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Absolute paleointensity from Hawaiian lavas younger than 35 ka

Earth and Planetary Science Letters

By:
, , , , and
DOI: 10.1016/S0012-821X(98)00133-2

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Abstract

Paleointensity studies have been conducted in air and in argon atmosphere on nine lava flows with radiocarbon ages distributed between 3.3 and 28.2 ka from the Mauna Loa volcano in the big island of Hawaii. Determinations of paleointensity obtained at eight sites depict the same overall pattern as the previous results for the same period in Hawaii, although the overall average field intensity appears to be lower. Since the present results were determined at higher temperatures than in the previous studies, this discrepancy raises questions regarding the selection of low versus high-temperature segments that are usually made for absolute paleointensity. The virtual dipole moments are similar to those displayed by the worldwide data set obtained from dated lava flows. When averaged within finite time intervals, the worldwide values match nicely the variations of the Sint-200 synthetic record of relative paleointensity and confirm the overall decrease of the dipole field intensity during most of this period. The convergence between the existing records at Hawaii and the rest of the world does not favour the presence of persistent strong non-dipole components beneath Hawaii for this period.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Absolute paleointensity from Hawaiian lavas younger than 35 ka
Series title:
Earth and Planetary Science Letters
DOI:
10.1016/S0012-821X(98)00133-2
Volume
161
Issue:
1-4
Year Published:
1998
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Earth and Planetary Science Letters
First page:
19
Last page:
32
Number of Pages:
14