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Dey & Kranz 1988
Dey, T.N. and Kranz, R.L. (1988). State of stress and relationship of mechanical properties to hydrothermal alteration at Valles caldera core hole 1, New Mexico. Journal of Geophysical Research 93: doi: 10.1029/88JB01396. issn: 0148-0227.

We measured the densities, total and microcrack porosities, and ultrasonic velocities of a number of core samples from an 856-m-deep core hole near the Banco Bonito vent at Valles Caldera, New Mexico. Reductions in porosity with depth define a zone from about 600 m down where hydrothermal mineralization and recrystallization have been most active. This zone is also reflected in a large decrease in the anisotropy of acoustic velocities. Stress orientation estimates based on microcrack orientations at the 812-m depth as determined by differential strain curve analysis, as well as anelastic strain recovery measurements on a sample from 472-m depth, show a horizontal E-W minimum compression direction and a maximum compression inclined about 30¿ from vertical.

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Abstract

Keywords
Tectonophysics, Hydrothermal systems, Physical Properties of Rocks, Permeability and porosity, Information Related to Geographic Region, North America
Journal
Journal of Geophysical Research
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American Geophysical Union
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