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PETROGRAPHY AND GEOCHEMISTRY OF SHAYKHAB SUBVOLCANIC ROCKS, CENTRAL ALBORZ ZONE, NORTHERN IRAN
Abstract
The studied area is situated about 70 Km in west of Damghan, and from the structural point of view, the area is part of south of central Alborz zone. Granitoid bodies intruded into late Eocene volcanic and volcanoclastic, mainly composed of monzonite and granite composition. Mineralogically, these rocks contain qua rtz, plagioclase, alkali- feldspare, amphibole, clinopyr oxene, biotite, zircon, apatite, and opaque minerals. Textures of rocks are microgranular and fi eld and textural evidences show that the plutones are hypabyssal. In variation geochemical diagrams show two distinct fields and is categorized as monzonite (metalminous) and granite (peraluminous). Geochemical studies indicate that the nature of magma fr om these rocks located in calc-alkaline field and belongs to I-type granitoids of continen tal volcanic arcs. Iron mineralization with mainly composition of hematite occurred at the contact of masses and host pyroclastic and limestones rocks, along faults and fractures zones.
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References5
Middelmost E. A. k., Magma and magmatic rocks, An introduction to igneous petrology. Longman Group, 1985. Geology
Irvine T. N. and Baragar W. R. A., A gui de to the chemical classification of the common volcanic rocks. Canadian journal of earth sciences, 8, 523-548, 1971.
Shand S. J. Eruptive rocks, their genesis, composition, classification and their relation to deposite. Thomas Murby and Co. London, 488pp,1943.
Sun S. S. and McDonough W. F., Chemical and isotope systematics of oceanic basalts: implications for mantle composition and pr ocesses. In: Saunders A. D., Norry M. J. (eds) Magmatism in the ocean basins. Geo. Soc. Spec. Pub., 42, 313-345, 1989.
Pearce J. A., Sources and settings of granitic rocks. Episodes, 19, 120-125, 1996. Peridot gabbro Gabbro Gabbroic diorite Diorite Granodiorite Granite Syenite Quartz monzoniteMonzonite Monzo diorite Monzo- gabbro Foid gabbro Foid monzo- gabbro Foid monzo- syenite Foid syenite Foidolite Tawite/Urtite/Italite Quartzolite 40 50 60 70 80 90 0 5 10 15 Middlemost (1985) SiO2 Na2O + K2O Figure 1 Distribution of the samples in the nomenclature diagram for igneous rocks [1]. The Shaykhan granitoids plotted in quartzmonite and granite fields. AM F Tholeiite Series Calc-alkaline Series Figure 2 AFM diagram after [2]. Metaluminous Peraluminous Peralkaline 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 01234567 A/CNK-A/NK plot (Shand 1943) A/CNK A/NK Figure 3 Alumina saturation index [3] digram of Shaykhab granitoid. Figure 4 SiO 2 versus some major oxide and trace element variation plots for Shaykhab granitoid. Geology Figure 5 Primitive mantle-normalized spider diagrams of quartzmonzonite (a) and granite samples (b). Normalizing values are from [4]. Figure 6 Chondrite-normalized rare earth element patterns of quartzmonzonite (a) and granite (b) samples. Normalizing values are from [4]. 10 1000 Cs Rb Ba Th U Nb Ta K La Ce Pb Pr Sr P Nd Zr Sm Eu Ti Dy Y Yb Lu Rock/Primitive Mantle Sun+McDon. 1989 a 10 1000 Cs Rb Ba Th U Nb Ta K La Ce Pb Pr Sr P Nd Zr Sm Eu Ti Dy Y Yb Lu Rock/Primitive Mantle Sun+McDon. 1989 b 10 La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Rock/Chondrites Sun+McDon. 1989-REEs a 10 La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Rock/Chondrites Sun+McDon. 1989-REEs b
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