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

Date

1978-07

Contributor

Advisor

Department

Instructor

Depositor

Speaker

Researcher

Consultant

Interviewer

Narrator

Transcriber

Annotator

Journal Title

Journal ISSN

Volume Title

Publisher

Geology Journal

Volume

Number/Issue

Starting Page

Ending Page

Alternative Title

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.

Description

Keywords

HGP-A, hydrothermal, basalts, Kilauea, Puna, Big Island, Hawaii, Geothermal resources--Hawaii--Hawaii Island, Geothermal resources--Hawaiʻi

Citation

Stone C, Fan PF. 1978. Hydrothermal alteration of basalts from Hawaii Geothermal Project Well-A, Kilauea, Hawaii. Geology Journal.

Extent

4 pages

Format

Geographic Location

Time Period

Related To

Related To (URI)

Table of Contents

Rights

Rights Holder

Local Contexts

Email libraryada-l@lists.hawaii.edu if you need this content in ADA-compliant format.