Results 21 to 30 of about 1,311,765 (395)

Lithium Isotopic Compositions of Mesozoic and Cenozoic Basalts From South-Eastern China: Implications for Extremely Low δ7Li of Continental-Type Eclogites

open access: yesFrontiers in Earth Science, 2022
Lithium isotope geochemical studies of oceanic-type eclogites benefited from previous investigation of altered oceanic crust; however, processes of lithium isotope exchange operating on altered protoliths of continental-type eclogites have remained ...
Cheng-Long Yu   +10 more
doaj   +1 more source

Earth crust vertical movements according to ITRF2000, ITRF2005, ITRF2008 and ITRF2014 coordinate systems and their comparing analysis

open access: yesGeodesy and Geodynamics, 2018
The analysis of Earth’s crust movement vertical velocities was made both for separate regions, and averaged on regions. As input data coordinates and velocities of earth crust points, obtained in International Coordinate Systems ITRF2000, ITRF2005 ...
N.A. Chujkova   +3 more
doaj   +1 more source

No evidence for high-pressure melting of Earth’s crust in the Archean

open access: yesNature Communications, 2019
Much of the present-day volume of Earth’s continental crust had formed by the end of the Archean Eon, 2.5 billion years ago, through the conversion of basaltic (mafic) crust into sodic granite of tonalite, trondhjemite and granodiorite (TTG) composition.
R. H. Smithies   +11 more
semanticscholar   +1 more source

Expected geoneutrino signal at JUNO [PDF]

open access: yes, 2015
Constraints on the Earth's composition and on its radiogenic energy budget come from the detection of geoneutrinos. The KamLAND and Borexino experiments recently reported the geoneutrino flux, which reflects the amount and distribution of U and Th inside
Baldoncini, Marica   +6 more
core   +2 more sources

Relations between vertical and horizontal movements of the Earth crust

open access: yesGeodesy and Cartography, 2012
Horizontal and vertical movements of the Earth crust are interrelated, because the same forces affecting the Earth crust cause them. There is a both-side interrelation between deformations of the Earth crust and spreading of tectonic tensions.
Algimantas Zakarevičius
doaj   +1 more source

Thickness and structure of the martian crust from InSight seismic data

open access: yesScience, 2021
Single seismometer structure Because of the lack of direct seismic observations, the interior structure of Mars has been a mystery. Khan et al., Knapmeyer-Endrun et al., and Stähler et al.
B. Knapmeyer‐Endrun   +38 more
semanticscholar   +1 more source

Paradoxically lowered oxygen isotopes of hydrothermally altered minerals by an evolved magmatic water

open access: yesScientific Reports, 2022
It has been well known that the influxing meteoric water can hydrothermally lower oxygen and hydrogen isotopes of rocks and/or minerals during continental magmatic or metamorphic processes in certain appropriate cases.
Chun-Sheng Wei, Zi-Fu Zhao
doaj   +1 more source

Determination of Silicon Isotopic Compositions of Rock and Soil Reference Materials by MC-ICP-MS

open access: yesYankuang ceshi, 2023
BACKGROUND With the analytical technique development, the precision of Si isotopes analysis increases rapidly.Silicon isotopes are widely used in geochemistry, cosmochemistry, environmental chemistry and so on, and can be used to trace the circulation of
YANG Lin   +3 more
doaj   +1 more source

Geochemical insights into the role of metasomatic hornblendite in generating alkali basalts

open access: yesGeochemistry, Geophysics, Geosystems, 2014
Experimental petrology suggested the role of hornblendite in generating alkali basalt. This mechanism is confirmed by an integrated study of major‐trace elements and radiogenic isotopes for Mesozoic alkali basalts from the Qinling orogen in China.
Li‐Qun Dai   +2 more
doaj   +1 more source

Research on the Negative Externalities Evaluation for the Development of Weathered Crust Elution-Deposited Rare Earth Ores

open access: yesAdvances in Materials Science and Engineering, 2020
To standardize the specification of negative externality management of mining resources development and promote the process of marketization and diversification of ecological compensation, the article reviews the perspective and method of quantitative ...
Xu Ligang, Xu Meijuan
doaj   +1 more source

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