Document Type : Original Research Paper


1 Department of Geology, Faculty of Natural Science, Tabriz University, Tabriz, Iran

2 Department of Irrigation and Drainage, Faculty of Soil and Water, University of Zabol, Zabol, Iran

3 Department of Geology, Payam-e- Noor University, Ardabil, Iran


The studied area is located in southern part of the Torghabeh quadrangle, 90 km SE of Mashad city. The rocks of the investigated area are alkaline basalt and trachy andesite. The major minerals are plagioclase and pyroxene, minor amounts of olivine. The accessory minerals are rutile, titanite and apatite. The major texture is hiyalomicroporphyry. The nature of magma by various diagrams show that the generated magms are alkaline.The linear trends between Rb/Sr, K/Nb, in the rocks of the study area can show mixing of two sources from mantle astenosphere and lithosphere. Also positive anomaly of Pb and enrichment in LREE, in the studied samples may indicate crustal contamination. The low SiO2, high Mg and also negative Nb anomaly suggest strong role of crustal contamination in the petrogenesis of the studied rocks. The tectonic environment studies shows that these rocks are within plate basalts. Regarding the presence of coral fossil in the associated carbonate rocks and sand stone facies which belong to Devonian age it can be concluded that volcanic rocks of the study area are produed as a Caledonian eruption and shallow depth environment.


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