Comments on: The structure of the shallow crust beneath Olkaria geothermal field, Kenya, deduced from gravity studies, by J.M. Ndombi |
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| Authors: | MP Hochstein |
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| Abstract: | Major geothermal systems in the Kenya Rift Valley are located over, or near to, elongated axial gravity highs. A recently published interpretative model, which explains the axial gravity high over the Olkaria geothermal field in terms of shallow dyke intrusions, is not acceptable. This conclusion is corroborated by density measurements on surface samples and cores from production bores in the Olkaria field. Elongated, high-standing mafic intrusions are the likely source of the axial gravity highs in the rift valley. These intrusions appear to be the heat source for most geothermal systems in the rift. |
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