scholarly journals Dynamics of intraoceanic subduction initiation: 1. Oceanic detachment fault inversion and the formation of supra-subduction zone ophiolites

2015 ◽  
Vol 16 (6) ◽  
pp. 1753-1770 ◽  
Author(s):  
Marco Maffione ◽  
Cedric Thieulot ◽  
Douwe J. J. van Hinsbergen ◽  
Antony Morris ◽  
Oliver Plümper ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Detachment Fault ◽  
Subduction Initiation ◽  
Oceanic Detachment Fault

scholarly journals Subduction initiation along transform faults: The proto-Franciscan subduction zone

Lithosphere ◽  
2012 ◽  
Vol 4 (6) ◽  
pp. 484-496 ◽  
Author(s):  
John W. Shervais ◽  
Sung Hi Choi
Keyword(s):  
Subduction Zone ◽  
Transform Faults ◽  
Subduction Initiation

scholarly journals Subduction initiation terranes exposed at the front of a 2 Ma volcanically-active subduction zone

2019 ◽  
Vol 508 ◽  
pp. 30-40 ◽  
Author(s):  
Martin Patriat ◽  
Trevor Falloon ◽  
Leonid Danyushevsky ◽  
Julien Collot ◽  
Marlon M. Jean ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Subduction Initiation

The future of Earth's oceans: consequences of subduction initiation in the Atlantic and implications for supercontinent formation

2016 ◽  
Vol 155 (1) ◽  
pp. 45-58 ◽  
Author(s):  
JOÃO C. DUARTE ◽  
WOUTER P. SCHELLART ◽  
FILIPE M. ROSAS
Keyword(s):  
Atlantic Ocean ◽  
Conceptual Model ◽  
Subduction Zone ◽  
Subduction Zones ◽  
Plate Tectonics ◽  
Turning Point ◽  
Oceanic Lithosphere ◽  
Subduction Initiation ◽  
The Pacific ◽  
The Future

AbstractSubduction initiation is a cornerstone in the edifice of plate tectonics. It marks the turning point of the Earth's Wilson cycles and ultimately the supercycles as well. In this paper, we explore the consequences of subduction zone invasion in the Atlantic Ocean, following recent discoveries at the SW Iberia margin. We discuss a buoyancy argument based on the premise that old oceanic lithosphere is unstable for supporting large basins, implying that it must be removed in subduction zones. As a consequence, we propose a new conceptual model in which both the Pacific and the Atlantic oceans close simultaneously, leading to the termination of the present Earth's supercycle and to the formation of a new supercontinent, which we name Aurica. Our new conceptual model also provides insights into supercontinent formation and destruction (supercycles) proposed for past geological times (e.g. Pangaea, Rodinia, Columbia, Kenorland).

Effect of plate motion on plume-induced subduction initiation

2021 ◽  
Author(s):  
Marzieh Baes ◽  
Stephan Sobolev ◽  
Taras Gerya ◽  
Robert Stern ◽  
Sascha Brune
Keyword(s):  
Subduction Zone ◽  
Late Cretaceous ◽  
Subduction Zones ◽  
Plate Tectonics ◽  
Plate Motion ◽  
Cascadia Subduction Zone ◽  
Caribbean Plate ◽  
Subduction Initiation ◽  
Southern Margin ◽  
The Caribbean

<p>Subduction zones are key components of plate tectonics and plate tectonics could not begin until the first subduction zone formed. Plume-induced subduction initiation, which has been proposed as triggering the beginning of plate tectonics (Gerya et al., 2015), is one of the few scenarios that can break the lithosphere and recycle a stagnant lid without requiring any pre-existing weak zones. So far, two natural examples of plume-induced subduction initiation have been recognized. The first was found in southern and western margins of the Caribbean Plate (Whattam and Stern 2014). Initiation of the Cascadia subduction zone in Eocene times has been proposed to be the second example of plume-induced subduction initiation (Stern and Dumitru, 2019).</p><p>The focus of previous studies was to inspect plume-lithosphere interaction either for the case of stationary lithosphere (e.g., Gerya et al., 2015) or for moving lithosphere without considering the effect of lithospheric magmatic weakening above the plume head (e.g., Moore et al., 1998). In present study we investigate the response of moving oceanic lithosphere to the arrival of a rising mantle plume head including the effect of magmatic lithospheric weakening. We used 3D numerical thermo-mechanical modeling. Using I3ELVIS code, which is based on finite difference staggered grid and marker-in-cell with an efficient OpenMP multigrid solver (Gerya, 2010), we show that plate motion may affect the plume-induced subduction initiation only if a moderate size plume head (with a radius of 140 km in our experiments) impinges on a young but subductable lithosphere (with the age of 20 Myr). Outcomes indicate that lithospheric strength and plume buoyancy are key parameters in penetration of the plume and subduction initiation and that plate speed has a minor effect. We propose that eastward motion of the Farallon plate in Late Cretaceous time could play a key role in forming new subduction zones along the western and southern margin of the Caribbean plate.</p><p> </p><p>References:</p><p>Gerya, T., 2010, Introduction to Numerical Geodynamic Modelling.. Cambridge University Press.</p><p>Gerya, T.V., Stern, R.J., Baes, M., Sobolev, S.V. and Whattam, S.A., 2015. Plume-induced subduction initiation triggered Plate Tectonics on Earth. Nature, 527, 221–225.</p><p>Moore, W. B., Schubert, G. and Tackley, P., 1998, Three-dimensional simulations of plume-lithosphere interaction at the Hawaiian swell. Science, 279, 1008-1011.</p><p>Stern, R.J., and Dumitru, T.A., 2019, Eocene initiation of the Cascadia subduction zone: A second example of plume-induced subduction initiation? Geosphere, v. 15, 659-681.</p><p>Whattam, S.A. and Stern, R.J., 2014. Late Cretaceous plume-induced subduction initiation along the southern margin of the Caribbean and NW South America: The first documented example with implications for the onset of plate tectonics. Gondwana Research, 27, doi: 10.1016/j.gr.2014.07.011.</p>

scholarly journals The Cotoncello Shear Zone (Elba Island, Italy): The deep root of a fossil oceanic detachment fault in the Ligurian ophiolites

Lithos ◽  
2017 ◽  
Vol 278-281 ◽  
pp. 445-463 ◽  
Author(s):  
Chiara Frassi ◽  
Giovanni Musumeci ◽  
Michele Zucali ◽  
Francesco Mazzarini ◽  
Gisella Rebay ◽  
...  
Keyword(s):  
Shear Zone ◽  
Detachment Fault ◽  
Deep Root ◽  
Elba Island ◽  
Oceanic Detachment Fault

scholarly journals Pervasive silicification and hanging wall overplating along the 13°20′N oceanic detachment fault (Mid-Atlantic Ridge)

2017 ◽  
Vol 18 (6) ◽  
pp. 2028-2053 ◽  
Author(s):  
D. Bonnemains ◽  
J. Escartín ◽  
C. Mével ◽  
M. Andreani ◽  
A. Verlaguet
Keyword(s):  
Hanging Wall ◽  
Detachment Fault ◽  
Mid Atlantic Ridge ◽  
Oceanic Detachment Fault

Subduction initiation of the western Proto-Tethys Ocean: New evidence from the Cambrian intra-oceanic forearc ophiolitic mélange in the western Kunlun Orogen, NW Tibetan Plateau

2021 ◽  
Author(s):  
Qichao Zhang ◽  
Zhong-Hai Li ◽  
Zhenhan Wu ◽  
Xuanhua Chen ◽  
Ji’en Zhang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Subduction Zone ◽  
Geochemical Data ◽  
Subduction Initiation ◽  
Ophiolitic Mélange ◽  
Late Cambrian ◽  
Western Kunlun ◽  
Tethys Ocean ◽  
Subduction Input ◽  
Western Kunlun Orogen

The supra-subduction zone ophiolite or ophiolitic mélange formed in the forearc setting is generally considered to be a key geological record for subduction initiation (SI) with petrological characteristics comparable to the SI-related rock sequence from forearc basalt (FAB) to boninite in the Izu-Bonin-Mariana subduction zone. Nevertheless, the standard FAB and boninite are generally difficult to observe in the forearc rocks generated during SI. Yet, a typical rock sequence indicating the SI of the western Proto-Tethys Ocean is reported for the first time in the Qimanyute intra-oceanic forearc system in the western Kunlun Orogen, Northwest Tibetan Plateau. The magmatic compositions, which range from less to more high field strength element (HFSE)-depleted and large ion lithophile element (LILE)-enriched, are changing from oceanic plagiogranites (ca. 494 Ma) to forearc basalt-like gabbros (FAB-Gs, ca. 487 Ma), boninites, and subsequent Nb-enriched gabbros (NEGs, ca. 485 Ma), which are thus consistent with the Izu-Bonin-Mariana forearc rocks as well as the Troodos and Semail supra-subduction zone-type ophiolites. The geochemical data from the chemostratigraphic succession indicate a subduction initiation process from a depleted mid-oceanic-ridge (MORB)-type mantle source with no detectable subduction input to gradual increasing involvement of subduction-derived materials (fluid/melts and sediments). The new petrological, geochemical, and geochronological data, combined with the regional geology, indicate that the well-sustained FAB-like intrusive magmas with associated boninites could provide crucial evidence for SI and further reveal that the SI of the western Proto-Tethys Ocean occurred in the Late Cambrian (494−485 Ma).

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