Results 71 to 80 of about 1,125 (137)

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

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

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

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

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  

Zircon Constraints on the Eruptive Sequence and Magma Evolution of Rhyolites at South Sister Volcano, Oregon

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 8, August 2024.
Abstract We present 230Th‐238U crystallization ages and trace element compositions for zircons spanning the late Pleistocene to Holocene rhyolite eruptive record at South Sister volcano in the central Oregon Cascade Range. Most zircon ages are between 100 and 20 ka, with very few in secular equilibrium (>350 ka).
Annika E. Dechert, Nathan L. Andersen, Josef Dufek, Christine E. Jilly   +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

Xenolith Petrochronology (San Luis Potosi, Mexico) Constrains Heat Sources for Cenozoic Ultrahigh‐Temperature Metamorphism in the Lower Crust

Journal of Geophysical Research: Solid Earth, Volume 129, Issue 8, August 2024.
Abstract Ultrahigh‐temperature (UHT; >900°C) metamorphism drives crustal differentiation and is widely recognized in the rock record, but its geodynamic causes are debated. Previous work on granulite‐facies metapelite xenoliths from San Luis Potosí, Mexico suggests the lower crust experienced a protracted UHT metamorphic event that coincided with the ...
Omar Khalil Droubi, Jacob H. Cipar, Andrew J. Smye, Joshua M. Garber   +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

Using U-Th-Pb petrochronology to determine rates of ductile thrusting: time windows into the Main Central Thrust, Sikkim Himalaya [PDF]

, 2015
Quantitative constraints on the rates of tectonic processes underpin our understanding of the mechanisms that form mountains. In the Sikkim Himalaya, late structural doming has revealed time-transgressive evidence of metamorphism and thrusting that ...
Catherine M. Mottram, Clare J. Warren, Daniele Regis, Goswami S., Jaffey A. H., Ludwig K. R., Nick M. W. Roberts, Nigel B. W. Harris, Randall R. Parrish, Tom W. Argles   +9 more
core   +2 more sources