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Showing 1 to 20 of 54 for “"Chondrite"”.
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Rb-Sr age determination of the carbonaceous chondrite "Murray"
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1964.
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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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Characterization and chronology of refractory inclusions (CAIs) in the CV3 chondrite NWA 4502
… 1 and 4a, Type B CAIs 5, 6 and 7) from the CV chondrite North West Africa (NWA) 4502 the second largest CV chondrite so far after Allende. At a mineralogical level, NWA 4502 is rather pristine. In comparison with CAIs from Allende and other CV chondrites, CAIs from the NWA 4502 show many …
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Characterization and chronology of refractory inclusions (CAIs) in the CV3 chondrite NWA 4502
… 1 and 4a, Type B CAIs 5, 6 and 7) from the CV chondrite North West Africa (NWA) 4502 the second largest CV chondrite so far after Allende. At a mineralogical level, NWA 4502 is rather pristine. In comparison with CAIs from Allende and other CV chondrites, CAIs from the NWA 4502 show many …
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Testing The Gefion Family As A Possible Parent Body For The L-Chondrite Meteorites
<p>The L-chondrite meteorites are the most abundant meteorites falling to Earth. Identifying a parent body for them has been an important goal of asteroid science for more than thirty years. A link between the two could help to decipher the history of thermal regimes and evolutionary processes that …
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I. Aspects of lithospheric evolution on Venus. ; II. Thermal and collisional histories of chondrite parent bodies
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1989.
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Generating A Characterization Method Utilizing The Visible (0.6-1.0 μm) Peak Feature To Aid In Identification Of Ordinary Chondrite Parent Bodies
… charge transfer and Band I of 224 ordinary chondrite (OC) samples to analyze the peak position shifts with respect to subtypes H-, L- and LL- to generate a new characterization method. This method may make it possible to unite the datasets between the meteorites and asteroids to further …
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The chlorine isotope composition of chondrites : evidence for a single nebular reservoir and the effects of secondary processes on chondrite parent bodies
The chlorine isotope composition of chondrites provides information about isotopic reservoirs that were present in the solar nebula and the effect of secondary processes on the isotopic composition. We analyzed twenty chondrites that included both unaltered (type 3) and altered (types 1-2, 4-6) …
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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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Using oxygen and carbon stable isotopes, 53Mn-53Cr isotope systematics, and petrology to constrain the history of carbonates and water in the CR and CM chondrite parent bodies
… isotopic study of carbonates in the paired CM1 chondrites, ALH 84049 and ALH 84051, in an effort to understand the origin and chronology of formation of carbonates in the most heavily altered CM chondrites. Dolomite is strongly compositionally zoned (Ca, Mg, Fe, Mn), indicating very …
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The Elastic Properties of Carbonaceous Chondrites
… of clasts of asteroid 25143 Itokawa (LL-chondrite) and Tagish Lake meteorites (ungrouped C2 carbonaceous chondrite) indicate variation in fragmentation behavior. The steeper size distribution of the carbonaceous lithology apparently reflects its lower strength. A comparison between the …
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Low rare earth element concentration impact glass from the K/T Boundary at Beloc
… REE composition which is enriched normalized to chondrite. The other glass type, however, displays a meteoritic REE composition signature. REE patterns for this glass are nearly flat when plotted normalized to chondrite with an average La/Sm ratio of 1.51 compared to 2.69 for crustal glass. Major …
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Modeling target rock composition of two impact events
… Gorge–Kuruman pair corresponds to an enstatite chondrite, whereas the Paraburdoo–Reivilo pair reflects an ordinary chondrite source. Both impacts indicate contributions from continental crust and the lack of mantle-derived material, supporting the hypothesis that the younger …
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Effects of Terrestrial Weathering on Rare Earth Element Concentrations and Sulfur Isotopic Signatures of Carbonaceous and Ordinary Chondrites
<p>Understanding the effects of weathering of chondrites is essential to gaining accurate and useful information about the formation of our solar system, as well as a more detailed account of the mobilization of chondritic compounds when they encounter terrestrial conditions. Elemental …
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Evolution Of Water Reservoirs In The Early Solar System Through Their Oxygen Isotopic Composition
… to three suites of meteorites: Carbonaceous chondrites (CI and CM), SNC meteorites (four meteorites) and a selection of Antarctic samples, three eucrites and one ordinary chondrite. Results were used to constrain models of the origin of Solar System water and its subsequent interaction on the …
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Aspects of the chemistry of some stony meteorites
… 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, Ba and Ni) …
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Morning light : the secret history of the Tagish Lake Fireball
… who suspected it was a carbonaceous chondrite. Amongst the public, however, reactions to the event were varied, and conspiracy theorists emerged, claiming that the meteor had been a failed weapons test conducted by the United States military. A week after the fall, outdoorsman Jim …
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Classification of a Meteorite found near Colgate, North Dakota
… meteorite was determined to be an H4 ordinary chondrite and is the largest meteorite yet found in North Dakota.</p>
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Mineralogy of Eudialyte Group Minerals From the East Hill Suite Of the Mont Saint-Hilaire Alkaline Plutonic Complex, Including an Alternative Site-Assignment Algorithm & A Proposed Classification System
… exhibited a negative neodymium anomaly in chondrite-normalized data. This supports data from other investigators that point to a preintrusion fractionation event in the underlying mantle. Potassium content of the eudialyte group minerals from the East Hill Suite was restricted to a narrow …
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Salobo Sequence, Carajas, Brazil: Geology, Geochemistry And Metamorphism
… LREE fractionation and almost flat HREE chondrite-normalized patterns. Silicate-type iron formation grades to an aluminous type and finally to metagraywackes. Geochemical studies show a continuous compositional variation between both iron formation types, with gradual Al, K, Ti and Zr …
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