 | Akizawa, Norikatsu, Früh-Green, Gretchen L., Tamura, Akihiro, Tamura, Chiori, Morishita, Tomoaki (2020) Compositional heterogeneity and melt transport in mantle beneath Mid-Atlantic Ridge constrained by peridotite, dunite, and wehrlite from Atlantis Massif. Lithos, 354. 105364 doi:10.1016/j.lithos.2019.105364 | Journal (article/letter/editorial) | | beneath Mid-Atlantic Ridge constrained by peridotite, dunite, and wehrlite from Atlantis Massif Norikatsu...beneath Mid-Atlantic Ridge constrained by peridotite, dunite, and wehrlite from Atlantis Massif, LITHOS(2019)...beneath Mid-Atlantic Ridge constrained by peridotite, dunite, and wehrlite from Atlantis Massif Norikatsu...Chiori Tamura1 , and Tomoaki 3 Atmosphere and Ocean Research Institute, The University of Tokyo; akizawa@aori... and wehrlitic rocks drilled at Atlantis Massif (Mid-Atlantic Ridge), 1 Journal Pre-proof where mantle-derived |  | | Journal (article/letter/editorial) | | geochemistry of peridotites from IODP Site U1309 at Atlantis Massif, MAR 30°N: micro- and macro-scale melt penetrations...recovered from IODP Site U1309 at the Atlantis Massif in the Mid-Atlantic Ridge were examined to understand magmatic...magmatic processes for the oceanic core complex formation. Original peridotite was fragmented, and the...various petrographical and geochemical features. A spinel harzburgite in contact with gabbro shows evidence...peridotite is one of the components of the oceanic core complex. Some of plagioclase-bearing peridotites, on the |  | | Journal (article/letter/editorial) | | The Godzilla Megamullion is a giant oceanic core complex located in an extinct slow-spreading segment of...crystallization of new plagioclase and diopside by a mid-ocean ridge basalt (MORB)-like melt, producing a high-Mg...this. Olivine gabbros from the 1508 m Hole 735B Atlantis Bank gabbro section have low nickel contents,...whereas those from the 1400 m Hole U1309D Atlantis Massif gabbro section have high nickel. This is consistent...that formed the Godzilla troctolites occur beneath ocean ridges across the spreading rate spectrum. KEY |  | | Journal (article/letter/editorial) | | at Southwest Indian Ridge (Dick et al. 2000) and Hole U1309D at Mid-Atlantic Ridge (Blackman et al. 2006)...remnants of an embryonic (ultra-)slow-spreading ocean called Ligurian-Piedmontese basin (Lagabrielle and...Hole 735B at Southwest Indian Ridge and the Hole U1309D at Mid-Atlantic Ridge. We discuss the petrogenetic...sequence. The mantle peridotites are plagioclase and spinel bearing and locally retain a NE-deeping 123 708...mol% and *0.27 wt%, Fig. 3). Clinopyroxene and spinel occur as accessories. The clinopyroxene is essentially |  | | Journal (article/letter/editorial) | | 1007/s00410-014-0974-x ORIGINAL PAPER Geochemistry of spinel-hosted amphibole inclusions in abyssal peridotite:...Springer-Verlag Berlin Heidelberg 2014 Abstract Spinel-hosted hydrous silicate mineral inclusions are...study, we report geochemical variations of the spinel-hosted pargasite inclusions in reacted harzburgite...troctolite collected from Atlantis Massif, an oceanic core complex, in the Mid-Atlantic Ridge. The studied samples...depleted residual harzburgite beneath the mid-ocean ridge spreading center. The trace-element compositions |  | | Journal (article/letter/editorial) | | the oceanic core complex: role of melt on mantle heterogeneity beneath midocean ridge 田村 森下 明弘(Akihiro...partial melting and melt extracted beneath midocean ridge, and is contributed to understanding of magmatism...Peridotite samples from the oceanic core complex of the ridgetransform intersection corner high recently...Compiling data of Cr# [Cr/(Cr＋Al) atomic ratio] of spinel and clinopyroxene REE compositions of abyssal peridotite...peridotite from the slowand ultraslowspreading midocean ridges, accumulated since 1980s, demonstrate that |  | | Journal (article/letter/editorial) | | peridotites from the Godzilla Megamullion Oceanic Core Complex, Parece Vela Basin, Philippine Sea Matthew Loocke...September 2013 Keywords: Spinel Plagioclase peridotite Oceanic Core Complex Backarc basin Philippine...is the largest known example of an Oceanic Core Complex (OCC). Peridotites recovered from the megamullion...percentage of plagioclase peridotites and average spinel Cr# of 0.35. The medial, fertile portion of the...falloff in melt productivity represented by fertile spinel compositions (i.e. Cr# b0.25) and the presence |  | | Journal (article/letter/editorial) | | Hydrothermal Systems in Peridotites of Slow-Spreading Mid-Oceanic Ridges. Modeling Phase Transitions and Material...thermodynamic modulus of the model is based on the GEOCHEQ complex, which makes it possible to simulate equilibria...ridges, which consist only of mantle peridotites (spinel harzburgites). The results of our simulations demonstrate...areas of the oceanic basement in the basins of the Atlantic, Indian, and Arctic oceans. Oceanic slow-spreading...R/V Atlantis (United States) in the intersection area of the Mid-Atlantic Ridge (MAR) and Atlantis Fracture |  | | Journal (article/letter/editorial) | | embayed morphology of olivine (Fo ¼ 87^ 88 mol %) and spinel from the olivine-rich troctolites, together with...their formation through reaction between an olivine^spinel matrix and an infiltrating melt.This interpretation...host olivine-rich troctolites and centimetre-scale spinel-bearing dunitic clots, which are interpreted as...melts were chemically similar to mid-ocean ridge basalt (MORB). Spinel from the olivine-rich troctolites...made up of olivine and minor inclusion-bearing spinel. This matrix was subsequently impregnated by MORB-type |  | Drouin, Marion, Godard, Marguerite, Ildefonse, Benoit, Bruguier, Olivier, Garrido, Carlos J. (2009) Geochemical and petrographic evidence for magmatic impregnation in the oceanic lithosphere at Atlantis Massif, Mid-Atlantic Ridge (IODP Hole U1309D, 30°N) Chemical Geology, 264 (1) 71-88 doi:10.1016/j.chemgeo.2009.02.013 | Journal (article/letter/editorial) | | impregnation in the oceanic lithosphere at Atlantis Massif, Mid-Atlantic Ridge (IODP Hole U1309D, 30°N) Marion Drouin...Troctolite LA-ICP-MS Olivine Integrated Ocean Drilling Program Mid-ocean ridge Impregnated mantle a b s t r a...a c t IODP Hole U1309D (Atlantis Massif, Mid-Atlantic Ridge 30°N) is the second deepest hole drilled...most primitive gabbroic rocks ever drilled at mid-ocean ridges. We present the result of an in situ trace...crystallized (impregnation). These observations suggest a complex crystallization history in an open system involving |  | Delacour, Adélie, Früh-Green, Gretchen L., Frank, Martin, Gutjahr, Marcus, Kelley, Deborah S. (2008) Sr- and Nd-isotope geochemistry of the Atlantis Massif (30°N, MAR): Implications for fluid fluxes and lithospheric heterogeneity. Chemical Geology, 254 (1) 19-35 doi:10.1016/j.chemgeo.2008.05.018 | Journal (article/letter/editorial) | | o Sr- and Nd-isotope geochemistry of the Atlantis Massif (30°N, MAR): Implications for fluid fluxes and...Serpentinites Atlantis Massif Lost City A B S T R A C T The Atlantis Massif (Mid-Atlantic Ridge, 30°N) is...is an oceanic core complex marked by distinct variations in crustal architecture, deformation and metamorphism...recovered by submersible from the southern ridge of the massif that underlie the peridotite-hosted Lost...interaction during uplift and emplacement of the massif and hydrothermal activity associated with the formation |  | Tamura, Akihiro, Morishita, Tomoaki, Ishimaru, Satoko, Hara, Kaori, Sanfilippo, Alessio, Arai, Shoji (2016) Compositional variations in spinel-hosted pargasite inclusions in the olivine-rich rock from the oceanic crust–mantle boundary zone. Contributions to Mineralogy and Petrology, 171 (5) doi:10.1007/s00410-016-1245-9 | Journal (article/letter/editorial) | | 9 ORIGINAL PAPER Compositional variations in spinel‑hosted pargasite inclusions in the olivine‑rich...variations in spinel-hosted hydrous silicate mineral inclusions in rock samples from the ocean floor near...near a mid-ocean ridge and trench. Pargasite is the dominant mineral among the inclusions, and all of them...exceptionally rich in incompatible elements. The host spinel grains are considered to be products of melt–peridotite...the reaction that produced the inclusionhosting spinel, the compositional differences between Communicated |  | Schwarzenbach, Esther M., Früh-Green, Gretchen L., Bernasconi, Stefano M., Alt, Jeffrey C., Shanks III, Wayne C., Gaggero, Laura, Crispini, Laura (2012) Sulfur geochemistry of peridotite-hosted hydrothermal systems: Comparing the Ligurian ophiolites with oceanic serpentinites. Geochimica et Cosmochimica Acta, 91. 283-305 doi:10.1016/j.gca.2012.05.021 | Journal (article/letter/editorial) | | Margin formed during the opening of the North Atlantic, and with serpentinites sampled at the active...City hydrothermal field on the Atlantis Massif near the Mid-Atlantic Ridge. The sulfide and oxide mineral...Iberian Margin and the southern wall of the Atlantis Massif, and generally represents the late stages of...serpentinization and tectonic activity along a mid-ocean ridge. Additionally, local enrichment in 34S in sulfides...observations along detachment fault surfaces at the Atlantis Massif. Our results, therefore, give further evidence |  | | Journal (article/letter/editorial) | | geochemistry of serpentinites and gabbros of the Atlantis Massif (IODP Site U1309) Adélie Delacour a,*,1, Gretchen...crust at the central dome of the Atlantis Massif (Mid-Atlantic Ridge, 30°N) were drilled during Expeditions...Expeditions 304 and 305 of the Integrated Ocean Drilling Program (IODP) and a 1.4 km section of predominantly...basement rocks of the southern wall of the Atlantis Massif, which hosts the Lost City Hydrothermal Field... All rights reserved. 1. INTRODUCTION In mid-ocean ridge environments, interaction of seawater with |  | Morishita, Tomoaki, Dilek, Yildirim, Shallo, Minella, Tamura, Akihiro, Arai, Shoji (2011) Insight into the uppermost mantle section of a maturing arc: The Eastern Mirdita ophiolite, Albania. Lithos, 124 (3) 215-226 doi:10.1016/j.lithos.2010.10.003 | Journal (article/letter/editorial) | | Harzburgite–dunite–orthopyroxenite Island arc Mid-ocean ridge a b s t r a c t We examined peridotite massifs...similar to those in abyssal peridotites from mid-ocean ridge systems. Harzburgites have more depleted major...LREE-enriched fluids/melts. Based on olivine and spinel chemistries, dunites are classified into two types:...(= Cr/(Cr + Al) atomic ratio) spinel-bearing dunite and medium-Cr# spinel-bearing dunite. Orthopyroxenites...of the dunite. Refractory harzburgite, high-Cr# spinel-bearing dunite, and orthopyroxenite may have a |  | | Journal (article/letter/editorial) | | Field at the southern face of the Atlantis Massif (Mid-Atlantic Ridge, 30°N) were examined to better understand...sites located between 10° and 40°N along the Mid-Atlantic Ridge (MAR), Rainbow, Logatchev, Ashadze, Lost...aging processes and global geochemical fluxes in ridge and subduction zone environments. In addition, the...communities in near-vent environments away from volcanic ridge centers and has important implications for the existence...cooling of mantle and gabbroic rocks within the massif produce Ca-rich, high pH (9–11) fluids with elevated |  | Godard, M., Awaji, S., Hansen, H., Hellebrand, E., Brunelli, D., Johnson, K., Yamasaki, T., Maeda, J., Abratis, M., Christie, D., Kato, Y., Mariet, C., Rosner, M. (2009) Geochemistry of a long in-situ section of intrusive slow-spread oceanic lithosphere: Results from IODP Site U1309 (Atlantis Massif, 30°N Mid-Atlantic-Ridge) Earth and Planetary Science Letters, 279 (1) 110-122 doi:10.1016/j.epsl.2008.12.034 | Journal (article/letter/editorial) | | Results from IODP Site U1309 (Atlantis Massif, 30°N Mid-Atlantic-Ridge) M. Godard a,⁎, S. Awaji b, H...January 2009 Editor: R.W. Carlson Keywords: Mid-Atlantic Ridge oceanic gabbro bulk-hole composition geochemistry...was drilled at Atlantis Massif, an oceanic core complex, at 30°N on the Mid-Atlantic Ridge (MAR). We present...activity is associated with the formation of Atlantis Massif. Our results suggest that almost all melts...most common modern ridge system (about half of the ∼67,000 km long volcanic ridge system (Solomon, 1989; |  | | Journal (article/letter/editorial) | | during serpentinization and metasomatism at the Atlantis Massif (MAR 30°N): Insights from B and Sr isotope...hydrothermal system at the southern Atlantis Massif (Mid-Atlantic Ridge, 30°N) provides a natural laboratory...during formation and emplacement of an oceanic core complex. Here we present B, O, and Sr isotope data to investigate...exhumation of lithospheric sequences within the Atlantis Massif. Our data indicate that extensive serpentinization...insignificant for boron geochemistry of the Atlantis Massif serpentinites. Talc- and amphibole-rich fault |  | Ciazela, Jakub, Koepke, Juergen, Dick, Henry J.B., Botcharnikov, Roman, Muszynski, Andrzej, Lazarov, Marina, Schuth, Stephan, Pieterek, Bartosz, Kuhn, Thomas (2018) Sulfide enrichment at an oceanic crust-mantle transition zone: Kane Megamullion (23°N, MAR) Geochimica et Cosmochimica Acta, 230. 155-189 doi:10.1016/j.gca.2018.03.027 | Journal (article/letter/editorial) | | Kane Megamullion oceanic core complex located along the Mid-Atlantic Ridge (23°30’N, 45°20’W) exposes lower...lower crust and upper mantle directly on the ocean floor. We studied chalcophile elements and sulfides...the spinel harzburgites of the mantle beneath. Whereas the range of Cu concentrations in spinel harzburgites...been formed may be unclear due to the ophiolites’ complex history. Subduction-related processes with an additional...crust-mantle transition zones are exposed on the ocean floor. Although a typical thickness of the fast-spreading |  | Ferrando, Carlotta, Lynn, Kendra J., Basch, Valentin, Ildefonse, Benoit, Godard, Marguerite (2020) Retrieving timescales of oceanic crustal evolution at Oceanic Core Complexes: Insights from diffusion modelling of geochemical profiles in olivine. Lithos, 376. 105727pp. doi:10.1016/j.lithos.2020.105727 | Journal (article/letter/editorial) | | Oceanic Core Complexes (OCC) has been described as a complex process involving multiple intrusions of magma... The migration of primitive magmas (i.e., Mid Ocean Ridge Basalts, MORBs) can lead to melt-rock interactions...sequence sampled in IODP Hole U1309D (Atlantis Massif OCC, Mid-Atlantic Ridge 30°N). Olivine-rich troctolites...formation of slow-spreading oceanic crust at the Atlantis Massif OCC. Olivines in olivine-rich troctolites represent...cooling rates (850°C-250°C) estimated at the Atlantis Massif OCC. The minimum timescales from 3D models |  | Delacour, Adélie, Früh-Green, Gretchen L., Bernasconi, Stefano M., Schaeffer, Philippe, Kelley, Deborah S. (2008) Carbon geochemistry of serpentinites in the Lost City Hydrothermal System (30°N, MAR) Geochimica et Cosmochimica Acta, 72 (15) 3681-3702 doi:10.1016/j.gca.2008.04.039 | Journal (article/letter/editorial) | | 1309D at the central dome of the Atlantis Massif (Mid-Atlantic Ridge, 30°N) was examined to characterize...serpentinization. The basement rocks of the Atlantis Massif are characterized by total carbon (TC) contents...seawater fluxes in the southern part of the Atlantis Massif likely favor the transport and incorporation...circulation deep into the gabbroic core of the massif. Thus, our study indicates that hydrocarbons account...proportion of the total carbon stored in the Atlantis Massif basement and suggests that serpentinites may |  | | Journal (article/letter/editorial) | | peridotites exhumed on the southern wall of the Atlantis Massif (IODP Expedition 357) Stéphane Rouméjon1*...Zürich, Switzerland 2 Bigelow Laboratory for Ocean Sciences, East Boothbay, ME, 04544, USA 3 http://www...southern wall of the Atlantis Massif (Mid-Atlantic Ridge, 30°N) during International Ocean Discovery Program...development of alteration heterogeneities at the Atlantis Massif. Textural sequences and mineralogical assemblages...seafloor. Key words: Atlantis Massif; fluid-rock interaction; International Ocean Discovery Program (IODP); |  | | Journal (article/letter/editorial) | | ultraslow-spreading ridges undergo variable and complex serpentinization. Here, we present in-situ oxygen...identified in samples drilled at the Atlantis SC RI P Massif (Mid-Atlantic ridge, MAR, 30°N) and dredged along...along the easternmost Southwest Indian ridge (SWIR, 62-65°E). The textural sequence is similar at both locations...appears faster AC and more heterogeneous in Atlantis Massif samples than in SWIR samples. We propose that...source for observed Si-enrichments in some Atlantis Massif samples and control the pH, which in turn influences |  | Sanfilippo, Alessio, Morishita, Tomoaki, Kumagai, Hidenori, Nakamura, Kentaro, Okino, Kyoko, Hara, Kaori, Tamura, Akihiro, Arai, Shoji (2015) Hybrid troctolites from mid-ocean ridges: inherited mantle in the lower crust. Lithos, 232. 124-130 doi:10.1016/j.lithos.2015.06.025 | Journal (article/letter/editorial) | | Hybrid troctolites from Mid-Ocean Ridges: Inherited mantle in the lower crust Alessio...Akihiro, Arai, Shoji, Hybrid troctolites from Mid-Ocean Ridges: Inherited mantle in the lower crust, LITHOS... ACCEPTED MANUSCRIPT Hybrid troctolites from Mid-Ocean Ridges: inherited mantle in the lower crust PT...troctolites recently sampled at the Central Indian Ridge. The occurrence of a large orthopyroxene of a probable...in nearly all the plutonic sample suites from mid-ocean ridges (e.g. Elthon 1987; Dick and Natland, 1996; |  | | Journal (article/letter/editorial) | | and Schmincke, 2012) contain relatively common spinel-facies peridotite (mainly harzburgite) xenoliths...ridges, for instance, Southwest Indian Ridge (SWIR) and Gakkel Ridge (e.g., ED Cannat et al., 2009, Sauter...xenolith suite consists of about 65% peridotites (spinel-harzburgite and rare lherzolite), about 20% pyroxenites...VT999 peridotite samples consist of four-phase spinel-facies harzburgites, exhibiting a porphyroclastic...the other primary minerals. Irregular brownish spinel grains are always intergrown with pyroxenes. The |
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