Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p51a..05w&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P51A-05
Other
1060 Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008), 1065 Trace Elements (3670), 3662 Meteorites, 3670 Minor And Trace Element Composition, 5410 Composition
Scientific paper
The Martian meteorites are comprised of four main subgroups: the basaltic and lherzolitic shergottites with ages in the range of ~ 180-575 Ma, the clinopyroxenitic nakhlites with ages of ~ 1.3 Ga, the dunite Chassigny (also having an age of ~ 1.3 Ga) and the orthopyroxenite ALH84001 which has a crystallization age of ~ 4.5 Ga. Since these subgroups represent crustal terrains of different ages, they potentially record different environmental conditions at (and subsequent to) their time of emplacement on Mars. From the time of magma generation that produced their parental melts to their eventual ejection from the surface by large impacts, these rocks have undergone processes which have left their imprints on their geochemical characteristics. These processes range from assimilation and mixing of altered and weathered crustal rocks into the parental magma before emplacement to post-emplacement processes such as infiltration metasomatism, alteration by aqueous fluids and shock metamorphism. Each of the Martian meteorite subgroups has recorded one or more of these processes on Mars and unraveling their geochemical affects (not only from each other but also from terrestrial alteration) can be a challenging task. However, the systematics of trace and minor element (particularly rare earth element) distributions in individual minerals of these rocks offer a means of identifying the type and extent of alteration that has occurred at or near the surface of Mars. The following three case studies will be considered here to illustrate how various alteration processes on Mars have affected the different Martian meteorite subclasses, (1) effects of infiltration metasomatism on the ancient Martian meteorite ALH84001, (2) aqueous alteration of a nakhlite, and finally (3) assimilation of altered crust by shergottite parent magmas. Each of these case studies has broader implications for the global composition and evolution of Mars.
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