Results 151 to 160 of about 40,246 (197)
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The Eagle, Nebraska Enstatite Chondrite (EL6)
Meteoritics, 1988Abstract— The Eagle enstatite chondrite (presently 9.2 kg) was an observed fall in October 1946. It was not recovered until the spring of 1947 and was allowed to remain out‐of‐doors until 1984. The meteorite appears relatively unweathered, although the absence of oldhamite and the depletion of calcium indicates it has suffered chemical weathering ...
E. Olsen, G. Huss, E. Jarosewich
semanticscholar +2 more sources
The Chemical Composition of the Earth: Enstatite Chondrite Models
Earth and Planetary Science Letters, 2010Manuel Moreira +2 more
exaly +2 more sources
Calcium-Aluminum-Rich Inclusions From Enstatite Chondrites: Indigenous or Foreign?
Science, 2000 The primary mineral assemblages and initial 26 Al/ 27 Al ratios of rare calcium-aluminum–rich inclusions (CAIs) from enstatite (E) chondrites are similar to those of CAIs from other chondrite ...
Yunbin Guan +2 more
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Equilibration temperatures in enstatite chondrites
Geochimica et Cosmochimica Acta, 1974Equilibration temperatures for enstatite chondrites are calculated using a method suggested by Larimer (1968). The temperatures range from 640 to 840 C. The method yields temperatures which, in principle, are correct on a relative scale, but the absolute error may be as large as 150 C.
John W Larimer, Peter R Buseck
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Bismuth and 208Pb microdistributions in enstatite chondrites
Geochimica et Cosmochimica Acta, 1979Polished sections of 5 enstatite chondrites have been irradiated with 30 MeV ^4He ions to produce the alpha-radioactive nuclei ^(211)At and ^(210)Po from ^(209)Bi and ^(208)Pb, respectively. The distribution of alpha activity can be mapped, using cellulose nitrate as an alpha track detector, to give the corresponding Bi or Pb distributions in the ...
Woolum, Dorothy S. +3 more
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Mineral chemistry and the origin of enstatite in unequilibrated enstatite chondrites
Geochimica et Cosmochimica Acta, 1998Abstract A comprehensive study of the petrography, cathodoluminescence (CL), rare earth element (REE) abundances, and magnesium and silicon isotopic compositions of enstatite, the major mineral in unequilibrated enstatite chondrites (UECs), is reported.
Weibiao Hsu, Ghislaine Crozaz
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Chromium Isotopic Homogeneity Between the Moon, the Earth, and Enstatite Chondrites
Earth and Planetary Science Letters, 2018 International audienceAmong the elements exhibiting non-mass dependent isotopic variations in meteorites, chromium (Cr) has been central in arguing for an isotopic homogeneity between the Earth and the Moon, thus questioning physical models of Moon ...
Bérengère Mougel +2 more
exaly +2 more sources
Shock metamorphism of enstatite chondrites
Geochimica et Cosmochimica Acta, 1997Abstract We have extended the shock-metamorphism classification scheme of Stoffler et al. (1991) to account for shock effects in orthopyroxene and applied it to sixty enstatite chondrites. Orthopyroxene exhibits the following sequence of progressive shock effects: shock stage S1 (unshocked), sharp optical extinction; S2 (very weakly shocked ...
Alan E. Rubin +2 more
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Geochimica et Cosmochimica Acta, 1966
Abstract Fifteen enstatite chondrites have been recognized: Abee, Adhi Kot, Atlanta, Bethune, Blithfield, Daniel's Kuil, Hvittis, Indarch, Jajh deh Kot Lalu, Khairpur, Kota-Kota, Pillistfer, St. Mark's, Saint-Sauveur and Ufana. Their essential minerals are enstatite and/or clinoenstatite (40–60%), kamacite (20–28%), troilite (7–15%), and sometimes ...
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Abstract Fifteen enstatite chondrites have been recognized: Abee, Adhi Kot, Atlanta, Bethune, Blithfield, Daniel's Kuil, Hvittis, Indarch, Jajh deh Kot Lalu, Khairpur, Kota-Kota, Pillistfer, St. Mark's, Saint-Sauveur and Ufana. Their essential minerals are enstatite and/or clinoenstatite (40–60%), kamacite (20–28%), troilite (7–15%), and sometimes ...
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Meteoritics & Planetary Science
The enstatite chondrite class is known to have complex thermal histories, often interpreted to include impact melting and shock metamorphism. Highly equilibrated (type 6) EH group enstatite chondrites are rare and thought to have formed through ...
M. L. Gray +3 more
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The enstatite chondrite class is known to have complex thermal histories, often interpreted to include impact melting and shock metamorphism. Highly equilibrated (type 6) EH group enstatite chondrites are rare and thought to have formed through ...
M. L. Gray +3 more
semanticscholar +1 more source