Three-dimensional inversion of marine magnetic anomalies: Implications for crustal accretion along the Mid-Atlantic Ridge (28�?31�30? N)

Crustal accretion and evolution at slow and ultra-slow spreading mid-ocean ridges

“…A common observation in axial magnetization at the MAR is the inverse correlation between topography and magnetization amplitude; magnetization is typically larger at topographic lows (segment ends) than at topographic highs (segment centers) Hussenoeder et al, 1996;Pariso et al, 1996;Weiland et al, 1996;Ravilly et al, 1998]. Elevated axial magnetization is also observed at the tips of overlapping spreading centers and propagating ridges at intermediate-and fast-spreading ridges [Sempere, 1991;Wilson and Hey, 1995].…”

“…To stabilize the inversion, a bandpass filter tapered short wavelengths between 3.5-7 km and long wavelengths between SO-100 km. A common step in finalizing crustal magnetization estimates is adding to the inversion solution the annihilator, a magnetization distribution for the assumed magnetic source layer that produces no external magnetic field at the observation level [e.g., Pockalny et a!., 1995;Pariso et al, 1996;Weiland et al, 1996].…”

Geophysical signatures of past and present hydration within a young oceanic core complex

“…For Atlantis Massif, a 3-D model accounts for the juxtaposition of the older plate to the south of the Atlantis transform fault that cools the subaxial zone at the southern end of the spreading segment. Plate-driven mantle flow and lithospheric cooling were predicted [Blackman et al, 2008] assuming constant thermal diffusivity, half spreading rate of 12 mm/yr [Pariso et al, 1996], and top (seafloor) and bottom (100 km) boundaries of 0°C and 1350°C, respectively. Deviations from this reference model indicate the extent of heat advection by fault-controlled uplift of a deeper, warmer section of crust and/or cooling associated with seawater circulation.…”

Drilling into deep-seated hard rocks of the oceanic plate formed at the Mid-Ocean Ridge: results and future perspectives: Deep-seated Hard Rock Drilling

“…1 Central Dome Southern Ridge Fig. 3 0.5-2 Ma 24 mm/ Pariso et al, 1996Cann et al, 1997Blackman et al, 1998Blackman et al, , 2002Schroeder and John, 2004;Karson et al, 2006 Lost City Kelley et al, 2001;Früh-Green et al, 2003 Fig. 3 200-400 kg/m 3 Blackman et al, 1998;Nooner et al, 2003 3-5 km/s km 4-6 km/s Canales et al, 2008;Collins et al, 2010 100 m U1309 U1309B 100 m U1309D 1400 m Tamura et al, 2008;Godard et al, 2009Blackman et al, 2006Figs.…”