Search Results - "Dick, H. J. B"

Recycled arc mantle recovered from the Mid-Atlantic Ridge by Urann, B. M., Dick, H. J. B., Parnell-Turner, R., Casey, J. F.

“…Plate tectonics and mantle dynamics necessitate mantle recycling throughout Earth’s history, yet direct geochemical evidence for mantle reprocessing remains…”
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An assessment of upper mantle heterogeneity based on abyssal peridotite isotopic compositions by Warren, J. M., Shimizu, N., Sakaguchi, C., Dick, H. J. B., Nakamura, E.

“…Abyssal peridotites, the depleted solid residues of ocean ridge melting, are the most direct samples available to assess upper oceanic mantle composition. We…”
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Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean by Michael, P. J, Langmuir, C. H, Dick, H. J. B, Snow, J. E, Goldstein, S. L, Graham, D. W, Lehnert, K, Kurras, G, Jokat, W, Mühe, R, Edmonds, H. N

“…A high-resolution mapping and sampling study of the Gakkel ridge was accomplished during an international ice-breaker expedition to the high Arctic and North…”
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Discovery of abundant hydrothermal venting on the ultraslow-spreading Gakkel ridge in the Arctic Ocean by Edmonds, H. N, Michael, P. J, Baker, E. T, Connelly, D. P, Snow, J. E, Langmuir, C. H, Dick, H. J. B, Mühe, R, German, C. R, Graham, D. W

“…Submarine hydrothermal venting along mid-ocean ridges is an important contributor to ridge thermal structure, and the global distribution of such vents has…”
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Pervasive melt percolation reactions in ultra-depleted refractory harzburgites at the Mid-Atlantic Ridge, 15° 20′N: ODP Hole 1274A by Seyler, Monique, Lorand, J. -P., Dick, H. J. B., Drouin, M.

“…ODP Leg 209 Site 1274 mantle peridotites are highly refractory in terms of lack of residual clinopyroxene, olivine Mg# (up to 0.92) and spinel Cr#…”
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Tracking flux melting and melt percolation in supra-subduction peridotites (Josephine ophiolite, USA) by Le Roux, V., Dick, H. J. B., Shimizu, N.

“…Here, we investigate the scale and nature of melting and melt percolation processes recorded by 17 supra-subduction peridotites collected in a ~70 km 2 area in…”
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Dynamic Accretion Beneath a Slow‐Spreading Ridge Segment: IODP Hole 1473A and the Atlantis Bank Oceanic Core Complex by Dick, H. J. B., MacLeod, C. J., Blum, P., Abe, N., Blackman, D. K., Bowles, J. A., Cheadle, M. J., Cho, K., Ciazela, J., Deans, J. R., Edgcomb, V. P., Ferrando, C., France, L., Ghosh, B., Ildefonse, B., John, B., Kendrick, M. A., Koepke, J., Leong, J. A. M., Liu, C., Ma, Q., Morishita, T., Morris, A., Natland, J. H., Nozaka, T., Pluemper, O., Sanfilippo, A., Sylvan, J. B., Tivey, M. A., Tribuzio, R., Viegas, G.

“…809 deep IODP Hole U1473A at Atlantis Bank, SWIR, is 2.2 km from 1,508‐m Hole 735B and 1.4 from 158‐m Hole 1105A. With mapping, it provides the first 3‐D view…”
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Pyroxenites from the Southwest Indian Ridge, 9-16°E: Cumulates from Incremental Melt Fractions Produced at the Top of a Cold Melting Regime by Dantas, C., Ceuleneer, G., Gregoire, M., Python, M., Freydier, R., Warren, J., Dick, H. J. B.

“…The Southwest Indian Ridge (SWIR) at 9-16°E and 52-53°S is characterized by ultra-slow, oblique spreading and contains one of the few documented occurrences of…”
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Melt-Rock Reaction in the Mantle: Mantle Troctolites from the Parece Vela Ancient Back-Arc Spreading Center by Sanfilippo, A., Dick, H. J. B., Ohara, Y.

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Mantle Melting, Melt Transport, and Delivery Beneath a Slow-Spreading Ridge: The Paleo-MAR from 23 15'N to 23 45'N by Dick, H. J. B., Lissenberg, C. J., Warren, J. M.

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Tectonics of ridge-transform intersections at the Kane fracture zone by KARSON, J. A, DICK, H. J. B

“…The Kane Transform offsets spreading-center segments of the Mid-Atlantic Ridge by about 150 km at 24 degree N latitude. Observations document the asymmetric…”
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High temperature alteration of Abyssal ultramafics from the Islas Orcadas Fracture Zone, South Atlantic by KIMBALL, K. L, SPEAR, F. C, DICK, H. J. B

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Paired melt lenses at the East Pacific Rise and the pattern of melt flow through the gabbroic layer at a fast-spreading ridge by Natland, James H., Dick, Henry J.B.

“…From geophysics, two thin and narrow sill-like melt lenses occur directly beneath the ridge axis on the East Pacific Rise (EPR) near 9°N. One is at the base of…”
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Off-ridge volcanism and seafloor spreading in the Shikoku Basin by KLEIN, G. DEV, KOBAYASHI, K, CHAMLEY, H, CURTIS, D. M, DICK, H. J. B, ECHOLS, D. J, FOUNTAIN, D. M, KINOSHITA, H, MARSH, N. G, MIZUNO, A, NISTERENKO, G. V, OKADA, H, SLOAN, J. R, WAPLES, D. M, WHITE, S. M

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A review of melt migration processes in the adiabatically upwelling mantle beneath oceanic spreading ridges by Kelemen, P. B., Hirth, G., Shimizu, N., Spiegelman, M., Dick, H. J.

“…Th excess constraints (…”
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Is mid-ocean ridge basalt chemistry a function of melt-rock reaction in the lower oceanic crust? by Lissenberg, C.J., Dick, H.J.B., Mével, C.

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Formation of harzburgite by pervasive melt/rock reaction in the upper mantle by Kelemen, Peter B, Dick, Henry J. B, Quick, James E

“…Many mantle peridotite samples are too rich in Si02 (in the form of orthopyroxene) and have ratios of light to heavy rare earth elements that are too high to…”
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The effects of melt extraction and melt-rock reaction on abyssal peridotite geochemistry by Shimizu, N., Warren, J.M., Dick, H.J.B.

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Mineralogy of the mid-ocean-ridge basalt source from neodymium isotopic composition of abyssal peridotites by Salters, V J, Dick, H J B

“…Inferring the melting process at mid-ocean ridges, and the physical conditions under which melting takes place, usually relies on the assumption of…”
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A combined basalt and peridotite perspective on 14 million years of melt generation at the Atlantis Bank segment of the Southwest Indian Ridge: evidence for temporal changes in mantle dynamics? by Coogan, L.A., Thompson, G.M., MacLeod, C.J., Dick, H.J.B., Edwards, S.J., Hosford Scheirer, A., Barry, T.L.

“…Little is known about temporal variations in melt generation and extraction at midocean ridges largely due to the paucity of sampling along flow lines. Here we…”
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