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Hydrothermal alteration mineralogy in geothermal fields with case examples from Olkaria Domes geothermal field, Kenya

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dc.contributor KenGen is
dc.contributor Jarðhitaskóli Háskóla Sameinuðu þjóðanna is
dc.contributor United Nations University is
dc.contributor United Nations University, Geothermal Training Programme is
dc.contributor.author Lagat, John Kipng'etich 1968 is
dc.date.accessioned 2020-10-22T16:24:06Z
dc.date.available 2020-10-22T16:24:06Z
dc.date.issued 2019
dc.identifier.issn 1670-794x
dc.identifier.uri http://hdl.handle.net/10802/26952
dc.description Presented at SDG Short Course IV on Exploration and Development of Geothermal Resources, organized by UNU-GTP and KenGen, at Lake Bogoria and Lake Naivasha, Kenya, Nov. 13 – Dec. 3, 2019 is
dc.description.abstract In geothermal environments, primary minerals usually tend to alter to secondary (hydrothermal alteration) minerals that are either stable or at least metastable in these environments. The formation of these hydrothermal alteration minerals is usually dependent on the temperature, permeability, pressure, fluid composition, initial composition of the rock and the duration of the hydrothermal activity. These factors are largely independent, but the effects of one or more of the factors can exert a dominant influence in the location and extent of hydrothermal alteration. Case study examples have been derived from studies done on the three exploration wells at Olkaria Domes geothermal field where appraisal drilling is currently underway. The main hydrothermal minerals in the geothermal field are albite, amphibole (actinolite), biotite, calcite, chlorite, chalcedony, epidote, fluorite, garnet, illite, Kfeldspar (adularia), mordenite, secondary Fe-Ti oxides, sulfides (pyrite), titanite (sphene) and quartz. In addition, minor amounts of wairakite and prehnite are present. The occurrences and distribution of these hydrothermal minerals indicate that the minerals in all the wells show prograde variation patterns. The correlation of between the formation, interpreted hydrothermal alteration and fluid inclusion temperatures indicate that there have been temporal changes in the Olkaria Domes systems with part of the field indicating cooling whereas other parts indicate heating. is
dc.format.extent 1 rafrænt gagn (23 bls.). is
dc.language.iso en
dc.publisher United Nations University is
dc.relation.ispartof 991012006979706886
dc.relation.ispartofseries United Nations University., UNU Geothermal Training Programme, Iceland. Short Course ; SC-28
dc.relation.uri https://orkustofnun.is/gogn/unu-gtp-sc/UNU-GTP-SC-28-0104.pdf
dc.subject Jarðefnafræði is
dc.subject Ummyndun is
dc.subject Jarðhiti is
dc.subject Jarðhitanýting is
dc.subject Jarðhitaleit is
dc.subject Kenía is
dc.title Hydrothermal alteration mineralogy in geothermal fields with case examples from Olkaria Domes geothermal field, Kenya en
dc.type Bók is
dc.identifier.gegnir 991012007459706886


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