Role of phosphorus in lunar samples: a chemical study
The roles played by phosphorus present in lunar material may be important in understanding the evolution of the crustal rocks. Quantitative extraction of phosphorus and trace elements associated with possible phosphate phases is the ultimate objective of these studies. Because P may be present in glassy or microcrystalline mesostasis and also as discrete phosphate minerals and as phosphides, chemical procedures provide a tool for its determination along with its complements of trace elements. In these experiments 0.1 M acid was used as a phosphate-specific agent. One experiment was designed to measure how quantitatively P-related constituents are extracted. In consecutive leaching steps more p and REE were dissolved, 76 vs 26% P and 64 vs 37% Sm, from the finer grain sample split. This could be a grain size effect or it could be due to phase separations. Only small amounts of soluble phases remained after the initial 10 minute extraction. Phosphorus and REE are dilute acid soluble in amounts ranging up to 70%. They have sympathetically but are not necessarily highly correlated. Acid soluble fractions of KREEP-rich breccia 14312 and highland breccia 66095 matrix and melt rock clast have chondrite normalized REE patterns similar to that of apatite from a terrestrial gabbro. A different pattern is observed for mare basalt 75055 whole rock and pyroxene and an ilmenite-rich separate. The residues after the acid leach are always HREE enriched relative to the leached fractions. No KREEP-like REE/CH pattern was observed. A systematics for highland rocks based on P/sub 2/O/sub 5/ and Al/sub 2/O/sub 3/ is noted. Igneous KREEP rock 15386 and Apollo-16, Fe-rich, high-P/sub 2/O/sub 5/ glasses reported by Powell et al. (1975) play key roles. 5 figures, 1 table.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6337322
- Report Number(s):
- CONF-8203115-1; ON: DE83007816
- Resource Relation:
- Conference: 13. lunar and planetary conference, Houston, TX, USA, 15 Mar 1982; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Aspects of the history of 66095 based on trace elements in clasts and whole rock
Aspects of the history of 66095 based on trace elements in clasts and whole rock
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
58 GEOSCIENCES
BASALT
CHEMICAL ANALYSIS
CERIUM
SOLVENT EXTRACTION
COBALT
EUROPIUM
IRON
LANTHANUM
LUNAR MATERIALS
ORIGIN
LUTETIUM
PHOSPHORUS
SAMARIUM
SCANDIUM
SODIUM
TERBIUM
YTTERBIUM
APOLLO PROJECT
EXPERIMENTAL DATA
LEACHING
NITRIC ACID
QUANTITATIVE CHEMICAL ANALYSIS
TRACE AMOUNTS
ALKALI METALS
DATA
DISSOLUTION
ELEMENTS
EXTRACTION
HYDROGEN COMPOUNDS
IGNEOUS ROCKS
INFORMATION
INORGANIC ACIDS
MATERIALS
METALS
NONMETALS
NUMERICAL DATA
RARE EARTHS
ROCKS
SEPARATION PROCESSES
TRANSITION ELEMENTS
VOLCANIC ROCKS
400105* - Separation Procedures
640107 - Astrophysics & Cosmology- Planetary Phenomena
580300 - Mineralogy
Petrology
& Rock Mechanics- (-1989)