Results 191 to 200 of about 6,436 (237)

Impact sculpting of the early martian atmosphere. [PDF]

Sci Adv
Shorttle O, Saeidfirozeh H, Rimmer PB, Laitl V, Kubelík P, Petera L, Ferus M.   +6 more
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RETRACTED: A 12,800-year-old layer with cometary dust, microspherules, and platinum anomaly recorded in multiple cores from Baffin Bay.

PLoS One
Moore CR, Tselmovich VA, LeCompte MA, West A, Culver SJ, Mallinson DJ, Baalousha M, Kennett JP, Napier WM, Bizimis M, Adedeji V, Sutton SR, Kletetschka G, Langworthy KA, Perez JP, Witwer T, Young MD, Alam M, Jeffreys J, Greenwood RC, Malley JA.   +20 more
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Tungsten in ordinary chondrites

Earth and Planetary Science Letters, 1977
Abstract In ordinary chondrites tungsten displays both lithophile and siderophile characteristics. Its concentration in the metal phase is positively correlated with petrologic type, and with the distribution coefficientKD =W in metal/W in silicates plus troilite.
Ermanno R. Rambaldi, Miguel Cendales
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Incompletely compacted equilibrated ordinary chondrites

Meteoritics & Planetary Science, 2009
Abstract— We document the size distributions and locations of voids present within five highly porous equilibrated ordinary chondrites using high‐resolution synchrotron X‐ray microtomography (μCT) and helium pycnometry. We found total porosities ranging from ∼10 to 20% within these chondrites, and with μCT we show that up to 64% of the void space is ...
Matthew R. Sasso, Robert J. Macke, Joseph S. Boesenberg, Daniel T. Britt, Mark L. Rivers, Denton S. Ebel, Jon M. Friedrich   +6 more
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Trapped xenon in ordinary chondrites

Journal of Geophysical Research: Planets, 1992
A trapped component of heavy noble gases representing a distinct solar system (presumably asteroid belt) reservoir is known to be concentrated in carbonaceous carriers of chondritic meteorites. The isotopic signature of trapped Xe in separates of the H4 chondrite Forest Vale (FV) was determined by combusting its carrier phases at 600°C in oxygen ...
Lavielle, B., Marti, K.
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Chainpur-like Chondrites: Primitive Precursors of Ordinary Chondrites?

Science, 1966
Chainpur and similar, apparently primitive, chondritic meteorites may be precursors of ordinary chondrites; a variety of evidence supports this working hypothesis. In general, carbonaceous chondrites seem to be related collaterally to this genetic sequence rather than being direct ancestors of ordinary chondrites.
R A, Schmitt, R H, Smith, G G, Goles
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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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Formation of ordinary chondrites

Reviews of Geophysics, 1972
Most of the chemical and mineralogical properties of the ordinary chondrites were established by processes that occurred in the solar nebula during a short time span near the time of formation of the solar system. Four separate and distinct fractionation events appear to have been involved in their formation from more primitive material of mean solar ...
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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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