Oxygen three-isotope ratios of silicate reference materials determined by direct comparison with VSMOW-oxygen
نویسندگان
چکیده
منابع مشابه
Intermineral oxygen three-isotope systematics of silicate minerals in equilibrated ordinary chondrites.
High precision oxygen three-isotope ratios were measured for four mineral phases (olivine, low-Ca and high-Ca pyroxene, and plagioclase) in equilibrated ordinary chondrites (EOC) using a secondary ion mass spectrometer. Eleven EOCs were studied that cover all groups (H, L, LL) and petrologic types (4, 5, 6), including S1-S4 shock stages, as well as unbrecciated and brecciated meteorites. SIMS a...
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The separation factor, aM-0= ( 1 8 0 / 1 6 0 ) magnetite/' ( 1 8 0 / 1 6 0 ) atmospheric oxygen, between the magnetite crust of iron meteorites and atmospheric oxygen has been determined to be 0.9946 ± 0.0005. It is concluded that this fractionation of the oxygen isotopes is the consequence of an equilibrium isotope effect at high temperatures. It can be assumed that this is also valid for cosm...
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Introduction: Based on petrographic and ion probe investigation of small micrometeorites (150–250 μm), previous studies (e.g. [1]) have concluded that 99% of them should come from carbonaceous, possibly cometary parent bodies (CM/CR related). Our oxygen isotope measurements of 33 large (>500 μm) silicate type cosmic spherules (CS), using IR-laser fluorination/mass spectrometry, indicate that 30...
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ژورنال
عنوان ژورنال: GEOCHEMICAL JOURNAL
سال: 2008
ISSN: 0016-7002
DOI: 10.2343/geochemj.42.309