Results 21 to 30 of about 7,367 (214)

REE-Y-Ti-Th mineralization in the albite bearing metasomatite and metasomatized rhyolite hosted in Choghart magnetite-apatite deposit, Central Iran: Interplay of evaporitic brines, hydrothermal-magmatic fluids

Journal of Economic Geology, 2023
Macroscopic, microscopic and geochemical studies carried out on albite-bearing metasomatites and metasomatic rhyolites hosting the magnetite-apatite deposit of Chogharat indicate the presence of three generations of albite with different concentrations ...
Kiamars Hosseini, Roghayeh Zabihi Khargh, Mohammad Hossein Moradian Bafghi   +2 more
doaj   +1 more source

ONTOGENETIC APPROACH TO THE METASOMATISM THEORY [PDF]

Минералогия, 2016
Metasomatism is a phenomenon of substitution of some minerals by other minerals under simultaneous dissolution of early minerals and crystallization of late minerals.
V.A. Popov
doaj  

Metasomatism and Slow Slip: Talc Production Along the Flat Subduction Plate Interface Beneath Mexico (Guerrero)

Geochemistry, Geophysics, Geosystems, 2023
Talc‐rich rocks are common in exhumed subduction zone terranes and may explain geophysical observations of the subduction zone interface, particularly beneath Guerrero, Mexico, where the Cocos plate subducts horizontally beneath North America and ...
P. C. Lindquist, C. B. Condit, W. F. Hoover, D. Hernández‐Uribe, V. E. Guevara   +4 more
doaj   +1 more source

Megathrust shear modulated by Albite Metasomatism in subduction mélanges [PDF]

, 2022
Aseismic megathrust slip downdip of the seismogenic zone is accommodated by either steady creep or episodic slow slip events (SSEs). However, the geological conditions defining the rheology of megathrust slip remain elusive.
Nishiyama, Naoki, Kohtaro Ujiie, Tulley, Christopher J., Naoki Nishiyama, Masuyama, Haruna, Norio Shigematsu, Christopher J. Tulley, Åke Fagereng, Haruna Masuyama, Kagi, Hiroyuki, Ujiie, Kohtaro, Shigematsu, Norio, Mori, Yasushi, Hiroyuki Kagi, Fagereng, Åke, Noro, Kazuya, Yasushi Mori, Kazuya Noro   +17 more
core   +1 more source

Myrmekite formed by Ca-metasomatism [PDF]

, 1997
In this presentation, Ca-metasomatism of deformed K-feldspar to produce myrmekite in granite at Alastaro, Finland, is compared with K-metasomatism of deformed plagioclase to produce myrmekite as discussed in:\ud http://hdl.handle.net/10211.2/2971; \ud ...
Collins, Lorence G.
core   +1 more source

Field‐Based Evidence for Intra‐Slab High‐Permeability Channel Formation at Eclogite‐Facies Conditions During Subduction

Geochemistry, Geophysics, Geosystems, 2021
Fluid release from subducting oceanic lithosphere is a key process for subduction zone geodynamics, from controlling arc volcanism to seismicity and tectonic exhumation.
Francesca Piccoli, Jay J. Ague, Xu Chu, Meng Tian, Alberto Vitale Brovarone   +4 more
doaj   +1 more source

Paleocene‐Eocene High‐Pressure Carbonation of Western Alps Serpentinites: Positive Feedback Between Deformation and CO2‐CH4 Fluid Ingression Responsible for Slab Slicing?

Geochemistry, Geophysics, Geosystems, 2023
Meter‐ to hectometer‐size horizons of carbonate‐bearing talcschists are found along or near the contacts between the different Liguro‐Piemont subduction slices.
Clément Herviou, Guillaume Bonnet
doaj   +1 more source

Distinct Geochemical Behavior of Water in Olivine between Silicate and Carbonatite Metasomatism

, 2022
Metasomatism by silicate or carbonatite melts can significantly modify the mineral physical and chemical properties, and the hydrogen geochemical behavior during the interaction of olivine and melt remains unclear. In this study, olivine wate content was
Yi-Gang Xu, Yan-Qiang Zhang, Zhang, Le, Ben-Xun Su, Wan-Feng Zhang, Zhang, Yan-Qiang, Le Zhang, Su, Ben-Xun, Cui, Ze-Xian, Qing Yang, Xia, Xiao-Ping, Xu, Yi-Gang, Ze-Xian Cui, Xiao-Ping Xia, Zhang, Wan-Feng, Yang, Qing   +15 more
core   +1 more source

Infrared Spectral Evidence for K‐Metasomatism of Volcanic Rocks on Mars [PDF]

, 2021
Potassium metasomatism is a common geologic process occurring in a range of environments on Earth. K-metasomatism can dramatically change the chemistry of large volumes of crust resulting in formation of abundant K-rich feldspar while preserving original
Javier Cuadros, Timothy D. Glotch, Glotch, TD, Paul B. Niles, Michalski, JR, Joseph R. Michalski, Niles, PB, Cuadros, J   +7 more
core   +1 more source

Strong Physical Contrasts Across Two Mid‐Lithosphere Discontinuities Beneath the Northwestern United States: Evidence for Cratonic Mantle Metasomatism

AGU Advances, 2023
Mid‐lithosphere discontinuities are seismic interfaces likely located within the lithospheric mantle of stable cratons, which typically represent velocities decreasing with depth.
Tianze Liu, Emily J. Chin, Peter Shearer
doaj   +1 more source