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Title: Geomorphological evolution of propagating fault tips in extensional and compressional settings
Author: Davis, Alexander M.
ISNI:       0000 0004 2743 4749
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 2007
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Quaternary landscape evolution in active continental extensional and foreland basin fault segment arrays produce diverse geomorphic features resulting from the interplay between tectonics, erosional processes and climate. Numerical simulations of landscape development predict characteristic terrain features corresponding to varying tectonic and erosional model parameters. Therefore, comparison of numerical model results to modern day terrain enables an interpretation of the spatial and temporal terrain evolution of fault segments. The Grover Relay, a 4 km wide en-echelon overlap of the Star Valley normal fault segments, Wyoming, exhibits Holocene scarps. Geomorphological and stratigraphic observations has allowed the development of a catchment capture model indicating that the fault segments had initial rapidly grown into an overlap position at an early stage and continued to grow by a vertical displacement gradient which facilitated footwall catchment migration and capture of relay streams. Mapping of a new 2 km long fault segment indicates that the relay is in hard linkage. The western twenty kilometres of the Flaming Mountain, part of the Turpan foreland basin en echelon blind thrust anticline fold belt, Xinjiang China, shows evidence of Quaternary deformation. Mapping of water gaps, wind gaps and drainage diversions indicates that the blind thrust anticline tip has laterally propagated 5 km to the west since the Upper Pleistocene. The upstream steep regional slope is interpreted to have an effect on the temporal development of the anticline by maintaining water gaps across the developing fold. The change in rheology of the growing fold, by continued erosion and removal of sediments away from the fold topography by the water gaps, results in a change in deformation. Identification of key geomorphic features in these two contrasting tectonically active continental basin settings has allowed an interpretation of the spatial and temporal structural growth, which has implications for sediment dispersal pathways into continental basins.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available