Results 141 to 150 of about 517 (188)

Actinide abundances in ordinary chondrites

Geochimica et Cosmochimica Acta, 1990
Measurements of ^(244)Pu fission Xe, U, Th, and light REE (LREE) abundances, along with modal petrographic determinations of phosphate abundances, were carried out on equilibrated ordinary chondrites in order to define better the solar system Pu abundance and to determine the degree of variation of actinide and LREE abundances.
Hagee, B., Bernatowicz, T. J., Podosek, F. A., Johnson, M. L., Burnett, D. S., Tatsumoto, M.   +5 more
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Physical properties of ordinary chondrites

Journal of Geophysical Research: Solid Earth, 1983
Physical properties (intrinsic and bulk densities, porosity, compressional and shear wave velocities, thermal diffusivity, and conductivity) are measured on 11 ordinary chondrites, one carbonaceous chondrite, and two achondritic clasts of a mesosiderite.
Kiyoshi Yomogida, Takafumi Matsui
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Paleomagnetic systematics of ordinary chondrites

Earth and Planetary Science Letters, 1975
The investigation shows that the decrease in intensity and the increase in stability of natural remanent magnetization (NRM) to alternating field (AF) demagnetization roughly parallel the decrease in Ni-Fe metal content and the corresponding enrichment of the metal phases in Ni.
Aviva Brecher, Rambabu P. Ranganayaki
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VUGS IN ORDINARY CHONDRITES

Meteoritics, 1981
Large vugs occur in the ordinary chondrite, Farmington. They contain the same phases present in the body of the meteorite, either as vug wall lining or as crystals attached to linings. The morphologies of these phases indicate a history of melting and vapor deposition.
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Thermoluminescence Study of Ordinary Chondrites

AIP Conference Proceedings, 2009
The mineral responsible for thermoluminescence (TL) in ordinary chondrites is mainly feldspar. Thermal metamorphism transferred feldspathic glass to feldspar. Then induced TL is useful tool for subtype classification in type 3 ordinary chondrites. Natural TL is also useful for identifying potentially paired fragments.
K. Ninagawa, Arnold Gucsik
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ASTEROIDAL SOURCE OF ORDINARY CHONDRITES*

Meteoritics, 1985
The orbital evolution of asteroidal fragments with diameters ranging from 10 cm to 20 km, injected into the 3:1 Kirkwood gap at 2.50 A.U., has been investigated using Monte Carlo techniques. It is assumed that this material can become Earth‐crossing on a time scale of 106 years, as a result of a chaotic zone discovered by Wisdom, associated with the 3 ...
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Multiple parent bodies of ordinary chondrites

Earth and Planetary Science Letters, 1984
Thermal histories of chondrite parent bodies are calculated from an initial state with material in a powder-like form, taking into account the effect of consolidation state on thermal conductivity. The very low thermal conductivity of the starting materials makes it possible for a small body with a radius of less than 100 km to be heated by several ...
Kiyoshi Yomogida, Takafumi Matsui
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Glass‐rich chondrules in ordinary chondrites

Meteoritics, 1994
Abstract There are two types of glass‐rich chondrules in unequilibrated ordinary chondrites (OC): (1) porphyritic chondrules containing 55–85 vol% glass or microcrystalline mesostasis and (2) nonporphyritic chondrules, containing 90–99 vol% glass. These two types are similar in mineralogy and bulk composition to previously described Al‐rich chondrules ...
Alexander N. Krot, Alan E. Rubin
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Presolar components in the ordinary chondrites

Earth and Planetary Science Letters, 1990
Abstract As part of the search for presolar material in primitive meteorites eleven ordinary chondrites, ranging from petrologic type 3 to 6, have been analysed for C and N isotopes by stepped combustion. Isotopically anomalous components have been found only in those meteorites of petrologic type 3.6 or below.
C.M.O'D. Alexander, J.W. Arden, R.D. Ash, C.T. Pillinger   +3 more
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Moderately volatile siderophiles in ordinary chondrites

Earth and Planetary Science Letters, 1979
Abstract The contents of the moderately volatile elements Ga, Ge, Cu and Sb in ordinary chondrites give us some clues with regard to the metal-silicate fractionation process. Their concentration in coexisting magnetic and non-magnetic portions of members of each ordinary chondrite group will be discussed. Germanium and Sb are mostly siderophilic, but
Ermanno R. Rambaldi, Miguel Cendales
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