The Bholghati howardite: Chemical study

Journal Article · Wed Aug 01 00:00:00 EDT 1990 · Geochimica et Cosmochimica Acta; (USA)

DOI:https://doi.org/10.1016/0016-7037(90)90042-J· OSTI ID:6400121

Laul, J C; Gosselin, D C ^[1]

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1. Battelle Pacific Northwest Laboratory, Richland, WA (USA)

Bholghati is homogeneous on a cm scale in major element composition, but heterogeneous in trace elements such as the rare earth elements (REEs). The REEs are concentrated in accessory phosphates, and their sampling can influence the REE patterns of eucritic clasts which, in turn, can govern the bulk REE patterns. Bholghati can be reasonably modeled with 56% eucritic, 45% diogenitic, and 3% dark clast components; however, an additional component (feldspathic) is required to match the bulk composition. Dark clasts represent carbonaceous CM type material that was admixed with other components during regolith formation on the eucrite parent body (EPB). One eucritic clast (fine-grained) is light REE (LREE) depleted relative to heavy REE (HREE), which is unusual in normal eucrites. The LREE depletion pattern cannot be modeled from one-stage partial melting of a chondritic source; however, it can be modeled from a non-chondritic source depleted in LREEs or multi-stage melting of a chondritic source, provided that the LREE depletion is not from undersampling of phosphates. Bholghati has a complex history that involved early multiple magmatic events, later annealing, and fragmentation and low-temperature mixing of eucritic, diogenitic, and carbonaceous components on the howardite parent body.

• OSTI ID: 6400121
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Journal Name: Geochimica et Cosmochimica Acta; (USA) Vol. 54:8; ISSN GCACA; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
640106 -- Astrophysics & Cosmology-- Cosmology
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
CHEMICAL COMPOSITION
CHONDRITES
CONCENTRATION RATIO
COSMOLOGICAL MODELS
ELEMENT ABUNDANCE
ELEMENTS
GEOLOGIC HISTORY
MAGMATISM
MATHEMATICAL MODELS
METALS
METEORITES
MINERALOGY
MINERALS
PETROCHEMISTRY
PETROGENESIS
PHOSPHATE MINERALS
RARE EARTHS
STONE METEORITES
TRACE AMOUNTS