Titanium isotope fractionation in solar system materials
نویسندگان
چکیده
New methods to determine the titanium (Ti) mass-dependent isotope fractionation of solar system materials high precision were developed by combining internally normalised Ti data with double-spike analyses utilising a 47Ti-49Ti double spike. The procedure includes three-stage ion-exchange separation isolate from sample matrix that provides high-purity fractions are necessary for high-precision analyses. Analyses aliquots spiked before and after demonstrate can be induced procedure. This outcome requires addition spike ion exchange in order accurately natural samples. Multiple an Alfa Aesar standard performed over eight months yielded reproducibility (2? deviation) 0.033‰ ?49/47Ti (differences 49Ti/47Ti relative OL-Ti standard). Terrestrial display 2? 0.018 0.031‰ ?49/47Ti. Titanium results three terrestrial USGS magmatic reference samples (AGV-2, BHVO-2 BCR-2) agree well literature therefore accuracy presented methodologies. Achondritic meteorites overall range 0.75‰ ungrouped achondrite NWA 7325 has more positive composition 0.64‰ compared all other investigated likely reflecting differentiation associated highly reducing conditions potentially oxide plagioclase formation. In contrast, eucrites -0.020 ± 0.070 -0.003 0.033 first acapulcoite (Dhofar 125; = 0.094 0.033) show only limited fractionation. Chondrites also relatively restricted 0.085‰ ?49/47Ti, including one calcium?aluminum rich inclusion (CAI) Allende two Rumuruti chondrites (NWA 753 755). Furthermore, overlaps Dhofar 125 indicating nebular processes induce Additionally, indicate thermal metamorphism produced marginal at bulk scale chondrites. Small variations between different meteorite evident, which might reflect heterogeneity. Importantly, Earth Moon overlap chondrites, acapulcoites within 2 deviation uncertainties.
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ژورنال
عنوان ژورنال: Chemical Geology
سال: 2021
ISSN: ['0009-2541', '1872-6836']
DOI: https://doi.org/10.1016/j.chemgeo.2020.120009