Results 1 to 10 of about 1,125 (137)

Constraining the Timing of Evolution of Shear Zones in Two Collisional Orogens: Fusing Structural Geology and Geochronology [PDF]

Geosciences, 2022
In recent decades, constraining the timing of shear activity has been one of the main topics of research about the tectono-metamorphic evolution of orogenic belts.
Rodolfo Carosi, Chiara Montomoli, Salvatore Iaccarino, Beatriz Benetti, Alessandro Petroccia, Matteo Simonetti   +5 more
doaj   +3 more sources

Monazite Microstructures and Their Interpretation in Petrochronology [PDF]

Frontiers in Earth Science, 2021
The phosphate mineral monazite (LREE,Y,Th,Ca,Si)PO4 occurs as an accessory phase in peraluminous granites and Ca-poor meta-psammopelites. Due to negligible common Pb and very low Pb diffusion rates at high temperatures, monazite has received increasing ...
Bernhard Schulz
doaj   +2 more sources

Accessory Mineral Eu Anomalies in Suprasolidus Rocks: Beyond Feldspar [PDF]

Geochemistry, Geophysics, Geosystems, 2020
Accessory mineral Eu anomalies (Eu/Eu*) are routinely measured to infer changes in the amount of feldspar over time, allowing accessory mineral U‐Pb dates to be linked to the progressive crystallization of igneous and metamorphic rocks and, by extension,
R. M. Holder, C. Yakymchuk, D. R. Viete
doaj   +2 more sources

Deeply subducted continental fragments – Part 2: Insight from petrochronology in the central Sesia Zone (western Italian Alps) [PDF]

Solid Earth, 2018
Subducted continental terranes commonly comprise an assembly of subunits that reflect the different tectono-metamorphic histories they experienced in the subduction zone.
F. Giuntoli, P. Lanari, M. Burn, B. E. Kunz, M. Engi   +4 more
doaj   +6 more sources

Episodic construction of the early Andean Cordillera unravelled by zircon petrochronology [PDF]

Nature Communications, 2021
Episodic magmatism of the early Andes is the result of a complex interplay between mantle, crust, slab and sediment contributions that can be traced using zircon chemistry.
José Joaquín Jara, Fernando Barra, Martin Reich, Mathieu Leisen, Rurik Romero, Diego Morata   +5 more
doaj   +4 more sources

Metasomatism and Mélange Development at the Conditions of Modern Deep Slow Slip: P‐T‐t Evolution of Metasomatic Rocks (Pimu'nga/Santa Catalina Island, CA)

Geochemistry, Geophysics, Geosystems
The subduction interface hosts megathrust earthquakes and ductile creep, is fluid‐rich and chemically dynamic, and produces metasomatic rocks that may host episodic tremor and slow slip (ETS).
W. Hoover, C. B. Condit, A. Moser, S. Mulcahy, P. C. Lindquist, V. E. Guevara   +5 more
doaj   +2 more sources

Eoarchean–Paleoproterozoic Tectonothermal History of the Acasta Gneiss Complex Constrained by Titanite and Apatite Petrochronology

Geochemistry, Geophysics, Geosystems
Deciphering Earth's earliest geodynamic processes requires temporally constrained chemical and structural data from rare exposures of ancient rocks.
Omar Khalil Droubi, Ann M. Bauer, Chloë Bonamici, William O. Nachlas, Joshua M. Garber, Michael J. Tappa, Jesse R. Reimink   +6 more
doaj   +2 more sources

Timing of Dike and Sill Emplacement in the Inner Aureole of the Alta Stock, Utah Determined by Zircon and Monazite Petrochronology

Geochemistry, Geophysics, Geosystems
Detailed geochronology from two compositionally distinct generations of dikes and sills intruded into the Alta metamorphic aureole, north‐central Utah, complement previous geochronologic studies from the Alta stock, providing information on the timing of
C. J. Beno, M. A. Stearns, J. R. Bowman, J. M. Bartley, D. P. Fernandez, A. R. C. Kylander‐Clark   +5 more
doaj   +2 more sources

Petrochronology of polygenetic white micas (Naxos, Greece) [PDF]

Journal of Metamorphic Geology, 2022
Naxos in the Greek Cyclades preserves a type example of polymetamorphism. The southern and northern parts of the island record different Tertiary P–T histories between Eocene and Miocene times, including a blueschist facies event, one or more amphibolite/
Glodny, Johannes, Peillod, Alexandre, Ring, Uwe, Skelton, Alasdair, Villa, Igor M.   +4 more
core   +7 more sources

The Addition of Felsic Sediments to the Lower Continental Crust During the Variscan Orogeny

Geochemistry, Geophysics, Geosystems
Lower crustal metasedimentary xenoliths (garnet‐sillimanite granulites) from the Bournac breccia pipe in the Massif Central, France, provide a robust example of sediments transported to depth and incorporated into stable lower continental crust during a ...
M. F. Ringwood, S. E. Ortner, R. L. Rudnick   +2 more
doaj   +2 more sources