 | 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) | | at an oceanic crust-mantle transition zone: Kane Megamullion (23°N, MAR) Jakub Ciazela, Juergen Koepke...at an oceanic crust-mantle transition zone: Kane Megamullion (23°N, MAR), Geochimica et Cosmochimica Acta...at an oceanic crust-mantle transition zone: Kane Megamullion (23°N, MAR) Jakub Ciazela1,2,3*, Juergen Koepke1...ABSTRACT: The Kane Megamullion oceanic core complex located along the Mid-Atlantic Ridge (23°30’N, 45°20’W)...exposes lower crust and upper mantle directly on the ocean floor. We studied chalcophile elements and sulfides |  | | Journal (article/letter/editorial) | | crust and its implications for the genesis of mid-ocean ridge basalt C. Johan Lissenberg ⁎, Henry J.B. Dick... Jaupart Keywords: mid-ocean ridge basalt lower oceanic crust Mid-Atlantic Ridge melt–rock reaction geochemistry...gabbro massif exposed in the Kane Megamullion (23°N, Mid-Atlantic Ridge) contain abundant clinopyroxene...pressures. Kane clinopyroxenes, however, are dominantly oikocrysts that overgrow olivine and plagioclase, indicating...oikocrysts enclose resorbed plagioclase with lower anorthite contents than plagioclase in the host rock, and |  | | Journal (article/letter/editorial) | | stagnation in peridotites from the Godzilla Megamullion Oceanic Core Complex, Parece Vela Basin, Philippine Sea...September 2013 Keywords: Spinel Plagioclase peridotite Oceanic Core Complex Backarc basin Philippine Sea...Melt–rock reaction a b s t r a c t The Godzilla Megamullion, located in the Parece Vela Backarc Basin of...example of an Oceanic Core Complex (OCC). Peridotites recovered from the megamullion are divided petrographically...lherzolites), depleted (e.g. harzburgites), and plagioclase-bearing groups (Ohara et al., 2003a). A total |  | | Journal (article/letter/editorial) | | JANUARY 17, 2013 The Godzilla Megamullion is a giant oceanic core complex located in an extinct slow-spreading...the megamullion. The troctolites are subdivided into olivine (olivine 460 vol. %) and plagioclase (plagioclase460...with crystallization of new plagioclase and diopside by a mid-ocean ridge basalt (MORB)-like melt, producing...crystallization of olivine, diopside and new plagioclase owing to mixing the high-Mg melt residual to...melt^rock reaction account for a sharp decrease in plagioclase anorthite content with respect to diopside Mg# |  | | 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...size layering (Fig. 2a). They locally contain plagioclase-rich pegmatoid layers and, rarely, irregular...fabric is also shown by the local occurrence of plagioclase-rich pegmatoid lenses and microgabbro bodies |  | | Journal (article/letter/editorial) | | January 2016 Keywords: Abyssal peridotite Mid-ocean ridge Partial melting Melt–rock interaction Mantle...peridotites are ultramafic rocks collected from mid-ocean ridges that are the residues of adiabatic decompression...for N1200 samples from 53 localities on 6 major ridge systems. On the basis of composition and petrography...peridotite, (2) dunite, (3) gabbro-veined and/or plagioclase-bearing peridotite, (4) pyroxenite-veined peridotite...formed recently during melt transport beneath the ridge, though some pyroxenites may be derived from melting |  | Madrigal, Pilar, Gazel, Esteban, Denyer, Percy, Smith, Ian, Jicha, Brian, Flores, Kennet E., Coleman, Drew, Snow, Jonathan (2015) A melt-focusing zone in the lithospheric mantle preserved in the Santa Elena Ophiolite, Costa Rica. Lithos, 230. 189-205 doi:10.1016/j.lithos.2015.04.015 | Journal (article/letter/editorial) | | Melt-focusing zone Lithospheric mantle Oceanic core complex a b s t r a c t The Santa Elena Ophiolite in Costa...mantle conditions to ~ 10 Ma. Our findings suggest a complex interplay between oceanic basin and back-arc extension...Elena as an obducted fragment of an oceanic core complex (OCC). © 2015 Elsevier B.V. All rights reserved...al., 2001). At extensional environments like mid-ocean ridges (Fig. 1), basaltic melts separate ⁎ Corresponding...ascending melts coalesce and evolve beneath the ridge axis they erupt to produce new oceanic crust (O'Hara |  | Harigane, Yumiko, Okamoto, Atsushi, Morishita, Tomoaki, Snow, Jonathan E., Tamura, Akihiro, Yamashita, Hiroyuki, Michibayashi, Katsuyoshi, Ohara, Yasuhiko, Arai, Shoji (2019) Melt–fluid infiltration along detachment shear zones in oceanic core complexes: Insights from amphiboles in gabbro mylonites from the Godzilla Megamullion, Parece Vela Basin, the Philippine Sea. Lithos, 344. 217-231 doi:10.1016/j.lithos.2019.06.019 | Journal (article/letter/editorial) | | amphiboles in gabbro mylonites from the Godzilla Megamullion, Parece Vela Basin, the Philippine Sea Yumiko...amphiboles in gabbro mylonites from the Godzilla Megamullion, Parece Vela Basin, the Philippine Sea, LITHOS...amphiboles in gabbro mylonites from the Godzilla Megamullion, Parece Vela Basin, the Philippine Sea Yumiko...mylonites from the medial area of the Godzilla Megamullion along the Parece Vela Rift in the Philippine...the original minerals (i.e., clinopyroxene and plagioclase). One sample of gabbro mylonite (KH07-02-D18-1) |  | | Journal (article/letter/editorial) | | subhedral olivine with PT lobate contacts against plagioclase and clinopyroxene, often occurring as large poikiloblasts...large compositional variability (anorthite in plagioclase, TiO 2 in clinopyroxene) as a result of local...mineral co-variation trends (e.g. anorthite in plagioclase vs. olivine XMg) match those of some natural...oceanic crust. They have been documented in oceanic ridge environments (e.g. Lissemberg and Dick, 2008; Godard...concomitant crystallization of PT interstitial plagioclase and clinopyroxene is inferred to originate olivine-rich |  | | Journal (article/letter/editorial) | | oceanic core complex in backarc basin: New insights from the recent Godzilla Megamullion study 小原 泰彦(Yasuhiko...OHARA), The Godzilla Megamullion is the largest known oceanic core complex, located in the Parece Vela...exposed at comparable spreading rates on other mid-ocean ridge systems. The tectono-magmatic characteristics...on the high-density samplings on the Godzilla Megamullion, show the evidences that the basin became slow...the Godzilla Megamullion reveals that the estimated slip rate of the Godzilla Megamullion detachment fault |  | | 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...peridotite from the slowand ultraslowspreading midocean ridges, accumulated since 1980s, demonstrate that...are dominantly collected from the oceanic core complex and abyssal plane at shallower depth (＜2500 m below |  | | Journal (article/letter/editorial) | | interpretation is corroborated by the occurrence of plagioclase-rich veins that exhibit diffuse margins against...infiltrating melts were chemically similar to mid-ocean ridge basalt (MORB). Spinel from the olivine-rich...impregnated by MORB-type melts saturated in plagioclase þ clinopyroxene to produce the olivine-rich troctolites...of the Atlantis Massif oceanic core complex (Mid-Atlantic Ridge, 308N) found 22 olivine-rich troctolite...described for the gabbroic pluton of the Kane Megamullion (Mid-Atlantic Ridge, 238N), where ‘dunitic troctolites’occur |  | Manatschal, Gianreto, Sauter, Daniel, Karpoff, Anne Marie, Masini, Emmanuel, Mohn, Geoffroy, Lagabrielle, Yves (2011) The Chenaillet Ophiolite in the French/Italian Alps: An ancient analogue for an Oceanic Core Complex?. Lithos, 124 (3) 169-184 doi:10.1016/j.lithos.2010.10.017 | Journal (article/letter/editorial) | | Alps: An ancient analogue for an Oceanic Core Complex? Gianreto Manatschal a,⁎, Daniel Sauter a, Anne...the Franco–Italian Alps represents a well-exposed ocean-floor sequence that was only weakly overprinted by...Alpine nappe stack. Pillow lavas showing a Mid Ocean Ridge Basalt (MORB) signature overlie tectonically...cross cutting relationships we conclude that: 1) a complex relation between high- and low-temperature shear...account for more than half of the Earth's Mid-Ocean Ridge (MOR) system, the processes of crust formation |  | Aranovich, L. Ya., Zinger, T. F., Bortnikov, N. S., Sharkov, E. V., Antonov, A. V. (2013) Zircon in gabbroids from the axial zone of the Mid-Atlantic ridge, Markov Deep, 6° N: Correlation of geochemical features with petrogenetic processes. Petrology, 21 (1) 1-15 doi:10.1134/s0869591113010025 | Journal (article/letter/editorial) | | Zircon in Gabbroids from the Axial Zone of the MidAtlantic Ridge, Markov Deep, 6° N: Correlation of Geochemical...the Markov Deep area in the slowspreading MidAtlantic ridge. The rocks are rep resented by variably...with hydrothermal solution of variable acidity. A complex study of structural–morphological and geochemical...grains observed even within single sample reflect a complex evolution of host minerals and serve as a valuable...the Markov Deep) from the slowspreading MidAtlantic Ridge (MAR). The walls of the rift valley and its |  | | Journal (article/letter/editorial) | | remnants of a fossil slow-spreading ocean are exposed. Olivines from plagioclase-harzburgites and replacive dunites...melt-rock reaction processes occurring below an oceanic ridge (e.g. Drouin et al., 2009; Lissenberg et al., 2013)...conjunction with the opening of the Central Atlantic Ocean (Schettino and Turco, 2011; Vissers et al....early magmatic processes occurring under an oceanic ridge and the role of melt-rock reaction processes on...impregnation event and re-equilibration under plagioclase-facies conditions (Rampone et al., 1996, 1997) |  | | Journal (article/letter/editorial) | | lower oceanic crust (Hess Deep, equatorial Pacific Ocean) C. Johan Lissenberg a,n, Christopher J. MacLeod...a, Marguerite Godard b a b School of Earth and Ocean Sciences, Cardiff University, Park Place, Cardiff...Elliott Available online 7 December 2012 Mid-ocean ridge basalt (MORB) is the most abundant magma on...crustal rocks exposed in Hess Deep (equatorial Pacific Ocean) demonstrate that their evolution is instead controlled...coupled with a strong trace element depletion of plagioclase, olivine, and, to a lesser extent, clinopyroxene |  | Grimes, Craig B., John, Barbara E., Cheadle, Michael J., Mazdab, Frank K., Wooden, Joseph L., Swapp, Susan, Schwartz, Joshua J. (2009) On the occurrence, trace element geochemistry, and crystallization history of zircon from in situ ocean lithosphere. Contributions to Mineralogy and Petrology, 158 (6) 757-783 doi:10.1007/s00410-009-0409-2 | Journal (article/letter/editorial) | | crystallization history of zircon from in situ ocean lithosphere Craig B. Grimes Æ Barbara E. John Æ...characterize the textural and geochemical features of ocean crustal zircon recovered from plagiogranite, evolved...along present-day slow and ultraslow spreading mid-ocean ridges (MORs). The geochemistry of 267 zircon...recognized based on texture and geochemistry. Most ocean crustal zircons resemble young magmatic zircon from...recognized within plutonic intervals of in situ ocean crust formed over a range of spreading rates. Differentiated |  | | Journal (article/letter/editorial) | | domains that were previously occupied by magmatic plagioclase, and because spinel-bearing rocks characteristically...of knowledge, Expedition 345 of the Integrated Ocean Drilling Program (IODP) was designed to drill and...Wiggins et al. 1996; Gillis et al. 2014b). The Ocean Drilling Project (ODP) Leg 147 took advantage of...escarpment 3°N Pacific Plate Hess Deep intra-rift ridge yielded U–Pb ages from 1.27 to 1.42 Ma (Rioux et...depths along the southern slope of the intra-rift ridge at Hess Deep. The main target of this expedition |  | Sani, Camilla, Sanfilippo, Alessio, Ferrando, Carlotta, Peyve, Alexander A., Skolotonev, Sergey G., Muccini, Filippo, Zanetti, Alberto, Basch, Valentin, Palmiotto, Camilla, Bonatti, Enrico, Ligi, Marco (2020) Ultra-depleted melt refertilization of mantle peridotites in a large intra-transform domain (Doldrums Fracture Zone; 7–8°N, Mid Atlantic Ridge). Lithos, 374. 105698pp. doi:10.1016/j.lithos.2020.105698 | Journal (article/letter/editorial) | | intra-transform domain (Doldrums Fracture Zone; 7–8°N, Mid Atlantic Ridge) Camilla Sani, Alessio Sanfilippo, Carlotta...intra-transform domain (Doldrums Fracture Zone; 7–8°N, Mid Atlantic Ridge), LITHOS (2020), https://doi.org/10.1016/...intratransform domain (Doldrums Fracture Zone; 7-8ºN, Mid Atlantic Ridge) Camilla Sani1, Alessio Sanfilippo1,2*, Carlotta...Doldrums transform system offsets the Equatorial Mid Atlantic Ridge by ~630 km at 7-8º N. This transform system...peridotites were dredged along the transverse and median ridge of the transform, across the ro of western flank |  | Yi, Sang-Bong, Oh, Chang-Whan, Pak, Sang Joon, Kim, Jonguk, Moon, Jai-Woon (2014) Geochemistry and petrogenesis of mafic-ultramafic rocks from the Central Indian Ridge, latitude 8°–17° S: denudation of mantle harzburgites and gabbroic rocks and compositional variation of basalts. International Geology Review, 56 (14) 1691-1719 doi:10.1080/00206814.2014.955539 | Journal (article/letter/editorial) | | mafic-ultramafic rocks from the Central Indian Ridge, latitude 8°–17° S: denudation of mantle harzburgites...Resources Research Division, Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea...mafic-ultramafic rocks from the Central Indian Ridge, latitude 8°–17° S: denudation of mantle harzburgites...of mafic-ultramafic rocks from the Central Indian Ridge, latitude 8°–17° S: denudation of mantle harzburgites...Resources Research Division, Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea |  | Basch, Valentin, Rampone, Elisabetta, Crispini, Laura, Ferrando, Carlotta, Ildefonse, Benoit, Godard, Marguerite (2018) From mantle peridotites to hybrid troctolites: Textural and chemical evolution during melt-rock interaction history (Mt. Maggiore, Corsica, France) Lithos, 323. 4-23 doi:10.1016/j.lithos.2018.02.025 | Journal (article/letter/editorial) | | evolution from spinel lherzolite to plagioclase-bearing lithotypes (plagioclase RI peridotites, olivine-rich...in the spinel dunite. AC In the shallower plagioclase facies, the melts modified by reactive melt percolation...dissolution of olivine and crystallization of plagioclase and orthopyroxene in the peridotites. This impregnation... ACCEPTED MANUSCRIPT impregnation process. Olivine, plagioclase and clinopyroxene REE compositions analyzed in...et al., 2013; Dygert et al., 2016), whereas plagioclase-rich peridotites, PT E D ubiquitously found |  | 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) | | the oceanic lithosphere at Atlantis Massif, Mid-Atlantic Ridge (IODP Hole U1309D, 30°N) Marion Drouin a...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...included into large undeformed clinopyroxene and plagioclase poikiloblasts. In contrast, gabbros and troctolites |  | Renna, Maria Rosaria, Armandola, Sonia, Becker, Harry, Sanfilippo, Alessio, Tribuzio, Riccardo, Wang, Zaicong (2021) Fractionation of highly siderophile and chalcogen elements in the lower oceanic crust: Insights from the troctolites of the Alpine-Apennine Jurassic ophiolites. Lithos, 380. 105873pp. doi:10.1016/j.lithos.2020.105873 | Journal (article/letter/editorial) | | elements-depleted melts that reacted with an olivine + plagioclase crystal mush to form the leucotroctolites. Alternatively...on the influence of sulfide saturation in mid-ocean ridge basalts on chalcophile ro of element abundances...Peucker-Ehrenbrink et al., -p 2012). re Mid-ocean ridge magma chambers are believed to mainly consist...chalcogen element and the Os isotopic signature of mid-ocean ridge basalts. The ophiolites exposed along the...ultraslow spreading ocean developed in conjunction with the opening of the Central Atlantic Ocean (Lagabrielle |  | | Journal (article/letter/editorial) | | sequences from the oceanic core complexes of the Mid Atlantic Ridge. Initial cooling of the Ligurian gabbros...by heat from magma bodies intruding beneath the ridge (e.g., Alt, 1995). The transition from magmatic...amphiboles from the gabbroic sequences of the Mid Atlantic Ridge have major and trace element compositions...from ODP Hole 735B gabbros at Southwest Indian Ridge were produced by high temperature interaction with...studying the magmatic–hydrothermal transition at mid ocean ridges. They preserve three-dimensional sections |  | Rampone, Elisabetta, Borghini, Giulio, Godard, Marguerite, Ildefonse, Benoit, Crispini, Laura, Fumagalli, Patrizia (2016) Melt/rock reaction at oceanic peridotite/gabbro transition as revealed by trace element chemistry of olivine. Geochimica et Cosmochimica Acta, 190. 309-331 doi:10.1016/j.gca.2016.06.029 | Journal (article/letter/editorial) | | an hectometer-scale body of troctolites and plagioclase wehrlites, and both are cut by later decameter-wide...consistent with a process of olivine assimilation and plagioclase crystallization at decreasing melt mass, in agreement...(troctolites, werhlites, olivine gabbros) from modern ridge settings and ophiolites (Lissenberg and Dick, 2008;...involving concomitant olivine dissolution and plagioclase crystallization. Furthermore, discrepancies between...lithospheric level, leading to the formation of plagioclase-enriched impregnated peridotites, iii) multiple |
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