Please use this identifier to cite or link to this item: http://hdl.handle.net/10524/63239

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

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dc.contributor.author Stone, Claudia
dc.contributor.author Fan, Pow-foong
dc.date.accessioned 2020-04-21T00:01:18Z
dc.date.available 2020-04-21T00:01:18Z
dc.date.issued 1978-07
dc.identifier.citation Stone C, Fan PF. 1978. Hydrothermal alteration of basalts from Hawaii Geothermal Project Well-A, Kilauea, Hawaii. Geology Journal.
dc.identifier.uri http://hdl.handle.net/10524/63239
dc.description.abstract Mineralogical 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.sponsorship Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa
dc.format.extent 4 pages
dc.language.iso eng
dc.publisher Geology Journal
dc.subject HGP-A
dc.subject hydrothermal
dc.subject basalts
dc.subject Kilauea
dc.subject Puna
dc.subject Big Island
dc.subject Hawaii
dc.subject.lcsh Geothermal resources--Hawaii--Hawaii Island
dc.subject.lcsh Geothermal resources--Hawaiʻi
dc.title Hydrothermal alteration of basalts from Hawaii Geothermal Project Well-A, Kilauea, Hawaii
dc.type Journal Article
dc.type.dcmi Text
Appears in Collections: The Geothermal Collection
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