GABBRO FROM THE KALAYBAR, HASHT-SAR; SUBDUCTION-RELATED METASOMATISM EFFECT

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MODJARRAD M.; MOAYYED M.; HOSSEIN ZADEH G.

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ISSN: 2588-4824

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Journal: Iranian Journal of Geology Year:2011 | Volume:5 | Issue:19 Page(s): 61-80

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Title

GABBRO FROM THE KALAYBAR, HASHT-SAR; SUBDUCTION-RELATED METASOMATISM EFFECT

Author(s)

MODJARRAD M. | MOAYYED M. | HOSSEIN ZADEH G. | Issue Writer Certificate

Keywords

SECONDARY PALAEO-TETHYSQ2

SUBDUCTIONQ2

KALAYBARQ2

GABBROQ2

METASOMATISMQ2

Abstract

In the KALAYBAR Hasht-Sar area, in the western part of SECONDARY PALAEO-TETHYS suture zone (NW Iran), GABBRO intrusion, which is older than Paleocene in age, has cropped out. This GABBRO is shoshonitic in composition with has arc type geochemical composition. The rocks show high K2O concentration and enrichment of Rb, Ba, U, Th and Pb and depletion of Ta, Nb, Ti also Hf, Zr on primitive mantle-normalized spider diagrams. The parental magma of GABBRO is formed by low partial melting rate (less than 10%) of spinel-garnet lherzolite. According to trace elemental ratios, the GABBRO was derived from a source strongly modified by subducted slab fluids. Then crustal contamination caused the LILE enrichment in the magma. Considering accompany of the rocks with Palaeo-Tethys suture zone suit, it seems that GABBRO was formed due to SUBDUCTION of this oceanic crust. METASOMATISM above SUBDUCTION zone is an important process that produced heterogeneous mantle and thus changes in geochemical ratios of the magma.

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APA: Copy

MODJARRAD, M., MOAYYED, M., & HOSSEIN ZADEH, G.. (2011). GABBRO FROM THE KALAYBAR, HASHT-SAR; SUBDUCTION-RELATED METASOMATISM EFFECT. IRANIAN JOURNAL OF GEOLOGY, 5(19), 61-80. SID. https://sid.ir/paper/129432/en

Vancouver: Copy

MODJARRAD M., MOAYYED M., HOSSEIN ZADEH G.. GABBRO FROM THE KALAYBAR, HASHT-SAR; SUBDUCTION-RELATED METASOMATISM EFFECT. IRANIAN JOURNAL OF GEOLOGY[Internet]. 2011;5(19):61-80. Available from: https://sid.ir/paper/129432/en

IEEE: Copy

M. MODJARRAD, M. MOAYYED, and G. HOSSEIN ZADEH, “GABBRO FROM THE KALAYBAR, HASHT-SAR; SUBDUCTION-RELATED METASOMATISM EFFECT,” IRANIAN JOURNAL OF GEOLOGY, vol. 5, no. 19, pp. 61–80, 2011, [Online]. Available: https://sid.ir/paper/129432/en

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