Open-File Report 2010–1093
INTRODUCTIONThis report presents and evaluates 64 major-element analyses of previously unanalyzed Kilauea Iki drill core, plus three samples from the 1959 and 1960 eruptions of Kilauea, obtained by X-ray fluorescence (XRF) analysis during the period 1992 to 1995. All earlier major-element analyses of Kilauea Iki core, obtained by classical (gravimetric) analysis, were reported and evaluated in Helz and others (1994). In order to assess how well the newer data compare with this earlier suite of analyses, a subset of 24 samples, which had been analyzed by classical analysis, was reanalyzed using the XRF technique; those results are presented and evaluated in this report also. The XRF analyses have not been published previously. This report also provides an overview of how the chemical variations observed in these new data fit in with the chemical zonation patterns and petrologic processes inferred in earlier studies of Kilauea Iki. |
First posted May 18, 2010
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Helz, R.T., and Taggart, J.E., Jr., 2010, Whole-rock analyses of core samples from the 1988 drilling of Kilauea Iki lava lake, Hawaii: U.S. Geological Survey Open-File Report 2010–1093, 47 p.
Introduction
Background and Previous Work
Sampling Procedures – 1988 Core
Analytical Methods
Description of the Analytical Tables
Quality of the Analyses
Cross-Check with Classical Analyses
Coherence of the New Analyses: Summations
Coherence of the New Analyses: Element Ratios
Chemical Variations in Kilauea Iki Samples
Results for CO2 and H2O±
Discussion
Foundered Crust Versus the Vertical Zonation Pattern
Summary
References Cited