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Title: Morphology and Late Tertiary and Quaternary evolution of the Oman coastline between Muscat and Ras al Hadd
Author: Al-Hatrushi, S. M.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1995
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Abstract:
The main aims of this thesis are to present data concerning the morphology and evolution of this previously neglected coastline and to develop a tentative chronological model of its evolution during the Late Tertiary and Quaternary. To achieve the first aim, analysis of topographic and geological maps, as well as aerial photographs was carried out in addition to field mapping. The second aim was achieved by analyzing the raised shore platforms and associated deposits in terms of (1) their altitude using appropriate techniques, (2) radiocarbon dating of shell and coral fragments and (3) some sedimentary analysis. The altitudinal measurements allowed the construction of a height-distance diagram. Five samples of shell and coral fragments from raised beaches and coral terrace ranging in heights from 3m to 14m above sea level yielded dates that range from 26,400 ± 550 to > 40,000 year BP. Based on the data collected and observations made, a tentative chronological model of the evolution of the present coastline, and of the formation and development of the raised shore platforms during the Late Tertiary and Quaternary is presented. This model views the evolution of the present study coast as being affected not only by marine action associated with eustatic sea level changes since Late Tertiary times but also by tectonic uplift, and to a lesser extent fluvial action and subaerial weathering processes. That there is relatively little correspondence in the altitudes of shorelines across major fault lines which intersect the coastline is taken as evidence of differential tectonic uplift producing horst and graben structures. Possible developmental sequences of differential uplift to produce the altitudinal sequence observed are discussed. The radiocarbon dates indicate that none of the shorelines is Holocene in age but, because of possible contamination by younger carbon, their dates could be figures that represent Quaternary dates underestimated by a considerable margin. The results are discussed in the context of the limited number of other studies of coastal evolution carried out in the surrounding area.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.635682  DOI: Not available
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