Author:
Seifert Karl E.,Verploeg Alan J.
Abstract
The dominant mode of deformation for anorthosite deformed experimentally at temperatures from 400 °C to 1000 °C and confining pressures from 5 to 17 kbar (5 × 105–17 × 105 kPa) at a constant strain rate of 8 × 10−5 s−1 is cataclasis, although plastic flow occurs abundantly at temperatures of 800 °C or above. The amount of plastic flow increases rapidly as temperature is increased. An anorthosite sample (AW14) containing abundant alteration prior to testing shows a further increase in alteration during testing, and is weak at temperatures of 800 °C or greater compared to an unaltered anorthosite sample (TL3), although their strength is similar below 800 °C. Some plagioclase in sample TL3 converted from the original low or low transitional structural state to a high or high transitional state during testing at 800 °C or above. Albite and pericline twins and deformation lamellae produced during tests concentrate in the regions of cores showing structural conversion, and are most common at temperatures of 800 °C or greater. The distribution of both alteration and structurally converted plagioclase produced during testing appears to be related to temperature gradients within cores.
Publisher
Canadian Science Publishing
Subject
General Earth and Planetary Sciences
Cited by
9 articles.
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