Results 1 to 10 of about 208,931 (182)

Water pumping in mantle shear zones [PDF]

Nature Communications, 2017
Water plays a key role in many geological processes, including weakening crystals in the crust and mantle. Here, using amphibole distribution and olivine dislocation slip-systems, the authors show that ductile flow also has a dynamic control on water ...
Jacques Précigout, Cécile Prigent, Laurie Palasse, Anthony Pochon   +3 more
doaj   +7 more sources

Refraction of shear zones in granular materials [PDF]

Physical Review Letters, 2007
We study strain localization in slow shear flow focusing on layered granular materials. A heretofore unknown effect is presented here. We show that shear zones are refracted at material interfaces in analogy with refraction of light beams in optics. This
J. Christoffersen, R. F. Craig, S. Luding, Tamás Unger   +3 more
core   +3 more sources

Shear-Induced Graphitization in Tongyuanpu Shear Zone, Liaodong Peninsula of Eastern China: Insights from Graphite Occurrences, Nanostructures and Carbon Sources [PDF]

Nanomaterials
An in-depth study of the genetic mechanisms of graphite in shear zones is crucial for understanding crustal weakening and the origins of inorganic carbon.
Mengyan Shi, Nannan Cheng, Jianbin Li, Quanlin Hou, Qianqian Guo, Jienan Pan   +5 more
doaj   +2 more sources

Strain Partitioning along Terrane Bounding and Intraterrane Shear Zones: Constraints from a Long-Lived Transpressional System in West Gondwana (Ribeira Belt, Brazil)

Lithosphere, 2022
Shear zones are zones of localized high strain accommodating differential motion in the lithosphere and impacting the crustal rheology and deformational history of orogenic belts.
F. M. Faleiros, B. V. Ribeiro, G. A. C. Campanha, P. A. Cawood, D. I. G. Cabrita, M. T. A. G. Yogi, L. A. Milani, D. V. Lemos-Santos, V. V. Almeida, S. W. O. Rodrigues, I. S. Malta, A. J. Forero-Ortega   +11 more
doaj   +1 more source

The Borborema Strike-Slip Shear Zone System (NE Brazil): Large-Scale Intracontinental Strain Localization in a Heterogeneous Plate

Lithosphere, 2021
Large-scale strike-slip faults are fundamental tectonic elements of the continental lithosphere. They constitute plate boundaries (continental transforms), separate terranes with contrasting geological histories within accretionary orogens, or ...
Sergio P. Neves, Andréa Tommasi, Alain Vauchez, Thais Andressa Carrino   +3 more
doaj   +1 more source

Microstructures and deformation mechanisms in Opalinus Clay: insights from scaly clay from the Main Fault in the Mont Terri Rock Laboratory (CH) [PDF]

Solid Earth, 2017
The Main Fault in the shaly facies of Opalinus Clay is a small reverse fault formed in slightly overconsolidated claystone at around 1 km depth. The fault zone is up to 6 m wide, with micron-thick shear zones, calcite and celestite veins, scaly clay and ...
B. Laurich, J. L. Urai, C. Nussbaum
doaj   +1 more source

A pilot Rb-Sr dating of the Suomusjärvi ultramylonite: evidence for major post-Svecofennian deformation in SW Finland [PDF]

Bulletin of the Geological Society of Finland, 1991
The Suomusjärvi shear zone in the West Uusimaa area in the Proterozoic Svecofennides of SW Finland belongs to a group of late, post-peak metamorphic structures comprising vertical shear zones and folds with vertical fold axes.
M. Ploegsma
doaj   +1 more source

The role of shearing in the Proterozoic development of the Åland archipelago, S.W. Finland [PDF]

Bulletin of the Geological Society of Finland, 1987
tion of a regional tectonochronology. Folds with E—W axial traces and associated shear zones which are characteristic of the southern Finland migmatite belt (1800 Ma) were refolded during a late phase of NW—SE shearing.
N.P. Branigan
doaj   +1 more source

Timing of syn-orogenic, high-grade transtensional shear zone formation in the West Uusimaa Complex, Finland [PDF]

Bulletin of the Geological Society of Finland, 2022
We present zircon and titanite U-Pb ages from granulite-facies transtensional shear zones and a greenschist facies strike-slip shear zone in the Karkkila-Vihti area, West Uusimaa. The zircon rim and titanite ages of c.
Taija Torvela, Matti Kurhila
doaj   +1 more source

Submagmatic to Solid-State Deformation Microstructures Recorded in Cooling Granitoids during Exhumation of Late-Variscan Crust in North-Eastern Sicily

Geosciences, 2020
Late-Variscan granitoid rocks of trondhjemitic and granitic composition, intruded in migmatitic paragneisses in the north-eastern Peloritani Mountains (southern Italy) at ~310 Ma and ~300 Ma, respectively, exhibit a range of deformation microstructures ...
Eugenio Fazio, Patrizia Fiannacca, Damiano Russo, Rosolino Cirrincione   +3 more
doaj   +1 more source