THE RANGE OF INITIAL Be/Be RATIOS IN THE EARLY SOLAR SYSTEM: A RE-ASSESSMENT BASED ON ANALYSES OF NEW CAIs AND MELILITE COMPOSITION GLASS STANDARDS
نویسندگان
چکیده
منابع مشابه
Beryllium-boron Systematics of Refractory Inclusions in Cr2 and Cv3 Chondrites: Evidence for Be Heterogeneity
Introduction: Beryllium-10 decays to B with a half-life of 1.4 Ma, and is of interest because it is produced almost exclusively by irradiation reactions, unlike other short-lived radionuclides [1]. Previous studies have shown that the initial Solar System Be/Be ratio was in the range of ~10-10 [2-9], higher than the value expected from the galactic background (~10) [2]. While this live Be in th...
متن کاملSi and Mg Isotope Fractionations in Melilite in Type B Cais
Introduction: Si and Mg isotopic compositions are indicators of evaporation processes experienced by CAIs [1]. Bulk Si and Mg isotopic compositions (up to ~5 permil/amu for Si and ~11 permil/amu for Mg) have been reported by [2]. Isotopic heterogeneity within CAIs is of interest because it may reveal how evaporation processes occurred. It may also reveal if secondary processes such as recondens...
متن کاملFORMATION OF THE MELILITE MANTLE OF THE TYPE B1 CAIs: EXPERIMENTAL SIMULATIONS
Introduction: Type B Ca-Al-rich inclusions (CAIs) in carbonaceous chondrites represent the oldest materials known to have formed in the solar system, most likely by condensation from a gas of solar composition followed by reheating to ~1400°C and slow cooling at <50°C hr [1]. This reheating resulted in the igneous textures of Type B CAIs, the fractional loss of the moderately volatile elements ...
متن کاملRare Earth Element Measurements of Melilite and Fassaite in Allende Cai by Nanosims
Introduction: The rare earth elements (REEs) are concentrated in CAIs by ~20 times the chondritic average [e.g., 1]. The REEs in CAIs are important to understand processes of CAI formation including the role of volatilization, condensation, and fractional crystallization [1,2]. REE measurements are a well-established application of ion microprobes [e.g., 3]. However the spatial resolution of RE...
متن کاملMelilite: a Petrogenetic Indicator in Refractory Inclusions
Introduction: Our collective knowledge of the thermodynamic properties of gas, solid, and liquid phases rests on over a century of experimental work. Over the last 35 years this work has been incorporated into increasingly more rigorous models to investigate nebular condensation [1-4], liquid-crystal equilibrium [5,6], and the evaporation of silicate liquids [7-11]. These tools can be combined ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2017