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Showing 1 to 9 of 9 for “"enstatite chondrites"”.
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Exploring the Enstatite Chondrites: Modal Abundances, Metamorphic History, and Volatile Challenges
… thermal histories, and volatile inventories of enstatite chondrites (ECs). A diverse set of ECs is analyzed to capture the broad variability within this meteorite class. Chapter 1 presents a comparative analysis of mineral abundances using automated point counting, X-ray diffraction analysis, …
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Paleomagnetic Investigation of Enstatite Chondrite Chondrules: Implications for the Solar Nebula
… transport systems. Paleomagnetic measurements of chondrites have constrained the intensity of the nebular field between ∼3-7 AU. Previous work on two dusty olivine chondrules from high iron enstatite chondrites with variable kamacite grain sizes implied strong inner nebular field (∼1-2 AU) …
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NATURAL ANALOGUES OF PLANET MERCURY’S SURFACE: MINERALOGICAL AND SPECTROSCOPIC ASPECTS
… is dominated by Na-rich plagioclase, FeO-poor enstatite and forsterite, and Mg–Ca–Fe sulphides, suggesting that Mercury formed in the inner part of the protoplanetary disk from highly reduced precursor materials. However, the interpretation of Mercury’s spectral properties remains complex due …
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THE CONCENTRATION OF HYDROGEN IN INCOMPLETELY AND WHOLLY MELTED TERRESTRIAL BUILDING BLOCKS
… compositions to the bulk Earth. Furthermore, chondrites derived from the inner solar system (e.g., ordinary and enstatite chondrites) are H-poor relative to carbonaceous chondrites. Similarly, all melted planetesimals are commonly assumed to be anhydrous. However, recent analyses of enstatite …
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Planetary Materials Science and Astrobiology
… likely precursors to terrestrial planets (enstatite chondrites); and important possible planetary habitats including post-impact hydrothermal mineral deposits and their associated weathering assemblages; and the fossilization of records of an ecosystem based on the microbial leaching of …
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Mineralogy and bulk chemistry of chondrules and matrix in petrologic type 3 chondrites : implications for early solar system processes
… various textural types in four petrologic type 3 chondrites: MET 00526 (L3.05), MET 00426 (CR3.0), Kainsaz (CO3.2) and Kakangari (K3). Bulk compositions of twenty chondrules in each meteorite were determined with modal recombination analysis. This study provides a self-consistent dataset that …
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Aspects of the chemistry of some stony meteorites
… missing] Ten eucrites, four howardites, three enstatite achondrites, eight HL chondrites, the one known chassignite and a chondrite inclusion from the Cumberland Falls achondrite have been analysed for major, minor and some trace elements (viz. Fe, Mn, Ca, Cr, P, Si, Al, Mg, Na, K, Sr, Zr, Y, …
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Isotopic and Elemental Compositions of Stardust and Protosolar Dust Grains in Primitive Meteorites
… of presolar silicate grains from the primitive chondrites, Acfer 094, SAH 97096, and ALHA77307. Oxygen-anomalous, C-anomalous, and N-anomalous grains were identified by O, C, and N isotopic imaging, respectively, using the NanoSIMS 50. Subsequently, the elemental compositions of the grains …
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Iron Isotope Cosmochemistry
… samples including carbonaceous, ordinary, and enstatite chondrites, aubrites, brachinites, HED meteorites: howardites, eucrites and diogenites), martian meteorites, angrites, lunar meteorites, lunar regolith and ungrouped meteorites. I discuss iron isotope fractionations among these …