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Showing 1 to 20 of 87 for “"meteorites"”.
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Antarctic Alteration of Meteorites
The discovery of large accumulations of meteorites in Antarctica is comparably recent, with annual collection expeditions beginning in 1974. Since then, over 50,000 meteorites have been recovered from the icefields of Antarctica. Many of those meteorites have had long residence times of up to 2 Ma …
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Martian meteorites as windows into planetary volcanism: insights from olivine-phyric shergottite meteorites
Martian meteorites are the only samples currently available from the surface of Mars to study in terrestrial laboratories and can provide valuable insight into magmatic processes and the planet's geological evolution. With more meteorites being found every year, researchers no longer need to look …
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Nitrogen-heterocyclic compounds in meteorites
Contains fulltext : mmubn000001_027004074.pdf (Publisher’s version ) (Open Access)
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Trace element studies in meteorites and rocks, and the origin of meteorites by William Hamet Pinson, Jr.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology, 1952.
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The Rb87 -Sr87 age of stony meteorites.
Massachusetts Institute of Technology. Dept. of Geology and Geophysics. Thesis. 1965. Ph.D.
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Noble gases anomalies in terrestrial ores and meteorites
<p>"Analyses of the content and isotopic composition of xenon and krypton in terrestiral ores containing tellurium, selenium or iodine resulted in the following conclusions: 1. The double beta-decay half-life for ¹³⁰Te is 2.51 x 10²¹ years from analysis of tellurobismuthite from Boliden, Sweden and …
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GENETICS, AGES, AND CHEMICAL COMPOSITIONS OF IRON METEORITES
… of genetic isotopic compositions of iron meteorites with metal-silicate segregation ages suggests that the isotopic composition of the NC reservoir changed with time. By contrast, no such age-linked changes in the genetic isotopic compositions of iron meteorites from the CC reservoir are …
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Aspects of the chemistry of some stony meteorites
… processes were involved in the genesis of these meteorites. Theories for the origin of these meteorites have been examined in the light of these inter-element relationships. It is concluded that mixing of diogenitic and eucritic material was responsible for the formation of howardites, while …
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Silicate meteorite structures and the origin of the meteorites
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1958.
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Magnetic Properties of Iron Meteorites and Their Parent Bodies
… of their magnetic fields are preserved in meteorites and asteroids. These records offer the opportunity to better characterize the intrinsic properties of this primordial population. Here I present a series of paleomagnetic studies conducted on iron meteorites, potential carriers of such …
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Fe oxidation and weathering studies of Antarctic and SNC meteorites
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmosphere and Planetary Sciences, 1987.
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Thermal histories of CB meteorites: Constraints from compositions and microstructures of sulfides
… of metal (>40%) make them a distinct group of meteorites. The origin of CBs is highly debated, but these meteorites are thought to have formed in an impact-generated vapor plume 4.563 Ga ago [Amelin et al., 2005; Krot et al., 2005], rather than in the solar nebula. This study focuses on …
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Isotopic and Elemental Compositions of Stardust and Protosolar Dust Grains in Primitive Meteorites
… than oxide grain abundances in all the three meteorites.
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The History of Water and Other Associated Volatiles in Howardite-Eucrite-Diogenite Meteorites
… System. The howardite, eucrite, diogenite (HED) meteorites form the largest suite of rocks representing a differentiated basaltic asteroid (4 Vesta) and are some of the oldest igneous rocks in the Solar System. Understanding their volatile histories, therefore, can help us to constrain some of …
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Compositional Analysis of the Martian Meteorites Northwest Africa 6342 and Northwest Africa 10961
… of melt pockets and veins within both of these meteorites. Poikilitic zones have Cr-rich spinels in the form of chromite while the nonpoikilitic areas exhibit Ti-rich spinels. NWA 6342 and NWA 10961 have experienced high levels of shock metamorphism as demonstrated by substantially fractured …
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Some aspects of the geochemistry of gallium in silicate rocks and stony meteorites
… of gallium on a routine basis in rocks and meteorites at concentrations down to or less than 1 ppm Ga with a precision (c.o.v.) at the 10 ppm level and above of 1-2% (1s); to apply this technique to the determination of Ga in rocks and meteorites; by critically examining the high quality …
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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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New Mineralogical and Geochemical Characterization of Martian Meteorites: Implications for Habitability and Astrobiological Exploration of Mars
… of primary and secondary phases in Martian meteorites Los Angeles, Zagami, and Nakhla was performed. This novel approach assesses their potential to host life and build on previous studies that focused on either astrobiological or geological factors. These meteorites were found to contain …
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