Results 71 to 80 of about 1,148 (153)

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

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

Multiple Metamorphic Stages within an Eclogite-facies Terrane (Sesia Zone, Western Alps) Revealed by Th-U-Pb Petrochronology [PDF]

, 2017
Convergent plate margins typically experience a transition from subduction to collision dynamics as massive continental blocks enter the subduction channel. Studies of high-pressure rocks indicate that tectonic fragments are rapidly exhumed from eclogite
Cenki-Tok, B., Darling, J., Engi, M., Regis, D., Rubatto, D., Zucali, M.   +5 more
core  

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

Slip History, Tectonic Evolution, and Fault Zone Structure Along the Southern Alpine Fault, New Zealand

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 11, November 2024.
Abstract The study of active fault zones is fundamental to understanding both long‐term tectonics and short‐term earthquake behavior. Here, we integrate lidar‐enabled geomorphic‐geologic mapping and petrochronological analysis to reveal the slip‐history, tectonic evolution, and structure of the southern Alpine Fault in New Zealand.
A. M. Mere, N. C. Barth, J. J. Schwartz, A. Kylander‐Clark   +3 more
wiley   +1 more source

Paleozoic Episodic Magmatism in Western Tianshan: Insight Into Assembling the Northeastern Pangea

Geochemistry, Geophysics, Geosystems
The late‐stage union of Pangea was associated with the convergence of Siberia with Laurussia, but the exact timing remains unclear. The orogenic duration of the Kazakhstan block can provide geochronological constraints as it connects Siberia, Baltica ...
Kai Wang, Keda Cai, Min Sun, Chun‐Kit Lai, Xiao‐Ping Xia, Xiangsong Wang, Zihe Bao   +6 more
doaj   +1 more source

High Throughput Petrochronology and Sedimentary Provenance Analysis by Automated Phase Mapping and LAICPMS [PDF]

, 2017
The first step in most geochronological studies is to extract dateable minerals from the host rock, which is time consuming, removes textural context, and increases the chance for sample cross contamination.
Chayes F., Chris Mattinson, D'Lemos R., Eduardo Garzanti, Ethan Petrou, Galehouse J. S., Griffin W., Jenny Omma, Martin Rittner, Pieter Vermeesch   +9 more
core   +2 more sources

Carboniferous Barrovian to Permian Buchan‐type metamorphic cycles in the Mongolian Altai Zone: Implication for pressure cycles in accretionary orogens

Journal of Metamorphic Geology, Volume 42, Issue 7, Page 979-1033, September 2024.
Abstract In the Altai Accretionary Wedge, several periods of Barrovian‐ and Buchan‐type metamorphic cycles were dated from Ordovician to Permian. However, the timing and link between these cycles are not clear, and their causes are debated. In order to contribute to the understanding of Barrovian‐ to Buchan‐type evolution of the accretionary wedges, we
Carmen Aguilar, Pavla Štípská, Karel Schulmann, Andrew R. C. Kylander‐Clark, Ondrej Lexa, Turbold Sukhbaatar, Vít Peřestý, Yingde Jiang, Pavel Hanžl   +8 more
wiley   +1 more source

Modification of the isotopic and geochemical compositions of accessory minerals controlled by microstructural setting

Journal of Metamorphic Geology, Volume 42, Issue 7, Page 957-978, September 2024.
Abstract In situ age and trace element determinations of monazite, rutile and zircon grains from an ultrahigh temperature (UHT) metapelite‐hosted leucosome from the Napier Complex using laser split‐stream analysis reveal highly variable behaviour in both the U–Pb and trace element systematics that can be directly linked to the microstructural setting ...
Chris Clark, Richard J. M. Taylor, Malcolm P. Roberts, Simon L. Harley   +3 more
wiley   +1 more source

Tectonics and crustal evolution [PDF]

, 2016
We thank the Natural Environment Research Council (grants NE/J021822/1 and NE/K008862/1) for funding.The continental crust is the archive of Earth's history.
Cawood, Peter A., Dhuime, Bruno, Hawkesworth, Chris J.   +2 more
core   +4 more sources