Results 61 to 70 of about 6,413 (223)

Substitution of Fe3+ into anorthite in oxidized, Al‐deficient ferrobasaltic systems with implications for the petrogenesis of angrite meteorites

Meteoritics &Planetary Science, EarlyView.
Abstract Angrite meteorites are critically silica‐undersaturated igneous rocks with high Ca/Al and Fe/Mg, along with depletion in volatile lithophile elements Na and K such that they crystallize anorthite along with olivine and calcic pyroxene. The anorthite in angrites contains substantial Fe, and in NWA 1670 and NWA 1296, it is present at major ...
Seann J. McKibbin, Dominique Tanner, Hugh St. C. O'Neill   +2 more
wiley   +1 more source

Homogeneous distribution of Fe isotopes in the early solar nebula [PDF]

, 2013
International audienceTo examine the iron (Fe) isotopic heterogeneities of CI and ordinary chondrites, we have analyzed several large chips (approximately 1 g) from three CI chondrites and three ordinary chondrites (LL5, L5, and H5).
Barrat, Jean-Alix,, Moynier, Frédéric, Paniello, Randal C., Savage, Paul S., Wang, Kun, Zanda, Brigitte   +5 more
core   +3 more sources

Near‐Synchronous Cambrian Evolution of the Transbrasiliano‐Kandi‐4°50′ Shear Zone in South America and Africa

Terra Nova, EarlyView.
ABSTRACT The Transbrasiliano‐Kandi‐4°50′ (TK4) shear zone in western Gondwana crosscuts South America and NW Africa for at least 6000 km. Despite its impressive size, the timing of the main episode of dextral ductile shearing is uncertain. We present detailed in situ multi‐mineral geochronology of mylonites from both Brazil and Algeria supporting that ...
F. A. Caxito, B. V. Ribeiro, F. Alkmim, A. Deramchi, C. L. Kirkland   +4 more
wiley   +1 more source

Thermal Alteration of Labile Elements in Carbonaceous Chondrites

, 2018
Carbonaceous chondrite meteorites are some of the oldest Solar System planetary materials available for study. The CI group has bulk abundances of elements similar to those of the solar photosphere.
Andronikov, Alexandre, Blum, Joel D., Goreva, Yulia S., Klaue, Bjoern, Lauretta, Dante S., Springmann, Alessondra, Steckloff, Jordan K.   +6 more
core   +1 more source

Selective Disparity of Ordinary Chondritic Precursors in Micrometeorite Flux [PDF]

, 2018
All known extraterrestrial dust (micrometeoroids) entering the Earth's atmosphere is anticipated to have a significant contribution from ordinary chondritic precursors, as seen in meteorites, but this is an apparent contradiction that needs to be ...
A. K. Naik, Britt D. T., Brownlee D. E. ed Peucker-Ehrenbrink B., D. Fernandes, Flynn G. J., Flynn G. J., J. D. Carrillo-Sánchez, J. M. C. Plane, Lodders K., M. Shyam Prasad, N. G. Rudraswami, Nesvorný D., Nesvorný D., Rietmeijer F. J. M. ed Papike J. J., Rudraswami N. G., Rudraswami N. G., Rudraswami N. G., S. Taylor, W. Feng, Yada T.   +19 more
core   +1 more source

Spectral Effects of Shock Darkening on Ordinary Chondrite and Howardite, Eucrite, and Diogenite Meteorites

The Planetary Science Journal
Impacts are the most ubiquitous processes on planetary bodies in our solar system. During these impact events, shock waves can deposit enough energy to produce shock-induced darkening in the target material, resulting in an alteration of its spectral ...
Juan A. Sanchez, Vishnu Reddy, Lucille Le Corre, Neil Pearson, Adam Battle   +4 more
doaj   +1 more source

Thermal evolution and sintering of chondritic planetesimals III. Modelling the heat conductivity of porous chondrite material

, 2014
The construction of models for the internal constitution and the temporal evolution of large planetesimals, the parent bodies of chondrites, requires information on the heat conductivity of the complex mixture of minerals and iron metal found in ...
Akridge, Akridge, Arzt, Beitz, Bennett, Bruggeman, Cloutis, Cloutis, Cloutis, Cloutis, Consolmagno, Elkins-Tanton, Emery, Fei, Fiske, Friedrich, Friedrich, Friedrich, Friedrich, Gail, Hans-Peter Gail, Harrison, Henke, Henke, Henke, Ho, Hofmeister, Hofmeister, Horai, Horai, Housen, Jaeger, Jarosewich, Krause, Mario Trieloff, Opeil, Opeil, Rubin, Sasso, Stephan Henke, van Schmus, Vernazza, Ward, Warren, Wozniakiewicz, Wozniakiewicz, Xu, Yomogida, Yomogida   +48 more
core   +2 more sources

Quantitative FT-IR Analysis for Chondritic Meteorites: Search for C_60 in Meteorites [PDF]

Journal of Astronomy and Space Sciences, 1998
Infrared absorption spectra of 9 bulk samples and 3 acid residues of meteorites were obtained in the mid-infrared region (4000 ~ 400 cm^(-1)). From the known composition of meteorites studied, the possible absorption modes were investigated.
Chunglee Kim, Jongmann Yang
doaj  

Transmission electron microscopy of an interplanetary dust particle with links to CI chondrites [PDF]

The majority of hydrated interplanetary dust particles (IDPs) have compositions that resemble CI and CM chondrites, however, their mineralogies are most similar to the fine grained material in certain altered type-3 carbonaceous and ordinary chondrites ...
Keller, Lindsay P., Mckay, David S., Thomas, Kathie L.   +2 more
core   +1 more source

Antarctic meteorite descriptions, 1980 [PDF]

Specimens found in the Alan Hills area include 361 ordinary chondrites, 4 carbonaceous chondrites, 6 achondrites, and 2 irons. Thirteen specimens measured over 11 cm in diameter and 69 between 5 to 10 cm in diameter are reported.
Bogard, D. D., Mason, B., Schwarz, C. M., Score, R.   +3 more
core   +1 more source