Computer Science
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.2155l&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, Aug. 1990, p. 2155-2159.
Computer Science
2
Achondrites, Annealing, Breccia, Petrography, Regolith, Chondrites, Cosmic Rays, Iron Meteorites, Radioactive Decay, Trace Elements
Scientific paper
The Bholghati (howardite) has had a complex history. The consortium studies indicate that eucrite clasts show evidence of rapid crystallization followed by prolonged subsolidus annealing. Dark clasts are carbonaceous CM2 type. Bholghati bulk composition can be modeled by 55 percent eucritic, 45 percent diogenitic, and 3 percent dark clast components. The eucritic clasts show a LREE depleted pattern relative to HREEs, which is not typical of a normal eucrite. The LREE depletion requires two-stage melting from a chondritic source. The Bholghati evolution scenario is (1) early multiple magmatic events (4.53 Ga ago), producing eucrites and diogenites; (2) a metamorphic event (2-3 Ga ago) and prolonged subsolidus annealing; (3) fragmentation and low-temperature mixing of eucrites and diogenites; (4) low-velocity impact and admixing of carbonaceous material; (5) disruption of regolith and ejection of Bholghati 10-17 Ma ago; and (6) Bholghati fell on the earth in 1905.
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