 | | Journal (article/letter/editorial) | | Reaction in the Mantle: Mantle Troctolites from the Parece Vela Ancient Back-Arc Spreading Center 1 DEPARTMENT...ACCESS PUBLICATION JANUARY 17, 2013 The Godzilla Megamullion is a giant oceanic core complex located...extinct slow-spreading segment of the Parece Vela Basin (Philippine Sea). It exposes lower crust and mantle...processes operating in the shallow mantle of a back-arc basin. Here we present data on primitive troctolites and...the megamullion. The troctolites are subdivided into olivine (olivine 460 vol. %) and plagioclase (plagioclase460 |  | Michibayashi, Katsuyoshi, Harigane, Yumiko, Ohara, Yasuhiko, Muto, Jun, Okamoto, Atsushi (2014) Rheological properties of the detachment shear zone of an oceanic core complex inferred by plagioclase flow law: Godzilla Megamullion, Parece Vela back-arc basin, Philippine Sea. Earth and Planetary Science Letters, 408. 16-23 doi:10.1016/j.epsl.2014.10.005 | Journal (article/letter/editorial) | | inferred by plagioclase flow law: Godzilla Megamullion, Parece Vela back-arc basin, Philippine Sea Katsuyoshi...zone mylonite plagioclase flow law Philippine Sea a b s t r a c t We tested plagioclase flow laws for rheological...the Godzilla Megamullion, an enormous oceanic core complex situated in an extinct Philippine Sea back-arc...back-arc basin. The mylonites were produced in the detachment shear zone at temperatures of 650–850 ◦ C...m/s). Applying the rheological parameters for plagioclase flow laws, combined with the geochronological |  | 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) | | gabbro mylonites from the Godzilla Megamullion, Parece Vela Basin, the Philippine Sea Yumiko Harigane, Atsushi...gabbro mylonites from the Godzilla Megamullion, Parece Vela Basin, the Philippine Sea, LITHOS, https://doi...gabbro mylonites from the Godzilla Megamullion, Parece Vela Basin, the Philippine Sea Yumiko Harigane1,2...medial area of the Godzilla Megamullion along the Parece Vela Rift in the Philippine PT Sea. The samples...the original minerals (i.e., clinopyroxene and plagioclase). One sample of gabbro mylonite (KH07-02-D18-1) |  | | Journal (article/letter/editorial) | | gabbroic rocks within the Godzilla Megamullion, Parece Vela Basin, Philippine Sea Yumiko Harigane a,b,⁎,...Mylonite Ultramylonite Shear zone Godzilla Megamullion Parece Vela basin a b s t r a c t Microstructural...area of the Godzilla Megamullion (site KH07-02-D18), located along the Parece Vela Basin spreading ridge...ridge (Parece Vela Rift), Philippine Sea, reveal the development of a high-temperature ductile shear zone...coarse plagioclase and clinopyroxene/amphibole porphyroclasts in a fine-grained matrix. Plagioclase crys |  | | Journal (article/letter/editorial) | | peridotites from the Godzilla Megamullion Oceanic Core Complex, Parece Vela Basin, Philippine Sea Matthew Loocke...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 the Izu–Bonin–Mariana...Complex (OCC). Peridotites recovered from the megamullion are divided petrographically into fertile (e...lherzolites), depleted (e.g. harzburgites), and plagioclase-bearing groups (Ohara et al., 2003a). A total |  | | Journal (article/letter/editorial) | | core complex in backarc basin: New insights from the recent Godzilla Megamullion study 小原 泰彦(Yasuhiko... The Godzilla Megamullion is the largest known oceanic core complex, located in the Parece Vela Basin...extinct backarc basin in the Philippine Sea. The previous studies argued that the basin was active from...rate of 8.87.0 cm/ year full-rate, although the basin shows the characteristics typical for slower spreading...ridges. For example, many peridotites in the Parece Vela Basin are much less depleted than those exposed |  | Morishita, Tomoaki, Ghosh, Biswajit, Soda, Yusuke, Mizukami, Tomoyuki, Tani, Ken-ichiro, Ishizuka, Osamu, Tamura, Akihiro, Komaru, Chihiro, Aari, Shoji, Yang, Hsiao-Chin, Chen, Wen-Shan (2018) Petrogenesis of ultramafic rocks and olivine-rich troctolites from the East Taiwan Ophiolite in the Lichi mélange. Mineralogy and Petrology, 112 (4) 521-534 doi:10.1007/s00710-017-0547-6 | Journal (article/letter/editorial) | | olivine, orthopyroxene, clinopyroxene, spinel and plagioclase can be identified. The ultramafic rocks are classified...those from mid-ocean ridge peridotites as well as back-arc peridotites from the Philippine Sea Plate. The...discrete as well as occasional locally concentrated plagioclase grains. Petrological characteristics coupled...mid-ocean ridge samples, and are slightly different from back-arc samples from the Philippine Sea Plate...petrology and mineralogy between the Philippine Sea and the South China Sea/Eurasian Plates. Keywords East |  | | Journal (article/letter/editorial) | | Tethys) basin. This basin developed in conjunction with the opening of the Central Atlantic Ocean and separated...The Alpine–Apennine ophiolites show evidence for sea-floor exposure of mantle peridotites and included...domains of the Piedmontese–Ligurian basin, similar to the magma-poor ocean–continent transition of Western...to oceanward domains of the Piedmontese–Ligurian basin, do not display relationships with continental crust...hydrothermal mineral deposits in the Piedmontese–Ligurian basin is discussed by Garuti et al. Another main topic |  | 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) | | findings suggest a complex interplay between oceanic basin and back-arc extension environments during the Santa...al., 2001). At extensional environments like mid-ocean ridges (Fig. 1), basaltic melts separate ⁎ Corresponding...deep segments of extensional regimes (i.e., mid-ocean ridges, fore-arc basins, back-arc basins) we rely...massive flows that are typically overlain by deep-sea sediments (Coleman, 1971; Dewey, 1976; Dewey and...associations have commonly been attributed to mid-ocean ridge or back-arc origin, other interpretations |  | Morishita, Tomoaki, Tani, Ken-Ichiro, Soda, Yusuke, Tamura, Akihiro, Mizukami, Tomoyuki, Ghosh, Biswajit (2018) The uppermost mantle section below a remnant proto-Philippine Sea island arc: Insights from the peridotite fragments from the Daito Ridge. American Mineralogist, 103 (7) 1151-1160 doi:10.2138/am-2018-6030 | Journal (article/letter/editorial) | | uppermost mantle section below a remnant proto-Philippine Sea island arc: Insights from the peridotite fragments...Ridge, and Oki-Daito Ridge of the northwestern Philippine Sea Plate are remnants of Mesozoic island arcs...event including melt extraction expected for mid-ocean ridge mantle. Instead, the peridotite source must...section of a remnant proto-Philippine Sea island arc. Keywords: Philippine Sea Plate, Daito Ridge, remnant...Subduction Zone Magma Genesis Introduction The Philippine Sea Oceanic Plate has a complex architecture comprising |  | | 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...concomitant crystallization of PT interstitial plagioclase and clinopyroxene is inferred to originate olivine-rich...clinopyroxene (i.e. XMg, Cr2 O3 and TiO 2 contents) and plagioclase (anorthite content) have been adopted to discriminate |  | Michibayashi, Katsuyoshi, Mainprice, David, Fujii, Ayano, Uehara, Shigeki, Shinkai, Yuri, Kondo, Yusuke, Ohara, Yasuhiko, Ishii, Teruaki, Fryer, Patricia, Bloomer, Sherman H., Ishiwatari, Akira, Hawkins, James W., Ji, Shaocheng (2016) Natural olivine crystal-fabrics in the western Pacific convergence region: A new method to identify fabric type. Earth and Planetary Science Letters, 443. 70-80 doi:10.1016/j.epsl.2016.03.019 | Journal (article/letter/editorial) | | 422-8529, Japan c Research and Development Center for Ocean Drilling Science, JAMSTEC, Yokosuka, 237-0061, Japan...Manoa, Honolulu, HI 96821, USA i College of Earth, Ocean and Atmospheric Sciences, Oregon State University...published previously as well as new data mostly from ocean floor, mainly for the convergent margin of the western...olivine fabric database includes new data from the ocean floor combined with previously published data. About...ridge peridotite data we have are from the Godzilla Megamullion (Harigane et al., 2011a) and the Mariana |  | | Journal (article/letter/editorial) | | thought to derive mainly from the spinel to plagioclase–peridotite stability fields. They are varied...(1995), and Vaselli et al. (1995) for the Pannonian Basin. 2001; 荒井ほか, 2005）（例えば, 西南日本弧 ; Fig. 1）．ダ ナイト中...ている ナ弧の背弧に位置するパレス・ベラ海盆 （Parece Vela Basin）のゴジラ・メガムリオン（Godzilla Megamullion）と呼 ば れ る 巨 大 な 海 洋 コ ア・ コ...? 555 Fig. 3. Characteristics of fore-arc and sea-floor peridotites obtained by dredging, dive, or drilling...(1992), and Nédli et al. (2015) for the Pannonian Basin. 石を報告した．それは，ダナイト岩片を含むオルソパイロク 2007）． シナイト捕獲岩およびダナイト中の直方輝石パッチ〜オルソ |  | | Journal (article/letter/editorial) | | embryonic (ultra-)slow-spreading ocean called Ligurian-Piedmontese basin (Lagabrielle and Cannat 1990; Manatschal...a topographic high in the Ligurian-Piedmontese basin (Durand-Delga et al. 2005). Field relationships...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...origin. The mylonite bands exhibit a hornblende ? plagioclase amphibolite facies metamorphic assemblage and |  | 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...nearly all the plutonic sample suites from mid-ocean ridges (e.g. Elthon 1987; Dick and Natland, 1996;...lowermost crustal sector of Hess Deep in the Pacific Ocean (Gillis et al., 2014) and occur in association |  | | Journal (article/letter/editorial) | | propose that melts migrating through an olivine–plagioclase crystal mush chemically evolved by reaction with...trace element compositions of clinopyroxene and plagioclase (e.g., Tribuzio et al. 1999, 2000; Coogan et...m. These peridotite bodies consist of spinel-plagioclase-bearing clinopyroxene-poor lherzolites to harzburgites...Ol-gabbros consist of euhedral to subhedral plagioclase, subhedral olivine and ophitic to oikocrystic...is locally present along interstices between plagioclase and clinopyroxene, and frequently associated |  | Secchiari, Arianna, Montanini, Alessandra, Bosch, Delphine, Macera, Patrizia, Cluzel, Dominique (2016) Melt extraction and enrichment processes in the New Caledonia lherzolites: Evidence from geochemical and Sr–Nd isotope data. Lithos, 260. 28-43 doi:10.1016/j.lithos.2016.04.030 | Journal (article/letter/editorial) | | minor CE P lherzolites in both the spinel and plagioclase facies. In this study, a comprehensive geochemical...melting in the spinel peridotite field. The T plagioclase lherzolites show melt impregnation microstructures...for these elements SC R suggests that the plagioclase lherzolites originated from residual spinel lherzolites...differs with geodynamic setting, i.e. mid-ocean ridge (MOR), ocean- continenttransition (OCT) and supra-subduction...bulk rocks for selected samples of spinel and plagioclase lherzolites. In addition, Sr-Nd isotope data |  | Cates, Nicole L., Ziegler, Karen, Schmitt, Axel K., Mojzsis, Stephen J. (2013) Reduced, reused and recycled: Detrital zircons define a maximum age for the Eoarchean (ca. 3750–3780Ma) Nuvvuagittuq Supracrustal Belt, Québec (Canada) Earth and Planetary Science Letters, 362. 283-293 doi:10.1016/j.epsl.2012.11.054 | Journal (article/letter/editorial) | | IGC, Itsaq Gneiss Complex; SMOW, Standard Mean Ocean Water; CDT, Canyon Diablo Troilite n Corresponding...dominated by quartz (70–80%), with about 10% plagioclase, and the remaining mineralogy is composed of...alteration of the chemical composition of matrix plagioclase in pyroclastic deposits via seawater (NaCl) brines...temperatures ( 4500 1C). This action albitizes the plagioclase releasing Ca as CaCl2 and Ca(OH)2 for example...reaction: clinopyroxene þcalcic plagioclase þNaCl-fluid-amphiboleþsodic plagioclase (e.g. Harigane et al., 2011; |  | 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 |  | | Journal (article/letter/editorial) | | remnants of a fossil slow-spreading ocean are exposed. Olivines from plagioclase-harzburgites and replacive dunites...lithosphere formed in an embryonic slow-spreading basin (Lagabrielle and Cannat, 1990; Tribuzio et al.,...conjunction with the opening of the Central Atlantic Ocean (Schettino and Turco, 2011; Vissers et al., 2013)...impregnation event and re-equilibration under plagioclase-facies conditions (Rampone et al., 1996, 1997)...1), where they are hosted by melt-impregnated plagioclase-peridotites (see also Kaczmarek and Müntener |  | Satsukawa, T., Ildefonse, B., Mainprice, D., Morales, L. F. G., Michibayashi, K., Barou, F. (2013) A database of plagioclase crystal preferred orientations (CPO) and microstructures – implications for CPO origin, strength, symmetry and seismic anisotropy in gabbroic rocks. Solid Earth, 4 (2). 511-542 doi:10.5194/se-4-511-2013 | Journal (article/letter/editorial) | | CC Attribution 3.0 License. A database of plagioclase crystal preferred orientations (CPO) and microstructures...This study presents a unique database of 172 plagioclase Crystallographic Preferred Orientations (CPO)...fast-spread present-day ocean crust, as well as from the Oman ophiolite. Plagioclase is the dominant mineral...mineral phase in the studied samples. Plagioclase CPOs are grouped into three main categories: Axial-B,...the large number of possible slip-systems in plagioclase probably account for these differences. Calculated |  | | Journal (article/letter/editorial) | | Accepted Manuscript Spinel and plagioclase peridotites of the Nain ophiolites (Central Iran): Evidence...Evidence for the incipient stage of oceanic basin formation Tahmineh Pirnia, Emilio Saccani, Shoji Arai PII:...Pirnia, Emilio Saccani, Shoji Arai , Spinel and plagioclase peridotites of the Nain ophiolites (Central Iran):...Iran): Evidence for the incipient stage of oceanic basin formation. The address for the corresponding author...journal pertain. ACCEPTED MANUSCRIPT Spinel and plagioclase peridotites of the Nain ophiolites (Central Iran): |  | Basch, V., Rampone, Elisabetta, Borghini, G., Ferrando, C., Zanetti, A. (2019) Origin of pyroxenites in the oceanic mantle and their implications on the reactive percolation of depleted melts. Contributions to Mineralogy and Petrology, 174 (12) doi:10.1007/s00410-019-1640-0 | Journal (article/letter/editorial) | | pyroxenites, and (2) plagioclase-facies melt impregnation leading to [plagioclase + orthopyroxene] interstitial...(3) spinel-facies reactive porous flow, (4) plagioclase-facies melt impregnation. The early fractionation...melt–rock interaction history from spinel-facies to plagioclase-facies conditions (Rampone et al. 1997, 2008;...Tribuzio 2011; Basch et al. 2018) and in modern mid-ocean ridges (Dantas et al. 2007; Dick et al. 2010; Warren...remnants of the narrow Jurassic Ligurian Tethys basin. It was opened by passive lithosphere extension |  | | Journal (article/letter/editorial) | | NaCl-H2O fluids on reactions between olivine and plagioclase: An experimental study at 0.8 GPa and 800–900...NaCl-H2O fluids on reactions between olivine and plagioclase: An experimental study at 0.8 GPa and 800–900...NaCl-H2O fluids on reactions between olivine and plagioclase: An experimental study at 0.8 GPa and 800 – 900...NaCl rich brines. In this study, olivine and plagioclase were reacted with varying amounts of fluid IP...in initiating a reaction between olivine and plagioclase. The concentration M of NaCl in the fluid also |  | 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) | | Chiori Tamura1 , and Tomoaki 3 Atmosphere and Ocean Research Institute, The University of Tokyo; akizawa@aori... where mantle-derived rocks were exhumed to the sea floor via detachment faulting, were investigated... they likely transported parental melts of mid-ocean ridge basalt (MORB) beneath paleo-ridge axis. Although...mantle beneath spreading ridges forms Pr mid-ocean ridge basalt (MORB) (e.g., McKenzie and Bickle,...f the Mid-Atlantic Ridge during International Ocean Discovery Program (IODP) Expedition 357 pr (Früh-Green |
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