Document Type : Original Research Paper


1 Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran

2 Department of Geology, Islamic Azad University, Islamshahr Branch, Tehran, Iran

3 Department of Geology, Isfahan University, Isfahan, Iran.


Bouin– Miandasht Intrusive body is located in South- West of Golpayegan quadrangle and Sanandaj- Sirjan Zone. This Intrusion is composed of a compositional range including: porphyroid granite (monzogranite- syenogranite), granodiorite and gabbro – diorite. Variation diagrams of major and trace elements show a trend of continuous compositive spectrum and affinity in granite to granodiorite and noncontinuous spectrum and lack of affinity between gobbro- diorite with the former group. All samples are metaluminous and slightly peraluminous, and rich in K contents. On the basis of geochemical data, these rocks are I- type granites characterized by depletion in Ta, Nb, P, Ti and enrichment in Cs, K, Sr, Rb, Ba that are obvious in the multi-element spider diagrams. The enrichment in LILEs and depletion in HFSEs reveal I- type metalominous volcanic arc granitoid (VAG).Satellite images and geological evidences show that there are 2 main fault systems in Golpayegan region with two trends of NW-SE and NE- SW.


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