Spinel composition as a petrogenetic indicator of the mantle section in the Forumad ophiolite, NW Sabzevar, NE Iran

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HEIDARI M.; GHORBANI GH.; SHAFAII MOGHADAM H.

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Journal: GEOSCIENCES Year:2019 | Volume:28 | Issue:112 Page(s): 59-70

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Information Journal Paper

Title

Spinel composition as a petrogenetic indicator of the mantle section in the Forumad ophiolite, NW Sabzevar, NE Iran

Author(s)

HEIDARI M. | GHORBANI GH. | SHAFAII MOGHADAM H. | Issue Writer Certificate

Keywords

SpinelQ2

AbyssalQ1

BoniniteQ2

PeridotiteQ2

Supra-subductionQ1

SabzevarQ1

Abstract

Forumad area is located in NW of Sabzevar, in NE of central Iran structural zone and in western part of Sabzevar ophiolite suite. The mantle section of Forumad ophiolite consists mainly of harzburgites, dunites, pyroxenitic dikes and choromititic lenses that contain brown to black Cr-Spinels. The content of Cr2O3 and Al2O3 of Cr-Spinels in harzburgites are between 32. 6-53. 1 and 15. 6-34. 8 wt%, respectively, and their Cr# ([100 × Cr/(Cr + Al]) atomic ratio]) is between 39-69%. Relationship between Cr# of Cr-Spinels and Fo of coexisting olivine (Fo=91-92%), and orthopyroxene and low contents of TiO2 (<0. 06 wt%) indicating that harzburgites fall whitin the olivine-Spinel mantle array (OSMA), and plot in Abyssal and forearc Peridotites fields and are residual of moderate degrees of partial melting (about 15 to 26%) from moderately depleted mantle. But, the content of Cr# in Cr-Spinels of dunites, chromitites and pyroxenites are high (between 81-. 85%), and associated to boninitic melts and indicate that formed by high degrees of partial melting. Consequently, minerals chemistry of Cr-Spinel, clinopyroxene, orthopyroxene and olivine of mantle section from Forumad ophiolite indicate that genesis of this ophiolite have been involved in a suprasubduction zone, and developed as a result of northward subduction of the sea/ocean of the Neo-Tethys in response to the convergence between the Central-east Iranian microcontinent and Alborz (Turan) plates.

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APA: Copy

HEIDARI, M., GHORBANI, GH., & SHAFAII MOGHADAM, H.. (2019). Spinel composition as a petrogenetic indicator of the mantle section in the Forumad ophiolite, NW Sabzevar, NE Iran. GEOSCIENCES, 28(112 ), 59-70. SID. https://sid.ir/paper/32160/en

Vancouver: Copy

HEIDARI M., GHORBANI GH., SHAFAII MOGHADAM H.. Spinel composition as a petrogenetic indicator of the mantle section in the Forumad ophiolite, NW Sabzevar, NE Iran. GEOSCIENCES[Internet]. 2019;28(112 ):59-70. Available from: https://sid.ir/paper/32160/en

IEEE: Copy

M. HEIDARI, GH. GHORBANI, and H. SHAFAII MOGHADAM, “Spinel composition as a petrogenetic indicator of the mantle section in the Forumad ophiolite, NW Sabzevar, NE Iran,” GEOSCIENCES, vol. 28, no. 112 , pp. 59–70, 2019, [Online]. Available: https://sid.ir/paper/32160/en

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