PETROLOGY, PETROFABRIC AND VARIOUS TYPES OF METAMORPHISM IN NAIN OPHIOLITIC MASSIF (CENTRAL IRAN)

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RAHGOSHAI MOHAMMAD; SHAFAEI MOGHADAM H.; MONSEF I.

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Journal: JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT) Year:2006 | Volume:32 | Issue:2 (SECTION GEOLOGY 1) Page(s): 37-56

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Title

PETROLOGY, PETROFABRIC AND VARIOUS TYPES OF METAMORPHISM IN NAIN OPHIOLITIC MASSIF (CENTRAL IRAN)

Author(s)

RAHGOSHAI MOHAMMAD | SHAFAEI MOGHADAM H. | MONSEF I. | Issue Writer Certificate

Keywords

AMPHIBOLITEQ3

SPILLITEQ3

META-GABBROQ3

SHEAR LOCALIZATIONQ3

SUBGRAINQ3

DEFORMATION TWINQ3

DYNAMIC RECRYSTALLIZATIONQ3

PALEO-TRANSFORM FAULTQ3

Abstract

The Nain ophiolitic massif, in the north of Nain town, consisted in lhezolitic-gabbroic (pegmatitic) bodies. Harzburgites, AMPHIBOLITEs, isotropic gabbros, pillow lavas, gabbroic sills and dikes, pyroxenitic dikes, wherlitic dikes and gabbroic impregnations are also found. The crustal sequence is thin and is composed of limited volumes of pillow lavas and isotropic gabbros that gradually terminate into pelagic limestones and charts in the upper levels. AMPHIBOLITEs can be divided into garnet AMPHIBOLITEs with hornblende lineation, AMPHIBOLITE mylonites with amphibole stretched lineation and non-foliated massive AMPHIBOLITEs. The other metamorphosed units are SPILLITEs that include spillitized pillow lavas, diabases, isotropic gabbros and tuffites-tuffitic sandstones. META-GABBROs associated with meta-peridotites and serpentinites are the abundant metamorphosed units of this massif. Pegmatitic gabbros are uplifted as melt mush in which the high plastically deformed clinopyroxenes can corroborate this hypothesis. Wherlitic dikes show shear or stress localization in the shear zones. The higher values of Cr and MgO# in isotropic gabbros than in basaltic rocks represent the equilibrium of gabbros with upper mantle peridotites. The clutter and fragmentation of this massif, also the thin crustal sequence, the volumetric serpentinites with intermingled exotic blocks of limestone, the heterogeneous plastic behavior of deformed minerals in mantle sequence and other factors demonstrate the derivation of this massif from the PALEO-TRANSFORM FAULT. We consider that this paleo-trans form fault belongs to a slow spreading oceanic ridge.

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APA: Copy

RAHGOSHAI, MOHAMMAD, SHAFAEI MOGHADAM, H., & MONSEF, I.. (2006). PETROLOGY, PETROFABRIC AND VARIOUS TYPES OF METAMORPHISM IN NAIN OPHIOLITIC MASSIF (CENTRAL IRAN). JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT), 32(2 (SECTION GEOLOGY 1)), 37-56. SID. https://sid.ir/paper/2155/en

Vancouver: Copy

RAHGOSHAI MOHAMMAD, SHAFAEI MOGHADAM H., MONSEF I.. PETROLOGY, PETROFABRIC AND VARIOUS TYPES OF METAMORPHISM IN NAIN OPHIOLITIC MASSIF (CENTRAL IRAN). JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT)[Internet]. 2006;32(2 (SECTION GEOLOGY 1)):37-56. Available from: https://sid.ir/paper/2155/en

IEEE: Copy

MOHAMMAD RAHGOSHAI, H. SHAFAEI MOGHADAM, and I. MONSEF, “PETROLOGY, PETROFABRIC AND VARIOUS TYPES OF METAMORPHISM IN NAIN OPHIOLITIC MASSIF (CENTRAL IRAN),” JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT), vol. 32, no. 2 (SECTION GEOLOGY 1), pp. 37–56, 2006, [Online]. Available: https://sid.ir/paper/2155/en

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