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Title: Geological history of the country between Lake Baringo and the Kerio river, Baringo district, Kenya
Author: Martyn, J. E.
Awarding Body: Royal Holloway, University of London
Current Institution: Royal Holloway, University of London
Date of Award: 1969
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Abstract:
The country between Lake Baringo and the Kerio River in the northern part of the Kenya Rift Valley is dominated by the Tugen Hills, a sector of the Kamasia Range, which passes from north to south across the western side of the area mapped. The hills are faulted and uplifted and expose about 7,000 to 8,000 feet of phonolites and tuffaceous sediments with subordinate basanites (the Tugen Hills Group of Miocene to,mid-Pliocene age) resting on an older sedimentary formation and metamorphic basement. Widespread flood trachytes follow the Tugen Hills Group, and these are over lain, mainly to the east of the Tugen Hills, by the Kaparaina Basalts whose lavas formed a shield volcano towards the north of the area. They are of upper Pliocene age. Thick fossiliferous sediments of Plio-Pleistocene age follow the basalts, and they accumulated in tectonic basins to the east of the Tugen Hills. Eruption of later phonolites, trachytes, basalts and mugearites occurred in the east of the area. The area is shown to reveal a wide variety of structures consistent with tensional tectonics. These include tilted blocks, collapsed and extended upwarps, and recent tension gashes. A tectonic history is described consisting of both major and minor faulting episodes, occurring more frequently than has been established elsewhere in the Kenya Rift. They are interspersed with periods of subsidence involving sedimentation. Uplifts are shown to be reflected in erosional rejuvenations. The petrography of the thick and varied sequence of lavas is described in an appendix at the end of the thesis.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.527559  DOI: Not available
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