Sm-Nd Systematics of Nakhlite Governador Valadares

Details Sm-Nd Systematics of Nakhlite Governador Valadares Sm-Nd Systematics of Nakhlite Governador Valadares

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1197s&link_type=abstract

Lunar and Planetary Science, volume 27, page 1197

Physics

1

Age: Samarium-Neodymium, Isochron, Isotopes: Neodymium, Mars, Meteorites: Nakhlites

Scientific paper

Sm-Nd systematics of two whole rock and three mineral separate samples from nakhlite Governador Valadares define a ^147Sm-^143Nd age of 1.36+/-0.03 Ga. This age is in excellent agreement with the Rb-Sr and ^39Ar-^40Ar ages obtained previously for this meteorite. The petrographic evidence suggests that this rock is a pyroxene cumulate crystallized in a subsurface sill. Thus, the isotopic age probably represents the age of such a magmatic event. The initial e^143Nd value determined for the rock at 1.36 Ga is +17+1, indicating the parent magma of the rock came from a LREE-depleted source. Our Sm-Nd age and e^143Nd data, and the previously published e^142Nd datum for the rock are consistent with the early formation of its source about 4.56 Ga ago, and late melting of the source and formation of the rock about 1.3 Ga ago. The good agreement of isotopic ages and textures among Governador Valadares, Nakhla and Lafayette strongly suggests that all nakhlites probably have undergone similar two-stage evolution.

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