Experimental partitioning studies near the Fe-FeS eutectic, with an emphasis on elements important to iron meteorite chronologies (Pb, Ag, Pd, and Tl)

Journal Article · Fri Jan 01 00:00:00 EST 1993 · Geochimica et Cosmochimica Acta; (United States)

DOI:https://doi.org/10.1016/0016-7037(93)90443-Z· OSTI ID:6736188

Jones, J H ^[1]; Hart, S R ^[2]; Benjamin, T M ^[3]

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1. NASA Johnson Space Center, Houston, TX (United States)
2. Woods Hole Oceanographic Institution, MA (United States)
3. Los Alamos National Lab., NM (United States)

Partition coefficients (D) for metal/sulfide liquid, troilite/sulfide liquid, and schreibersite/sulfide liquid have been experimentally determined for Ag, Au, Mo, Ni, Pb, Pd, and Tl. With these partition coefficients, it should be possible to better understand the [sup 107]Pd-[sup 107]Ag and [sup 205]Tl-[sup 205]Pb systems of iron meteorites. In general, the schreibersite/metal and troilite/metal partition coefficients for compatible' elements are quite similar to those inferred from natural assemblages. In contrast, these same partition coefficients for incompatible' elements often do not even qualitatively agree with analyses of iron meteorites. The authors suggest that analyses of incompatible elements in iron meteorites may sometimes be dominated by minor/trace phases. Identification of such phases may allow refinement of the initial isotopic composition of Pb in the early solar system. If the trace impurity model is correct, it may also be possible to reconcile iron meteorite cooling rates inferred from silver isotopic systematics with those deduced from metallography. 36 refs., 2 figs., 6 tabs.

• OSTI ID: 6736188
• Journal Information: Geochimica et Cosmochimica Acta; (United States), Vol. 57:2; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
IRON
EUTECTICS
IRON METEORITES
QUANTITATIVE CHEMICAL ANALYSIS
IRON SULFIDES
LEAD
ISOTOPE RATIO
SOLAR SYSTEM
COOLING
GOLD
METALLOGRAPHY
MOLYBDENUM
NICKEL
PALLADIUM
PARTITION
SILVER
SULFIDES
THALLIUM
TROILITE
CHALCOGENIDES
CHEMICAL ANALYSIS
ELEMENTS
IRON COMPOUNDS
METALS
METEORITES
MINERALS
PLATINUM METALS
PYRRHOTITE
SULFIDE MINERALS
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400100* - Analytical & Separations Chemistry