Results 51 to 60 of about 37,639 (216)

Fine-Scale Variations in Eucritic Pyroxene FeO/MnO: Process vs. Provenance. [PDF]

, 2018
Most asteroidal igneous rocks are eucrite-like basalts and gabbros, composed mostly of ferroan low- and high-Ca pyroxenes and calcic plagioclase, plus smaller amounts of silica (most commonly tridymite), ilmenite, chromite, troilite, Ca-phosphate, metal ...
Barrett, T. J., Berger, E. L., Le, L, Mittlefehldt, D. W., Peng, Z. X., Ross, D. K   +5 more
core  

Phase transitions in spin-orbital coupled model for pyroxene titanium oxides

, 2004
We study the competing phases and the phase transition phenomena in an effective spin-orbital coupled model derived for pyroxene titanium oxides ATiSi2O6 (A=Na, Li).
Betsuyaku H., Betsuyaku H., Hikihara T., Imada M., Inagaki S., Isobe M., Kugel K. I., Ninomiya E., Roth L. M., Tokura Y.   +9 more
core   +1 more source

High pressure minerals in the Château-Renard (L6) ordinary chondrite: implications for collisions on its parent body [PDF]

, 2018
We report the first discoveries of high-pressure minerals in the historical L6 chondrite fall Château-Renard, based on co-located Raman spectroscopy, scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy and electron backscatter ...
Anand, Mahesh, Asimow, Paul D., Baziotis, Ioannis, Cernok, Ana, Ferrière, Ludovic, Hu, Jinping, Ma, Chi, Topa, Dan   +7 more
core   +2 more sources

Deglaciation of the Burren glacio‐karst, western Ireland, during Termination 1: Implications for North Atlantic climate and karstification

Journal of Quaternary Science, EarlyView.
Abstract The Burren uplands in western Ireland form one of the most extensive and best‐preserved examples of glacio‐karst in Europe. Subsumed by the Irish ice sheet during the Late Pleistocene, granite erratic boulders and in situ silica veins in the limestone bedrock provide a rare opportunity to reconstruct the timing and rate of deglaciation ...
Gordon Bromley, Colin Bunce, Brenda Hall, Aaron Putnam, Frank McDermott   +4 more
wiley   +1 more source

Estudio y caracterización de vidriados vitrocerámicos basados en piroxeno

Boletín de la Sociedad Española de Cerámica y Vidrio, 2004
A method was proposed to develop pyroxene-based glass-ceramic glazes. First, was studied, by X-ray diffraction and scanning electron microscopy, the effect of several additives in the monophasic crystallization of pyroxene from glasses in the CaO•MgO ...
Lucas, F., Belda, A., Torres, F. J., Alarcón, J.   +3 more
doaj  

Evolution of oxygen isotopic composition in the inner solar nebula

, 2005
Changes in the chemical and isotopic composition of the solar nebula with time are reflected in the properties of different constituents that are preserved in chondritic meteorites. CR carbonaceous chondrites are among the most primitive of all chondrite
Aleon J., Alexander N. Krot, Cassen P., Catanzaro E., Desch S. J., Edward R. D. Scott, Guy Libourel, Hisayoshi Yurimoto, Ian D. Hutcheon, Jeffrey N. Cuzzi, Jerome Aleon, Kevin D. McKeegan, Klerner S., Kobayashi S., Krot A. N., Krot A. N., Krot A. N., Krot A. N., Krot A. N., Krot A. N., Lee T., MacPherson G. J., Marc Chaussidon, Marhas K. K., Marhas K. K., McKeegan K. D., McKeegan K. D., Michael I. Petaev, Scott E. R. D., Weidenschilling S. J., Woolum D. S.   +30 more
core   +1 more source

Thermochemical stability of low-iron, manganese-enriched olivine in astrophysical environments [PDF]

, 2012
Low-iron, manganese-enriched (LIME) olivine grains are found in cometary samples returned by the Stardust mission from comet 81P/Wild 2. Similar grains are found in primitive meteoritic clasts and unequilibrated meteorite matrix.
Beckett, John R., Ebel, Denton S., Weisberg, Michael K.   +2 more
core   +1 more source

Mikrometeorite und ihr Ursprung im Sonnensystem: Außerirdischer Staub zum Anfassen

Physik in unserer Zeit, EarlyView.
Mit einer Größe, die der Dicke eines Haares entspricht, sind Mikrometeorite kaum sichtbar für das bloße Auge. Dennoch werden sie seit etwa 150 Jahren gesammelt, und seit wenigen Jahren sogar auf unseren Hausdächern. Als Kostproben von Asteroiden oder Kometen stellen sie wertvolle Boten unseres Sonnensystems dar.
Jenny Feige
wiley   +1 more source

Near‐infrared Spectra of Lunar Ferrous Mineral Mixtures

Earth and Space Science, 2021
Iron‐bearing minerals are a major component of materials on the lunar surface, and many of them can be distinguished based on the diagnostic absorption features in visible and near‐infrared reflectance spectra.
Xunyu Zhang, Edward Cloutis
doaj   +1 more source

Modeling the Thermal Properties of Hydrogen‐Based Direct Reduced Iron Using Computational Thermodynamics and Machine Learning

steel research international, EarlyView.
Hydrogen‐based direct reduced iron (H‐DRI) melts differently from scrap and carbon‐bearing DRI. This work combines differential scanning calorimetry experiments, FactSage thermodynamics, and simple composition‐based regression to predict solidus, liquidus, heat capacity, and enthalpy for H‐DRI.
Ankur Agnihotri, Petri Sulasalmi, Pasquale Cavaliere, Ville‐Valtteri Visuri   +3 more
wiley   +1 more source