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Postshield stage transitional volcanism on Mahukona Volcano, Hawaii

Bulletin of Volcanology

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DOI: 10.1007/s00445-008-0240-z

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Abstract

Age spectra from 40Ar/39Ar incremental heating experiments yield ages of 298??25 ka and 310??31 ka for transitional composition lavas from two cones on submarine Mahukona Volcano, Hawaii. These ages are younger than the inferred end of the tholeiitic shield stage and indicate that the volcano had entered the postshield alkalic stage before going extinct. Previously reported elevated helium isotopic ratios of lavas from one of these cones were incorrectly interpreted to indicate eruption during a preshield alkalic stage. Consequently, high helium isotopic ratios are a poor indicator of eruptive stage, as they occur in preshield, shield, and postshield stage lavas. Loihi Seamount and Kilauea are the only known Hawaiian volcanoes where the volume of preshield alkalic stage lavas can be estimated. ?? Springer-Verlag 2008.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Postshield stage transitional volcanism on Mahukona Volcano, Hawaii
Series title:
Bulletin of Volcanology
DOI:
10.1007/s00445-008-0240-z
Volume
71
Issue:
5
Year Published:
2009
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Bulletin of Volcanology
First page:
533
Last page:
539
Number of Pages:
7