Results 31 to 40 of about 100,457 (323)
Journal of Metamorphic Geology, 2018 Migmatites comprise a minor volume of the high‐grade part of the Damara orogen of Namibia that is dominated by granite complexes and intercalated metasedimentary units.
Stefan Jung +4 more
semanticscholar +1 more source
OH point defects in quartz – a review [PDF]
European Journal of Mineralogy, 2021 Research results of the past 6 decades on the incorporation of OH point defects in quartz are summarised and evaluated in terms of their application to natural samples and processes, and a link between experimental petrology, natural archives, and model ...
R. Stalder
doaj +1 more source
地质科技通报, 2023 The Miaoya complex in Hubei Province hosts one of the most important REE deposit in China. This complex is composed of syenite, carbonatite (SiO2 < 10%), and a suite of silica-rich carbonatite (SiO2>30%).
Yinqiu Hu, Bin Wu, Qian Ren
doaj +1 more source
Charnockites: Petrologic and phase equilibria characterization of some global examples
Geosystems and Geoenvironment, 2023 Charnockites (orthopyroxene-bearing granitoids) constitute one of the major components in many Precambrian high-grade metamorphic terranes of the world.
Toshiaki Tsunogae +2 more
doaj
Participation in the U.S. Ellsworth Mountains operation of the 1979-1980 austral summer, Antarctica
Antarctic Record, 1981 Field activities in the Ellsworth Mountains in the 1979-1980 austral summer were supported from a temporary U.S. base camp. To study metamorphic petrology, the author mainly surveyed Marble Hills, Liberty Hills, Edison Hills, High Nunatak, and Wilson ...
Masaru Yoshida
doaj +1 more source
Production of $^3$He in Rocks by Reactions Induced by Particles of the Nuclear-Active and Muon Components of Cosmic Rays: Geological and Petrological Implications [PDF]
Petrology, 2016, Vol. 24, No. 1, pp. 21-34, 2016 The paper presents data on the production of the $^3$He nuclide in rocks under the effect of cosmic-ray particles. The origin of the nuclide in the ground in neutron- and proton-induced spallation reactions, reactions induced by high-energy muons, and negative muon capture reactions is analyzed.
arxiv +1 more source
Tectonics may affect closed watersheds used to monitor climate change and human activity effects
Terra Nova, Volume 35, Issue 1, Page 58-65, February 2023., 2023 Abstract Playa lakes developed in closed watersheds have been used as environmental impact indicators (global warming, water extractions, etc.), but they could be also sensitive to active tectonics. Our study area is located in the main watershed in the western Betics, the northern branch of the Gibraltar arc, which is within the fold‐and‐thrust belt ...
Alejandro Jiménez‐Bonilla +2 more
wiley +1 more source
Geologica Carpathica, 2015 The Marziyan granites are located in the north of Azna and crop out in the Sanandaj-Sirjan metamorphic belt. These rocks contain minerals such as quartz, K-feldspars, plagioclase, biotite, muscovite, garnet, tourmaline and minor sillimanite.
Darvishi Esmaiel +3 more
doaj +1 more source
Broken Beds, but better science; using multiple hypotheses to interpret geological data
Terra Nova, Volume 35, Issue 1, Page 73-82, February 2023., 2023 Abstract In this study, we propose a multiple hypotheses approach to improve interpretations of limited remotely sensed datasets, such as sparsely exposed outcrops, subsurface datasets, or planetary objects using semi‐quantitative scoring and ranking of observable features.
Arnaud Gallois +3 more
wiley +1 more source
Potassium Isotope Compositions of Carbonaceous and Ordinary Chondrites: Implications on the Origin of Volatile Depletion in the Early Solar System [PDF]
, 2020 Solar system materials are variably depleted in moderately volatile elements (MVEs) relative to the proto-solar composition. To address the origin of this MVE depletion, we conducted a systematic study of high-precision K isotopic composition on 16 carbonaceous chondrites (CCs) of types CM1-2, CO3, CV3, CR2, CK4-5 and CH3 and 28 ordinary chondrites ...
arxiv +1 more source