Evidence for a Light-Rare-Earth-Element-Depleted Source for Some Ferroan Anorthosites

Details Evidence for a Light-Rare-Earth-Element-Depleted Source for Some Ferroan Anorthosites Evidence for a Light-Rare-Earth-Element-Depleted Source for Some Ferroan Anorthosites

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998lpico.957q...2b&link_type=abstract

Origin of the Earth and Moon, Proceedings of the Conference held 1-3 December, 1998 in Monterey, California. LPI Contribution N

Computer Science

Anorthosite, Lunar Crust, Lunar Rocks, Selenology, Moon, Lunar Composition, Chondrites, Magma, Ferrous Metals, Samarium, Neodymium

Scientific paper

In the lunar magma ocean model, ferroan anorthosites (FANs) are expected to be derived from a relatively undifferentiated source with chondritic REE abundances and yield the oldest radiometric ages of any lunar rocks. Samarium-neodymium-isotopic analyses of 60025 and 67016 yielded ages of 4.44 +/- 0.02 Ga and 4.53 +/- 0.12 Ga and initial EpsilonNd(sup 143) values in excess of -0.5. These ages are within error of ages determined on some Mg-suite rocks by researchers. Thus, the existing data are not completely consistent with the standard magma ocean model. We have completed isotopic analysis on the pristine FAN 62236 in order to place further constraints on lunar crust-forming processes.

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