 | | Journal (article/letter/editorial) | | podiform chromitites from the mantle section of the Oman ophiolite: A review Hugh Rollinson ⁎, Jacob Adetunji...Ophiolite Chromitites Geochemistry Petrogenesis Oman a b s t r a c t Data are presented for mantle podiform...eight localities over 350 km strike length of the Oman ophiolite. Chromitite compositions form a continuum...conflates a number of different magmatic ‘events’. The Oman mantle chromitites record a wide range of Fe3+/ΣFe...and Al2O3 contents for the parental melts to the Oman chromitites show that they had low TiO2 contents |  | 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...diopsidites) from the lowermost crust along Wadi Fizh in the northern Oman ophiolite. The anorthite diopsidites...Hydrothermal fluids, Upper mantle, Lower-crust gabbro, Oman ophiolite INTRODUCTION Although hydrothermal circulation...fluids within this zone remain controversial. The Oman ophiolite offers unparalleled information on this...Yoshi take et al., 2009) and penetrated further down to the layered gabbros (Kawahata et al., 2001; Abily |  | 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) | | minerals Article Hydrothermal Chromitites from the Oman Ophiolite: The Role of Water in Chromitite Genesis...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 |  | | Journal (article/letter/editorial) | | chromitite 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...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...concerning the distribution and mineralogy of PGEs in the Oman ophiolite in general, especially in its northern |  | Akizawa, Norikatsu, Tamura, Akihiro, Fukushi, Keisuke, Yamamoto, Junji, Mizukami, Tomoyuki, Python, Marie, Arai, Shoji (2016) High-temperature hydrothermal activities around suboceanic Moho: An example from diopsidite and anorthosite in Wadi Fizh, Oman ophiolite. Lithos, 263. 66-87 doi:10.1016/j.lithos.2016.07.012 | Journal (article/letter/editorial) | | example from diopsidite and anorthosite in Wadi Fizh, Oman ophiolite an Norikatsu Akizawa, Akihiro Tamura...example from diopsidite and anorthosite in Wadi Fizh, Oman ophiolite, LITHOS (2016), doi: 10.1016/j.lithos...example from diopsidite and anorthosite in Wadi Fizh, Oman ophiolite NU 1) Norikatsu Akizawa 1&2 3)...crustal gabbro have been reported along Wadi Fizh, northern NU Oman ophiolite. They are named mantle diopsidite...studies on the Oman ophiolite (e.g., Kawahata et al., 2001; Nicolas et al., 2003; Bosch et al., 2004; Yamaoka |  | | Journal (article/letter/editorial) | | initiation: granitoid dykes from the mantle section of the Oman ophiolite Hugh Rollinson1 Received: 27 February...intrusive into depleted mantle harzburgites of the Oman–UAE ophiolite. A detailed field, petrological and...a MORB-type basalt similar in composition to the Oman Geotimes lavas and a model using the MUQ (MUd from...Queensland) global sediment composition (Kamber et al. Geochim Cosmochim Acta 69:1041–1058, 2005) both...geochronological data suggest a model for the origin of the Oman ophiolite in which it is formed by spreading above |  | | Journal (article/letter/editorial) | | ductile shear zone at the Moho Transition Zone, Oman Ophiolite Katsuyoshi Michibayashi a,b,∗ , Tatsuya...creep superplasticity a b s t r a c t The Fizh massif, Oman Ophiolite, contains a ductile shear zone at...development (Jung and Karato, 2001; Katayama et al., 2004; Jung et al., 2006; Katayama and Karato, 2006; Karato...Hasegawa, 2004; Mizukami et al., 2004; Katayama and Karato, 2006; Tasaka et al., 2008). In contrast, the...are common in nature (e.g., Tommasi et al., 2000; Mehl et al., 2003; Sawaguchi, 2004; Michibayashi and |  | | Journal (article/letter/editorial) | | chemistry of basalSciences, lherzolitesVolume in Oman ophiolite 13 Petrology and chemistry of basal...lherzolites above the metamorphic sole from Wadi Sarami central Oman ophiolite Mohamed Zaki Khedr*,**, Shoji...metamorphic sole at the base of the central Oman ophiolite (Wadi Sarami). We recognized two types of lherzolites...range of Cr# [= Cr/(Cr + Al) from 0.04 to 0.53] and low YFe [Fe3+/(Cr + Al + Fe3+), <0.046], similar...near the paleo-fracture zone located to the east of Wadi Sarami, represent a remnant of asthenospheric materials |  | | Journal (article/letter/editorial) | | High-temperature Hydrothermal Circulation in the Oman Ophiolite------Petrological and Isotopic Evidence...alteration within the gabbros of the Samail ophiolite (Oman) shows that most of the gabbros have been affected...magma chamber. INTRODUCTION hydrothermal systems; Oman ophiolite; Sr and O isotopes; gabbros and massive...Juteau, 1988; Wilcock & Delaney, 1996; Juteau et al., 2000). The existence of a simultaneous deeper and...isotope data, and Lanphere (1981) and McCulloch et al. (1981), on the basis of strontium isotope data, |  | | Journal (article/letter/editorial) | | variations of abyssal peridotites in the central Oman ophiolite: Evidence of oceanic mantle heterogeneity...Slab metasomatism Mantle heterogeneity Wadi Sarami Central Oman ophiolite a b s t r a c t Basal peridotites...metamorphic sole outcropped around Wadi Sarami in the central Oman ophiolite give us an excellent opportunity...spinels show a large variation of Cr# [= Cr/(Cr + Al)] from 0.04 to 0.53, indicating various degrees of...large chemical heterogeneity in the base of the Oman mantle section. This heterogeneity mainly resulted |  | | Report (chapter) | | 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...fugacity produced by hydrous fluids. Chromitites in the Oman Ophiolite reside either in the Moho Transition Zone...with parent mid-ocean ridge basalt (MORB) in the Al-rich chromites could result from rapid cooling of |  | | Report (chapter) | | and that the nappe extends beneath most of the Batinah coastal plain probably with its tapering trailing...trailing edge close to the present Gulf of Oman coastline. Marked structural thinning and imbrication of the...n M o u n t a i n s from near D i b b a in the north to near Sur in the I I 58~ Sheeted dykes and extrusives...different blocks. 1. Fizh, 2. Salahi, 3. Sarami, 4. Haylayn, 5. Rustaq, 6. Ibra (Hopson et al. 1981). Maximum...by imbricate thrusts or reverse faults as in the Wadi Jizi sector. The occurrence of late Cretaceous tectonic |  | | Report (chapter) | | origin of large plagiogranite bodies in northern Oman, and their relationship to the overlying massive...well-preserved and well-exposed Semail ophiolite of northern Oman hosts several large plagiogranite intrusions in...and adjacent to the major ore bodies in northern Oman. The ubiquitous presence of metamorphic actinolitic...composite intrusions. The Semail ophiolite in northern Oman is the largest, best-preserved and best-exposed...& Hopson 1981; Alabaster et al. 1982; Lippard et al. 1986; Nicolas et al. 1994). This magrnatic history |  | Kapsiotis, Argyrios, Ewing Rassios, Anne, Grieco, Giovanni, Antonelou, Aspasia (2017) Genesis of Cr-bearing hydrogrossular-rich veins in a chromitite boulder from Ayios Stefanos, West Othris, Greece: A paradigm of micro-rodingites formation at the late stages of oceanic slab emplacement. Ore Geology Reviews, 90. 287-306 doi:10.1016/j.oregeorev.2017.06.006 | Journal (article/letter/editorial) | | the intruding gabbros indicate that as tremolite substituted for diopside there was production...aqueous medium. This was capable of leaching Cr, Al and Fe2+ from Cr-spinel fragments dispersed within...magmatic and metamorphic lithologies (e.g., Challis et al., 1995; Meyer and Boyd, 1972). The ophiolitic environment...understood (e.g., Austrheim and Prestvik, 2008; Proenza et al., 1999), yet in the case of the Ayios Stefanos chrome...ultramafic rocks (e.g., Coleman, 1967; O’Hanley et al., 1992). Some rodingites have been described that |  | | Journal (article/letter/editorial) | | assemblages are: (1) olivine + anthophyllite + tremolite ± chlorite ± talc (in the basal serpentinites)...peridotites and layered gabbros of the lower crust (Benn et al., 1988; Karson and Collins, 1984). The MTZ consists...complexes (e.g., Amri et al., 1996; Koepke et al., 2007; Rao et al., 2004; Yaliniz et al., 2000). In the case...(dunite-in-gabbro relation), 68 A.H. Ahmed et al. / Lithos 142-143 (2012) 67–83 that was possibly...during obduction (e.g., Gahlan et al., 2012; Koepke et al., 2009; Koga et al., 2001; Uesugi, 2004). There |  | | Journal (article/letter/editorial) | | have high values of Cr# (0.9–1.0) [Cr# = Cr/(Cr + Al]], and low values of Mg# (~0.2) [Mg# = Mg/(Mg + Fe2+]]...Fe2+]] and YFe (<0.3) [YFe = Fe3+/(Fe3+ + Cr + Al]]. They contain appreciable amounts of ZnO (~1 wt%)...1972; Arai, 1973, 1974, 1975; Frost, 1975; Worden et al., 1991) and/or compressed (e.g., Trommsdorff and...and Evans, 1974; Evans, 1977; Padrón–Navarta et al., 2011). Variations in the chemistry and mineral assemblages...Terrane (Fukudomi and Isozaki, 1988; Fukudomi et al., 1989; Fukudomi, 1990). A complex of Cretaceous |  | Shafaii Moghadam, Hadi, Zaki Khedr, Mohamed, Arai, Shoji, Stern, Robert J., Ghorbani, Ghasem, Tamura, Akihiro, Ottley, Chris J. (2015) Arc-related harzburgite–dunite–chromitite complexes in the mantle section of the Sabzevar ophiolite, Iran: A model for formation of podiform chromitites. Gondwana Research, 27 (2) 575-593 doi:10.1016/j.gr.2013.09.007 | Journal (article/letter/editorial) | | upper mantle (e.g., Niu et al., 1997; Uysal et al., 2012; Zaki Khedr et al., 2013). This data also can...ophiolite formed (e.g., Bizimis et al., 2000; Pearce et al., 2000; Aldanmaz et al., 2009). Mantle peridotites...heterogeneity (e.g., Kelemen et al., 1992; Aldanmaz et al., 2009; Uysal et al., 2012). The presence or absence...Please cite this article as: Shafaii Moghadam, H., et al., Arc-related harzburgite–dunite–chromitite complexes...1016/j.gr.2013.09.007 2 H. Shafaii Moghadam et al. / Gondwana Research xxx (2013) xxx–xxx recognized |  | Rospabé, Mathieu, Ceuleneer, Georges, Le Guluche, Vanessa, Benoit, Mathieu, Kaczmarek, Mary-Alix (2021) The Chicken and Egg Dilemma Linking Dunites and Chromitites in the Mantle–Crust Transition Zone beneath Oceanic Spreading Centres: a Case Study of Chromite-hosted Silicate Inclusions in Dunites Formed at the Top of a Mantle Diapir (Oman Ophiolite) Journal of Petrology, 62 (4) doi:10.1093/petrology/egab026 | Journal (article/letter/editorial) | | in Dunites Formed at the Top of a Mantle Diapir (Oman Ophiolite) Mathieu Rospabé1,2*, Georges Ceuleneer2...dunites from the DTZ exposed in the Maqsad area of the Oman ophiolite where a former asthenospheric diapir is...chemical variability of the DTZ dunites. Key words: Oman ophiolite; Maqsad diapir; dunitic mantle–crust transition...surrounded by dunite (e.g. Cassard et al., 1981; González-Jiménez et al., 2014). This observation calls for...g. Quick, 1981a, 1981b; Augé, 1987; Varfalvy et al., 1996; Ahmed & Arai, 2002; Rollinson, 2005, 2008; |  | | Journal (article/letter/editorial) | | (sulphides + ilmenite). The amphibolites are low Al, low K, magnesian–ferroan (Mg# = 0.46–0.75) and medium...the melt (e.g. Ishiwatari et al., 2006; Dantas et al., 2007; Dilek et al., 2008), (2) metamorphism/metasomatism...(Grégoire et al., 2000; 2001) or (3) metasomatic processes in suprasubduction zones (Python et al., 2007;...2007; Bach and Klein, 2009; Santosh et al., 2010; Akizawa et al., 2011). In the case of large masses of *Correspondence...documented in ophiolites (e.g. Kelemen et al., 1995; Suhr et al., 2003), where the pyroxenes reflect the |  | 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) | | article as: N. Akizawa, G.L. Früh-Green, A. Tamura, et al., Compositional heterogeneity and melt transport...Hochschule-Zürich; 3 Jo u rn frueh-green@erdw.ethz.ch al 2 Pr e- (N.A.), chiorita@aori.u-tokyo.ac.jp (C...were found in several pr samples. The Cr/(Cr + Al) ratios (Cr#) of the chromian spinel show bimodal...at least two end-members with regard to the rn al extent of melting: refractory mantle material with...Langmuir et al., 1992; Plank and al Langmuir, 1992). Based on geochemistry of MORBs (Salters et al., 1989; |  | | Journal (article/letter/editorial) | | meltrelated processes. Compiling data of Cr# [Cr/(Cr＋Al) atomic ratio] of spinel and clinopyroxene REE compositions...Bullen, 1984; る中央海嶺玄武岩などの火山岩の解析をもとに行われてき Dick et al., 1984; Dick, 1989)。Bodinier and Godard (2003) は...して扱い，オフィオライトのように陸上に産するかんらん た(例えば，Langmuir et al., 1977; Schilling et al., 1983)。 一方，深海性かんらん岩(abyssal peridotite)を研究対象と...性質を かんらん岩と呼ぶことにする。 関連づけようとしたものである。その上で，Dick et al. (2010)は，上部マントル物質の部分溶融度が海嶺の拡大速 Dick and Bullen ...することが困難になってくると主張した。 供してきた。とくにクロムスピネルの Cr #[ Cr /( Cr ＋ Al ) Dick や Bonatti らによって進められてきたこれまでの 海洋底かんらん岩研究では，岩石試料の採集地域は断裂帯 |  | | Report (volume) | | & ROTHERY, D. A. Ridge axial segmentation in the Oman ophiolite: evidence from along-strike variations...Orogen as a model for the tectonic evolution of Oman-type ophiolites 301 Contents PARSON,L. M. &...& ROTHERY, D. A. Ridge axial segmentation in the Oman ophiolite: evidence from along-strike variations...Orogen as a model for the tectonic evolution of Oman-type ophiolites 301 Ophiolites and their modern...discontinuities in the 500 km long exposed section of the Oman ophiolite. Outcrop interpretations of these types |  | | Journal (volume) | | framing the mineral sciences. [1] Hazen, R.M. et al. (2008) Am. Mineral., 93, 1693-1720. v 40 years...„modern.” [1] Malkovets, V. et al. (2007) Geology, 35, 339-342. [2] Rege, S. et al. (2005) J. Anal. Atom. Spectrom...transparent yet quantitative manner. [1] Burdett, J.K. et al. (1984) Croatia Chem. Acta, 57, 11931216. [2] Burdett...far. [1] Wilke, M. et al. (2001) Am. Mineral., 86, 714-730. [2] Schmid, R. et al. (2003) Lithos, 70, 381-392...381-392. [3] Wilke, M. et al. (2008) Am. Mineral., 93, 235-240. [4] Jugo, P.J. et al. (2010) Geophys. Res |
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