Rb-Sr and Sm-Nd internal isochron ages of a subophitic basalt clast and a matrix sample from the Y75011 eucrite

Details Rb-Sr and Sm-Nd internal isochron ages of a subophitic basalt clast and a matrix sample from the Y75011 eucrite Rb-Sr and Sm-Nd internal isochron ages of a subophitic basalt clast and a matrix sample from the Y75011 eucrite

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.8137n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, July 10, 1986, p. 8137-8150.

Mathematics

Logic

50

Basalt, Geochronology, Planetary Evolution, Radioactive Age Determination, Neodymium Isotopes, Petrology, Planetology, Rubidium Isotopes, Samarium Isotopes, Samples, Solar System, Strontium Isotopes

Scientific paper

Rb-Sr and Sm-Nd dating studies of the Yamato polymict eucrite Y75011, which contains several coarse-grained mesostasis-rich basaltic clasts with subophitic texture which are representative of pristine lavalike basalts extruded on the surface of the Howardite-Eucrite-Diogenite (HED) parent body, are reported. The results show that moderately evolved basaltic lavas were produced very early in the history of the HED parent body. Their preservation as clasts in the polymict eucrites suggests derivation from a different geological setting on the parent body than that occupied by the more thermally metamorphosed monomict eucrites. It is suggested that the preservation of pristine clasts in polymict eucrites may be due to their impact excavation to the surface of the parent body away from heat sources concentrated within impact craters.

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