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Title: Controls on fluvial sedimentary architecture and sediment fill-state in salt-walled minibasins
Author: Banham, Steven Gordon
Awarding Body: University of Leeds
Current Institution: University of Leeds
Date of Award: 2013
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Halokinesis and climate can exert strong controls on the accumulation of fluvial stratigraphy within a series of salt walled mini-basins, which can be expressed as a number subtle features within the preserved stratigraphic record:  Control of drainage networks entering the region of halokinetic influence. Drainage pathway can be diverted or deflected by uplifted salt walls, or alternatively, become entrenched in areas of enhanced subsidence.  Drainage diversion can lead to drainage isolation of mini-basins, resulting in the accumulation of sand-poor basin-fill styles within minibasins isolated from the main drainage pathways. Conversely, basins which act as the main conduit to drainage may become preferentially sand-prone relative to adjacent basins  The interplay of sediment supply rates and subsidence rates can control the accumulating stratigraphic style, where the interplay between subsidence rates and sediment supply rate can result in the accumulation of sand-prone or sand-poor basin-fills.  The interplay between halokinesis and climate can be delineated by local (inter- to intra-basin scale) and regional (halokinetic province scale) variations of sediment distribution and accumulation: halokinesis redistributes drainage pathways and sediments between basins, where as climate is expressed as variations in sediment accumulation style across the halokinetic region. This study uses the Triassic Moenkopi Formation which accumulated within the Salt Anticline Region of southeast Utah, USA, to demonstrate the extent to which halokinesis and climate controlled the ensuing stratigraphic accumulation of a low relief dryland fluvial system within a series of actively subsiding salt-walled mini-basins. This knowledge can be used for predicting distribution of fluvial elements within subsurface halokinetic provinces for the purpose of hydrocarbon exploration.
Supervisor: Mountney, Nigel ; McCaffrey, Bill Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available