MICROSTRUCTURAL EVOLUTION OF THE MANTLE LITHOSPHERE IN THE KHOY OPHIOLITES-NW OF IRAN

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RAHGOSHAI MOHAMMAD; MONSEF I.; SHAFAEI MOGHADAM H.; MOHAJEL MOHAMMAD

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Journal: GEOSCIENCES Year:2007 | Volume:16 | Issue:63 Page(s): 2-17

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Information Journal Paper

Title

MICROSTRUCTURAL EVOLUTION OF THE MANTLE LITHOSPHERE IN THE KHOY OPHIOLITES-NW OF IRAN

Author(s)

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

Keywords

KHOY OPHIOLITIC COMPLEXQ2

ULTRAMAFIC TECTONITESQ3

SHEAR ZONESQ2

LATTICE PREFERRED ORIENTATION (LPO)Q3

SLIP SYSTEMQ3

Abstract

Petrofabric, structural and geochemical study of the ULTRAMAFIC TECTONITES in the KHOY OPHIOLITIC COMPLEX suggest that these tectonites including low-temperature NW-SE SHEAR ZONES cut the high-temperature to medium-temperature NE-SW mantle flow direction. Microstructures in these tectonites, record a fabric transition from oblate porphyroclastic and oblong porphyroclastic textures (related to the high- and medium-T deformations in mantle sections) to mylonitic textures (with low-T deformation in the SHEAR ZONES). The study of olivine LPO patterns in high- and medium-T deformation samples of mantle shows slip on the (010) [100] high-temperature-low stress and (Okl) [100] moderate-temperature systems (up to 1000o)while olivine LPO patterns in the low-T deformation samples within the SHEAR ZONES indicate gliding along (001) [100] low temperature SLIP SYSTEM (800-900o). Spinels in these peridotites show high variations in Cr number (10 to 90) and Mg number (50 to 90). Cpxs rich in Cr suggest a low degree of partial melting in these peridotites. The very variable composition of the spinels may be the result of partial melting process and recrystallization of these minerals in the mantle lithosphere during the detachment phase and the development of the SHEAR ZONES.

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APA: Copy

RAHGOSHAI, MOHAMMAD, MONSEF, I., SHAFAEI MOGHADAM, H., & MOHAJEL, MOHAMMAD. (2007). MICROSTRUCTURAL EVOLUTION OF THE MANTLE LITHOSPHERE IN THE KHOY OPHIOLITES-NW OF IRAN. GEOSCIENCES, 16(63), 2-17. SID. https://sid.ir/paper/31768/en

Vancouver: Copy

RAHGOSHAI MOHAMMAD, MONSEF I., SHAFAEI MOGHADAM H., MOHAJEL MOHAMMAD. MICROSTRUCTURAL EVOLUTION OF THE MANTLE LITHOSPHERE IN THE KHOY OPHIOLITES-NW OF IRAN. GEOSCIENCES[Internet]. 2007;16(63):2-17. Available from: https://sid.ir/paper/31768/en

IEEE: Copy

MOHAMMAD RAHGOSHAI, I. MONSEF, H. SHAFAEI MOGHADAM, and MOHAMMAD MOHAJEL, “MICROSTRUCTURAL EVOLUTION OF THE MANTLE LITHOSPHERE IN THE KHOY OPHIOLITES-NW OF IRAN,” GEOSCIENCES, vol. 16, no. 63, pp. 2–17, 2007, [Online]. Available: https://sid.ir/paper/31768/en

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