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naseri N, Zarei Sahamieh R, Leybourne M, Costa dos Santos A, Ahmadi Khalaji A. Geochemical characteristics of potassic alkaline magmatism of the northeastern Qazvin (Pargeh area). www.ijcm.ir 2024; 32 (1) :61-74
URL: http://ijcm.ir/article-1-1856-en.html
URL: http://ijcm.ir/article-1-1856-en.html
Nahid Naseri1 
, Reza Zarei Sahamieh * 1, Matthew Leybourne2 , Anderson Costa dos Santos3 , Ahmad Ahmadi Khalaji1
, Reza Zarei Sahamieh * 1, Matthew Leybourne2 , Anderson Costa dos Santos3 , Ahmad Ahmadi Khalaji1
1- Department of Geology, Faculty of Sciences, Lorestan University, Khorramabad, Iran
2- Queen’s Facility for Isotope Research, Department of Geological Sciences and Geological Engineering, Queen’s University, Kingston, Ontario, Canada K7L 3N6
3- Rio de Janeiro State University (UERJ), Geology Faculty, Departamento de Mineralogia e Petrologia Ígnea (DMPI), Brazil
2- Queen’s Facility for Isotope Research, Department of Geological Sciences and Geological Engineering, Queen’s University, Kingston, Ontario, Canada K7L 3N6
3- Rio de Janeiro State University (UERJ), Geology Faculty, Departamento de Mineralogia e Petrologia Ígnea (DMPI), Brazil
Abstract: (1245 Views)
The Pargeh pluton is located in the northeast of Qazvin. The rocks of this pluton mainly include monzogabbro and olivine gabbro, which mineralogically contain olivine, clinopyroxene, plagioclase, biotite and alkali feldspar. Geochemically, they have features of potassic alkaline magmas with enrichment in large ion lithophile elements (LILE: Ba, U, Pb, Sr) and depletion in high field strength elements (HFSE: Nb, Ti, Zr), which are similar to subduction zone magmatism and mantle-derived magmas. Chondrite-normalized REE plots show enrichment in light REE (LREE) (4.43< (La/Yb) N <8.58)) and slight negative anomalies (Eu/Eu* = 0.82-0.99). The studied gabbroic rocks have resulted from fractional crystallization of a parental magma which formed by partial melting of depleted lithospheric mantle with spinel-peridotite composition. The primary ratios of 87Sr/86Sr and 143Nd/144Nd (0.70493-0.70525 and 0.51272-0.51269) are compatible with the parental magma formation in the mantle wedge. The values of ɛNd(i) (1.47 to 1.92) are in the range of mantle-derived melts. We suggest that Pargeh gabbroic rocks are part of the Alborz magmatic belt, which according to the geochemical data, their tectonic setting is consistent with a post-collisional, back-arc extensional environment.
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