A discussion of isotopic systematics and mineral zoning in the shergottites - Evidence for a 180 m.y. igneous crystallization age

Details A discussion of isotopic systematics and mineral zoning in the shergottites - Evidence for a 180 m.y. igneous crystallization age A discussion of isotopic systematics and mineral zoning in the shergottites - Evidence for a 180 m.y. igneous crystallization age

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..969j&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 16th, Houston,

Other

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Achondrites, Crystallization, Igneous Rocks, Isotopic Enrichment, Meteoritic Composition, Mineralogy, Evolution (Development), Mars (Planet), Petrology, Planetary Composition, Planetary Evolution, Meteorites, Stony Meteorites, Achondrites, Shergotty, Samples, Meteorite, Systematics, Isotopes, Minerals, Zoning, Shergottites, Mixing, Basalts, Crystallization Age, Petrography, Mineralogy, Isochrons, Metamorphism, Shock Effects, Equilibration, Thermal Effects, Hydrothermal Processes, Melting, Parent Bodies, Ori

Scientific paper

Proposed igneous and metamorphic ages of the shergottites, a suite of achondritic basaltic meteorites, are examined in terms of the shergottites' petrography and mineral chemistry. No metamorphic or hydrothermal event appears capable of resetting the refractory Sr and Nd isotopic systems of the shergottites since the time of their igneous crystallization. The approximately concordant Rb-Sr (180±20 m.y.) and U-Th-Pb (190±30 m.y.) internal "isochrons" are thus interpreted as representing the time of igneous crystallization. If the shergottites are indeed less than 200 m.y. old, they represent the youngest known extraterrestrial basalts. This conclusion is supportive of the hypothesis that the SNC meteorites are samples of the planet Mars.

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