Results 71 to 80 of about 48,492 (250)
Small‐scale elemental abundance variations in Ryugu particles from touchdown 1
Meteoritics &Planetary Science, EarlyView.Abstract Ryugu materials closely resemble CI chondrites' mineralogical, chemical, and isotopic compositions; yet minor but resolvable differences in certain elemental abundances are evident. In this study, the bulk chemical compositions of eight individual Ryugu particles (1.5–4.3 mg) from the first touchdown site (TD1) were determined using triple ...
Karina López García +6 more
wiley +1 more source
Uranium, rare metals, and granulite-facies metamorphism
, 2014 During granulite-facies metamorphism of metasedimentary rocks by the infiltration of carbonic fluids, the disappearance of hydrated minerals leads to the liberation of aqueous fluids.
M. Cuney, P. Barbey
semanticscholar +1 more source
Meteoritics &Planetary Science, EarlyView.Abstract The Tvären structure in southeastern Sweden has been listed as a confirmed marine‐target impact structure for decades. However, to date, no measurements and/or indexed data of planar deformation features in quartz grains from the structure have been published or any other unequivocal evidence of impact.
Katarzyna J. Gajewska +6 more
wiley +1 more source
Olivine-chrome-spinel equilibrium in chromitites and ultramafites of Rai-Iz massif, Polar Urals
Литосфера, 2016 Olivine and chrome-spinel compositions from chromitites and ore-bearing metamorphosed ultramafic rocks of Rai-Iz massif were compared. It was established that olivine and spinel ferruginosity are directly proportional and increase monotonically from ...
P. B. Shirjaev, N. V. Vakhrusheva
doaj +2 more sources
Geochemistry, Geophysics, GeosystemsMeasurements of surface heat flux from boreholes of the NIED Hi‐net network of seismometers are used to determine temperature and shear stress on the plate interface beneath northern Honshu.
Philip England +2 more
doaj +1 more source
Литосфера, 2016 For the first time detailed mineralogical research of the Permo-Triassic basalt core samples of Yen-Yakhinskaya superdeep hole SG-7 from the depths of 7673 m, 8009 m and 8250 m was carried. The composition of minerals investigated.
S. V. Berzin +2 more
doaj
Radiation characteristics of coals at different stages of metamorphism
Записки Горного институтаThe formation of deposits and subsequent metamorphic processes that affect concentrations of radioactive elements in coal can indicate ongoing geological activities, therefore, analyzing trends in the radiation characteristics of coal throughout the ...
Nadezhda L. Aluker +2 more
doaj
Ophiolite Metamorphism and Ocean-Floor Metamorphism.
Journal of Geography (Chigaku Zasshi), 1995 Ophiolites of primary igneous origin have been more or less modified by later metamorphic processes, and there are several types of ophiolite metamorphism such as (1) the low-pressure type as recognized in ophiolites of the Mediterranean, Alps, Oman, Newfoundland, Chile, Taiwan, Borneo, California Coast Range, Hidaka Western Zone, and Horokanai, (2 ...
Hideo ISHIZUKA, Satoko SUZUKI
openaire +2 more sources
Plate Tectonics and Metamorphism: Teaching Complex Systems Using Videos and Animations
GeosciencesMetamorphism is a complex geologic process that is often poorly covered in introductory geology courses. This study explores the effectiveness of a video-based instructional intervention in improving student understanding of metamorphism and its ...
Siloa Willis, Robert J. Stern
doaj +1 more source