Hydrothermal alteration of basalts from Hawaii Geothermal Project Well-A, Kilauea, Hawaii

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dc.contributor.authorStone, Claudia
dc.contributor.authorFan, Pow-foong
dc.date.accessioned2020-04-21T00:01:18Z
dc.date.accessioned2020-04-21T01:11:19Z
dc.date.available2020-04-21T00:01:18Z
dc.date.available2020-04-21T01:11:19Z
dc.date.issued1978-07
dc.description.abstractMineralogical examination of basaltic rocks obtained during drilling of a successful 1,962-m-deep geothermal well (HGP-A) in the east rift zone of Kilauea Volcano, Hawaii, reveals three zones of hydrothermal alteration beneath a zone of unaltered lavas. Each alteration zone is characterized by the dominance of a particular mineral: zone 1, montmorillonite; zone 2, chlorite; zone 3, actinolite. Three zones of relative permeability can be tentatively identified on the basis of filled versus partly filled vesicles and fractures. Because the well has not returned to thermal equilibrium as of this writing, stability relations between secondary minerals and temperatures cannot be calculated with accuracy. However, the latest downhole temperatures measured at the boundaries of alteration zones, compared with similar data from high temperature geothermal areas in Iceland, indicate that HGP-A temperatures are considerably higher than those encountered for the same alteration-zone boundaries in Icelandic wells. This indicates that the present-day thermal regime in HGP-A is relatively young and that the hydrothermal minerals probably have not reached equilibrium with existing conditions.
dc.description.sponsorshipHawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa
dc.format.extent4 pages
dc.identifier.citationStone C, Fan PF. 1978. Hydrothermal alteration of basalts from Hawaii Geothermal Project Well-A, Kilauea, Hawaii. Geology Journal.
dc.identifier.urihttp://hdl.handle.net/10524/63239
dc.language.isoeng
dc.publisherGeology Journal
dc.subjectHGP-A
dc.subjecthydrothermal
dc.subjectbasalts
dc.subjectKilauea
dc.subjectPuna
dc.subjectBig Island
dc.subjectHawaii
dc.subject.lcshGeothermal resources--Hawaii--Hawaii Island
dc.subject.lcshGeothermal resources--Hawaiʻi
dc.titleHydrothermal alteration of basalts from Hawaii Geothermal Project Well-A, Kilauea, Hawaii
dc.typeJournal Article
dc.type.dcmiText

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