THE STUDY OF DISEQUILIBRIUM TEXTURES AND MINERAL CHEMISTRY IN ULTRAMAFIC-MAFIC ROCK SUITE EAST OF FARIMAN, NE IRAN

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MOAFPOURIAN G.; POURMOAFI M.; VOSUGHI ABEDINI M.; EMAMI M.H.

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2009 | Volume:17 | Issue:1 Page(s): 109-132

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Title

THE STUDY OF DISEQUILIBRIUM TEXTURES AND MINERAL CHEMISTRY IN ULTRAMAFIC-MAFIC ROCK SUITE EAST OF FARIMAN, NE IRAN

Author(s)

MOAFPOURIAN G. | POURMOAFI M. | VOSUGHI ABEDINI M. | EMAMI M.H. | Issue Writer Certificate

Keywords

NORTHEAST OF IRANQ3

FARIMANQ2

ULTRAMAFIC-MAFIC ROCKSQ3

MINERAL CHEMISTRYQ2

CRYSTALLIZATION TEMPERATUREQ2

KOMATIITEQ2

Abstract

On the basis of petrographic observations and electron microprobe analyses data set on major and minor minerals from ultramafic- mafic rock suite with komatiitic to picritic-tholeiitic affinity, East of FARIMAN, we have investigated some of the petro logical features of their parental magmas and condition of minerals crystallization. Major minerals in ultramafic rocks show various disequilibrium textures, including elongated hopper olivines with sharp tips, and spray to acicular, skeletal and hopper elongated pyroxenes, while in mafic rocks disequilibrium textures are dendritic pyroxene-plagioclase intergrowth. Such textures must have been produced by rapid growth of crystals due to undercooling of a previously superheated melt. High Fo contents of olivines is necessary the equilibrium of these crystals in a hot melt with high MgO content. On the basis of maximum Fo content of an olivine crystal in a komatiitic sample, we have estimated MgO percent and temperature of parent melt as much as 23.74% and 1470oC -1535 oC respectively. High TiO2 contents of pyroxene and spinel crystals indicate that their host magma must have been originated from a fertile mantle source, similar to OIB and /or LIP sources, indicating the probable role of a mantle plume in petro genesis of these rocks.

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APA: Copy

MOAFPOURIAN, G., POURMOAFI, M., VOSUGHI ABEDINI, M., & EMAMI, M.H.. (2009). THE STUDY OF DISEQUILIBRIUM TEXTURES AND MINERAL CHEMISTRY IN ULTRAMAFIC-MAFIC ROCK SUITE EAST OF FARIMAN, NE IRAN. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 17(1), 109-132. SID. https://sid.ir/paper/3775/en

Vancouver: Copy

MOAFPOURIAN G., POURMOAFI M., VOSUGHI ABEDINI M., EMAMI M.H.. THE STUDY OF DISEQUILIBRIUM TEXTURES AND MINERAL CHEMISTRY IN ULTRAMAFIC-MAFIC ROCK SUITE EAST OF FARIMAN, NE IRAN. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2009;17(1):109-132. Available from: https://sid.ir/paper/3775/en

IEEE: Copy

G. MOAFPOURIAN, M. POURMOAFI, M. VOSUGHI ABEDINI, and M.H. EMAMI, “THE STUDY OF DISEQUILIBRIUM TEXTURES AND MINERAL CHEMISTRY IN ULTRAMAFIC-MAFIC ROCK SUITE EAST OF FARIMAN, NE IRAN,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 17, no. 1, pp. 109–132, 2009, [Online]. Available: https://sid.ir/paper/3775/en

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