Results 191 to 200 of about 11,238 (241)
Earth and Planetary Science Letters, 2022 International audienceAmong primitive meteorites, CR chondrites have peculiar isotopic compositions, the origin of which is uncertain and may have involved contributions from primordial molecular cloud material or the chondrites' formation and ...
Emmanuel Jacquet +2 more
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The Bencubbin chondrite breccia and its relationship to CR chondrites and the ALH85085 chondrite
Meteoritics, 1990Abstract— Bencubbin is an unclassified meteorite breccia which consists mainly of host silicate (∼40 vol.%) and host metal (∼60%) components. Rare (< 1%) ordinary chondrite clasts and a dark xenolith (formerly called a carbonaceous chondrite clast) are also found.
Michael K. Weisberg +2 more
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Science, 1965
Whereas most chondrites contain sodic plagioclase (or occasionally maskelynite, its glassy equivalent), a few are free of feldspar. Absence of plagioclase is correlated with the presence of calcium-poor clinopyroxene (pigeonite sensu lato ) instead of orthopyroxene.
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Whereas most chondrites contain sodic plagioclase (or occasionally maskelynite, its glassy equivalent), a few are free of feldspar. Absence of plagioclase is correlated with the presence of calcium-poor clinopyroxene (pigeonite sensu lato ) instead of orthopyroxene.
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The compositional classification of chondrites: II The enstatite chondrite groups
Geochimica et Cosmochimica Acta, 1982We present new data from a neutron activation analysis of four enstatite chondrites including the taxonomically important St. Sauveur, and discuss the classification of enstatite chondrites. The enstatite chondrites can be divided into two compositionally distinct sets; in one set abundances of nonrefractory siderophiles and moderately volatile ...
Derek W. Sears +2 more
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The compositional classification of chondrites: III. Ungrouped carbonaceous chondrites
Geochimica et Cosmochimica Acta, 1982Abstract Seven carbonaceous chondrites (Allan Hills A77307, Adelaide, Al Rais, Coolidge, Grosnaja, Karoonda and Renazzo) with uncertain classifications were analyzed by instrumental and radiochemical neutron activation analysis for 29 elements: Na, Mg, Al, K, Ca, Sc, V, Cr, Mn, Fe, Co, Ni, Zn, Ga, Ge, As, Se, Br, Ru, Cd, Sb, La, Sm, Eu, Yb, Lu, Os ...
Gregory W. Kallemeyn, John T. Wasson
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The compositional classification of chondrites: VII. The R chondrite group
Geochimica et Cosmochimica Acta, 1996Bulk compositional and petrographic data clearly define the new R (Rumuruti) group of chondrites consisting of Rumuruti (the only fall), ALH85151, Acfer 217, Carlisle Lakes, Dar al Gani 013, PCA91002, PCA91241, Y-75302, Y-793575, and Y-82002. Compositional, petrographic, rare-gas, and 0-isotopic data strongly suggest that PCA91002 and PCA91241 are ...
Gregory W. Kallemeyn +2 more
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Journal of Geophysical Research, 1967
The Hg abundance has been determined in chondritic meteorites by neutron activation and separation by volatilization over a series of temperatures ranging from 110° to 1200°C. Hg is highly fractionated between classes of chondrites and within the classes themselves.
G. W. Reed, S. Jovanovic
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The Hg abundance has been determined in chondritic meteorites by neutron activation and separation by volatilization over a series of temperatures ranging from 110° to 1200°C. Hg is highly fractionated between classes of chondrites and within the classes themselves.
G. W. Reed, S. Jovanovic
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Meteoritics, 1981
According to its petrography, uniform olivine, Fa23.8, and pyroxene, Fs20.4, a total iron content of 22.9 wt % Fe, 16.4 wt % FeO and an FeO/FeO + MgO ratio of 24.7 mol %, the Tambakwatu is a veined, intermediate hypersthene (Cia) or L6 chondrite.
K. Fredriksson +3 more
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According to its petrography, uniform olivine, Fa23.8, and pyroxene, Fs20.4, a total iron content of 22.9 wt % Fe, 16.4 wt % FeO and an FeO/FeO + MgO ratio of 24.7 mol %, the Tambakwatu is a veined, intermediate hypersthene (Cia) or L6 chondrite.
K. Fredriksson +3 more
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Meteoritics, 1972
The Seoni (India) chondrite is an H6 group ordinary chondrite that contains olivine (Fa, 19.7 mole%), orthopyroxene (Fs, 15.9 mole%), clinopyroxene, plagioclase (An, 10.3; Or, 5.6 mole%), together with chromite, troilite, kamacite, taenite, chlorapatite, and whitlockite.
T. E. Bunch, A. P. Mall, C. F. Lewis
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The Seoni (India) chondrite is an H6 group ordinary chondrite that contains olivine (Fa, 19.7 mole%), orthopyroxene (Fs, 15.9 mole%), clinopyroxene, plagioclase (An, 10.3; Or, 5.6 mole%), together with chromite, troilite, kamacite, taenite, chlorapatite, and whitlockite.
T. E. Bunch, A. P. Mall, C. F. Lewis
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Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1988
Abstract A compilation of data on 78 elements in the nine groups of chondrites shows each to be isochemical with the exception of a few volatiles. With the exception of the most volatile elements, the groups have solar abundances to within a factor of two.
J. T. Wasson, G. W. Kallemeyn
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Abstract A compilation of data on 78 elements in the nine groups of chondrites shows each to be isochemical with the exception of a few volatiles. With the exception of the most volatile elements, the groups have solar abundances to within a factor of two.
J. T. Wasson, G. W. Kallemeyn
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