Relationships of the Seismicity at the Alaska Subduction Zone to Metamorphism and the Deep Fluid Regime

2020 ◽  
Vol 56 (6) ◽  
pp. 892-899
Author(s):  
Margarita A. Nikitina ◽  
Mikhail V. Rodkin ◽  
Ivan G. Shmakov
Keyword(s):  
Subduction Zone ◽  
Fluid Regime ◽  
Deep Fluid

scholarly journals Pervasive detachment faults within the slow spreading oceanic crust at the poorly coupled Antilles subduction zone

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Boris Marcaillou ◽  
Frauke Klingelhoefer ◽  
Muriel Laurencin ◽  
Jean-Frédéric Lebrun ◽  
Mireille Laigle ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Oceanic Crust ◽  
Bathymetric Data ◽  
Detachment Faults ◽  
Spreading Ridges ◽  
Basement Rocks ◽  
Mid Atlantic Ridge ◽  
Slow Spreading ◽  
Deep Fluid ◽  
Shear Planes

AbstractOceanic crust formed at slow-spreading ridges is currently subducted in only a few places on Earth and the tectonic and seismogenic imprint of the slow-spreading process is poorly understood. Here we present seismic and bathymetric data from the Northeastern Lesser Antilles Subduction Zone where thick sediments enable seismic imaging to greater depths than in the ocean basins. This dataset highlights a pervasive tectonic fabric characterized by closely spaced sequences of convex-up Ridgeward-Dipping Reflectors, which extend down to about 15 km depth with a 15-to-40° angle. We interpret these reflectors as discrete shear planes formed during the early stages of exhumation of magma-poor mantle rocks at an inside corner of a Mid-Atlantic Ridge fracture zone. Closer to the trench, plate bending could have reactivated this tectonic fabric and enabled deep fluid circulation and serpentinization of the basement rocks. This weak serpentinized basement likely explains the very low interplate seismic activity associated with the Barbuda-Anegada margin segment above.

The effect of seismic deformation mechanisms on fluid migration in accumulation area of gold ore concentrations

2019 ◽  
Vol 484 (1) ◽  
pp. 87-92
Author(s):  
T. M. Zlobina ◽  
V. A. Petrov ◽  
K. Yu. Murashov ◽  
A. A. Kotov
Keyword(s):  
Fluid Flow ◽  
Flow Control ◽  
Deformation Mechanisms ◽  
Fluid Migration ◽  
Fluid Regime ◽  
Gold Ore ◽  
Fluid Flow Control ◽  
Seismic Deformation ◽  
Fluid Inflow ◽  
Main Influence

This study investigates the effect of mechanisms of paleode formations during the period of fluid inflow into the accumulation sphere of gold concentrations. Such mechanisms are believed to correspond to DC- and NDC- type seismic mechanisms, whose main influence on fluid migration lies on the formation of different, relative to fluid regime parameters, structural and hydrodynamic organizations of the ore-forming system, and fluid flow control within the area of the accumulation of ore concentrations.  

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