PETROLOGICAL STUDIES ON NEOGEN MAGMATIC ROCKS IN TUDASHAK AREA, SOUTHWEST NAIN, CENTRAL IRAN

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KHEIRKHAH MONIREH

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Journal: GEOSCIENCES Year:2013 | Volume: | Issue: Page(s): 60-71

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Title

PETROLOGICAL STUDIES ON NEOGEN MAGMATIC ROCKS IN TUDASHAK AREA, SOUTHWEST NAIN, CENTRAL IRAN

Author(s)

KHEIRKHAH MONIREH | Issue Writer Certificate

Keywords

TUDESHAKQ4

CENTRAL IRANQ2

NEOGENEQ2

OLIVIN BASALTSQ2

LAHARQ4

DACITEQ2

MIXINGQ4

DEPLETED MANTLEQ4

SUBALKALINE MAGMAQ4

Abstract

The Tudeshk area in southeastern part of Nain, CENTRAL IRAN is located in Urmiyeh- Dokhtar magmatic belt and is a part of Kajan 1:100000 map of GSI.The stratigraphic sequnce is composed of Mesozoic and Cenozoic strata, consisting of Cretaceous limestone, Tertiary volcanic rocks (Iavas and pyroclastics) and also Quaternary deposits.The NEOGENE section is indicated by Upper Red Formation (URF), and a dacitic (Ng d), unit. The rock type variations in NEOGENE volconics along with the geochemical and petrographic evidences indicate a kind of sodic character. MIXING and fractional crystalization in magmas, are important, phenomena which has been resulted in this study.Along with the above processes, the associated basic rocks have been strongly altered, caused by fluid pressures, high temperatures and the nature of late fumarolic fluids. This area has been subjected to a fault and fracture system with a NW-SW trend, indicates that the area has passed a brittle type tectonic regime, which follows the main trend of Urmiyeh-Dkhtar magmatic belt. This kind of extensional tectonic regime controlled the emplacement of igneous rocks The geochemical characteristics of basalts in Tudashak area (drown as spider diagrams in special cases) has been compared with the basaltic rock-typs in orther places of the world as: Parana (South America), Rio Grande (North America), Deccan (India) and Ethiopia. All of analyis results plot in sub alkaline field of diagram, indicating contamination with amphibolites gneisses of sialic crust during the initial stages of ascending. Similarity with the Tudashak NEOGENE basalts shows a considerable similarity with the Rio Grande Basalts and forms this point of view. It could be deduced that the partial melting of a DEPLETED MANTLE is responsible for the formation of this basalts, and has a similarity to the steans Basalts of North America Basin and Range.

Cites

COMPOSITION AND ORIGIN OF AEOLIAN AND FLUVIAL SANDS OF GAVKHUNI PLAYA LAKE (SOUTHEAST OF ISFAHAN)

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APA: Copy

KHEIRKHAH, MONIREH. (2001). PETROLOGICAL STUDIES ON NEOGEN MAGMATIC ROCKS IN TUDASHAK AREA, SOUTHWEST NAIN, CENTRAL IRAN. GEOSCIENCES, 9(37-38), 60-71. SID. https://sid.ir/paper/392347/en

Vancouver: Copy

KHEIRKHAH MONIREH. PETROLOGICAL STUDIES ON NEOGEN MAGMATIC ROCKS IN TUDASHAK AREA, SOUTHWEST NAIN, CENTRAL IRAN. GEOSCIENCES[Internet]. 2001;9(37-38):60-71. Available from: https://sid.ir/paper/392347/en

IEEE: Copy

MONIREH KHEIRKHAH, “PETROLOGICAL STUDIES ON NEOGEN MAGMATIC ROCKS IN TUDASHAK AREA, SOUTHWEST NAIN, CENTRAL IRAN,” GEOSCIENCES, vol. 9, no. 37-38, pp. 60–71, 2001, [Online]. Available: https://sid.ir/paper/392347/en

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