Results 141 to 150 of about 220,882 (295)

On the Influence of Pressure, Phase Transitions, and Water on Large‐Scale Seismic Anisotropy Underneath a Subduction Zone

Geochemistry, Geophysics, Geosystems
Seismic anisotropy mainly originates from the crystallographic preferred orientation (CPO) of minerals deformed in the convective mantle flow. While fabric transitions have been previously observed in experiments, their influence on large‐scale ...
John Keith Magali, Christine Thomas, Estelle Elisa Ledoux, Yann Capdeville, Sébastien Merkel   +4 more
doaj   +1 more source

Stability field of phase Egg, AlSiO 3 OH at high pressure and high temperature: possible water reservoir in mantle transition zone

, 2017
High–pressure and high–temperature experiments were conducted to determine the stability field of phase Egg, AlSiO3OH, in the pressure range of 16.5–23.5 GPa and in the temperature range of 800–1500 °C.
K. Fukuyama, E. Ohtani, Y. Shibazaki, H. Kagi, A. Suzuki   +4 more
semanticscholar   +1 more source

Evolution Model for the Paleoproterozoic Talvivaara Mudstone‐Hosted Ni‐Zn‐Cu‐Co Deposit in Fennoscandia

Terra Nova, EarlyView.
ABSTRACT The Paleoproterozoic Talvivaara mudstone is a very large sulfidic Ni‐Co deposit that records enhanced organic matter accumulation during the global Shunga Event. Here, rock geochemistry and microscale S and Fe isotope composition of in situ pyrrhotites and pyrites are studied in well‐characterised, well‐preserved drill core samples.
Raimo Lahtinen, Jaakko J. Laitala, Joonas J. Virtasalo, Martin J. Whitehouse   +3 more
wiley   +1 more source

The Seismic Expression of Core Complex‐Style Extensional Detachment Faults in Rifted Margins

Terra Nova, EarlyView.
ABSTRACT The identification of core complex‐style extensional detachment faults (CCDFs) in rifted margins is crucial for accurately restoring their stratigraphic and thermal histories. Yet recognising CCDFs in seismic reflection images is challenging due to their faint topographic expression; the lack of associated abrupt offset in seismic reflections;
Pauline Chenin, Gianreto Manatschal, Cuimei Zhang, Peng Chao   +3 more
wiley   +1 more source

Slab morphology and deformation beneath Izu-Bonin

Nature Communications, 2019
In the 1000 km long Izu-Bonin subduction zone to the south of Tokyo, the Pacific Plate descends beneath the Philippine Sea Plate. Here the authors use teleseismic double-difference tomography to image the complex morphology of the Izu-Bonin slab ...
Haijiang Zhang, Fan Wang, Robert Myhill, Hao Guo   +3 more
doaj   +1 more source

Ductile Extrusion Triggered by Continental Collision in NE Brazil

Terra Nova, EarlyView.
ABSTRACT The Borborema Province in northeastern Brazil hosts one of the world's largest strike‐slip shear zone networks, active during the late Neoproterozoic assembly of West Gondwana. Whether these shear zones initiated during active continental collision or as a post‐orogenic response to far‐field stresses remains debated.
L. R. Tesser, C. E. Ganade, C. R. Cioffi, J. B. Forshaw, M. Hueck, E. Celis, M. A. S. Basei   +6 more
wiley   +1 more source

Tracing the subducting Pacific slab to the mantle transition zone with hydrogen isotopes. [PDF]

Sci Rep, 2021
Kuritani T, Shimizu K, Ushikubo T, Xia QK, Liu J, Nakagawa M, Taniuchi H, Sato E, Doi N.   +8 more
europepmc   +1 more source

Elastic properties of Fe-bearing Akimotoite at mantle conditions: Implications for composition and temperature in lower mantle transition zone. [PDF]

Fundam Res, 2022
Zhao Y, Wu Z, Hao S, Wang W, Deng X, Song J.   +5 more
europepmc   +1 more source

Fine structure of an oceanic crustal section near the East Pacific Rise [PDF]

, 1978
In this study we model synthetically a complete seismic profile of roughly 20-m.y.-old crust located to the west of the East Pacific Rise, 3.37S, 114.13W.
Engen, G., Helmberger, D. V.
core  

P wave radial anisotropy tomography of the upper mantle beneath the North China Craton

Geochemistry, Geophysics, Geosystems, 2014
We present the first P wave radial anisotropy tomography of the crust and upper mantle beneath the North China Craton (NCC), determined using a large number of high‐quality arrival‐time data of local earthquakes and teleseismic events. Our results show a
Jian Wang, Huohua Wu, Dapeng Zhao
doaj   +1 more source