Results 41 to 50 of about 6,037 (231)

Metamorphic Dehydration, Fluid Pressure, and the Frictional‐Viscous Transition Along Subduction Megathrusts: Case Study in Cascadia and Implications for Slow Earthquakes

AGU Advances, Volume 7, Issue 3, June 2026.
Abstract Relative plate motion in subduction zones transitions from frictional slip to viscous flow with increasing depth and temperature. The frictional‐viscous transition can control the depth extent of megathrust earthquakes and episodic tremor and slip (ETS).
So Ozawa, Eric M. Dunham, Cailey B. Condit   +2 more
wiley   +1 more source

metamorphism and deformation in the Belledonne Massif (Western Alps)

, 2021
The age and P–T conditions of Variscan high-P(HP) metamorphism in the Palaeozoic basement of the western Alps remain poorly constrained, but is nevertheless crucial to build a consistent tectonic scenario for the southeastern domain of the Variscan Belt.
Stéphane Guillot, Daniela Rubatto, Janots, Emilie, Jérémie Melleton, Guillot, Stéphane, Melleton, Jérémie, Rubatto, Daniela, Faure, Michel, Jacob, Jean‐Baptiste, Emilie Janots, Jean‐Baptiste Jacob, Michel Faure   +11 more
core   +1 more source

Eastward Growth of the Tibetan Plateau Linked to Cenozoic Orogenic Wedge Deformation and Fluctuating Melt Sources

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract The India–Asia collision continuously loads the Tibetan Plateau (TP), driving its Cenozoic eastward growth. This process has caused extensive crustal deformation and a diverse magmatic response. Here, we report on newly identified 35−6.5 Ma granitoids from Kangding area in southeastern (SE) TP.
Quan Ou, Jia‐Jing Mei, Derek A. Wyman, Jian‐Qing Lai, Feng Zi, Kun Wang, Jing‐Yi Liu, Jia Liao, Zhiwu Li   +8 more
wiley   +1 more source

Geochemistry and zircon U–Pb–Hf isotopes of the 780 Ma I-type granites in the western Yangtze Block: petrogenesis and crustal evolution

Soviet Economy, 2018
Neoproterozoic I-type granites could provide vital insights into the crust–mantle interaction and the crustal evolution along the western Yangtze Block, South China.
Yu Zhu, Shaocong Lai, Jiangfeng Qin, R. Zhu, Fangyi Zhang, Ze-zhong Zhang   +5 more
semanticscholar   +1 more source

Does Palsa Thaw in Northern Finland Contribute to Remobilisation of Metals Accumulated in Peat Into Surface Waters?

Land Degradation &Development, Volume 37, Issue 9, Page 4230-4250, 30 May 2026.
ABSTRACT Permafrost is rapidly degrading in the sporadic zone, including palsa mires in Scandinavia. Peatlands in the area have likely accumulated heavy metals from atmospheric deposition of industrial contaminants in the wider region. As the palsa mire chemical composition is not well known, and in other permafrost regions the permafrost thaw may ...
Joanna Katarzyna Jóźwik, Krystyna Kozioł, Marcin Frankowski, Marta Jakubiak, Kamil Nowiński, Mariusz Jędrysek, Danuta Szumińska, Żaneta Polkowska   +7 more
wiley   +1 more source

Sub-Basaltic sediments and metasediments of Mersey- Forth Area

Papers and proceedings of the Royal Society of Tasmania, 1967
Lacustrine sediments and silicified river gravels, slope deposits, in situ weathered material and joint fillings of Tertiary age in the Mersey-Forth area are described. An assessment is made of Tertiary drainage directions and the degree of post-basalt downcutting.
openaire   +1 more source

Block‐in‐Matrix Deformation and Veining in Alpine Subducted Oceanic Metasediments at Blueschist Facies Conditions

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 5, May 2026.
Abstract In subduction zones, the locked seismogenic zone is bordered by an upper and a lower transition zone. In these transition zones, deformation is primarily accommodated by an interplay of diffuse viscous deformation within a weak matrix and brittle deformation in stiffer bands and blocks.
L. Casoli, A. Petroccia, F. Giuntoli
wiley   +1 more source

SHRIMP U-Pb zircon dating of the host rocks of the Cannington Ag-Pb-Zn deposit, southeastern Mt Isa Block, Australia

, 2003
Copyright © 2003 Taylor and FrancisSHRIMP U-Pb zircon ages are reported from a paragneiss, a pegmatite, a metasomatised metasediment and an amphibolite taken from the upper amphibolite facies host sequence of the Cannington Ag-Pb-Zn deposit at the ...
Nutman, A., Giles, D, Giles, D., Nutman, Allen   +3 more
core   +1 more source

Are Estimates of Lower Continental Crust Bulk Composition Biased Due to Seismic Anisotropy?

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 5, May 2026.
Abstract Most seismic inferences on the bulk composition of the lower continental crust are based on P‐wave velocities inferred from seismic wide‐angle data, for which the direction of propagation in the target region is sub‐horizontal. Given the likely presence of anisotropy in many parts of the lower continental crust, these estimates could be biased
Zheng Luo, Othmar Müntener, György Hetényi, Klaus Holliger   +3 more
wiley   +1 more source

The High Resolution Transmission Electron Microscopy: A Powerful Tool for Studying the Organization of Terrestrial and Extra-Terrestrial Carbons

, 2005
International audienceHigh Resolution Transmission Electron Microscopy (HRTEM) makes possible the imaging of the profile of the polyaromatic layers, allowing a knowledge of carbons, such as disordered natural carbons from meteorites and from Precambrian ...
Rouzaud, Jean-Noel, Robert, F., Bonal, Lydie, Quirico, Eric, Skrzypczak, A., Derenne, S.   +5 more
core   +1 more source