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Primative components, crustal assimilation, and magmatic degassing of the 2008 Kilauea summit eruption

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Abstract

Simultaneous summit and rift zone eruptions at Kīlauea starting in 2008 reflect a shallow eruptive plumbing system inundated by a bourgeoning supply of new magma from depth. Olivine-hosted melt inclusions, host glass, and bulk lava compositions of magma erupted at both the summit and east rift zone demonstrate chemical continuity at both ends of a well-worn summit-to-rift pipeline. Analysis of glass within dense-cored lapilli erupted from the summit in March – August 2008 show these are not samplings of compositionally distinct magmas stored in the shallow summit magma reservoir, but instead result from remelting and assimilation of fragments from conduit wall and vent blocks. Summit pyroclasts show the predominant and most primitive component erupted to be a homogenous, relatively trace-element-depleted melt that is a compositionally indistinguishable from east rift lava. Based on a “top-down” model for the geochemical variation in east rift zone lava over the past 30 years, we suggest that the apparent absence of a 1982 enriched component in melt inclusions, as well as the proposed summit-rift zone connectivity based on sulfur and mineral chemistry, indicate that the last of the pre-1983 magma has been flushed out of the summit reservoir during the surge of mantle-derived magma from 2003-2007.

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Additional publication details

Publication type Book chapter
Publication Subtype Book Chapter
Title Primative components, crustal assimilation, and magmatic degassing of the 2008 Kilauea summit eruption
Year Published 2015
Language English
Publisher American Geophysical Union
Contributing office(s) Volcano Science Center
Description 18 p.
Larger Work Title Hawaiian volcanoes, from source to surface
First page 439
Last page 457
Country United States
State Hawaii
Other Geospatial Kīlauea volcano
Online Only (Y/N) N
Additional Online Files (Y/N) N