Observations on a 10-kg Graphite Nodule from the Canyon Diablo (iab-mg) Iron Meteorite
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THE MULTIPLE SULFUR ISOTOPIC COMPOSITION OF IRON METEORITES: IMPLICATIONS FOR NEBULAR EVOLUTION By
Title of Document: The Multiple Sulfur Isotopic Composition of Iron Meteorites: Implications for Nebular Evolution. Michael Ariel Antonelli, Master of Science, 2013. Directed By: Professor James Farquhar, Department of Geology and Earth System Sciences Interdisciplinary Center, University of MarylandCollege Park Multiple sulfur isotopic measurements of troilite from 61 different iron meteorites...
متن کاملENDEMIC Ru ISOTOPIC ANOMALIES IN IRON METEORITES AND IN ALLENDE
Small variations for Mo isotopes have been observed recently in the Allende meteorite and in iron meteorites, mesosiderites, and pallasites, using ICP-MS [1]. Large effects for Mo have been reported for leaches of Orgueil [2] and in SiC and graphite from Murchison [3-5]. Variations for Mo in bulk Allende and in Murchison have also been presented by NTIMS [6]. Effects in Ru isotopes can define f...
متن کاملThe Partitioning of Siderophile Elements between Kamacite and Cohenite
Introduction: Iron meteorites are asteroidal fragments that crystallized from Fe-Ni-X liquids, where X = S, C, and/or P. It is well known that the partitioning of siderophile (iron-loving) elements in iron metal is strongly influenced by the amount of S in the liquid (e.g., [1]). Chabot et al. [2] have recently shown that the presence of C in the liquid increases the compatibility of most sider...
متن کاملThallium isotope constraints on Earth’s accretion
The extinct radionuclide Pb decays to Tl with a halflife of 15 Myr. The former presence of Pb in the solar system was recently inferred from a Pb-Tl isochron that was obtained for seven metal samples from the IAB iron meteorites Canyon Diablo and Toluca [1]. New Tl isotope data obtained for eight carbonaceous chondrites are in full accord with this isochron [2]. Several lines of evidence (based...
متن کاملOn the Distribution of Major and Trace Elements Between Metal and Phosphide Phases of Some Iron Meteorites
The concentrations of Fe, Ni, Co, P, Cu, Ga, Ge, Mo, Ru, Rh, Pd, W, Ir and Pt in the phosphides and the metal of the coarse octahedrites Campo del Cielo, Canyon Diablo, Cranbourne and Sardis, the coarsest octahedrite Säo Juliäo de Moreira and the hexahedrites Braunau and Lombard have been determined by spark source mass spectrometry. Striking differences are observed of the element contents bet...
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