Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..793m&link_type=abstract
Lunar and Planetary Science, volume 27, page 793
Computer Science
1
Deformation, Dynamics, Rheology, Tectonics, Venus
Scientific paper
We have performed an experimental and textural study to characterize the high-temperature creep behavior of natural diabase rock under dry deformation conditions. Samples of both Maryland diabase and Columbia diabase were investigated to measure the effects of temperature, oxygen fugacity, and ratio of plagioclase to pyroxene on the creep strength. The Maryland diabase is composed of ~56 vol% plagioclase, ~38 vol% augite, ~5 vol% pigeonite, ~1 vol% magnetite-ilmenite, and trace chlorite (altered from pyroxene); the grain size of the plagioclase is ~30 microns x 100 microns, while that of the pyroxenes is ~50 microns. The Columbia diabase is composed of ~70 vol% plagioclase, ~6 vol% augite, ~17 vol% hypersthene, ~3% magnetite-ilmenite, and ~3% chlorite (altered from pyroxene); the grain size of the plagioclase is ~100 microns x 600 microns, while that of the pyroxenes is ~200 microns. Samples of each diabase were heated in a controlled-atmosphere room-pressure apparatus at 1000 degrees C for 50 h under controlled oxygen fugacity conditions, causing the dehydration of the hydrous minerals. In subsequent deformation experiments, the more plagioclase-rich Columbia diabase (Mackwell et al. 1995) has a significantly lower strength than the more pyroxene-rich Maryland diabase.
Bystricky Misha
Kohlstedt David L.
Mackwell Stephen J.
White Jonathan C.
Zimmerman Mark E.
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