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Title: The sequence stratigraphy and correlation of dryland fluvial systems : a geomorphic perspective from Basin and Range Province, SW USA
Author: Archer, Stuart G.
ISNI:       0000 0001 3426 4934
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 2006
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This study uses geomorphic observations from the Basin and Range Province, SW USA, to ground truth dryland sequence stratigraphic concepts in an intra-continental rift setting. Three geomorphic experiments were designed to test the sequence stratigraphic response to changes in the allogenic variables of 1) climate, 2) tectonics and 3) base level. 1) A regional synthesis of the alluvial response to Pleistocene-Holocene acidification has been compiled from case study areas 1000 km apart. This analysis reveals three different alluvial responses, depending on the subtle interplay between sediment supply and discharge. The search for a regionally correlatable alluvial response to climate change may therefore be futile. 2) Morphometric analysis has identified a spectrum of tectonically generated landforms. These include both tectonically immature and mature elements. These observations indicate that ancient continental rifts will also have been prone to the coeval existence of highly contrasting maturity domains. Additionally, in contrast to recently published literature, variable subsidence patterns do not provide the dominant control on alluvial fan size. A holistic re-evaluation of the factors governing fan size indicates that the key variables are: sediment supply (primarily catchment area, but also attitude and gradient) and vertical and horizontal accommodation space (subsidence rates and basin width respectively). 3) Structural sills provide a form of tectonic base level that can partition rift basins. Their potential influence on drainage organisation, and the extent of sequence boundaries has been previously under-appreciated.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available