TOWARDS AN EVALUATION OF SELF-SHIELDING AT THE X-POINT AS THE ORIGIN OF THE OXYGEN ISOTOPE ANOMALY IN CAIs
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Mean Oxygen-isotope Composition of the Protosolar Molecular Cloud Silicate Dust
Oxygen-isotope composition of the solar wind returned by GENESIS indicates that the Sun is 16 O-rich (Δ 17 O SMOW = −26±6‰) [1], supporting one of predictions of the CO self-shielding models [2−4]. The self-shielding models [3,4] assume that both the solids and gas were similarly 16 O-rich (Δ 17 O ~ −25‰), and solids subsequently evolved towards the terrestrial value as a result of CO self-shie...
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Bentonite deposits of economic interest are widespread in Tashtab Mountains (Khur), east of Isfahan province, Iran. Several bentonite deposits have been developed in this area as a result of Eocene volcanic alteration. These deposits are classified as Khur bentonite horizon. XRD analyses reveal that alteration products consist of Na-montmorillonite, kaolinite, quartz, calcite, and crystobalite....
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Motivation: Mass-independently fractionated oxygen isotopes in CAI [1] are widely assumed to be due to self-shielding (hereafter SS) of CO in early solar environments [e.g. 2]. However, the SS process necessarily leads to an unusual prediction that a mean solar oxygen isotopic composition differs from most of planetary bodies, but is close to a typical CAI oxygen. The latest results of the Gene...
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Introduction: In a recent paper, R.N. Clayton made the suggestion that self shielding by CO in the early solar nebula could have been the origin of the anomalous array of
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تاریخ انتشار 2003