Chromite-Rich and Chromite-Poor Ophiolites: The Oman Case
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Chroinite deposits in Oman belong dominantly to the concordant structural type, meaning that these have been intensely deformed by plastic flow and tectonically rotated to become parallel to the peridotite foliation. This occurred soon after their formation within the transition zone below the ridge of origin. Subconcordant and discordant pods are also present. The latter have preserved delicate magmatic structures showing that they have only been little deformed after their formation in melt-carrying conduits. Regionally, the chromite deposits have been dominantly found, so far, in restricted areas whereas large areas of Oman seem to be devoid of deposits. Maqsad, one of the largest chromite districts, was also an area of mantle diapirism below the ridge of origin. This association is well explained if it is considered that most of mantle melt feeding the crust at ridges is expected to be delivered through such diapirs. Although Oman is the largest and best exposed ophiolite in the world, it seems to be comparatively poor in chromite due to the spreading situation. In the Lherzolite Ophiolite Type (LOT), thought to be derived from slow spreading ridges, the chromite deposits are absent as a result of chromium being retained in mantle diopside during partial melting. The chromite deposits are restricted to the Harzburgite Ophiolite Type (HOT) in which chromium has passed into the melt. Although Oman belongs to the HOT group, it seems to have been a particularly fast spreading HOT. It is suggested that in such a situation the transition zone, which is the level where the chromite normally precipitates from the melt, due to temperature drop, could have remained too hot to allow for abundant chromite formation.
- Ahmad, Z. and Bilgrami, S.A., 1987. Chromite deposits and ophiolites of Pakistan, In: Evolution of chromium fields, C.S. Stowe (ed), Van Nostrand Reinhold Co., New-York, pp. 239–264.
- Augé, T., 1982. Etude minéralogique et pétrographique de roches basiques et ultrabasiques du complexe ophiolitique du Nord Oman, Relations avec les chromitites comparaison avec deux complexes dArabie Saoudite, Thèse 3ème cycle, Univ. Orléans, Fr., 263 p.
- Augé, T. and Roberts, S., 1982. Petrology and geochemistry of some chromitiferous bodies within the Oman ophiolite.; Ofioliti, 7: 133–154.
- Bacuta, G.C., 1978. Geology of some Alpine-type chromite deposits in the Philippines: Manila, Philippines., Bur. Mines, unpub. Rep., 22 p.
- Boudier, F. and Nicolas, A., 1985. Harzburgites and lherzolites subtypes in ophiolitic and oceanic environments., Earth Planet. Sci. Lett., 76: 84–92. CrossRef
- B.R.G.M./Oman, 1985. Mineral deposits of the mountains of Northern Oman, Map 1/1,000,000, Sultanate of Oman, (Ed.)
- Brown, M.A., 1982. Chromite deposits and their ultramafic host rocks in the Oman ophiolite., Dep. Earth Sci. Open Univ., Ph. D. Thesis, 263 p.
- Burgath, K.P., Mohr, M., Ramunlmair D. and Steiner, L., 1982. The chromite potential in North Central Oman (new discoveries). Federal Inst. Geosc. Nat. Res., Hannover, unpublished Rep., 89 p.
- Cassard, D., Nicolas, A., Rabinowicz, M., Moutte, M., Leblanc, M. and Prinzhofer, A., 1981. Structural classification of chromite pods in southern New Caledonia., Econ. Geol., 76: 805–831. CrossRef
- Ceuleneer, G. and Nicolas, A., 1985, Structures in podiform chromite from the Maqsad district (Sumail ophiolite, Oman)., Mineral. Deposita, 20: 177–185. CrossRef
- Ceuleneer, G., Nicolas, A. and Boudier, F., 1988. Mantle flow patterns at an oceanic spreading centre: the Oman peridotites record., Tectonophysics, 151: 1–26. CrossRef
- Christiansen, F.G., 1985. Deformation fabric and microstructures in ophiolitic chromitites and host ultramafics., Sultanate of Oman, Geologische Rundschau, 74: 61–76. CrossRef
- Christiansen, F.G., 1986. Structures of ophiolitic chromite deposits, Thesis Lic. Scient. degree, Univ. Aarhus, Denmark.
- Detrick, R.S., Bulh, P., Vera, E., Mutter, J., Orcutt, J., Madsen, J. and Brocher, T., 1987: Multi-channel seismic imaging of a crustal magma chamber along the East Pacific Rise., Nature, 326: 35–41. CrossRef
- Dogan Paktunc, A., 1990. Origin of podiform chromite deposits by multistage melting, melt segregation and magma mixing in the upper mante., Ore Geol. Rev., 5: 211–222. CrossRef
- Engin, T, Ozkoçak, O. and Artan, U., 1987. General geological setting and character of chromite deposits in Turkey. In: Evolution of chromium fields, Stowe CX.W. (ed.), New-York, Van Nostrand Reinhold Co. pp. 195–219.
- Hock, M. and Friedrich, G., 1985. Structural features of ophiolitic chromitites in the Zambales Range, Luzon, Philippines., Mineral. Deposita, 20: 290–301. CrossRef
- Lago, B.L., Rabinowicz, M. and Nicolas, A., 1982. Podiform chromite ore bodies: a genetic model., J. Petrol., 23: 103–125. CrossRef
- Leblanc, M., 1987, Chromite in oceanic arc environments: New-Caledonia, In: Evolution of chromium ore fields, C.W. Stowe (ed.), Van Nostrand Reinhold Co, pp. 265–295.
- Leblanc, M. and Violette, J.F., 1983. Distribution of aluminium-rich and chromium-rich chro-mite pods in ophiolite peridotites., Economic Geology, 78: 293–301. CrossRef
- Malpas, J. and Strong D.F., 1975. A comparison of chromite-spinels in ophiolites and mantle diapirs of Newfoundland., Geochim. Cosmochim Acta, 39: 1045–1060. CrossRef
- Nicolas, A., 1986. Structure and petrology of peridotites., Rev. Geophys., 24: 875–895. CrossRef
- Nicolas, A., 1989. Structures of Ophiolites and dynamics of oceanic lithosphere, Kluwer Ed., 367 p.
- Nicolas, A. and Violette, J.F., 1982. Mantle flow at oceanic spreading centers: models derived from ophiolites., Tectonophysics, 81: 319–339. CrossRef
- Nicolas, A., Reuber, I. and Benn, K., 1988. A new magma chamber model based on structural studies in the Oman ophiolite., Tectonophysics, 151: 87–105. CrossRef
- Pantakis, M.T., 1980. Chromite mineralization associated with the Troodos ophiolite, Cyprus, International Symposium on Metallogeny of mafic and ultramafic complexes of the eastern Mediterranean and western Asian area and its comparison with similar metallogenic environments of the word, pp. 91–97. Athens: UNESCO IGCP Publication, 1, National Technical Univ., Athens.
- Rabinowicz, M., Nicolas, A. and Vigneresse, J.L., 1984. A rolling mill effect in asthenospheric beneath oceanic spreading centers., Earth Planet. Sci. Lett., 67: 97–108. CrossRef
- Rabinowicz, M., Ceuleneer, G. and Nicolas, A., 1987. Melt segregation and flow in mantle diapirs below spreading centers: evidence from the Oman ophiolites., J. Geophys. Res., 92: 3475–3486. CrossRef
- Rassios, A. and Vacondios, I., 1986. Chromite mineralization and Mining at Vourinos., EEC Internal Rep., Athens, pp. 128–142.
- Roberts S., 1988. Ophiolitic chromitite formation: a marginal basin phenomenon?, Econ. Geology, 83: 1034–1036. CrossRef
- Thayer, T.P., 1969. Gravity differenciation and magmatic re-emplacement of podiform chromite deposits., Econ. Geol. Monogr., 4: 132–146.
- Thayer, T.P. and Lipin B.R., 1978. A geological analysis of world chromite production to the year 2000 A.D., Proceedings 107th Annual Meeting Council of Economics of AIME, pp. 143–146.
- Vacondios, I., 1986. Chromite mine in Tsangli, Workshop on Greek ophiolites., Inst. Geol. Min. Expl., Athens, pp. 55–57.
- Chromite-Rich and Chromite-Poor Ophiolites: The Oman Case
- Book Title
- Ophiolite Genesis and Evolution of the Oceanic Lithosphere
- Book Subtitle
- Proceedings of the Ophiolite Conference, held in Muscat, Oman, 7–18 January 1990
- Book Part
- Part II
- pp 261-274
- Print ISBN
- Online ISBN
- Series Title
- Petrology and Structural Geology
- Series Volume
- Series ISSN
- Springer Netherlands
- Copyright Holder
- Ministry of Petroleum and Minerals, Sultanate of Oman
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