scholarly journals Seismic and drilling constraints on velocity structure and reflectivity near IODP Hole U1309D on the central dome of Atlantis Massif, Mid-Atlantic Ridge 30°N

2009 ◽  
Vol 10 (1) ◽  
pp. n/a-n/a ◽  
Author(s):  
John A. Collins ◽  
Donna K. Blackman ◽  
Amber Harris ◽  
Richard L. Carlson
Keyword(s):  
Velocity Structure ◽  
Central Dome ◽  
Atlantis Massif ◽  
Mid Atlantic Ridge

Compositional heterogeneity and melt transport in mantle beneath Mid-Atlantic Ridge constrained by peridotite, dunite, and wehrlite from Atlantis Massif

Lithos ◽  
2020 ◽  
Vol 354-355 ◽  
pp. 105364
Author(s):  
Norikatsu Akizawa ◽  
Gretchen L. Früh-Green ◽  
Akihiro Tamura ◽  
Chiori Tamura ◽  
Tomoaki Morishita
Keyword(s):  
Compositional Heterogeneity ◽  
Melt Transport ◽  
Atlantis Massif ◽  
Mid Atlantic Ridge

scholarly journals Seismicity of the Atlantis Massif detachment fault, 30°N at the Mid-Atlantic Ridge

2012 ◽  
Vol 13 (10) ◽  
pp. n/a-n/a ◽  
Author(s):  
John A. Collins ◽  
Deborah K. Smith ◽  
Jeffrey J. McGuire
Keyword(s):  
Detachment Fault ◽  
Atlantis Massif ◽  
Mid Atlantic Ridge

scholarly journals Elastic and electrical properties and permeability of serpentinites from Atlantis Massif, Mid-Atlantic Ridge

2017 ◽  
Vol 211 (2) ◽  
pp. 686-699 ◽  
Author(s):  
Ismael Falcon-Suarez ◽  
Gaye Bayrakci ◽  
Tim A. Minshull ◽  
Laurence J. North ◽  
Angus I. Best ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Atlantis Massif ◽  
Mid Atlantic Ridge

Upper Mantle Structure beneath the Mid-Atlantic Ridge from Regional Waveform Modeling

2020 ◽  
Vol 110 (1) ◽  
pp. 18-25 ◽  
Author(s):  
Ingo Grevemeyer
Keyword(s):  
Upper Mantle ◽  
Velocity Structure ◽  
Vertical Component ◽  
Depth Interval ◽  
Mantle Structure ◽  
Waveform Modeling ◽  
Spreading Ridges ◽  
The Pacific ◽  
Upper Mantle Structure ◽  
Mid Atlantic Ridge

ABSTRACT The lithosphere is the outermost rigid layer of the Earth and includes the crust and brittle uppermost mantle. Because the poor seismic coverage of the ocean basins is the mantle structure of young lithosphere below midocean spreading centers poorly constrained, especially along slow spreading ridges. Surface waves radiated by midocean ridge earthquakes are excellent agents to study young lithosphere when being recorded in the vicinity of the ridge crest. Here, we use body and Rayleigh waves from six central Atlantic transform fault earthquakes with magnitude Mw>6 to constrain upper mantle structure away from ocean islands. Earthquakes were recorded by a network of broadband ocean-bottom seismometers deployed at the Mid-Atlantic Ridge (MAR) near 14°45′ N. Waveform modeling of vertical-component data at periods of 10–60 s yielded the velocity structure of the uppermost ∼100  km of the mantle and hence of the depth interval where lithospheric cooling is most evident. The data support that both S-wave velocity of the lithospheric lid and its thickness increases with age; velocities increase from 4.35 to 4.75  km/s and thickness from 30–50 to 70 km, sampling mantle with an average path age of ∼7 and 18 My, respectively. With respect to constraints found previously in the Pacific, lid velocities beneath the MAR are faster than beneath fast-spreading ridges, whereas asthenospheric velocities are similar to the Pacific. The fast velocity of the lid and slow velocity of the inversion zone may indicate effective hydrothermal cooling of the lithosphere.

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