Peridotite composition from the North Atlantic: regional and tectonic variations and implications for partial melting

Schilling, 1975, Azores mantel blob: rare-earth evidence, Earth Planet. Sci. Lett., 25, 103, 10.1016/0012-821X(75)90186-7 J.-G. Schilling, Geochemical and isotopic variation along the Mid-Atlantic Ridge axis from 79°N to 0°N, in: Decade of North American Geology, Synthesis Volume 1: Western Atlantic region (preprint). Schilling, 1983, Petrologic and geochemical variation along the mid-Atlantic Ridge from 29°N to 73°N, Am. J. Sci., 283, 510, 10.2475/ajs.283.6.510 Melson, 1979, Basaltic glass erupted along the mid-Atlantic Ridge between 0–37°N: relations between composition and latitude, 249 W.G. Melson and T. O'Hearn, Zero-age variations in the compositions of abyssal volcanic rocks along the axial zone of the mid-Atlantic Ridge, in: Decade of North American Geology, Synthesis Volume 1: Western North Atlantic region (preprint). Sigurdsson, 1981, First-order major element variation in basalt glasses from the mid-Atlantic Ridge: 29°N to 73°N, J. Geophys. Res., 86, 9483, 10.1029/JB086iB10p09483 Michael, 1983, Peridotites from DSDP Leg 82 and Oceanographer F.Z., Trans. Am. Geophys. Union, 64, 345 P.J. Michael and E. Bonatti, Petrology of ultramafic rocks from sites 556, 558 and 560, DSDP Leg 82 in the North Atlantic, in: Initial Reports of the Deep Sea Drilling Project 82 (in press). Dick, 1983, Contrasting abyssal basalt liquidus trends and regional variations in the compositions of abyssal peridotites, Trans. Am. Geophys. Union, 64, 310 Dick, 1984, Mineralogic studies of the residues of mantle melting: abyssal and Alpine-type peridotites, 295 Dick, 1984, Mineralogic variability of the uppermost mantle along mid-Ocean Ridges, Earth Planet. Sci. Lett., 69, 88, 10.1016/0012-821X(84)90076-1 Bender, 1984, Petrogenesis of basalt glasses from the Tamayo Region, East Pacific Rise, J. Petrol., 25, 213, 10.1093/petrology/25.1.213 Mysen, 1977, Compositional variation of co-existing phases with degree of melting of peridotite in the upper mantle, Am. Mineral., 62, 843 Jaques, 1980, Anhydrous melting of peridotite at 0–15 Kb pressure and the genesis of tholeiitic basalts, Contrib. Mineral. Petrol., 73, 283, 10.1007/BF00381447 Dick, 1977, Partial melting in the Josephine Peridotite, I. The effect on mineral composition and its consequence for geothermometry and geobarometry, Am. J. Sci., 277, 760, 10.2475/ajs.277.7.801 Ozawa, 1983, Evaluation of olivine-spinel geothermometry as an indicator for thermal history of peridotites, Contrib. Mineral. Petrol., 82, 52, 10.1007/BF00371175 Lehmann, 1983, Diffusion between olivine and spinel: application to geothermometry, Earth Planet. Sci. Lett., 64, 123, 10.1016/0012-821X(83)90057-2 Wilshire, 1975, Problems in determining mantle geotherms from pyroxene compositions of ultramafic rocks, J. Geol., 83, 313, 10.1086/628095 Eales, 1983, Al/Cr ratios of co-existing pyroxene and spinellids in some ultramafic rocks, Chem. Geol., 38, 57, 10.1016/0009-2541(83)90045-1 Elthon, 1984, Compositional changes in CrAl Spinel as a consequence of subsolidus equilibration in cumulate ultramafic and gabbroic rocks from the Bay of Islands ophiolite and elsewhere, Trans. Am. Geophys. Union, 65, 295 Hamlyn, 1980, Petrology of mantle-derived ultramafics from the Owen Fracture Zone, northwest Indian Ocean: implications for the nature of the oceanic upper mantle, Earth Planet. Sci. Lett., 48, 65, 10.1016/0012-821X(80)90171-5 Sinton, 1979, Petrology of (alpine-type) peridotites from site 395, DSDP Leg 45, 45, 595 Hodges, 1976, DSDP Site 334: Magmatic cumulates from Oceanic Layer 3, J. Geophys. Res., 81, 4135, 10.1029/JB081i023p04135 Jarosewich, 1980, Reference samples for electron microprobe analysis, Geostandards Newsl., 4, 43, 10.1111/j.1751-908X.1980.tb00273.x Bence, 1968, Empirical correction factors for the electron microanalysis of silicates and oxides, J. Geol., 76, 382, 10.1086/627339 Prinz, 1976, Ultramafic and mafic dredge samples from the equatorial mid-Atlantic ridge and fracture zones, J. Geophys. Res., 81, 4087, 10.1029/JB081i023p04087 Searle, 1976, Lithospheric structure of the Azores plateau from Rayleigh-Wave dispersion, R. Astron. Soc. Geophys. J., 44, 537, 10.1111/j.1365-246X.1976.tb00291.x Hofmann, 1982, Mantle plumes from ancient oceanic crust, Earth Planet. Sci. Lett., 57, 421, 10.1016/0012-821X(82)90161-3 LeDouran, 1981, Axial depth anomalies from 10° to 50° North along the mid-Atlantic Ridge: Correlation with other mantle properties, Earth Planet. Sci. Lett., 54, 29, 10.1016/0012-821X(81)90066-2 Sclater, 1975, Comparison of long wavelength residual elevation and free air gravity anomalies in the North Atlantic and possible implications for the thickness of the lithospheric plate, J. Geophys. Res., 80, 1031, 10.1029/JB080i008p01031 Langmuir, 1980, An evaluation of major element heterogeneity in the mantle sources of basalts, Philos. Trans. R. Soc. London, Ser. A, 297, 383, 10.1098/rsta.1980.0223 Gast, 1968, Trace element fractionation and the origin of tholeiitic and alkaline magma types, Geochim. Cosmochim. Acta, 32, 1057, 10.1016/0016-7037(68)90108-7 Neumann, 1984, Petrology of basalts from the Mohns-Knipowich Ridge; the Norwegian-Greenland Sea, Contrib. Mineral. Petrol., 85, 209, 10.1007/BF00378101 Langmuir, 1977, Petrogenesis of basalts from the FAMOUS area: Mid-Atlantic Ridge, Earth Planet. Sci. Lett., 36, 133, 10.1016/0012-821X(77)90194-7 Miyashiro, 1969, Composition and origin of serpentinites from the mid-Atlantic Ridge near 24° and 30° north latitude, Contrib. Mineral. Petrol., 23, 117, 10.1007/BF00375173 Tiezzi, 1980, Crystal fractionation in a cumulate gabbro, Mid-Atlantic Ridge, 26°N, J. Geophys. Res., 85, 5438, 10.1029/JB085iB10p05438 Arai, 1979, Petrology of ultramafic rocks from site 395, 45, 587 Boudier, 1979, Microstructural study of three peridotite samples drilled at the western margin of the mid-Atlantic Ridge, 45, 603 Melson, 1971, Petrology of a transform zone and adjacent ridge segments, Philos. Trans. R. Soc. London, 268, 423, 10.1098/rsta.1971.0005 Thompson, 1972, The petrology of oceanic crust across fracture zones in the Atlantic Ocean: evidence of a new kind of sea floor spreading, J. Geol., 80, 526, 10.1086/627779 Bonatti, 1976, Sections of the Earth's crust in the equatorial Atlantic, J. Geophys. Res., 81, 4104, 10.1029/JB081i023p04104 Bonatti, 1975, Meta gabbros from the mid-Atlantic Ridge at 06°N: contact-hydrothermal-dynamic metamorphism beneath the axial valley, J. Geol., 83, 61, 10.1086/628045 Perry, 1981, North Atlantic Ocean: Bathymetry and Plate tectonic evolution, Geol. Soc. Am.