Genetics, age and crystallization history of group IIC iron meteorites
نویسندگان
چکیده
منابع مشابه
Iron meteorites: Crystallization, thermal history, parent bodies, and origin
We review the crystallization of the iron meteorite chemical groups, the thermal history of the irons as revealed by the metallographic cooling rates, the ages of the iron meteorites and their relationships with other meteorite types, and the formation of the iron meteorite parent bodies. Within most iron meteorite groups, chemical trends are broadly consistent with fractional crystallization, ...
متن کاملComposition and Thermal History of the Ivb Iron Meteorites
Introduction: Among the magmatic iron meteorites, group IVB irons have some unusual characteristics, such as high bulk Ni (15-18 wt%), high refractory elements (e.g., Ir), low volatile elements (e.g., Ga, Ge) [1, 2], fast cooling rates and a small parent body [3, 4]. IVB irons do not have a Widmanstatten pattern as in lower Ni IIIAB or IVA irons. Instead, IVB irons have a plessite structure wit...
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The concentrations of P, V, Cr, Fe, Co, Ni, Cu, Ga, Ge, As, Mo, Ru, Rh, Pd, W, Re, Os, Ir, Pt, and Au in the group IVB iron meteorites Cape of Good Hope, Hoba, Skookum, Santa Clara, Tawallah Valley, Tlacotepec, and Warburton Range have been measured by laser ablation inductively coupled plasma mass spectrometry. The data were fitted to a model of fractional crystallization of the IVB parent bod...
متن کاملCooling Rate Variations of Group Wa Iron Meteorites
Cooling rates of eight group IVA iron meteorites were determined using a modification of the Wood method where cooling rate curves are calculated as a function of central taenite Ni content and taenite half-width. The ma jor modification of the Wood method was to include the effect of? on the Ni solubility limits and Ni diffusion co efficients in the kamacite phase for each meteorite studied. T...
متن کاملCore crystallization and silicate-metal mixing in the parent body of the IVA iron and stony-iron meteorites
We have analyzed metallic and silicate phases in the IVA iron meteorites and two related stony irons, Steinbach and Sgo JoHo Nepomuceno. Analyses of bulk metal phases in the two stony irons using INAA show that they plot as close to the chemical trends within group IVA as most IVA irons, indicating a common source. Our fractional crystallization models for the IVA chemical trends suggest that t...
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2020
ISSN: 0016-7037
DOI: 10.1016/j.gca.2020.07.036