Results 21 to 30 of about 180 (171)

Megathrust Shear Modulated by Albite Metasomatism in Subduction Mélanges

Geochemistry, Geophysics, Geosystems, 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.
Kohtaro Ujiie, Kazuya Noro, Norio Shigematsu, Åke Fagereng, Naoki Nishiyama, Christopher J. Tulley, Haruna Masuyama, Yasushi Mori, Hiroyuki Kagi   +8 more
doaj   +1 more source

POSSIBLE EVIDENCE FOR THE EXISTENCE OF VOLCANOGENIC MAGMATISM IN THE SINYAYA RIVER BASIN AT THE SOUTHERN FLANK OF THE VILYUI SYNECLISE

Геодинамика и тектонофизика, 2023
The results of different-extension geological survey, exploration and thematic work methods show that the Vilyui syneclise is relatively amagmatic. However, the recent factual evidence in this region indicates the occurrence of magmatism of a different ...
V. V. Baranov, V. S. Grinenko, V. P. Afanasiev, S. S. Ugapieva, N. P. Pokhilenko, N. V. Popov, N. V. Zayakina, T.  I. Vasilieva   +7 more
doaj   +1 more source

Quantitative P–T–t–D Paths: A Key to decipher orogenic dynamics in the Variscan Aiguilles Rouges Massif (External Crystalline Massifs, Western Alps)

BSGF - Earth Sciences Bulletin
This study investigates the P–T–t–D evolution of two metapelitic samples from the middle crust exposed in the Aiguilles Rouges Massif. Garnet compositional mapping, phase equilibrium modelling, zirconium-in-rutile thermometry, trace element geochemistry ...
Vanardois Jonas, Trap Pierre, Goncalves Philippe, Roger Françoise, Lanari Pierre, Piccoli Francesca, Marquer Didier, Paquette Jean-Louis, Melleton Jérémie   +8 more
doaj   +1 more source

Finding of vanadium-bearing garnet from the Sor Rondane Mountains, East Antarctica

Antarctic Record, 1990
Vanadium-bearing green garnets have been found in the Menipa mountain mass, central part of the Sor Rondane Mountains, East Antarctica. These garnets are the main constituent minerals of granulite-facies metamorphosed graphite-bearing calcareous ...
Yasuhito Osanai, Teiichi Ueno, Noriyoshi Tsuchiya, Yuhei Takahashi, Yoshiaki Tainosho, Kazuyuki Shiraishi   +5 more
doaj   +1 more source

Petrology and mineral chemistry of peraluminous Marziyan granites, Sanandaj-Sirjan metamorphic belt (NW Iran)

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, Khalili Mahmoud, Beavers Roy, Sayari Mohammad   +3 more
doaj   +1 more source

Progress relating to calculation of partial melting equilibria for metapelites [PDF]

Journal of Metamorphic Geology, 2007
AbstractImproved activity–composition relationships for biotite, garnet and silicate liquid are used to construct updated P–T grids and pseudosections for high‐grade metapelites. The biotite model involves Ti charge‐balanced by hydrogen deprotonation on the hydroxyl site, following the substitution , where HD represents the hydroxyl site.
R. W. WHITE, R. POWELL, T. J. B. HOLLAND
openaire   +1 more source

The Influence of Thermal Differences and Variation of Cl–F–OH Ratios on Cu-Ni-PGE Mineralization in the Contact Aureole of the South Kawishiwi Intrusion, Duluth Complex

Geosciences, 2018
In the contact metamorphic aureole of the Duluth Complex, Cu-Ni-PGE mineralization occurs locally up to 100 m from the intrusion-footwall contact (Spruce Road area), whereas elsewhere (Dunka Pit deposit) the footwall granite and metapelite (Serpentine ...
Zsolt Benkó, Aberra Mogessie, Ferenc Molnár, Steven A. Hauck, Mark J. Severson, Karl Ettinger   +5 more
doaj   +1 more source

Genesis of metapelitic migmatites in the Adirondack Mountains, New York [PDF]

Journal of Metamorphic Geology, 2008
AbstractOxygen isotope ratios and rare earth element (REE) concentrations provide independent tests of competing models of injection v. anatexis for the origin of migmatites from amphibolite and granulite facies metasedimentary rocks of the Adirondack Mountains, New York.
Lancaster, P J, Fu, Bin, Page, F Z, Kita, Noriko T, Bickford, M E, Hill, B M, McLelland, J M, Valley, John   +7 more
openaire   +2 more sources

Ductile Extrusion Triggered by Continental Collision in NE Brazil

Terra Nova, Volume 38, Issue 4, Page 266-277, August 2026.
ABSTRACT The Borborema Province in northeastern Brazil hosts one of the world's largest strike‐slip shear zone networks, active during the late Neoproterozoic assembly of West Gondwana. Whether these shear zones initiated during active continental collision or as a post‐orogenic response to far‐field stresses remains debated.
L. R. Tesser, C. E. Ganade, C. R. Cioffi, J. B. Forshaw, M. Hueck, E. Celis, M. A. S. Basei   +6 more
wiley   +1 more source

Evidence for ca. 2046 Ma high-grade metamorphism in Paleoproterozoic metasedimentary rocks of the northern Borborema Province, NE Brazil: constraints from U-Pb (LA-ICP-MS) zircon ages

Journal of the Geological Survey of Brazil, 2019
This study presents LA-ICP-MS U-Pb detrital zircon ages on a migmatitic paragneiss of the Jaguaretama Complex, northern Borborema Province, NE-Brazil.
Bruno de Oliveira Calado, Felipe Grandjean Costa, Iaponira Paiva Gomes, Joseneusa Brilhante Rodrigues   +3 more
doaj   +1 more source