| Petrology of Igneous Rocks in Northern Golpayegan, Iran |
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| 作者姓名： | Mohammad Ebrahimi |
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| 作者单位： | Mohammad Ebrahimi Mohammad Reza HosseinNejad Faculty of Earth Sciences，China University of Geosciences，Wuhan 430074 |
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| 基金项目： | the University of Tehran，， |
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| 摘 要： | ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｓｔｕｄｉｅｄａｒｅａｉｓｌｏｃａｔｅｄｉｎｔｈｅｎｏｒｔｈｏｆＧｏｌｐａｙｅｇａｎ，Ｉｒａｎ，ｂｏｕｎｄｅｄｂｙｌａｔｉｔｕｄｅｓ３３．３１°Ｎａｎｄ３３．３７°Ｎａｎｄｌｏｎｇｉ－ｔｕｄｅｓ５０．１１°Ｅａｎｄ５０．...
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| 关 键 词： | S-type granite volcanic rocks syenite |
Petrology of Igneous Rocks in Northern Golpayegan, Iran |
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| Mohammad Ebrahimi.Petrology of Igneous Rocks in Northern Golpayegan, Iran[J].Journal of China University of Geosciences,1998,9(1):2. |
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| Authors: | Mohammad Ebrahimi Mohammad Reza HosseinNejad |
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| Abstract: | A preliminary study on petrological features of igneous rocks was carried out in northern Golpayegan, Iran, in an area of about 60 km 2. According to the limited available data the sequence of the magma activity could be considered as follows: (1) Precambrian (?) granite connected with a continental continental collision event, (2) Precambrian (?) syenite emplaced at a post continental continental collision environment, (3) Cretaceous volcanic rocks generated by a local extensional system at an active continental margin and (4) Cenozoic doleritic veins generated in a post collision event. Geochemical characteristics of the granitic intrusion show that it originated from crust and belongs to S type one. Syenitic body consists of syenitic affinities ranging from alkali syenite to syenodiorite. These rocks were cut by Cenozoic doleritic veins, which consist of dolerite and olivine dolerite. Both syenite and dolerite are thought to originate from upper mantle but their ages are different. Cretaceous volcanic rocks include basalt, andesite, trachyandesite, trachyte and tuff. They are compositionally alkaline and erupted in a shallow graben basin. Their eruption has been in connection with deep seated faults, which brought out the magma from the source. |
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| Keywords: | S-type granite volcanic rocks syenite dolerite Golpayegan Iran |
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