Results 61 to 70 of about 64,440 (194)
Journal of Metamorphic Geology, EarlyView.ABSTRACT Elevated heat flow associated with mafic magmatism in accretionary orogens has often been proposed as a driving mechanism for (ultra)high‐temperature (UHT) metamorphism and anatexis. The Sancheong–Hadong complex, located in the southern Yeongnam Massif, Korea, consists of a ca.
Yuyoung Lee +3 more
wiley +1 more source
Study of the Extraterrestrial Materials at Antarctica, III : On the Yamato Meteorites
Antarctic Record, 1973 Antarctica is thought to be the most suitable place for searching extraterrestrial materials. Since 1965, we have been studying microtektite and cosmic dust in Antarctica.
Masako SHIMA +2 more
doaj +1 more source
Meteoritics &Planetary Science, EarlyView.Abstract Silica polymorphs in meteorites provide critical constraints on crystallization processes associated with thermal activity in the early solar system. A detailed investigation of silica polymorphs in eucrites (the largest group of achondrites) using cathodoluminescence imaging and laser‐Raman spectroscopy revealed significant variations in the ...
Rei Kanemaru +14 more
wiley +1 more source
Geochemistry of the Cretaceous-Tertiary transition boundary at Blake Nose (N.W. Atlantic): Cosmogenic Ni [PDF]
Journal of the Serbian Chemical Society, 2004 The Cretaceous-Tertiary (KT) boundary transition at the Blake Nose Plateau recovered by ODP Leg 171B (site 1049, hole A, core 17X, section 2) contains an ejecta bed (thickness ca. 17 cm) marking a late Cretaceous asteroid impact.
KATJA I. PANOV +3 more
doaj +3 more sources
Mineralogical Characterization of Baptistina Asteroid Family: Implications for K/T Impactor Source
, 2011 Bottke et al. (2007) linked the catastrophic formation of Baptistina Asteroid Family (BAF) to the K/T impact event. This linkage was based on dynamical and compositional evidence, which suggested the impactor had a composition similar to CM2 carbonaceous
Candal, Alvaro Alvarez +10 more
core +1 more source
D/H ratios of the inner Solar System [PDF]
, 2017 The original hydrogen isotope (D/H) ratios of different planetary bodies may indicate where each body formed in the Solar System. However, geological and atmospheric processes can alter these ratios through time.
Hallis, Lydia
core +1 more source
Investigation and reclassification of four mesosiderites—Implications for their formation
Meteoritics &Planetary Science, EarlyView.Abstract Mesosiderites are rare, differentiated meteorites, so‐called stony‐iron meteorites—they are impact breccias composed of an unusual mix of crustal basalt and pyroxenite, core‐derived metal, but no mantle materials. This odd mixture makes their origin enigmatic and has inspired many different formation theories over the last several decades ...
Gabriel Zachén +4 more
wiley +1 more source
Nature's Starships II: Simulating the Synthesis of Amino Acids in Meteorite Parent Bodies
, 2015 Carbonaceous chondrite meteorites are known for having high water and organic material contents, including amino acids. Here we address the origin of amino acids in the warm interiors of their parent bodies (planetesimals) within a few million years of ...
Cobb, Alyssa K. +2 more
core +1 more source
Petrography of phosphates in CI and CY carbonaceous chondrites
Meteoritics &Planetary Science, EarlyView.Abstract Phosphate minerals are significant carriers of volatiles (e.g., OH) and halogens in chondritic material; however, their origin in most groups of carbonaceous chondrites remains poorly characterized. We have determined the abundance, morphology, texture, and composition of phosphate grains in aqueously altered CI chondrites and in hydrated and ...
C. S. Harrison +3 more
wiley +1 more source
Origin of 182W Anomalies in Ocean Island Basalts
Geochemistry, Geophysics, Geosystems, 2023 Ocean island basalts (OIB) show variable 182W deficits that have been attributed to either early differentiation of the mantle or core‐mantle interaction.
Gregory J. Archer +5 more
doaj +1 more source