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THE ORIGIN OF ALKALIC BASALTS FROM HALEAKALA VOLCANO, EAST MAUI, HAWAII

by CRAVEN, KERI

Abstract (Summary)
Studies of volcanic rocks from Hawaii reveal that the islands were formed through four distinct stages of volcanism. The origin of alkalic rocks produced during the last stage of development is not completely understood. Alkalic basalts can be generated at both high and low pressures. A new method of constraining pressure-temperature conditions of formation was developed, using the compositions of alkalic rocks from Haleakala Volcano. Initial P-T calculations indicated that the rocks formed from low degrees of melting over a range of pressures in the mantle (polybaric melting). Using a trace element modal melting equation and highly incompatible element concentrations, the degree of melting required to produce the Haleakala alkalic magmas was estimated. The results of these calculations indicate that low degrees of melting in the spinel peridotite zone of the mantle under polybaric conditions was required to produce the Haleakala alkalic basalts.
Bibliographical Information:

Advisor:

School:University of Cincinnati

School Location:USA - Ohio

Source Type:Master's Thesis

Keywords:mantle peridotite melting magma generation alkali basalt trace rare earth elements

ISBN:

Date of Publication:01/01/2003

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