Results 11 to 20 of about 75 (67)

Complex geochronological record of an emblematic Variscan eclogite (Haut‐Allier, French Massif Central)

Journal of Metamorphic Geology, Volume 41, Issue 7, Page 967-995, September 2023., 2023
Abstract Two eclogite samples from the Haut‐Allier record a prograde evolution from ~20 kbar, 650°C to 750°C, 22–23 kbar followed by heating up to 850–875°C and partial melting. Incipient decompression in high‐pressure granulite facies conditions (19.5 kbar, 875°C) was followed by exhumation to high‐temperature amphibolite facies conditions (<9 kbar ...
Luc de Hoÿm de Marien, Pavel Pitra, Marc Poujol, Nathan Cogné, Florence Cagnard, Benjamin Le Bayon   +5 more
wiley   +1 more source

Metamorphic Domes in Northern Tunisia: Exhuming the Roots of Nappe Belts by Widespread Post‐Subduction Delamination in the Western Mediterranean

Tectonics, Volume 42, Issue 6, June 2023., 2023
Abstract Cenozoic extension in the Western Mediterranean has been related to the dynamics of back‐arc domains. Although, in most of its orogenic belts extension propagated into the fore‐arc nappe domains. Here we revisit the structure, metamorphism and radiometric ages of the Tunisian Tell, where HP/LT rocks (350°C at 0.8 GPa), were exhumed by the ...
G. Booth Rea, S. Gaidi, F. Melki, W. Marzougui, P. Ruano, F. Nieto, J. M. Azañón, J. P. Galvé, K. Hidas, C. J. Garrido   +9 more
wiley   +1 more source

Protracted Thermal Evolution of a Migmatitic Terrane as Revealed by Multiple Geochronometers From the Retro‐Arc of the Early Paleozoic Famatinian Orogen in NW Argentina

Tectonics, Volume 42, Issue 3, March 2023., 2023
Abstract U‐Pb dates of zircon, monazite, and titanite combined with trace element composition, allows characterization of the thermal evolution of the migmatitic Agua del Sapo complex. This complex comprises Al‐rich and Ca‐rich metasedimentary rocks with a detrital zircon maximum depositional age of 550 Ma.
Pablo Farias, Roberto F. Weinberg, Alfonso Sola, Melanie Finch   +3 more
wiley   +1 more source

Implications of New Geological Mapping and U‐Pb Zircon Dating for the Barrovian Tectono‐Metamorphic Evolution of the Lepontine Dome (Central European Alps)

Geochemistry, Geophysics, Geosystems, Volume 24, Issue 3, March 2023., 2023
Abstract The Barrovian metamorphism of the Lepontine dome is manifested by isograds that cross‐cut tectonic nappe contacts, which is commonly interpreted as metamorphism that occurred after nappe emplacement. However, the pervasive mineral and stretching lineation in amphibolite facies, associated with top‐to‐foreland shearing, suggests that peak ...
A. Tagliaferri, F. L. Schenker, A. Ulianov, M. Maino, S. M. Schmalholz   +4 more
wiley   +1 more source

HTLP metamorphism and fluid‐fluxed melting during multistage anatexis of continental crust (N Sardinia, Italy)

Journal of Metamorphic Geology, Volume 41, Issue 1, Page 25-57, January 2023., 2023
Abstract The Variscan high‐grade metamorphic basement of northern Sardinia and southern Corsica record lower Carboniferous anatexis related to post‐collisional decompression of the orogen. Migmatites exposed in the Punta Bianca locality (Italy) consist of quartz + biotite + plagioclase + K‐feldspar orthogneisses, garnet and cordierite‐bearing diatexite
Leonardo Casini, Matteo Maino, Antonio Langone, Giacomo Oggiano, Stefania Corvò, Joan Reche Estrada, Montserrat Liesa   +6 more
wiley   +1 more source

Reaction‐Induced Mantle Weakening at High‐Pressure Conditions: An Example From Garnet Pyroxenites of Ulten Zone (Eastern Alps, N Italy)

Journal of Geophysical Research: Solid Earth, Volume 126, Issue 12, December 2021., 2021
Abstract Peridotites of Ulten Zone (Eastern Alps, N Italy) show a transition from coarse protogranular spinel lherzolites to fine‐grained amphibole + garnet peridotites, recorded by the crystallization of garnet coronas around spinel. Pyroxenite veins, transposed along the peridotite foliation, show a similar metamorphic evolution from coarse‐grained ...
L. Pellegrino, L. Menegon, S. Zanchetta, F. Langenhorst, K. Pollok, S. Tumiati, N. Malaspina   +6 more
wiley   +1 more source

The Relationship Between Crustal Architecture, Deformation, and Magmatism in the Coompana Province, Australia

Tectonics, Volume 39, Issue 12, December 2020., 2020
Abstract The Coompana Province, located between the three cratonic blocks of Australia, is significant for understanding the Proterozoic assembly of the continent. However, the basement rocks are completely covered and poorly understood, and as a result reconstructions are poorly constrained.
M. J. Pawley, R. A. Dutch, T. W. Wise
wiley   +1 more source

Microstructure and compositional changes across biotite‐rich reaction selvedges around mafic schollen in a semipelitic diatexite migmatite [PDF]

Journal of Metamorphic Geology, 2019
AbstractBiotite‐rich selvedges developed between mafic schollen and semipelitic diatexite in migmatites at Lac Kénogami in the Grenville Province of Quebec. Mineral equilibria modelling indicates that partial melting occurred in the mid‐crust (4.8–5.8 kbar) in the range 820–850°C.
Lina Lin, Edward W. Sawyer
openaire   +2 more sources

U-Pb SHRIMP dating of basement rocks of the Iriri-Xingu domain, Central Amazonian province, Amazonian craton, Brazil

Brazilian Journal of Geology, 2019
The Iriri-Xingu domain, located in the central part of the Amazonian craton, consists of extensive occurrences of Paleoproterozoic volcanic rocks and granites with published ages of ca.
Marcelo Lacerda Vasquez, Umberto Giuseppe Cordani, Kei Sato, Jaime dos Passos de Oliveira Barbosa, Maria Telma Lins Faraco, Victor Câmara Maurer   +5 more
doaj   +1 more source

Geochemical characteristics and conditions of formation of the Chah-Bazargan peraluminous granitic patches, ShahrBabak, Iran

Geologica Carpathica, 2017
Xenoliths of garnet-biotite-kyanite schist from the Qori metamorphic complex (southern part of the Sanandaj-Sirjan zone, northeast Neyriz, Zagros orogen in Iran) in the 173.0±1.6 Ma Chah-Bazargan leuco-quartz diorite intrusion were studied.
Fazlnia Abdolnaser
doaj   +1 more source