Results 71 to 80 of about 424,190 (218)

Spectral Reflectance Properties (0.3–2.5 μm) of LL Ordinary Chondrites

The Astrophysical Journal Supplement Series
Spectral characterization of asteroids relies on meteorite spectral calibration to constrain their surface mineralogy. We have conducted a comprehensive spectroscopic study of LL chondrites to shed light on the factors that control their reflectance ...
Pengyue Wang, Edward Cloutis, Xian Shi, Daniel Applin, Ye Su, Man-to Hui   +5 more
doaj   +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

Deep Crustal Magma‐Water Interaction During Oceanic Core Complex Termination of the Godzilla Megamullion in the Parece Vela Basin

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 9, September 2026.
Abstract Oceanic Core Complexes (OCCs) in back‐arc basins are not as thoroughly investigated, and their termination processes remain poorly understood. The Godzilla Megamullion is the largest known ceased OCC on Earth, yet magmatic and hydrothermal records from its termination are lacking.
Han‐Tao Chi, Guo‐Liang Zhang, Ji Zhang, Chang‐Ming Lu   +3 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

Thermoluminescence characteristics and chemical compositions of mesostases in ordinary chondrites [PDF]

, 1991
P(論文)Induced thermoluminescence (TL) images of ordinary chondrites, ALH-77214 (L3.4-3.5), Y-74191 (L3.6), ALH-77216 (L3.8) and ALH-78043 (L6), were measured by the TL spatial distribution readout system combined with a microscope and TL characteristics ...
Fujimura,Shin-ichi, Wada,Tomonori, Yamamoto, Isao, Matsunami,Satoshi, Ninagawa,Kiyotaka, Kubo,Hideyuki, Nishimura,Hiroshi   +6 more
core   +1 more source

Fe-Ni metal in primitive chondrites: Indicators of classification and metamorphic conditions for ordinary and CO chondrites

, 2008
We report the results of our petrological and mineralogical study of Fe-Ni metal in type 3 ordinary and CO chondrites, and the ungrouped carbonaceous chondrite Acfer 094.
Grossman, J. N., Kimura, M., Weisberg, M. K.   +2 more
core   +2 more sources

Petrogenesis and Tectonic Implication of the Newly Identified Rhyacian and Orosirian Orthogneisses in the Northwestern Part of the Gyeonggi Massif (Soyeonpyeongdo and Ganghwado Areas), South Korea: Constrained From Whole‐Rock Geochemistry and Zircon U‐Pb‐Hf Isotopic Compositions

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 9, September 2026.
Abstract The Gyeonggi Massif is one of the major Precambrian basements in the Korean Peninsula where Paleoproterozoic orthogneiss and paragneiss were widely exposed. In this study, newly identified Rhyacian to Orosirian meta‐igneous rocks from the northwestern Gyeonggi Massif (Soyeonpyeongdo and Ganghwado areas) were investigated to elucidate their ...
Seung Hwan Lee, Deung‐Lyong Cho, Jeong‐Yeong Park, Sung Won Kim, Byung Choon Lee, Mingguo Zhai   +5 more
wiley   +1 more source

Building the Andean Crust at ∼35°S: Arc Geochemistry Reveals Cretaceous Thinning and Rapid Neogene Thickening

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 9, September 2026.
Abstract Quantification of the timing and mechanisms of crustal thickening in Cordilleran orogenic hinterlands remains challenging. We address this in the Andes using whole‐rock geochemistry and zircon petrochronology from a >70 Myr volcanic record in the Tinguiririca valley of Chile (∼35° ${}^{\circ}$S), which captures a pivotal transition from ...
Chance B. Ronemus, Caden J. Howlett, Peter G. DeCelles, Barbara Carrapa, Andrés Echaurren, Matías Barrionuevo, Jesse G. Mosolf, Michelle L. Foley, Mihai N. Ducea   +8 more
wiley   +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

New constraints from ²⁶Al-²⁶Mg chronology of anorthite bearing chondrules in unequilibrated ordinary chondrites. [PDF]

Geochim Cosmochim Acta, 2021
Siron G, Fukuda K, Kimura M, Kita NT.
europepmc   +1 more source