Results 1 to 10 of about 13,955 (253)

Subduction Duration and Slab Dip [PDF]

Geochemistry, Geophysics, Geosystems, 2020
The dip angles of slabs are among the clearest characteristics of subduction zones, but the factors that control them remain obscure. Here, slab dip angles and subduction parameters, including subduction duration, the nature of the overriding plate, slab
Jiashun Hu, Michael Gurnis
doaj   +3 more sources

Plume-Induced Subduction Initiation: Revisiting Models and Observations

Frontiers in Earth Science, 2021
Subduction initiation induced by a hot and buoyant mantle plume head is unique among proposed subduction initiation mechanisms because it does not require pre-existing weak zones or other forces for lithospheric collapse.
Marzieh Baes, Marzieh Baes, Robert J. Stern, Scott Whattam, Taras V. Gerya, Stephan V. Sobolev, Stephan V. Sobolev   +6 more
doaj   +1 more source

Joint Geodynamic‐Geophysical Inversion Suggests Passive Subduction and Accretion of the Ontong Java Plateau

Geophysical Research Letters, 2022
In this study, we for the first time applied a joint geodynamic‐geophysical inversion approach to oceanic plateau subduction models, and compared the subduction style and corresponding topography and Bouguer gravity of two representative subduction ...
Hao Dong, Liming Dai, Lijun Liu, Xiaodian Jiang, Sanzhong Li, Wei Gong, Liangliang Wang, Di Wang, Zhong‐Hai Li, Shengyao Yu   +9 more
doaj   +1 more source

Self-replicating subduction zone initiation by polarity reversal

Communications Earth & Environment, 2022
New subduction zones can form via a self-replicating process, without the need for external forcing, when buoyant blocks reach pre-existing subduction trenches and cause polarity reversals, according to 3D numerical ...
Jaime Almeida, Nicolas Riel, Filipe M. Rosas, João C. Duarte, Boris Kaus   +4 more
doaj   +1 more source

Ophiolites in the Central Asian Orogenic Belt record Cambrian subduction initiation processes

Communications Earth & Environment
Subduction initiation remains elusive because no present example exists. Ophiolites formed over nascent subduction zones in the past provide the key to constraining the processes of subduction initiation.
Mingshuai Zhu, Daniel Pastor–Galán, Matthijs A. Smit, Laicheng Miao, Miao Dong, Fuqin Zhang, Dorjgochoo Sanchir, Ariuntsetseg Ganbat, Chenghao Liu, Ye Luo, Shun Li   +10 more
doaj   +1 more source

Reaction-induced rheological weakening enables oceanic plate subduction

Nature Communications, 2016
Plate subduction initiation requires weak boundaries between tectonic plates, but how weaknesses develop is unclear. Here, using high-pressure friction experiments on peridotite gouge material, the authors show that hydration reactions contribute to the ...
Ken-ichi Hirauchi, Kumi Fukushima, Masanori Kido, Jun Muto, Atsushi Okamoto   +4 more
doaj   +1 more source

Subduction Initiation at the Corner of Small Oceanic Basins

Geophysical Research Letters
In Southeast Asia, emerging subduction zones often appear to begin at the corners of small oceanic basins, which have a triangular‐indenter continent–ocean boundary geometry.
Miao Dong, Tianyao Hao, Yue Li, Jian Zhang, Gui Fang   +4 more
doaj   +1 more source

Slab Temperature Evolution Over the Lifetime of a Subduction Zone

Geochemistry, Geophysics, Geosystems, 2021
The thermal evolution of subducting slabs controls a range of subduction processes, yet we lack a robust understanding of how thermal structure develops over a subduction zone's lifetime. We investigate the time‐dependence of slab thermal structure using
A. F. Holt, C. B. Condit
doaj   +1 more source

Plume‐like upper mantle instabilities drive subduction initiation [PDF]

Geophysical Research Letters, 2010
The control of upper mantle‐lithosphere interactions (MLI) on compressional tectonics is not well resolved. This applies to the role of MLI in triggering of subduction initiation or lithosphere mantle (LM) downwellings. We present results of thermo‐mechanically thermo‐dynamically coupled numerical experiments that are consistent with an array of recent
Burov, Evgenii, Cloething, S.
openaire   +3 more sources

Contribution of ultramafic rocks in central Sanandaj-Sirjan zone to the characterizing of physio-chemical condition during initiation of subduction [PDF]

پترولوژی, 2018
In the central part of the Sanandaj-Sirjan zone, there is an ultramafic rock exposure (hornblendite and pyroxenite) adjacent to Molataleb felsic complex completely located between Azna and Aligoodarz towns.
Amir Esna-Ashari, Fatemeh Sarjoughian
doaj   +1 more source