ALH 84001 is an extraterrestrial example of an orthopyroxenite. It is an achondrite meteorite from Mars.
Orthopyroxenite is an ultramafic and ultrabasic rock that is almost exclusively made from the mineral orthopyroxene, the orthorhombic version of pyroxene and a type of pyroxenite. It can have up to a few percent of olivine and clinopyroxene.
This ternary diagram shows the orthopyroxenites as a function of olivine, clinopyroxene and orthopyroxene abundance.
Orthopyroxenites can also occur on other planets. ALH 84001 is a Martian meteorite that can be classified as an orthopyroxenite. It is the only meteorite found with that composition and the only member of the Martian orthopyroxenite group of meteorites.[1]
^"ALH 84001". Meteoritical Society. Retrieved 13 January 2013.
Orthopyroxenite is an ultramafic and ultrabasic rock that is almost exclusively made from the mineral orthopyroxene, the orthorhombic version of pyroxene...
nakhlites (20), chassignites (3), and ones otherwise (15) (containing the orthopyroxenite (OPX) Allan Hills 84001, as well as 10 basaltic breccia meteorites)...
bronzite or enstatite. Pyroxenites are classified into clinopyroxenites, orthopyroxenites, and the websterites which contain both types of pyroxenes (see diagram...
National Post. Mittlefehldt, D. W. (1994). "ALH84001, a cumulate orthopyroxenite member of the SNC meteorite group". Meteoritics. lpi.usra.edu. pp. 214–221...
McSween, H. Y. (2010). "Diogenites as polymict breccias composed of orthopyroxenite and harzburgite". Meteoritics and Planetary Science. 45 (5): 850–872...
List Martian Basaltic Breccia NWA 7034 Chassignites Kaidun Nakhlites Orthopyroxenite ALH84001 Shergottites Martian meteorites list Meteorites on Mars list...
Noriyoshi (2011). "Progress of hydration reactions in olivine–H2O and orthopyroxenite–H2O systems at 250°C and vapor-saturated pressure". Chemical Geology...
currently available. Geochemical implications from SNC meteorites and orthopyroxenite meteorite ALH84001 suggested that mean crustal thickness of Mars is...
McSween, H. Y. (2010). "Diogenites as polymict breccias composed of orthopyroxenite and harzburgite". Meteoritics and Planetary Science. 45 (5): 850–872...
of diorite rocks, olivine gabbro, and hornblende-gabbro pegmatite) Orthopyroxenite with layered, cumulate structures Serpentinite with relict mineral...
List Martian Basaltic Breccia NWA 7034 Chassignites Kaidun Nakhlites Orthopyroxenite ALH84001 Shergottites Martian meteorites list Meteorites on Mars list...
1977-12-29 482.5 First Antarctic find. Allan Hills 84001 1984 1939.9 Orthopyroxenite, 4.091 billion years old, is believed to be the oldest Martian meteorite...
Dating 2011 Andrew Beck Diogenites as polymict breccias composed of orthopyroxenite and harzburgite 2012 David Baker The transition from complex craters...
List Martian Basaltic Breccia NWA 7034 Chassignites Kaidun Nakhlites Orthopyroxenite ALH84001 Shergottites Martian meteorites list Meteorites on Mars list...
Global Information
