1/1/2023 0 Comments At transform plate boundariesThermal structure of oceanic transform faults. Thermal-mechanical behavior of oceanic transform faults: implications for the spatial distribution of seismicity. Extreme mantle uplift and exhumation along a transpressive transform fault. Magmatism in the Garrett transform fault (East Pacific Rise near 13° 27ʹ S). A tectonic model for ridge-transform-ridge plate boundaries: implications for the structure of oceanic lithosphere. Seismic structure of the St Paul Fracture Zone and Late Cretaceous to mid Eocene oceanic crust in the equatorial Atlantic Ocean near 18° W. Seismic crustal structure and morpho-tectonic features associated with the chain fracture one and their role in the evolution of the equatorial Atlantic region. Evolution of the oceanic lithosphere in the equatorial Atlantic from Rayleigh wave tomography, evidence for small-scale convection from the PI-LAB experiment. A dynamic lithosphere–asthenosphere boundary near the equatorial Mid-Atlantic Ridge. A lithosphere–asthenosphere boundary and partial melt estimated using marine magnetotelluric data at the central Middle Atlantic Ridge. The role of volatiles in reactive melt transport in the asthenosphere. A new parameterization of hydrous mantle melting. Composition and microstructure of magma bodies from effective medium theory. Spreading-rate dependence of melt extraction at mid-ocean ridges from mantle seismic refraction data. Semibrittle seismic deformation in high-temperature mantle mylonite shear zone along the Romanche transform fault. A MATLAB toolbox and Excel workbook for calculating the densities, seismic wave speeds, and major element composition of minerals and rocks at pressure and temperature. Back-propagating supershear rupture in the 2016 M w 7.1 Romanche transform fault earthquake. Guillot, S., Schwartz, S., Reynard, B., Agard, P. Thermal structure of oceanic and continental lithosphere. Oceanic transform fault seismicity and slip mode influenced by seawater infiltration. Kohli, A., Wolfson-Schwehr, M., Prigent, C. Evidence for a deep hydrologic cycle on oceanic transform faults. Fracture-mediated deep seawater flow and mantle hydration on oceanic transform faults. Extensional tectonics and two-stage crustal accretion at oceanic transform faults. Inferring crustal structure in the Aleutian island arc from a sparse wide-angle seismic data set. Uppermost mantle velocity beneath the Mid-Atlantic Ridge and transform faults in the equatorial Atlantic Ocean. Water-rich sublithospheric melt channel in the equatorial Atlantic Ocean. Steady-state creation of crust-free lithosphere at cold spots in mid-ocean ridges. Age, spreading rates, and spreading asymmetry of the world’s ocean crust. Continental transforms: a view from the Alpine Fault. Earthquake slip on oceanic transform faults. GEBCO Bathymetric Compilation Group The GEBCO_2021 Grid: A Continuous Terrain Model of the Global Oceans and Land (BODC, 2021) ĭeMets, C., Gordon, R. Serpentinized peridotite versus thick mafic crust at the Romanche oceanic transform fault. Seismic velocity constraints on the material properties that control earthquake behavior at the Quebrada–Discovery–Gofar transform faults, East Pacific Rise. An updated digital model of plate boundaries. A new class of faults and their bearing on continental drift. It also suggests that migration and mixing of water-induced melt with the high-temperature melt may occur beneath the ridge axis. The presence of a thinned lithosphere at transform faults could explain observations of volcanism, thickened crust and intra-transform spreading centres at transform faults. Below 32 km is interpreted to be a low-temperature, water-induced melting zone that elevates the lithosphere–asthenosphere boundary, causing substantial thinning of the lithosphere at the transform fault. The water is considered to be sourced from seawater-derived fluids that infiltrate deep into the fault. We performed three-dimensional thermal modelling that suggests the anomaly is probably due to extensive serpentinization down to ~16 km, overlying a hydrated, shear mylonite zone down to 32 km. Here we present ultra-long offset seismic data from the Romanche transform fault in the equatorial Atlantic Ocean that indicates the presence of a low-velocity anomaly extending to ~60 km below sea level. However, the deep structure of these faults remains enigmatic. Away from active transform boundaries, former oceanic transform faults also form the fracture zones that cover the ocean floor. Transform faults accommodate the lateral motions between lithospheric plates, producing large earthquakes.
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