Melting of mantle peridotite at pressures approaching the spinel to garnet transition: Application to mid-ocean ridge basalt petrogenesis
نویسندگان
چکیده
منابع مشابه
A hydrous melting and fractionation model for mid-ocean ridge basalts: Application to the Mid-Atlantic Ridge near the Azores
[1] The major element, trace element, and isotopic composition of mid-ocean ridge basalt glasses affected by the Azores hotspot are strongly correlated with H2O content of the glass. Distinguishing the relative importance of source chemistry and potential temperature in ridge-hotspot interaction therefore requires a comprehensive model that accounts for the effect of H2O in the source on meltin...
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Earth’s dominant form of magmatism occurs at mid-ocean ridges (MORs), producing the igneous crust for two-thirds of the planet’s surface and conveying significant heat and material fluxes from the mantle to the world’s oceans. Mid-ocean-ridge basalt (MORB) magmas form from upwelling compositionally heterogeneous mantle1 by aggregation of near-fractional melts beneath spreading centres2. Multipl...
متن کاملPyroxenites from the Southwest Indian Ridge, 9^168E: Cumulates from Incremental Melt Fractions Produced at theTop of a Cold Melting Regime
The Southwest Indian Ridge (SWIR) at 9^168E and 52^538S is characterized by ultra-slow, oblique spreading and contains one of the few documented occurrences of pyroxenite veins associated with abyssal peridotites. The origin of these uncommon lithologies is still debated.We present a detailed study (including electron microprobe and laser ablation inductively coupled plasma mass spectrometry) o...
متن کاملMelting 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...
متن کاملGeneration of mid-ocean ridge basalts at pressures from 1 to 7 GPa
We propose a model for the generation of average MORBs based on phase relations in the CaO-MgO-Al2O3-SiO2-CO2 system at pressures from 3 to 7 GPa and in the CaO-MgO-Al2O3-SiO2-Na2OFeO (CMASNF) system at pressures from 0.9 to 1.5 GPa. The MELT seismic tomography (Forsyth et al., 2000) across the East Pacific Rise shows the largest amount of melt centered at 30-km depth and lesser amounts at grea...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Solid Earth
سال: 1997
ISSN: 0148-0227
DOI: 10.1029/96jb00988