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GEOREF RECORD

Potassium-Argon Ages of Lavas from the Hawi and Pololu Volcanic Series, Kohala Volcano, Hawaii

Ian McDougall and D. A. Swanson
Potassium-Argon Ages of Lavas from the Hawi and Pololu Volcanic Series, Kohala Volcano, Hawaii
Geological Society of America Bulletin (1972) 83 (12): 3731-3737

Abstract

Kohala is regarded as the oldest major shield volcano on the island of Hawaii. Potassium-argon ages of nine lava flows from the predominantly tholeiitic Pololu Volcanic Series of Kohala Volcano range from about 0.33 m.y. to about 0.45 m.y. These results suggest that the subaerial part of the shield was built over a period on the order of 0.1 m.y. in the late Pleistocene, and that much of the island of Hawaii is younger than 0.4 m.y. Mugearite lava flows from the younger Hawi Volcanic Series are between 0.06 and 0.25 m.y. old. These ages confirm that the hiatus between the basaltic shield-building phase of volcanism and the veneer of differentiated alkali lava on Kohala is less than 0.2 m.y. It is inferred that the Lualualei stand of the sea began less than 0.4 m.y. ago and ended before about 0.15 m.y. ago.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 83
Serial Issue: 12
Title: Potassium-Argon Ages of Lavas from the Hawi and Pololu Volcanic Series, Kohala Volcano, Hawaii
Pages: 3731-3737
Published: 1972
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1972-035194
Categories: Geochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: geol. sketch map
N19°00'00" - N28°30'00", W179°00'00" - W155°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from U. S. Geological Survey, Hawaiian Volcano Observatory, , United States
Update Code: 1972
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