Intensive and Bulk Compositional Controls on Hydrothermally Altered Mafic Rocks--Implications on the Study of Martian Hydrothermal Metamorphism

Details Intensive and Bulk Compositional Controls on Hydrothermally Altered Mafic Rocks--Implications on the Study of Martian Hydrothermal Metamorphism Intensive and Bulk Compositional Controls on Hydrothermally Altered Mafic Rocks--Implications on the Study of Martian Hydrothermal Metamorphism

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27...85b&link_type=abstract

Lunar and Planetary Science, volume 27, page 85

Other

Basalt, Mars, Mars: Hydrothermal Processes, Metamorphism, Pumpellyite

Scientific paper

The occurrence of hydrothermally altered rocks on Mars has important implications with regard to exobiology; the planetary CO2 budget and petrology. It is highly probable that hydrothermally altered martian rocks will contain mineral assemblages similar to those found in metamorphosed mafic rocks on Earth and could be assigned to the zeolite-, prehnite-pumpellyite-, prehnite-actinolite-, pumpellyite-actinolite-, or greenschist-facies. The mineralogy of metamorphosed mafic rocks is very sensitive to changes in their intensive conditions, such as pressure (P) and temperature (T). Unfortunately, most terrestrial metamorphosed mafic rocks contain high-variance assemblages (phase-rule degrees of freedom > 3) that can not be used individually to estimate P or T. When Martian samples are returned to Earth during the early part of the next century, it is highly probable that they will contain high-variance assemblages. Fruitful interpretation of these samples will require that they be placed in petrological context with their terrestrial counterparts. Fortunately, the terrestrial high-variance assemblages typically exhibit a systematic correspondence between effective bulk composition and mineral assemblage, and can be used to interpret the P, T and fluid composition during metamorphism. _

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