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Stability fields of Mg‐pumpellyite composition at high pressures and temperatures
Author(s) -
Liu Lingun
Publication year - 1989
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl016i008p00847
Subject(s) - pyrope , kyanite , coesite , stishovite , phengite , geology , corundum , mineralogy , geochemistry , paleontology , quartz , tectonics , eclogite , metamorphic rock , subduction
Mg‐pumpellyite was observed to break down to the assemblage pyrope + kyanite + coesite + (H 2 O) in the pressure range 60–80 kbar, to the assemblage pyrope + kyanite + stishovite + (H 2 O) in the range 100–140 kbar, and to the asemblage pyrope + corundum + stishovite + (H 2 O) in the range 160–220 kbar at 800–1000°C in a diamond‐anvil cell coupled with laser heating. Mg‐pumpellyite may exist in the coldest part of a subducting lithosphere down to a depth of about 300 km.