Global correlations of ocean ridge basalt chemistry with axial depth and crustal thickness

between arc basalt composition and Moho depth Quantifying crustal thickness variations in evolving orogens : Correlation

A compilation of geochemical data from >50 active volcanoes where seismically defi ned Moho depth measurements are available, representing most volcanic arcs around the world, indicates a relation exists between crustal thickness (Moho depth) and the trace element composition of basalts. The best correlation exists for maximum light/heavy rare earth element (REE) ratios, and we use maximum Ce/Y...

Melting systematics in mid-ocean ridge basalts: Application of a plagioclase-spinel melting model to global variations in major element chemistry and crustal thickness

Woods Hole Road MS #22, Woods Hole, MA 02543, email: [email protected], phone: 508-289-3637, fax: 508-457-2187. Melting systematics in mid-ocean ridge basalts: Application of a 1 plagioclase-spinel melting model to global variations in major element 2 chemistry and crustal thickness 3 4 Mark D. Behn and Timothy L. Grove, 5 6 Department of Geology and Geophysics, Woods Hole Oceanographic Institutio...

Snowball Earth ocean chemistry driven by extensive ridge volcanism during

Crustal Thickness on the Mid-Atlantic Ridge: Bull's-Eye Gravity Anomalies and Focused Accretion.

Spreading segments of the Mid-Atlantic Ridge show negative bull's-eye anomalies in the mantle Bouguer gravity field. Seismic refraction results from 33 degrees S indicate that these anomalies can be accounted for by variations in crustal thickness along a segment. The crust is thicker in the center and thinner at the end of the spreading segment, and these changes are attributable to variations...

Causes for axial high topography at mid-ocean ridges and the role of crustal thermal structure

Mid-ocean ridge topography is modeled as the flexural response to loads using a thin plate approximation and setting thermal structure of the lithosphere to allow, but not require, a region of rapid cooling near the axis. Loads on the lithosphere arise from the presence of lowdensity melt, densification due to cooling with distance from the ridge axis, and thermal contraction stresses. We find ...