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Open-File Report 2014–1090

Electron Microprobe Analyses of Glasses from Kīlauea Tephra Units, Kīlauea Volcano, Hawaii

By Rosalind T. Helz, David A. Clague, Larry G. Mastin, and Timothy R. Rose

Thumbnail of and link to report PDF (2.07 MB)Abstract

This report presents approximately 2,100 glass analyses from three tephra units of Kīlauea Volcano: the Keanakākoʻi Tephra, the Kulanaokuaiki Tephra, and the Pāhala Ash. It also includes some new analyses obtained as part of a re-evaluation of the MgO contents of glasses in two of the three original datasets; this re-evaluation was conducted to improve the consistency of glass MgO contents among the three datasets. The glass data are a principal focus of Helz and others (in press), which will appear in the AGU Monograph Hawaiian Volcanoes—From Source to Surface. The report is intended to support this publication, in addition to making the data available to the scientific community.

First posted May 27, 2014

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Suggested citation:

Helz, R.T., Clague, D.A., Mastin, L.G., and Rose, T.R., 2014, Electron microprobe analyses of glasses from Kīlauea Tephra Units, Kīlauea Volcano, Hawaii: U.S. Geological Survey Open-File Report 2014–1090, 24 p., plus 2 appendixes in separate files,

ISSN 2331-1258 (online)



Description of Tephra Units and Glass Samples

Re-Evaluation of Magnesium Oxide Contents of Tephra Glasses

Description of Analytical Tables




References Cited

Appendix A. Analyses of Glasses from Three Kīlauea Tephra Units, Kīlauea Volcano, Hawaii

Appendix B. Detailed Descriptions of the Four Sections of Kulanaokuaiki and Uwēkahuna Tephra, Kīlauea Volcano, Hawaii

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