Results 111 to 120 of about 10,401 (241)

Crystallization history of gabbroic shergottite NWA 6963 as revealed by pyroxene zoning [PDF]

, 2017
NorthWest Africa (NWA) 6963 is an intriguing new coarse grained Martian meteorite that further extends our sample collection both compositionally and texturally. It was originally documented as a basaltic shergottite because the pyroxene compositions and
Hammond, S. J., Schwenzer, S. P., Meado, A. L., Filiberto, J.   +3 more
core  

Oxygen isotopes in the early protoplanetary disk inferred from pyroxene in a classical type B CAI

, 2016
International audienceA major unanswered question in solar system formation is the origin of the oxygen isotopic dichotomy between the Sun and the planets.
Aléon, Jérôme
core   +1 more source

Low temperatures and high water/rock ratios in asteroid (101955) Bennu's history based on X‐ray powder diffraction of returned samples

Meteoritics &Planetary Science, Volume 61, Issue 6, Page 1077-1094, June 2026.
Abstract Samples returned by NASA's OSIRIS‐REx mission from the carbonaceous asteroid (101955) Bennu hold clues about conditions in the early solar system and the formation of planetary bodies. Initial investigation of Bennu samples found that they are rich in phyllosilicates and other secondary minerals formed during aqueous alteration of a larger ...
A. J. King, P. F. Schofield, J. Najorka, H. C. Bates, S. S. Russell, T. J. McCoy, T. J. Zega, H. C. Connolly Jr, D. S. Lauretta   +8 more
wiley   +1 more source

INTERRELATIONS BETWEEN MINERAL BODIES IN FENITE HALO OF THE WESTERN CONTACT OF THE ILMENOGORSKY MIASKITE COMPLEX [PDF]

Минералогия, 2017
The northwestern contact of the Ilmenogorsky miaskite complex exhibits a succession of rocks from early banded meso- and melanocratic syenites to granosyenites and granites and further complex series of leucocratic syenites, carbonatites, syenitic and ...
V.A. Popov, V.A. Muftakhov
doaj  

The iron isotope composition of pyroxene from the Skaergaard layered mafic intrusion , East Greenland

, 2018
Iron isotopes show small fractionations in igneous rocks emplaced at high temperature , but the processes by which these fractionations originate are still debated.
NC DOCKS at East Carolina University, Pertunen, Brett Anthony   +1 more
core  

Potential of VIS‐IR imaging spectroscopy and SEM‐EDS and EMPA to map the mineralogical composition of NWA 7317 (CR6)

Meteoritics &Planetary Science, Volume 61, Issue 6, Page 1026-1044, June 2026.
Abstract Asteroid compositional analysis relies on comparing reflectance spectra with laboratory data from well‐characterized meteorites. To advance this comparison, we performed a comprehensive laboratory analysis on a slab of the Northwest Africa (NWA) 7317—CR6 carbonaceous chondrite.
Simone Pascucci, Tiberio Cuppone, Martina Casalini, Simone De Angelis, Antonio Lettino, Angelo Palombo, Eliana La Francesca, Gianrico Filacchione, Maria Cristina De Sanctis, Anna Galiano, Giovanni Pratesi   +10 more
wiley   +1 more source

The Fate of Iron Formations in the Deep Mantle: Constraints From Iron Oxide Reduction Kinetics Experiments

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract Dense sedimentary iron formations (IFs) subducted into the mantle during Earth's early history, may have descended to the core‐mantle boundary where they could exert strong control on its thermal and seismological properties. A key unanswered question is the extent to which IFs retain their oxidized character in the much more reducing mantle ...
Jemila A. Edmond, Scott J. Maurer, James A. Van Orman   +2 more
wiley   +1 more source

Valence State Partitioning of V between Pyroxene and Melt for Martian Melt Compositions Y 980459 and QUE 94201: The Effect of Pyroxene Composition and Crystal Structure

, 2014
A spiked (with REE, V, Sc) martian basalt Y980459 composition was used to synthesize olivine, spinel, and pyroxene at 1200 C at 5 oxygen fugacities: IW-1, IW, IW+1, IW+2, and QFM. The high spike levels for REE were used for two specific reasons.
Bell, A. S., Jones, J., Le, Loan, Shearer, C. K., Burger, P. V., Papike, J. J.   +5 more
core  

Pyroxene standards for SIMS oxygen isotope analysis and their application to Merapi volcano, Sunda arc, Indonesia

, 2016
Measurement of oxygen isotope ratios in common silicate minerals such as olivine, pyroxene, feldspar, garnet, and quartz is increasingly performed by Secondary Ion Mass Spectrometry (SIMS).
Whitehouse, Martin J.,, Troll, V.R., Deegan, F.M., Harris, C., Budd, D.A., Geiger, H., Hålenius, U.,   +6 more
core   +1 more source

Petrology of the 1952 Eruption and Ancient Lava and Pyroclastic Flows of Krenitsyn Peak Volcano, Onekotan Island, Kuril Arc, Russia

Geosciences
Krenitsyn Peak is one of the two active volcanoes on Onekotan Island (Greater Kuril Ridge). The inaccessibility of the island, along with the volcano being situated within a sizeable (7 km in diameter) and cold (3.7 °C) caldera lake, has led to minimal ...
Vesta O. Davydova, Anton A. Nuzhdaev, Ilya E. Bolshakov, Ruslan A. Kuznetsov, Andrey B. Ermolinskiy, Elena S. Zhitova, Vasiliy O. Yapaskurt   +6 more
doaj   +1 more source