Results 51 to 60 of about 40,246 (197)

Parsa enstatite chondrite: a mineralogic and textural analysis [PDF]

, 2014
The mineralogy and petrology of Parsa, an EH4 enstatite chondrite (Bhandari et al., 1980), was analyzed with an emphasis on the rare mineral roedderite [(Na,K)2(Mg,Fe)5Si12O30)] using a scanning electron microscope, a JEOL Hyperprobe, and a Raman ...
Horne, Audrey
core   +1 more source

Underestimation of Planetary Contraction Due To Obscuration by Surface Roughness: The Case of Mercury

Geophysical Research Letters, Volume 53, Issue 17, 16 September 2026.
Abstract Estimating Mercury's radial contraction is key to understanding the planet's geodynamic evolution. Contraction has been inferred from mapped shortening structures, whose heterogeneous distribution contradicts the isotropic contraction expected from global cooling.
G. Nishiyama, A. Broquet, N. Tosi, F. Preusker, A. Stark, H. Hussmann, E. Hauber   +6 more
wiley   +1 more source

The Density of Liquid FeO and the Oxygen Contents of the Cores of Earth and Mars

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 9, September 2026.
Abstract Oxygen is a possible light element in the cores of Earth and Mars. Its effect on the density and elastic properties of liquid iron is, therefore, important for estimating its abundance in planetary cores, from which conditions of core‐mantle equilibration could be constrained.
Daniel J. Frost, Lianjie Man, Rémy Pierru, Laura Henry, Adrien Néri   +4 more
wiley   +1 more source

Multi‐Stage Evolution of Subducted Oceanic Mantle: The Marlborough Ultramafic Suite (New England Orogen, Australia)

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 9, September 2026.
Abstract Oceanic lithosphere is continuously destroyed by subduction, challenging our ability to develop tectonic reconstructions. One way to tackle this problem is to examine relics of once‐consumed oceanic domains preserved along convergent margins. In the New England Orogen (eastern Australia), disrupted exposures of ultramafic rocks loosely define ...
J. A. Pasco, G. Rosenbaum, T. Ubide, L. A. Milan, C. Spier   +4 more
wiley   +1 more source

Lithium- and oxygen-isotope compositions of a Si-rich nebular reservoir determined from chondrule constituents in the Sahara 97103 EH3 chondrite [PDF]

Here we report the in situ ion-microprobe analyses of the Li- and O-isotope compositions of enstatite, FeO-rich pyroxene, olivine, glass, and cristobalite grains from six chondrule-related objects from the Sahara 97103 EH3 chondrite.
Tanaka, Ryoji, Ota, Tsutomu, Douglas-Song, Torii, Kitagawa, Hiroshi, Potiszil, Christian, Kunihiro, Tak, Yamanaka, Masahiro   +6 more
core   +1 more source

(Ultra)high‐Pressure Metamorphism in Sedimentary Versus Basaltic Rocks: Insights From a Variscan Mélange in the South Carpathians

Journal of Metamorphic Geology, Volume 44, Issue 8, Page 585-610, September 2026.
ABSTRACT Reconstructing the pressure–temperature–time (P–T–t) evolution of (ultra)high‐pressure rocks is essential for constraining subduction and collisional dynamics. Subduction zones are often investigated using basic eclogites, whereas nonbasic high‐pressure rocks remain comparatively understudied, potentially hindering a comprehensive ...
Otavio S. G. Silva, Bruno V. Ribeiro, Gavril Săbău, Fabricio Caxito, Paulo A. de Paiva‐Silva, Pierre Lanari, George Luvizotto, Mahyra Tedeschi   +7 more
wiley   +1 more source

129Xe-128Xe and 40Ar-39Ar chronology of two Antarctic enstatite meteorites [PDF]

, 1983
P(論文)^(Xe)-^(Xe) and ^(Ar)-^(Ar) analyses have been performed on two Antarctic enstatite meteorites, the chondrite Y-691 and the aubrite (enstatite achondrite) ALH-78113.
Podosek, Frank A., Bernatowicz, Thomas J., Honda, Masahiko   +2 more
core   +1 more source

Bolide light curve systematics from 75 recovered meteorites

Meteoritics &Planetary Science, Volume 61, Issue 9, Page 2351-2392, September 2026.
Abstract How does the energy deposition profile (light curve), deceleration, and penetration depth in Earth's atmosphere depend on asteroid composition and meteorite type? Here, we present the light curve and velocity profile of 75 bolides from camera‐documented meteorite falls.
Peter Jenniskens, Stuart Pilorz, Darrel Robertson, Eric C. Stern   +3 more
wiley   +1 more source

Nature, origin, and phosphorylation potential of the phosphorus/sulfur‐bearing nanoscale multiphasic assemblages in the CM chondrites Murchison and Murray

Meteoritics &Planetary Science, Volume 61, Issue 9, Page 2303-2335, September 2026.
Abstract Carbonaceous chondrites contain phosphorus, whose speciation and thus history remain to be investigated. Phosphorus/sulfur‐bearing assemblages have been reported in carbonaceous CM chondrites, but there is no consensus about their exact compositions and origins.
Valentine Megevand, Sylvain Bernard, Corentin Le Guillou, Roberto Conconi, François Guyot   +4 more
wiley   +1 more source

Petrochemical study of the Yamato-691 enstatite chondrite (EH3) II: Descriptions and mineral compositions of unusual silicate-inclusions [PDF]

, 1988
P(論文)The Yamato (Y)-691 chondrite includes unusual silicate-inclusions besides chondrules. An inclusion containing high CaO and Al_2O_3 contents and other opaque massive inclusions containing high FeO content are similar in bulk chemical compositions to ...
Ikeda, Yukio
core   +1 more source