Age and Petrology of the Kalaupapa Basalt, Molokai, Hawaii
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1982-10
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University of Hawai'i Press
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Abstract
The post-erosional Kalaupapa Basalt on East Molokai, Hawaii,
erupted between 0.34 and 0.57 million years ago to form the Kalaupapa Peninsula.
The Kalaupapa Basalt ranges in composition from basanite to lava transitional
between alkalic and tholeiitic basalt. Rare-earth and other trace-element
abundances suggest that the Kalaupapa Basalt could be generated by 11-17%
partial melting of a light-REE-enriched source like that from which the posterosional
lavas of the Honolulu Group on Oahu were generated by 2-11%
melting. The 87Sr/86Sr ratios of the lavas range from 0.70320 to 0.70332, suggesting
that the variation in composition mainly reflects variation in the melting
process rather than heterogeneity of sources. The length of the period of volcanic
quiescence that preceded eruption of post-erosional lavas in the Hawaiian
Islands decreased as volcanism progressed from Kauai toward Kilauea.
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Clague DA, Dao-gong C, Murnane R, Beeson MH, Lanphere MA, Dalrymple GB, Friesen W, Holcomb RT. 1982. Age and petrology of the Kalaupapa Basalt, Molokai, Hawaii. Pac Sci 36(4): 411-420.
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