Rare earth elements in Ca-phosphates of Allende carbonaceous chondrite

Journal Article · Tue Sep 01 04:00:00 EDT 1987 · Meteoritics; (United States)

DOI:https://doi.org/10.1111/j.1945-5100.1987.tb00618.x· OSTI ID:5275017

Ebihara, M; Honda, M

The Ca-phosphate phases in the Allende CV3 meteorite were selectively dissolved in ammoniacal EDTA solution and measured for abundances of the rare earth elements (REE) by radiochemical neutron activation and mass-spectrometric isotope dilution analyses. The REE abundances in CA-phosphates of Allende are remarkably different from those of ordinary chondrites. All the REE except Eu were observed to be enriched by factors of 50-100 relative to the Cl values. This is 3-4 times lower than concentrations of REE in the ordinary-chondrite phosphates. Allende phosphates have a small positive Eu anomaly, in contrast to the large negative Eu anomaly in phosphates from ordinary chondrites. Though the positive Eu anomaly in Allende Ca-phosphates is puzzling, the lack of a negative Eu anomaly in Allende Ca-phosphates suggests that they never have been in equilibrium with Allende coarse-grained Ca, Al-rich inclusions or their precursor materials. 42 references.

• Research Organization: Gumma Univ. (Japan); Nihon Univ. (Japan)
• OSTI ID: 5275017
• Journal Information: Meteoritics; (United States), Journal Name: Meteoritics; (United States) Vol. 22; ISSN MERTA
• Country of Publication: United States
• Language: English

Related Subjects

640107* -- Astrophysics & Cosmology-- Planetary Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACTIVATION ANALYSIS
ALKALINE EARTH METAL COMPOUNDS
BARYON REACTIONS
CALCIUM COMPOUNDS
CALCIUM PHOSPHATES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHONDRITES
ELEMENTS
EUROPIUM
HADRON REACTIONS
MASS SPECTROSCOPY
METALS
METEORITES
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOSPHATES
PHOSPHORUS COMPOUNDS
RARE EARTHS
SPECTROSCOPY
STONE METEORITES