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Introduction of Ophiolitic Complex Rock Series in the 1:100,000 Sheet of Mianrahan (West of Iran)

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Open Journal of Marine Science 2016年第4期6卷 538-546页

作者： Hamideh Farahmand mohammad ali arian Department of Geology Faculty of Science North Tehran Branch Islamic Azad University Tehran Iran

The Mianrahan’s ophiolitic complex out crops in the northeast of Kermanshah and along with the Zagros thrust zone. In Mianrahan sheet, these ophiolites are located along the NW-SE and parallel to the Zagros Thrust in the ground. The rocks of this ophiolite complex consist of peridotite, serpentinites, gabbro, dolerite dykes, basaltic lavas associated with marine sediments containing the cretaceous limestones, siliceous limestones and radiolarites. Stratification of this ophiolitic complex is similar to lithological facies sequence of the oceanic crust. However, in some parts, it could be seen as scattered and melanged in the ground. Petrographic study of Mianrahan’s ophiolitic complex started with the ultramafic sequence and followed by sedimentary rocks.

关键词： Mianrahan Kermanshah Zagros Thrust Ophiolitic Complex

Petrogenesis of Volcanic Rocks in Alasht, Mazandaran, Iran

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Open Journal of Geology 2016年第3期6卷 131-145页

作者： mohammad ali arian mohammad Hasan Bazoobandi Reza Elmi Department of Geology Faculty of Sciences North Tehran Branch Islamic Azad University Tehran Iran Faculty of Science Shahid Sherafat University of Farhangian Tehran Iran

Area studied in this paper is located in the northwest of city of Alasht. The most important varieties of studied rocks are volcanic and semi-volcanic rocks of basic nature. These rocks, which form a distinguishable solid mass on 1:100,000 geological map, belong to Cretaceous period. According to results of petrographic study, rocks of this area include olivine basalt, dolerite, gabbro and microgabbro, and all have almost similar chemical compositions. According to chemistry-based naming process carried out through TAS method, these rocks are entirely basalt and basic and are all products of Sub-alkaline-Tholeiitic magma. According to Harker diagrams, a magmatic differentiation can be observed in all volcanic rocks;furthermore, basaltic magma erupted in this area has undergone an alteration and possibly a crustal contamination. The spider diagrams plotted in this paper show that basic rocks of Alasht area (basalts, andesite basalts, dolerites, gabbros and microgabbros) are all mostly similar to ocean island basalts (OIB). Once field study, sampling and microscopic study stages were complete, ten samples were selected for chemical analysis and were analyzed by XRF method.

关键词： Alasht Area Crustal Contamination Olivine Basalt Sub-Alkaline

Petrology and Geochemistry of Dikes in the North of Saveh in Iran

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Open Journal of Marine Science 2016年第2期6卷 210-222页

作者： mohammad-Hassan Bazoobandi mohammad-ali arian mohammad-Hashem Emami Gholamreza Tajbakhsh Abdollah Yazdi Department of Geology Faculty of Science North Tehran Branch Islamic Azad University Tehran Iran Department of Geology Faculty of Science Islamshahr Branch Islamic Azad University Tehran Iran Department of Geology Faculty of Science Yazd University Yazd Iran Department of Geology Faculty of Science Kahnooj Branch Islamic Azad University Kerman Iran

Dikes in the north of Saveh are located in a region with an area of approximately 200 square kilometers, in a distance of approximately 100 kilometers south of Tehran. Dikes mentioned in terms of petrological composition, are divided into two categories: alkaline and intermediate to acidic. Alkaline dikes include: andesitic basalt and andesite and intermediate to acidic dikes include: trachyte and trachyandesite. In terms of geochemical, dikes in the north of Saveh have a dual nature of alkaline and calc-alkaline. Both groups are derived from more enrichment source than primitive mantle. Despite similarity of pattern of both groups, varieties of alkaline having less silica, in the elements Sr, Ti, Nb and Ta show more enrichment and in the elements Hf, Rb, Th, K show less enrichment than varieties of calc-alkaline.

关键词： Swarm Dikes Alkaline and Calc-Alkaline Saveh Iran

Petrology and Geochemistry of Igneous Rocks in Zarinkamar Area, NE of Shahrood, Iran

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Open Journal of Geology 2017年第3期7卷 348-359页

作者： Ebrahim Nazemi mohammad ali arian Abdoreza Jafarian Mohsen Porkermani Department of Geology Faculty of Science North Tehran Branch Islamic Azad University Tehran Iran Department of Geology Islamic Azad University Shahrood Branch Shahrood Iran

Zarinkamar area is located in northeast of Shahrood, northeast of Iran, between latitudes of 36°37’ - 36°42’ and longitudes of 55°07’ - 55°12’. Different types of igneous rocks have an outcrop on the region. Intrusive igneous rocks include a type of syenite with aegirine pyroxene and the other includes quartz from 5 to 20 percent. Moreover, aegirine syenite, ordinary syenite, and quartz syenite have been injected into Karaj Formation with an age of middle to early Eocene. Also, some parts of trachyte magma have given rise to produce trachyte outcrops after passing the crust and current flows. Studying major and rare elements shows that a magma separation has been caused by separation smelting or a crystal separation. These magmas are alkaline and shoshonites and they have been originated in a continental rift. The magma of Zarinkamar region has been combined with acidic continent crust as it rose to the surface. High amount of Th, and Rb and low amount of Ti, P, Sr, and Ba can prove this hypothesis.

关键词： Zarinkamar Sharood Syenite Trachyte

Petrogenesis and Metallogenesis of Malek Siah Kuh Adakite-Like Rocks and Associated Hydrothermal Mineralization (Sistan Area, Iran)

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Open Journal of Geology 2017年第11期7卷 1670-1689页

作者： Mohsen Javan Khosh Kholgh Morteza Razmara mohammad ali arian Department of Geology Faculty of Science North Tehran Branch Islamic Azad University Tehran Iran Department of Geology Ferdowsi University of Mashhad Mashhad Iran

The granitoids-diroretic complex and associated volcanic suits of Malek Siah Kuh (eastern Iran) were examined by RS, XRD, XRF, AAS and ICP-MS methods. The Multispectral data were used for differentiating of lithological units, main alterations, structural trends, and hydrothermally altered minerals. Based on the results of remote sensing, field studies and petrographic data, the complex classified into three main groups: 1) mafic unit (gabbro-basalt), 2) intermediate rocks (diorite-andesite suite) and 3) felsic unit (granitoide rocks). The complex is characterized by high Al2O3 and Sr contents as well as high Sr/Y and La/Yb ratios, while low in Y and Yb contents. The geochemical characteristics of these rocks indicate that they are similar to adakite like rocks. The complex is high calc-alkaline to shoshonitic nature. The results indicated derivation from similar silicate melt source followed by differentiation and assimilation of crustal rocks. Based on set of petrological and geochemical relations, 3 distinct stages of mineralization process can be recognized. 1) It is differentiation during magma evolution as well as metal enrichment and subsolidus leaching by hot fluids. 2) It occurred by ascending of the gas-rich magma and release of S and As. 3) It was accompanied by hydrothermal activities leading to the generation of sulfidation and associated polymetallic (Cu, Au, Fe) mineralization.

关键词： Malek Siah Kuh Igneous Complex Differentiation Assimilation

Petrology of Intrusive Bodies of Azizabad-Tinamo Area in the South of Songour, Iran

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Open Journal of Geology 2016年第12期6卷 1567-1579页

作者： Siavash Gholizadeh mohammad-ali arian Mahammad-Reza Jafari Abdollah Yazdi Department of Geology Faculty of Sciences North Tehran Branch Islamic Azad University Tehran Iran Department of Geology Kahnooj Branch Islamic Azad University Kerman Iran

In terms of structural divisions of the Iran’s earth crust, the studied area is considered as a part of the Sanandaj-Sirjan structural zone and Zagros Thrust. In this area, there are two gabbroic-dioritic and syenitic igneous intrusive bodies. The host rocks of these intrusive bodies are upper Cretaceous limestones and formed by contactmetamorphism at the contact zone between hornfels rocks and skarn. Field and geochemical datasets represent that all various rocks within these intrusive bodies have been originated from the same magma. The process of fractional crystallization and probably a small amount of contamination and assimilation has also played a role in the evolution of parent magma. Generally, these magmas are sub-alkaline and lie in themagmatic range of tholeiitic and calc-alkaline series. Samples investigated are metaluminous and peralkaline.

关键词： Syeniteintrusive Bodies Gabbro-Diorite and Granite Sub-Alkaline Metaluminous

Geochemistry and Petrogenesis of Tertiary Volcanic Rocks of the Eastern Roodbar, Alborz Mountain, North of Iran

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Open Journal of Geology 2016年第10期6卷 1296-1311页

作者： Zahra Shafeie mohammad ali arian Shahrouz Haghnazar Mansour Vossoughi Abedini Department of Geology Faculty of Science North Tehran Branch Islamic Azad University Tehran Iran Department of Geology Faculty of Science Lahijan Branch Islamic Azad University Lahijan Iran Department of Geology Faculty of Science Science and Research Branch Islamic Azad University Tehran Iran

In the Alborz Mountains of the eastern Roodbar (north of Iran), Tertiary volcanic rocks have a variety of composition between olivine basalt, basaltic andesite, pyroxene andesite and andesite. The presence of different xenoliths and xenocrysts is among the evidence of crustal contamination of these rocks. The positive correlations of CaO/Al2O3 vs to MgO and Al2O3 vs. SiO2 are of signs of the olivine and clinopyroxene fractionation in the variation trend of the area rocks. Positive correlations K2O/P2O5 vs with SiO2 and La/Sm vs. K2O/P2O5 demonstrate contamination of magma with the continental crust. The incompatible trace element patterns and their comparison with crustal contents indicate contamination of the rocks of the area with the lower and upper continental crust. Linear trends in the variation diagram of Nb/Y vs. Zr/Y, introduce two different source regions: a MORB source and the other continental crust for the rocks which are the genesis. The variations of Y/Nb vs. Zr/Nb and Rb/Y vs. Nb/Y reveal a crustal contamination of the magma originated from the MORB source. Geochemical studies represent that the area’s rocks were derived from the 15% melting of a mantle source of MORB type with spinel facies within a continental environment, which was contaminated by varying degrees of continental crustal rocks.

关键词： Volcanic Rocks Tertiary MORB Source Mantle Crustal Contamination

Geodynamics of Dikes in North of Saveh

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Open Journal of Ecology 2015年第9期5卷 452-459页

作者： mohammad-Hasan Bazoobandi mohammad-ali arian mohammad-Hashem Emami Gholam-Reza Tajbakhsh Abdollah Yazdi Department of Geology Faculty of Science North Tehran Branch Islamic Azad University Tehran Iran Department of Geology Faculty of Science Islamshahr Branch Islamic Azad University Tehran Iran Department of Geology Faculty of Science Yazd University Yazd Iran Department of Geology Faculty of Science Kahnooj Branch Islamic Azad University Kerman Iran

Dikes can be divided into sheeted, feeder, cone and swarm types based on the origin and the formation. A group of dikes that are formed in dense in a relatively broad zone influenced by a particular tectonic regime are referred to as swarm dikes. Swarm dikes have numerous applications such as locating mantle plume centers, determining areas of longstanding tensions and detection of deformation networks. The purpose of this article is classified swarm dikes of “North of Saveh” based on previous studies. In one study, swarm dikes are classified based on their initial geometry into five types of I, II, III, IV and V. According to this classification, our study has been shown that the dikes in north of Saveh are of type IV. In another study, the swarm dikes are classified into three types: parallel, large radial and small radial. According to the classification, our study has been shown that the dikes of North Saveh are parallel that have arisen by tensions caused by the collision of the Arabian plate and the Central Iran plate. In addition to original tensions in the region, local faults have been effective on the arrangement and the establishment of dikes.

关键词： Swarm Dikes Locating Mantle Plume Dikes in North of Saveh Dikes Classification

Geological and Geotourism Study of Iran Geology Natural Museum, Hormoz Island

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Open Journal of Ecology 2014年第11期4卷 703-714页

作者： Abdollah Yazdi mohammad ali arian Mahmoud M. Rezapour Tabari Department of Engineering Shahrekord University Shahrekord Iran Department of Geology Kahnooj Branch Islamic Azad University Kerman Iran Department of Geology North Tehran Branch Islamic Azad University Tehran Iran

Iran is a country that benefits from nice nature, diverse continent, areas full of unique geological phenomena. Thus, it is necessary to study these attractions for better recognition of them. In this regard, Hormoz Island with valuable geoheritage, biodiversity, cultural, historical and political diversity is very important. The accumulation of these attractions and its being located in Persian Gulf strategic area made it of considerable significance in national and international communities. Hormoz Island is a spherical salt dome which is located in Hormoz strait. This Island is composed of evaporites, igneous rocks and sedimentary rocks, and sediments mainly belong to Mishan and Aghajari formations and salt, gypsum and, to a lesser extent, limestone evaporites. In sedimentary formations of Hormoz, Aouthigenic minerals such as Pyrite, Dolomite, quartz, Anhydrite, gypsum and halite are frequently seen. Mineralization of volcanic leads to formation of high temperature minerals, such as oligiste, pyroxene, amphibole and low temperature and hydrothermal minerals such as Pyrite, quartz... in the tracks of igneous rocks. This unique geodiversity in rocks and mineral which made various colors in Hormoz Island made it a mineraogical reservoir. Beside considerable mineralogical attractions, there are other potentials like ochre mine, coral reefs, rock seashore, sea caves, salt caves, plant cover and wild life which have added to various tourism capabilities of this Island and made it a unique place in the world. This paper studies Hormoz Island in terms of geological features and geotourism potentials.

关键词： Salt dome Geology Geodiversity Geotourism Hormoz Island Iran