 | | Journal (article/letter/editorial) | | obtained from the Iberia Abyssal Plain and from the Gorringe Bank, combined with those already known on the...zones were sampled along East-West transects of the ocean-continent transition, immediately West or at the...exposed at both the Iberia Abyssal Plain and the Gorringe Bank are clearly different. The presence of plagioclase-bearing...lower pressures ( _<0.6 GPa) registered in the Gorringe Bank gabbroic rocks and in some reexamined gabbros...Plain, transitional and depleted tholeiites at the Gorringe Bank. The trace elements and the isotope data |  | | Journal (article/letter/editorial) | | magmatism prior to continental break-up in the North Atlantic and geodynamic implications Urs Scha«rer a; *...the Galicia and Gorringe banks and in the Iberia Abyssal Plain of the North Atlantic, unroofed subcontinental...determined on the same grains. For Mt. Gettysburg at Gorringe, gabbro emplacement ages of 137.5 þ 0.5 (2c) Ma...mantle domains. Gabbro zircons from Mt. Ormonde at Gorringe yield a much younger age of 77.1 þ 0.4 Ma...LILE-depleted than those sampled by the about 20 Myr older Gorringe gabbros. The data demonstrate that magmatism occurring |  | | Journal (article/letter/editorial) | | evolution of the Madeira hotspot (eastern North Atlantic): recycling of Paleozoic (9 500 Ma) oceanic lithosphere...(eastern North Atlantic) and seamounts of the Madeira hotspot track (Ampe©re, Coral Patch and Ormonde) are presented...isotopic ratios are similar to those in normal mid ocean ridge basalt, the incompatible element signatures and...basaltic) and lower (primarily unaltered gabbroic) ocean crust and lithospheric mantle. The more fertile...to the surface at mid ocean ridges or hotspots (mantle plumes) which form ocean island volcanoes [1,2] |  | | Journal (article/letter/editorial) | | principally from the vein assemblage, from which phlogopite gives rise to the variable Sr isotopes, and baddeleyite...commonly carry phenocrysts of Mg-olivine, Ti-phlogopite, Ti-augite and rarely richterite. The groundmass...displaying preferred orientation due to magma flow, phlogopite 293 Ž7–10 vol.%. represented by small interstitial...composition, its low modal amounts of nepheline and phlogopite, and the small size of the groundmass grains...poikilitically including smaller melilite grains. Phlogopite Ž7–10 vol.%. is developed as small interstitial |  | Sagan, Madisen, Heaman, Larry M., Pearson, D. Graham, Luo, Yan, Stern, Richard A. (2020) Removal of continental lithosphere beneath the Canary archipelago revealed from a U Pb Age and Hf/O isotope study of modern sand detrital zircons. Lithos, 362. 105448 doi:10.1016/j.lithos.2020.105448 | Journal (article/letter/editorial) | | Triassic-Jurassic rifting and opening of the Central Atlantic Jo Ocean. Importantly, this detrital zircon study...complete time-integrated record of a long-lived ocean island’s geological history is preserved in modern...Unravelling the origin and complete growth history of an ocean island is challenging because often many of the...at depth or has been removed by erosion. Typical ocean island erosion rates vary between 1-10 cm/ky (Dóniz-Páez...2011), therefore a significant volume of long-lived ocean islands is missing. For example, Fuerteventura, |  | CIGOLINI, Corrado, DI MARTINO, Mario, LAIOLO, Marco, COPPOLA, Diego, ROSSETTI, Piergiorgio, MORELLI, Marco (2012) Endogenous and nonimpact origin of the Arkenu circular structures (al‐Kufrah basin—SE Libya) Meteoritics & Planetary Science, 47 (11) 1772-1788 doi:10.1111/maps.12012 | Journal (article/letter/editorial) | | isotope and trace element signature typical of ocean island basalts (e.g., Black and Liégeois 1993)...phenocrysts of aegirine, and laths of subhedral phlogopite in a microfelsitic matrix of the same phases...microphenocryts of nepheline, and late poikiolitic phlogopite (which locally overgrows iddingsitic alteration...Harris et al. 1999), Monchique Complex and Mount Ormonde (Bernard-Griffiths et al. 1997; Grange et al...(REE) evidence from Serra de Monchique and Mount Ormonde complexes. Journal of Petrology 38:115–132. |  | | Journal (article/letter/editorial) | | lithosphere may be related to the arrival of the Central Atlantic Plume head beneath Western Europe about 70 Ma...“Central Atlantic Plume” on the European continent related to the opening of the Atlantic Ocean (Piromallo... Has it been modified by the opening of the Atlantic Ocean and the 204 J.-M. Dautria et al. / Lithos...a basanite containing very large (up to 3 cm) phlogopite megacrysts (recently dated at 1.88 ± 0.02 Ma...K-rich and Th-, U-, Nb-, and LREE-poor phase like phlogopite. Slight negative anomalies in Th and U (e.g. |  | | Book | | McCLAIN, J. S. & BURNETT, M. Evo lu tion or Lhe ocean crust: resu lts from recent seisn1ic experin1ents... FISK, M. R. Depths and temperatures of mid-ocean-ridge magma chambers and the composition of their source...FLOWER, M. F. J. Spreading-rate paran1eters in ocean crust: analogue for ophiolite? .......... . SMEWl:---JG...GREGORY, R. T. Melt percolation beneath a spreading ridge: evidence from the Sen1ail peridotite, On1an .....WHITE, R . S . Atlantic ocean ic crust: seismic structure of a slow-spreadi ng ridge .......... .... |
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