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GEOREF RECORD

Hydrothermal mineralogy of Keolu Hills, Oahu, Hawaii

K. Y. Fujishima and P.-F. Fan
Hydrothermal mineralogy of Keolu Hills, Oahu, Hawaii
American Mineralogist (June 1977) 62 (5-6): 574-582

Abstract

The mineralogy of the hydrothermally altered basalts of the Kailua Volcanic Series from Keolu Hills, Oahu, Hawaii, was examined by X-ray diffraction analysis. Vertical and horizontal clay-mineral alteration zones were found. In the vertical zones, mixed-layer chlorite-vermiculite occurs more commonly than chlorite, whereas in the horizontal zones, mixed-layer chlorite-montmorillonite and chlorite are both more common. The occurrence of the two clay minerals kaolinite and mixed-layer chlorite-montmorillonite in the soil is not related to the parent rock but to differences in drainage. The zeolites are calcium zeolites which commonly coexist with quartz; laumontite is the dominant zeolite in the study area. The widespread distribution of laumontite in the Kailua Volcanic Series suggests that low temperatures (approximately 300 degrees C) prevailed during the formation of secondary minerals and indicates that as much as 3,500 feet of weathering has occurred since caldera formation.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 62
Serial Issue: 5-6
Title: Hydrothermal mineralogy of Keolu Hills, Oahu, Hawaii
Affiliation: Univ. Hawaii, Dep. Geol. Geophys., Honolulu, Hawaii, United States
Pages: 574-582
Published: 197706
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 23
Accession Number: 1977-044377
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
N21°19'60" - N21°24'15", W157°46'30" - W157°41'30"
Source Note: Hawaii Inst. Geophys.; Contrib. No. 805
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from U. S. Geological Survey, Hawaiian Volcano Observatory, , United States
Update Code: 1977
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