Results 71 to 80 of about 45,915 (265)

Diverse Continental Subduction Scenarios Along the Arabia‐Eurasia Collision Zone [PDF]

Geophysical Research Letters, 2018
AbstractIt is generally accepted that convergence of the Arabian and African plates is a subduction‐dominated process. However, the subduction scenarios are still debatable. Here we present a 3‐D model of the mantle to a depth of 700 km, based on a joint interpretation of the seismic tomography, residual topography, residual mantle gravity field, and ...
Mikhail K. Kaban, Alexey G. Petrunin, Sami El Khrepy, Nassir Al‐Arifi   +3 more
openaire   +6 more sources

Triggered seismicity associated with the 1990 Nicoya, Costa Rica, M-w=7.0 earthquake [PDF]

, 2009
The 25 March 1990 (M-w = 7.0) subduction megathrust earthquake that occurred offshore the Nicoya Peninsula, Costa Rica, produced a large number of aftershocks on the subduction plate interface as expected and preceded an unusual sequence of earthquakes ...
Bilek, SL, Elliott, CE, Lithgow-Bertelloni, C   +2 more
core   +1 more source

The making of pure quartzose sand in continental interiors: Paraná River (Brazil and Argentina)

Sedimentology, EarlyView.
ABSTRACT As part of a comprehensive project on sedimentary processes in South America, this study focuses on sediment generation in the intracratonic Paraná Basin and monitors the evolution of sand composition along the Paraná River from central Brazil to the Río de la Plata estuary in Argentina.
Eduardo Garzanti, Marta Barbarano, Mara Limonta, Guido Pastore, Pieter Vermeesch, Giovanni Vezzoli   +5 more
wiley   +1 more source

Factors on the Mesozoic Transition From Flat to Steep Subduction of the Paleo‐Pacific Plate Beneath South China: Thickened Oceanic Crust and Subduction Rate

Geochemistry, Geophysics, Geosystems, 2022
In the Mesozoic, the age of Paleo‐Pacific plate that flatly subducted beneath the South China was ∼80 Ma, resulting in a cold and dense oceanic slab. The transition process from flat to steep subduction of this old slab and factors that affect it are ...
Jiawei Jiang, Yadan Mao, Xiangyun Hu
doaj   +1 more source

Mobilization of tin during continental subduction-accretion processes

Geology, 2022
Abstract Major tin (Sn) deposits within the Variscan orogen are closely related to 325–270 Ma postkinematic granites that intruded the metamorphic rocks of the former precollisional accretionary wedge of the Gondwana margin. In the Erzgebirge (Germany), some of these metasedimentary rocks have high Sn contents (locally more than 1000 ppm
Romer, R., Kroner, U., Schmidt, C., Legler, C.   +3 more
openaire   +3 more sources

Detrital-zircon geochronology and provenance of the Ocloyic synorogenic clastic wedge, and Ordovician accretion of the Argentine Precordillera terrane [PDF]

, 2015
The Precordillera terrane in northwestern Argentina is interpreted to be anexotic (Laurentian) continental fragment that was accreted to western Gondwanaduring the Ordovician. One prominent manifestation of the subductionand collision process is a Middle?
Astini, Ricardo Alfredo, McClelland, William C., Mueller, Paul A., Thomas, William A.   +3 more
core   +1 more source

Cryogenian Glacial Erosion and Tectonics as Agents of Crustal Recycling

Terra Nova, EarlyView.
ABSTRACT Zircon preserves evidence of recycling processes that link surface environments to the mantle. Combined δ18O‐εHf in zircon fingerprints magmatic sources and tracks how crustal material is reworked over time. We apply statistical analyses to a global compilation that apparently resolves shifts in zircon U–Pb, δ18O, and Lu‐Hf data spanning the ...
M. Seraine, C. J. Spencer, T. M. Gernon, T. Hincks, C. L. Kirkland, E. Rugen, L. DaSilva, H. Shafaii Moghadam, L. P. Soares, G. Fazio   +9 more
wiley   +1 more source

Extrusion of subducted crust explains the emplacement of far-travelled ophiolites

Nature Communications, 2021
The interplay between continental subduction exhumation dynamics and the obduction of ophiolite sheets remains enigmatic. Here, the authors show that the extrusion of the subducted continental upper crust triggers the necking and breaking of the oceanic ...
Kristóf Porkoláb, Thibault Duretz, Philippe Yamato, Antoine Auzemery, Ernst Willingshofer   +4 more
doaj   +1 more source

Magmatic record of India-Asia collision [PDF]

, 2015
This work was financially co-supported by Chinese Academy of Sciences (XDB03010301) and other Chinese funding agencies (Project 973: 2011CB403102 and 2015CB452604; NSFC projects: 41225006, 41273044, and 41472061).New geochronological and geochemical data
Cawood, Peter Anthony, Chung, Sun-Lin, Liu, Sheng-Ao, Mo, Xuan-Xue, Niu, Yaoling, Wang, Qing, Wu, Fu-Yuan, Zhao, Zhi-Dan, Zhu, Di-Cheng   +8 more
core   +1 more source

3D Quantification of Subsidence During Pyrenean Retro‐Wedge Initiation: Role of Structural and Thermal Inheritance on Hyperextended Margin Inversion (Aquitaine Basin)

Terra Nova, EarlyView.
ABSTRACT We present novel 3D subsidence data enabling vertical movements' quantification during the early formation of the Pyrenean retro‐wedge. From Cenomanian to Turonian times, subsidence is relatively low (~26 ± 10 m/Myr), corresponding to a brief 10 Myr thermal re‐equilibration of the European lithosphere following the hyperextended rift episode ...
Benoit Issautier, Nicolas Saspiturry, Paul Angrand, Eric Lasseur, Simon Andrieu, Cécile Robin   +5 more
wiley   +1 more source