 | Negishi, Hironori, Arai, Shoji, Yurimoto, Hisayoshi, Ito, Shoichi, Ishimaru, Satoko, Tamura, Akihiro, Akizawa, Norikatsu (2013) Sulfide-rich dunite within a thick Moho transition zone of the northern Oman ophiolite: Implications for the origin of Cyprus-type sulfide deposits. Lithos, 164. 22-35 doi:10.1016/j.lithos.2012.11.024 | Journal (article/letter/editorial) |
| within a thick Moho transition zone of the northern Oman ophiolite: Implications for the origin of Cyprus-type...transition zone Cyprus-type sulfide deposits Oman ophiolite a b s t r a c t Peculiar dunites, in part...(MTZ) are found along Wadi Thuqbah in the northern Oman ophiolite. We discuss their relevance to the formation...Mid-Atlantic Ridge (Hannington et al., 1998; Humphris and Cann, 2000; Humphris et al., 1995) as well as from ophiolites...ophiolites (e.g., Dergachev et al., 2010). Deep processes related to sea-floor sulfide deposit formation |
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| GeoGuide Mike Searle Geology of the Oman Mountains, Eastern Arabia GeoGuide Series Editors Wolfgang...springer.com/series/11638 Mike Searle Geology of the Oman Mountains, Eastern Arabia 123 Mike Searle Department...grateful thanks for the wonderful life we had in Oman in the early days. It is also dedicated to all those...this amazing and wonderful country. Foreword Oman and the UAE possess several geological wonders that...understanding of key Earth dynamic processes. Between the Oman Mountains in the north and the Dhofar Mountains |
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| from the northern Oman ophiolite as the stratigraphically shallowest chromitite in ophiolite and its implication...chromitite was found at Wadi Hilti in the northern Oman ophiolite. It is within a late-intrusive dunite body...chromitite is in the upper crust, by far shallower in ophiolite stratigraphy than the other podiform chromitites...chromitite from Oman has relatively low content of (Cr2O3 + Al2O3), the Cr/(Cr + Al) atomic ratio of...Thayer 1964, 1969; Dickey 1975; Cassard et al. 1981; Lago et al. 1982; Paktunc 1990; Leblanc and Nicolas |
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| peridotite layers under a possible Moho in the northern Oman ophiolite: an example from Wadi Fizh Norikatsu Akizawa...gabbro section along Wadi Fizh of the northern Oman ophiolite to understand the formation mechanism of...wt%) and atomic ratios of Cr/(Cr + Al) (0.5 to 0.6) and Fe3+/(Cr + Al + Fe3+) (0.05 to >0.1) in spinel...Harzburgite, Peridotite/melt reaction, Wadi Fizh, Oman ophiolite INTRODUCTION The petrological nature of the...data and observations of ophiolites. In the Oman ophiolite, however, no such serpentinization fronts have |
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| from the deeper mantle section of the northern Oman ophiolite and its tectonic implications Received:...first time in a podiform chromitite of the northern Oman ophiolite. The chromitite contains £ 1.5 ppm of total...the mantle to the crust (Naldrett 1981; Garuti et al. 1997). PGE-abundance systematics give us information...the early stage of the planet’s history (Jagoutz et al. 1979; Arculus and Delano 1981; O’Neill 1991). PGEs...mineralogy of PGEs in the Oman ophiolite in general, especially in its northern part. We found high PGE |
 | AKIZAWA, Norikatsu, ARAI, Shoji, TAMURA, Akihiro, UESUGI, Jiro, PYTHON, Marie (2011) Crustal diopsidites from the northern Oman ophiolite: Evidence for hydrothermal circulation through suboceanic Moho. Journal of Mineralogical and Petrological Sciences, 106 (5) 261-266 doi:10.2465/jmps.110621b | Journal (article/letter/editorial) |
| diopsidites from Oman ophiolite 261 LETTER Crustal diopsidites from the northern Oman ophiolite: Evidence...lowermost crust along Wadi Fizh in the northern Oman ophiolite. The anorthite diopsidites occur as networks...Hydrothermal fluids, Upper mantle, Lower-crust gabbro, Oman ophiolite INTRODUCTION Although hydrothermal circulation...within this zone remain controversial. The Oman ophiolite offers unparalleled information on this topic...Yoshi take et al., 2009) and penetrated further down to the layered gabbros (Kawahata et al., 2001; Abily |
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| axis: an example from Wadi Fizh of the northern Oman ophiolite Norikatsu Akizawa • Shoji Arai • Akihiro...lithologies in uppermost mantle section of Oman ophiolite are highly complicated, harzburgites especially...at the uppermost mantle section of the northern Oman ophiolite (along Wadi Fizh), and it provides us with...modal clinopyroxene (up to 3.5 vol.%) than ordinary Oman Communicated by T. L. Grove. N. Akizawa (&) S...Melt–harzburgite interaction Sharpest Moho Thin MTZ Oman ophiolite Introduction Abyssal peridotites are in equilibrium |
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| Volume 106, ophiolite page 235 ─ 245, 2011 Origin of spinel dunite veins from northern Oman 235 Origin...Origin of spinel-free dunite veins from northern Oman ophiolite: Possible involvement of a komatiitic melt...chromitite ore body discovered in Wadi Rajmi, northern Oman ophiolite, display a peculiar characteristic of being...dunites (Fo91−93 and 0.2-0.3 wt% NiO). The Cr/(Cr + Al) of chromian spinel grains increases from 0.6 to...oceanic lithosphere that formed the Oman ophiolite. Keywords: Oman ophiolite, Podiform chromitite, Spinel-free |
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| harzburgite zone in the mantle section of the northern Oman Ophiolite (Fizh Block): implications for flux melting...whole rocks from the northern Fizh mantle section in the northern Oman Ophiolite to investigate the formation...varies from 90 to 92 whereas spinel Cr# (¼ Cr/(Cr + Al) atomic ratio) varies from 0.15 to 0.78. The Cr#...the upper bound for abyssal peridotites. In the northern Fizh mantle section, highly refractory harzburgites...We infer a two-stage depletion process in the northern Fizh mantle section. In the first stage, asthenospheric |
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| variations to some discordant chromitites from the Oman ophiolite, a typical podiform chromitite interpreted...Takashima chromitite xenoliths indicate that the Oman discordant podiform chromitites were formed in a...a supra-subduction mantle setting before ophiolite obduction. Keywords: chromitite xenoliths, discordant...chromitites, laurite, Takashima alkali basalt, Oman ophiolite. INTRODUCTION Ultramafic xenoliths provide...representative of sub-arc upper mantle material (e.g., Arai et al. 2007, Arai & Ishimaru 2008). Chromitite xenoliths |
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| chloritization of mafic crust from the northern Oman ophiolite: Implications for estimating the chemical...replaced isotropic gabbro and dolerite in northern Oman ophiolite in order to understand the chemical budget...gabbros and mantle peridotites. - - - Keywords: Ophiolite, Chloritization, Gabbros, Hydrothermal circulation...lithosphere (Seyfried et al., 1978; Mottl and Holland, 1978; Mottl, 1983). The Oman ophiolite, which provides...lithosphere up to the upper mantle (e.g., Kawahata et al., doi:10.2465/jmps.081022b S. Arai, ultrasa@kenroku |
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| mantle processes: Observations from the northern Oman ophiolite Makoto Miura, Shoji Arai and Akihiro Tamura...examined in the mantle section of the northern Oman ophiolite along Wadi Hilti, to constrain its origin...and adjacent peridotites show high Cr# (= Cr/(Cr + Al) atomic ratio), around 0.65 to 0.75, indicating an...supra-subduction zone environment just before ophiolite obduction. Such arc-related features in mantle...depleted harzburgites, Arc-related magmatism, Oman ophiolite, Obduction INTRODUCTION Ophiolites have been |
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| UK (e-mail: mikes@earth.ox.ac.uk) Abstract: The Oman Mountains contain a number of unique and very special...Heritage importance. Large-scale developments in Oman and UAE have already affected some of these sites...Scientific Interest (SSSI). Three geological sites in Oman are so unique and so special that they warrant World...the Semail Ophiolite, the world’s largest, best exposed and most complete ophiolite; Jebel al-Akhdar; and...sites include the Sifah eclogites, the Oman Exotics, Majlis al-Jinn, sites of ‘Snowball Earth’ significance |
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| formation of chromite-oversaturated magmas. Spandler et al. (2005) found a mixing trend for the bulk CE chemical...around the chromitite (e.g., Cassard et al., 1981; Lago et al., 1982) (Fig. 1). Following the hypothesis...Yurimoto, 1994; Zhou et 4 ACCEPTED MANUSCRIPT al., 1994) (Fig. 2). Since then, podiform chromitites...various types (e.g., Proenza et al., 1999; Uysal et al., 2005; Borisova et al., 2012; Ahmed and Habtoor, 2015)...ophiolites (e.g., Robinson et al., 2004; Yang et al., 2007, 2015; Yamamoto et al., MA 2009). The whole framework |
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| contains chromite with an intermediate Cr# (Cr/(Cr + Al)) of 0.4–0.6 is the optimum host for chromitites...genuine MORB, they also form in the typical MA ophiolite tectonic setting, at supra-subduction zone spreading...Peridotite–melt reaction, Ridge segment center, Ophiolite, Mantle drilling 1. Introduction Podiform chromitites... PT (chromian spinel) with a high Cr# (Cr/(Cr + Al)) of 0.7–0.9, previous studies have reported SC...podiform chromitites from Maqsad, southern Oman ophiolite, which they interpreted to have formed in mid-ocean |
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| Available online 16 January 2015 Keywords: Oman ophiolite Spinel-free dunites Komatiitic melt Cumulate...below the Moho transition zone of the northern Oman ophiolite (Wadi Rajmi). Only thick (N50 cm) veins...display high values of Cr# up to 0.8 [Cr# = Cr/(Cr + Al) atomic ratio]. We found that these komatiitic dunites...the high-Ca boninites described from the northern Oman ophiolite (Fizh Block). This strongly suggests a...regime; e.g., sub-arc type (e.g., Arai et al., 2006; Moores et al., 2000; Nicolas and Boudier, 2003). When |
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| chromitite deposits in ophiolites: the Oman case FRANÇOISE BOUDIER1* & ALI AL-RAJHI2 1 Geosciences, University...Commerce & Industry, P.O. Box 550, Muscat, Sultanate of Oman *Corresponding author (e-mail: Francoise.Boudier@gm...chromitite deposits reside. A huge extension of the Oman Ophiolite permits an overview of chromitite distribution...produced by hydrous fluids. Chromitites in the Oman Ophiolite reside either in the Moho Transition Zone or...with parent mid-ocean ridge basalt (MORB) in the Al-rich chromites could result from rapid cooling of |
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| the Wadi Barghah to Salahi area in the northern Oman Ophiolite Ryu Kaneko, Yoshiko Adachi and Sumio Miyashita...the Wadi Barghah to Salahi area in the northern Oman Ophiolite RYU KANEKO1*, YOSHIKO ADACHI2 & SUMIO MIYASHITA1...important element of oceanic lower crust of the Oman Ophiolite, and numerous such dunite and plagioclase wehrlitic...intrusions cut gabbro units in the northern Salahi Block of this ophiolite. For the first time, we describe...wehrlitic intrusions. The Oman Ophiolite extends along the east coast of Oman and the United Arab Emirates |
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| 総 説 日本人による世界のオフィオライト研究 An overview of world ophiolite studies by Japanese researchers Abstract 海野 ...this paper. The Oman Mountains expose the world largest and best preserved ophiolite that provides insights...lithosphere to subarc crust and mantle. The Mirdita Ophiolite exposes mantle peridotites covered by mid-ocean...spreading to a subduction environment. The Luobusa Ophiolite is well-known for its ultrahigh-pressure minerals...mantle that collided with and obducted onto the northern edge of the Australian continent. Volcanic rocks |
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| the Oman ophiolite, during formation from a mid-ocean ridge to the island arc setting (Arai et al., 2006)...Adetunji that the main part of the Oman ophiolite, especially its northern PT part, was constructed at a...the Oman ophiolite was MORB-like it was subtly different from NU present-day MORB (Akizawa et al., 2012)...1997) along the melt conduit in the mantle (Lago et al., 1982). It should be noted that the reaction comprises...harzburgites in which chromite has moderate Cr# (Cr/(Cr + Al) of, around 0.5 (Arai and Abe, 1995; Arai, 1997) |
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| record of supra-subduction zone setting for the Oman ophiolite mantle Akihiro Tamura ⁎, Shoji Arai Department...suite from the West Jizi block in the northern Oman ophiolite as a record of supra-subduction zone magmatism...suite are characterized by high Cr# [= Cr / (Cr + Al) atomic ratio] of spinel (Cr# ≥ 0.65). The Fo content...supra-subduction zone setting experienced by the Oman ophiolite mantle. © 2006 Elsevier B.V. All rights reserved...spinel; Oman ophiolite; Arc-related mantle; Boninite magma 1. Introduction The Oman ophiolite is regarded |
 | Arai, Shoji, Miura, Makoto, Tamura, Akihiro, Akizawa, Norikatsu, Ishikawa, Akira (2020) Hydrothermal Chromitites from the Oman Ophiolite: The Role of Water in Chromitite Genesis. Minerals, 10 (3) 217 doi:10.3390/min10030217 | Journal (article/letter/editorial) |
| Article Hydrothermal Chromitites from the Oman Ophiolite: The Role of Water in Chromitite Genesis Shoji...hydrothermal fluids, in the mantle to the crust of the Oman ophiolite. Here, we present petrologic characteristics...magmatic podiform chromitite by dominance of the Ca-Al silicates in the matrix. The fluids responsible for...(especially Pt and Pd). The fluids obtain Ca and Al from the crustal rocks and Cr from the mantle rocks...Keywords: hydrothermal chromitites; Ca-Al silicates; seawater; Oman ophiolite; slab-derived fluids; platinum-group |
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| and stratigraphic distribution in the Semail Ophiolite, Oman Samuel Gilgen, Larryn W. Diamond, Ivan Mercolli...and stratigraphic distribution in the Semail Ophiolite, Oman, LITHOS (2016), doi: 10.1016/j.lithos.2016...and stratigraphic distribution in the Semail Ophiolite, Oman MA NU Samuel Gilgena, Larryn W. Diamond*a...mercolli@geo.unibe.ch Gilgen et al. "Timing of epidotization in Semail Ophiolite" Version 22May2016 1 ACCEPTED...epidotization of igneous rocks is a common feature in the ophiolite record of hydrothermally altered oceanic crust |
 | Matsukage, K. N., Kikuchi, S., Ono, S., Nishihara, Y., Kikegawa, T. (2010) Density and seismic velocities of chromitite body in oceanic mantle peridotite. American Mineralogist, 95 (10) 1422-1428 doi:10.2138/am.2010.3498 | Journal (article/letter/editorial) |
| from the Oman ophiolite were calculated and compared with those of oceanic peridotites. The Oman chromitite...Chromitite, oceanic peridotite, seismic velocities, ophiolite iNtroductioN Podiform chromitite bodies are locally...orogenic peridotite complexes and mantle sections of ophiolite all over the world. Although they exist only in...setting of the formation of igneous sections in ophiolite. Despite the considerable number of studies done...the formation of the igneous sequence of the Oman ophiolite, in which there are large chromitite bodies |
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| mantle section of the Oman ophiolite 高澤 栄一(Eiichi TAKAZAWA) The Oman ophiolite is a remnant of Neo-Tethyan...Salahi blocks in the northern Oman ophiolite. The range of spinel Cr#[＝Cr/(Cr＋Al) atomic ratio] in harzburgites...paleo-ridge segment center to the margin. In the northern part, where a paleo-ridge segment margin was inferred...the northern Oman ophiolite can be modeled as follows. During oceanic thrusting the Oman ophiolite was...pathways for ‰uid inˆltration from the base of the ophiolite, which was instrumental for ‰ux melting of wallrock |
