Results 61 to 70 of about 1,125 (137)

Petrochronology of High‐Pressure Veins Reveals the Evolution of Fluid Sources in Subducted Oceanic Crust (Rocciavrè Eclogites, W. Alps)

Journal of Metamorphic Geology, Volume 43, Issue 3, Page 225-256, April 2025.
ABSTRACT The Rocciavrè massif is a large eclogitized ophiolitic fragment exposed in the Western Alps (Piemonte, Italy) exhibiting an almost complete sequence of the subducted Liguro‐Piemont lithosphere. Raman spectroscopy on carbonaceous material in metasediments from Rocciavrè and the juxtaposed Orsiera massif indicates maximum temperatures in the ...
Clément Herviou, Guillaume Bonnet, Samuel Angiboust, Aitor Cambeses, Tom Raimondo   +4 more
wiley   +1 more source

Polyphase Metamorphism of the Northern Rae Craton (Baffin Island, Arctic Canada) and Trace Element Behaviour in Monazite: Insights From Phase Equilibria Modelling and Geochronology

Journal of Metamorphic Geology, Volume 43, Issue 3, Page 287-314, April 2025.
ABSTRACT Integrated field mapping, phase equilibria modelling and in situ U–Pb monazite geochronology from the northern margin of the Rae craton on Baffin Island document three metamorphic events during the Neoarchean to the middle Paleoproterozoic.
Diane Skipton, Natasha Wodicka, Owen Weller, Simon Jackson, Marc St‐Onge, Benoit Saumur, Duane Petts   +6 more
wiley   +1 more source

Metamorphic modeling and petrochronology of metapelitic rocks from the Luminárias Nappe, southern Brasília belt (SE Brazil)

Brazilian Journal of Geology
The Luminárias Nappe was formed in the agglutination of West Gondwana. A high-pressure metamorphic gradient oblique to the geological contacts is recorded in metapelitic rocks from this Nappe.
Regiane Andrade Fumes, George Luiz Luvizotto, Renato Moraes, Monica Heilbron, Silvio Roberto Farias Vlach   +4 more
doaj   +1 more source

A zircon petrochronologic view on granitoids and continental evolution

Earth and Planetary Science Letters, 2020
Abstract Temporal trends in granitoid chemistry and thermometry constrain major global changes in magmatism, tectonism or crustal thickness in the continents. Our study relies on zircon geochronology and trace element geochemistry on four new detrital rocks (two modern sediments and two Archean metasedimentary rocks) and a global compilation of ...
C. Balica, M.N. Ducea, G.E. Gehrels, J. Kirk, R.D. Roban, P. Luffi, J.B. Chapman, A. Triantafyllou, J. Guo, A.M. Stoica, J. Ruiz, I. Balintoni, L. Profeta, D. Hoffman, L. Petrescu   +14 more
openaire   +3 more sources

Zircon Solubility, Metamict ZrSiO4 Replacement, and Hydrothermal Zircon Formation at Upper Crustal Pressures

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 3, March 2025.
Abstract Stable and inert under most conditions, zircon can be dissolved and precipitated by aqueous fluids in the upper crust. Geochemical models using currently available thermodynamic properties for Zr aqueous species at 0.2 GPa predict that zircon solubility increases with temperature from 400 to 900°C in fluids saturated with quartz or baddeleyite.
John C. Ayers, Chen Zhu
wiley   +1 more source

Thermokinematic evolution of the Annapurna-Dhaulagiri Himalaya, central Nepal: The composite orogenic system [PDF]

, 2016
The Himalayan orogen represents a ‘‘Composite Orogenic System’’ in which channel flow, wedge extrusion, and thrust stacking operate in separate ‘‘Orogenic Domains’’ with distinct rheologies and crustal positions.
Baëta R. D., Burchfiel B. C., Carosi R., Colchen M., Kruhl J. H., Kruhl J. H., Le Fort P., Le Fort P., Nicolas A., Passchier C. W., Pêcher A., Rosenberg C. L., Schmid S. M., Searle M. P., Valdiya K. S.   +14 more
core   +2 more sources

The magmatic–hydrothermal transition record in zircon: implications for zircon texture, composition and rare-metal granite dating (Beauvoir granite, French Massif Central) [PDF]

European Journal of Mineralogy
Zircon petrochronology is widely used to quantify the age and duration of magma emplacement and differentiation. However, in highly differentiated magmas, such as those forming rare-metal granites, zircon may form at the magmatic–hydrothermal transition,
N. Esteves, P. Bouilhol, U. Schaltegger, M. Ovtcharova, A. Navin Paul, A. Navin Paul, L. France, L. France   +7 more
doaj   +1 more source

Petrochronology and mineral chemistry of mid-crustal shear zones [PDF]

, 2022
Η χρονολόγηση πλαστικών ζωνών διάτμησης είναι μια διαδικασία με προκλήσεις επειδή πρέπει να αποδείξουμε είτε ότι το χρονόμετρο που επιλέξαμε αναπτύχθηκε είτε κατά την λειτουργία της ζώνης διάτμησης ή ότι η κρυσταλλοπλαστική παραμόρφωση προξένησε αναζωογόνηση της ηλικίας.
openaire   +1 more source

Insights Into Magma Reservoir Dynamics From a Global Comparison of Volcanic and Plutonic Zircon Trace Element Variability in Individual Hand Samples

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 11, November 2024.
Abstract Trace element compositional trends in zircons separated from single hand samples have been used to infer dynamic processes in magma reservoirs. Here, we compile published zircon trace element chemistry to quantify any systematic difference between the range of compositions observed in zircon from individual volcanic and plutonic hand samples ...
Barbara C. Ratschbacher, C. Brenhin Keller, Kari M. Cooper   +2 more
wiley   +1 more source

Titanite petrochronological data across the continental crust section exposed in Val d'Ossola (Ivrea-Verbano Zone, Italy)

Data in Brief
Titanite-bearing calc-silicates and mafic gneisses, metamorphosed under amphibolite- to granulite-facies conditions, crop out in Val d'Ossola area (Ivrea-Verbano Zone, Italy).
Stefania Corvò, Andrew R.C. Kylander-Clark, Antonio Langone   +2 more
doaj   +1 more source