler Beds (Cutler Group) is a mixed siliciclastic-carbonate Pennsylvanian-Permian age succession deposited in the Paradox foreland basin, southeast Utah. This research performed a detailed and high resolution sedimentological and stratigraphical analysis in order to answer a series of currently unresolved questions regarding the response of coastal desert systems to changes in stratigraphic controls and how they are reflected in the expression of a mixed aeolian, fluvial and shallow marine sedimentary succession. The Lower Cutler Beds is an ancient coastal desert system which underwent periodic shutdown, deflation and inundation from the northeast of the basin by fluvial systems derived from the uplifting Uncompahgre Hinge, and was periodically transgressed by a shallow sea to the west. The development of a new facies scheme has been used to document the transition of various sub-environments from the continentally-dominated deposition in the most northern study regions (Lockhart Basin and Shafer Basin) to marine-dominated deposition in the most southern study regions (Canyonlands District and Grabens District). Complex architectural interactions between aeolian, fluvial, shallow marine and nearshore facies associations have been related to autocyclic and allocyclic control mechanisms, and have allowed the development of depositional models accounting for the architectural expression. Field data have been used in the production of both a regional stratigraphic computer model and a detailed reservoir model for a mixed shallow-marine, aeolian and fluvial succession, and accurately portrays the system in three-dimensions. Various different applications of computer modelling techniques are presented and examined. Sedimentaryd epositsf rom both marinea ndn on-marines uccessionas rer ecognised to be the result of complex interactions and feedbacks between climatic, eustatic and tectonic controls. Stratigraphic analysis has enabled units of genetically-related packages of sediment to be correlated from continental facies types to their contemporaneous marine counterparts. A series of conceptual models that account for system accumulation and preservation have been developed with each model being related to specific climatic and eustatic episodes. Sea level lowstands equate with more and periods which encouraged aeolian accumulation and preservation. Rising sea levels resulted in erg shut down and the generation of a deflation surface. Deposition of the Lower Cutler Beds is thought to be the expression of high frequency sea level variations driven by glacio-eustatic cycles superimposed on a longer-term tectono-stratigraphic cycle.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.486007  DOI: Not available
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