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Petrology and geochemistry of boninites and related lavas from the Mata Volcanoes, NE Lau Basin

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Item Summary

Title: Petrology and geochemistry of boninites and related lavas from the Mata Volcanoes, NE Lau Basin
Authors: Glancy, Sarah Elizabeth
Keywords: Mata Volcanoes
Lau Basin
Issue Date: Dec 2014
Publisher: [Honolulu] : [University of Hawaii at Manoa], [December 2014]
Abstract: The Lau Basin is an excellent location for studying suprasubduction zone processes due to numerous volcanoes spanning from the forearc, arc, reararc, to backarc settings, providing windows into different aspects of the subduction zone. The young, primarily boninitic submarine Mata Volcanoes, located between the arc and the backarc spreading center, are an important part of this picture. This thesis presents a preliminary study of the Mata Volcanoes, including XRF whole rock and glass, and mineral EPMA analysis of samples, thermometry, and crystallization modeling. Differentiation at the Mata Volcanoes occurred under oxidizing conditions, and over a temperature range of approximately 1000-1200 ⁰C. Starting magmas had high water contents of at least 1.7-2 wt%. Lavas preserve heterogeneities, suggesting that no well-developed magma storage system/homogenization zone is present. Complex crystal chemistry and compositions suggest that magma mixing played a role in the formation of these magmas.
Description: M.S. University of Hawaii at Manoa 2014.
Includes bibliographical references.
Rights: All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections:M.S. - Geology and Geophysics

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