On the generation of deep focus earthquakes in subduction zones

1999 ◽  
Vol 12 (5) ◽  
pp. 573-583 ◽  
Author(s):  
Jie-Yuan Ning ◽  
Shao-Xian Zang
Keyword(s):  
2020 ◽  
Author(s):  
Huaiwei Ni

<p>Enhanced mutual solubility between silicate and water at elevated temperature and pressure in Earth’s interior (subduction zones in particular) allows the formation of supercritical geofluids with composition intermediate between silicate melts and aqueous fluids. The forming conditions of supercritical fluids are controlled by the critical curves, the wet solidi curves and the second critical endpoints of rock-H<sub>2</sub>O systems. With unusual physicochemical properties, supercritical fluids have the potential to play a crucial role in mediating material recycling at subduction zones, mobilizing and enriching ore-forming elements, inducing intermediate to deep focus earthquakes, and modulating Earth’s habitability. Challenges in the study of supercritical fluids using experimental and computational simulations as well as natural rocks and mineral deposits demand breakthroughs in future development of transformative technologies.</p>


2015 ◽  
Vol 37 ◽  
pp. 61-64
Author(s):  
Marco Scambelluri ◽  
Enrico Cannaò ◽  
Mattia Gilio ◽  
Marguerite Godard

2018 ◽  
Author(s):  
David Fernández-Blanco

Orogenic plateaus have raised abundant attention amongst geoscientists during the last decades, offering unique opportunities to better understand the relationships between tectonics and climate, and their expression on the Earth’s surface.Orogenic plateau margins are key areas for understanding the mechanisms behind plateau (de)formation. Plateau margins are transitional areas between domains with contrasting relief and characteristics; the roughly flat elevated plateau interior, often with internally drained endorheic basins, and the external steep areas, deeply incised by high-discharge rivers. This thesis uses a wide range of structural and tectonic approaches to investigate the evolution of the southern margin of the Central Anatolian Plateau (CAP), studying an area between the plateau interior and the Cyprus arc. Several findings are presented here that constrain the evolution, timing and possible causes behind the development of this area, and thus that of the CAP. After peneplanation of the regional orogeny, abroad regional subsidence took place in Miocene times in the absence of major extensional faults, which led to the formation of a large basin in the northeast Mediterranean. Late Tortonian and younger contractional structures developed in the interior of the plateau, in its margin and offshore, and forced the inversion tectonics that fragmented the early Miocene basin into the different present-day domains. The tectonic evolution of the southern margin of the CAP can be explained based on the initiation of subduction in south Cyprus and subsequent thermo-mechanical behavior of this subduction zone and the evolving rheology of the Anatolian plate. The Cyprus slab retreat and posterior pull drove subsidence first by relatively minor stretching of the crust and then by its flexure. The growth by accretion and thickening of the upper plate, and that of the associated forearc basins system, caused by accreting sediments, led to rheological changes at the base of the crust that allowed thermal weakening, viscous deformation, driving subsequent surface uplift and raising the modern Taurus Mountains. This mechanism could be responsible for the uplifted plateau-like areas seen in other accretionary margins. ISBN: 978-90-9028673-0


2017 ◽  
Author(s):  
Shannon E. Graham ◽  
◽  
John P. Loveless ◽  
John P. Loveless ◽  
Brendan J. Meade ◽  
...  

2021 ◽  
Vol 292 ◽  
pp. 452-467
Author(s):  
Rachel Bezard ◽  
Simon Turner ◽  
Bruce Schaefer ◽  
Gene Yogodzinski ◽  
Kaj Hoernle

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