PROPERTIES OF YOUNG VOLCANIC ROCKS IN SOUTHEAST OF BIJAR

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RAZAVI SEYED MOHAMMAD HOSSEIN; SAYAREH A.

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Journal: GEOSCIENCES Year:2010 | Volume:19 | Issue:75 Page(s): 151-156

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Title

PROPERTIES OF YOUNG VOLCANIC ROCKS IN SOUTHEAST OF BIJAR

Author(s)

RAZAVI SEYED MOHAMMAD HOSSEIN | SAYAREH A. | Issue Writer Certificate

Keywords

BIJARQ2

ALKALINE SERIESQ3

SANANDAJ-SIRJANQ2

CONTAMINATIONQ2

Abstract

In the south of BIJAR, north east of Sanandaj in the Kordestan Province, and in the SANANDAJ-SIRJAN structural zone, young volcanic rocks are present. In this area, rocks with Cretaceous, Oligocene, Miocene and Pliocene ages are also observed. Based on field observations, volcanic activities occurred during two main stages.In the first stage, eruption of pyroclastic material made a volcanic cone and a crater. In the next stage, lava erupted. Volcanic rocks are a combination of trachyandesite, andesite, andesite-basalt and basalt. In the magma poor in silica, presence of olivine and analcime and lack of orthopyroxene and pygeonite are the evidence of alkaline type magma series. Petrographical evidences such as the existence of gneiss xenoliths and quartz xenocrysts with reaction rims are the results of CONTAMINATION processes. In terms of geochemistry, the variations of Rb, Sr, Pb and Hf confirm this phenomenon as well. Based on low topography of volcanic rocks, suture zone, strike-slip faults, and petrologic evidence, low degrees of partial melting in source and crustal CONTAMINATION in the region, the magmatism occurred in a tensional tectonomagmatic environment. Local tension and opening along the strike-slip fault zone provided a way for ascending of magma to the earth surface.

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APA: Copy

RAZAVI, SEYED MOHAMMAD HOSSEIN, & SAYAREH, A.. (2010). PROPERTIES OF YOUNG VOLCANIC ROCKS IN SOUTHEAST OF BIJAR. GEOSCIENCES, 19(75), 151-156. SID. https://sid.ir/paper/31277/en

Vancouver: Copy

RAZAVI SEYED MOHAMMAD HOSSEIN, SAYAREH A.. PROPERTIES OF YOUNG VOLCANIC ROCKS IN SOUTHEAST OF BIJAR. GEOSCIENCES[Internet]. 2010;19(75):151-156. Available from: https://sid.ir/paper/31277/en

IEEE: Copy

SEYED MOHAMMAD HOSSEIN RAZAVI, and A. SAYAREH, “PROPERTIES OF YOUNG VOLCANIC ROCKS IN SOUTHEAST OF BIJAR,” GEOSCIENCES, vol. 19, no. 75, pp. 151–156, 2010, [Online]. Available: https://sid.ir/paper/31277/en

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