Titill:
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Borehole geology and hydrothermal alteration of well KR-9, Krísuvík, SW-IcelandBorehole geology and hydrothermal alteration of well KR-9, Krísuvík, SW-Iceland |
Höfundur:
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Malapitan, Ruel T.
;
Jarðhitaskóli Háskóla Sameinuðu þjóðanna
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URI:
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http://hdl.handle.net/10802/23288
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Útgefandi:
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United Nations University; Orkustofnun
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Útgáfa:
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1995 |
Ritröð:
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United Nations University., UNU Geothermal Training Programme, Iceland. Report ; 1995:8 |
Efnisorð:
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Jarðhiti; Jarðhitarannsóknir; Jarðboranir; Borholur; Krýsuvík; KR-9 (borhola)
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ISSN:
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1670-7427 |
Tungumál:
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Enska
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Tengd vefsíðuslóð:
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http://www.os.is/gogn/unu-gtp-report/UNU-GTP-1995-08.pdf
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Tegund:
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Bók |
Gegnir ID:
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991010423389706886
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Athugasemdir:
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Myndefni: kort, línurit, töflur. |
Útdráttur:
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KR-9 is a 327 m deep production well drilled in the Krísuvík high-temperature field for space heating purposes. Rock formation consists dominantly of hyaloclastite overlying a lava formation believed to be deposited during the last glacial and interglacial period (~125,000 years). Although these rock series are of similar basaltic composition, they show variable hydrothermal alteration with the hyaloclastites being more sensitive to alteration than the lava formation. As is typical for Icelandic hydrothermal alteration, the well showed smectite-zeolite zones as the most common with probable occurrences of mixed layer clays within the zone. The traces of mixed layer clays signal an approaching disagreement of the smectite-zeolite alteration zone with depth indicating increasing temperature. Mineral formation temperature for smectite-zeolite is <200°C and lower boundary of mixed layer clays arbitrarily fixed at 220-230°C. Functions of alteration are controlled primarily by rock porosity, permeability, temperature and duration of geothermal activities. Aquifers in this well were located on the bases of borehole measurements and records of circulation losses. The aquifers were located at 229, 304 and 317 m. Circulation loss zones could be related to intraformational rock boundaries that serve as channelways for geothermal fluid. |