Oxygen isotope fractionation factors involving cassiterite (SnO2): II. determination by direct isotope exchange between cassiterite and calcite

Autor:	S. D. Mineev, Veniamin B. Polyakov, G. Hu, Robert N. Clayton
Rok vydání:	2005
Předmět:	Calcite Isotope Chemistry Radiochemistry Cassiterite Analytical chemistry Fractionation engineering.material Heat capacity Isotopes of oxygen Isotope exchange chemistry.chemical_compound Transition metal Geochemistry and Petrology engineering
Zdroj:	Geochimica et Cosmochimica Acta. 69:1301-1305
ISSN:	0016-7037
DOI:	10.1016/j.gca.2004.09.002
Popis:	Direct oxygen isotope fractionation between cassiterite and calcite has been investigated experimentally at 15 kbar with temperature ranging from 800 to 1000°C. Combined with the quartz-calcite fractionation measured with the same technique ( Clayton et al., 1989 ), the calcite-cassiterite and quartz-cassiterite oxygen isotope fractionations can be expressed as: Δ CaCO 3 − SnO 2 = 4.14 × 10 6 T − 2 Δ SiO 2 − SnO 2 = 4.52 × 10 6 T − 2 at temperatures higher than 600°C. These calibrations are in good agreement with those obtained from heat capacity and X-ray resonant data. The theory of using X-ray resonant data to calculate the reduced partition function ratios of transition elements that have at least one Mossbauer-sensitive isotope is evaluated with the current experimental result.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::59af5f98a7bc4a9107f4d209dad4a035 https://doi.org/10.1016/j.gca.2004.09.002 Zobrazit plný text záznamu Full Text from ScienceDirect