Results 21 to 30 of about 2,655 (203)

Insights into the magma plumbing system architecture beneath an off-ridge ocean island (Terceira, Azores) from crystal zoning

Volcanica
Understanding the architecture and dynamics of crustal magmatic plumbing systems is essential for interpreting volcanic processes and eruption styles in ocean island settings.
Kat Shepherd, Olivier Namur, David Neave, Yishen Zhang, Thomas Van Gerve, Tom Van Helden, Thibaut Van Acker, Stephan Klemme, Jasper Berndt-Gerdes, Bernard Charlier, Jacqueline Vander Auwera   +10 more
doaj   +1 more source

Cosmogenic ³He exposure dating in mafic rocks by “Virtual mineral separation” of pyroxene [PDF]

Geochronology
We describe a “virtual mineral separation” method for measuring the cosmogenic 3He concentration in pyroxene in mafic rocks that consist mainly of plagioclase and pyroxene, without physically separating the minerals. This approach is significantly faster
M. Bergelin, M. Bergelin, G. Balco, G. Balco, R. A. Ketcham   +4 more
doaj   +1 more source

MINERAL CHEMISTRY OF FELSIC EXTRUSIVE ROCKS OF THE EAST BAYMAK AREA OF THE SOUTHERN URALS AND APROBLEM OF HYBRIDISM IN THEIR GENESIS [PDF]

Минералогия, 2018
The Baymak ore district hosts numerous small Au-rich massive sulfide polymetallic deposits, which is a distinctive feature in comparison with other regions of the West-Magnitogorsk zone (Seravkin, 1986). According to geophysical data, the Baymak block is
A.M. Kosarev, S.A. Svetov, S.Yu. Chazhengina, G.T. Shafigullina   +3 more
doaj  

Emergent 1/3 magnetization plateaus in pyroxene CoGeO_{3}

Physical Review Research, 2021
Despite the absence of an apparent triangular pattern in the crystal structure, we observe unusually well-pronounced 1/3 magnetization plateaus in the quasi-one-dimensional Ising spin chain compound CoGeO_{3} which belongs to the class of pyroxene ...
H. Guo, L. Zhao, M. Baenitz, X. Fabrèges, A. Gukasov, A. Melendez Sans, D. I. Khomskii, L. H. Tjeng, A. C. Komarek   +8 more
doaj   +1 more source

Paragenesis relations study of wollastonite – pyroxene – garnet mineral assemblage in Vejeh Skarn (North East Isfahan) [PDF]

پترولوژی, 2017
The Vejeh Skarn is located at 70 km Northeast of Isfahan. The Vejeh intrusive body with granodiorite to tonalite composition have been intruded the lower Cretaceous marl carbonate which caused the formation of skarn rocks.
Ahmad Jamshidzaii, Mohammad Ali Mackizadeh, Farimah Ayati   +2 more
doaj   +1 more source

Anisotropy study of multiferroicity in the pyroxene NaFeGe2O6

New Journal of Physics, 2015
We present a study of the anisotropy of the dielectric, magnetic and magnetoelastic properties of the multiferroic clinopyroxene NaFeGe _2 O _6 . Pyroelectric currents, dielectric constants and magnetic susceptibilities as well as the thermal expansion ...
M Ackermann, L Andersen, T Lorenz, L Bohatý, P Becker   +4 more
doaj   +1 more source

Pyroxenes: a new class of multiferroics [PDF]

Journal of Physics: Condensed Matter, 2007
Pyroxenes with the general formula $AM$Si$_2$O$_6$ ($A$ = mono- or divalent metal, $M$ = di- or trivalent metal) are shown to be a new class of multiferroic materials. In particular, we have found so far that NaFeSi$_2$O$_6$ becomes ferroelectric in a magnetically ordered state below $\simeq 6$ K. Similarly, magnetically driven ferroelectricity is also
Jodlauk, S., Becker, P., Mydosh, J. A., Khomskii, D. I., Lorenz, T., Streltsov, S. V., Hezel, D. C., Bohaty, L.   +7 more
openaire   +2 more sources

Study on the composite fracture characteristics of filling and reinforcing cracked rock mass after high temperature damage

Deep Underground Science and Engineering, EarlyView.
Cement infill shares compressive and shear stresses during loading, while interfacial friction hinders crack propagation and reduces stress concentration, improving the rock's load‐bearing capacity. Failure modes vary with crack inclination. Unfilled specimens show four modes.
Shihao Yuan, Qiang Sun, Jianjun Hu, Liwei Zhang, Jishi Geng   +4 more
wiley   +1 more source

KIMBERLITE-LIKE ROCKS OF THE URIK-IYA GRABEN, EASTERN SAYAN REGION: MINERAL COMPOSITION, GEOCHEMISTRY AND FORMATION CONDITIONS

Геодинамика и тектонофизика, 2020
The study of the Bol’shaya Tagna alkaline-carbonatite massif and adjacent areas was focused on the mineral and chemical compositions of minerals, the distribution of petrogenic and trace elements in pyroxene-free alkaline picrites in veins and dikes ...
V. B. Savel'eva, Yu. V. Danilova, E. P. Bazarova, B. S. Danilov   +3 more
doaj   +1 more source

Research progress and current status of dynamic wave propagation characteristics in rock mass: A review

Deep Underground Science and Engineering, EarlyView.
This review elucidates the velocity–dispersion–attenuation coupling mechanisms of wave propagation in rock masses, compares six representative models, and reveals how pressure, temperature, mineral composition, and anisotropy jointly control dynamic responses in complex geological media.
Jiajun Shu, Tao Li, Ruiqi Yuan, Yue Li, Bingni Wu, Bo Liu, Zhengding Deng, Galindo Rubén, Fausto Molina‐Gómez   +8 more
wiley   +1 more source