Original Research Paper
2. Ore Facies of Khanjar Pb– Ag (Zn) Carbonate– Hosted Deposit ,Upper Cretaceous Sequence in Central Iran, South Damghan, Iran

B. Mehri; E. Rastad; F. Fayyazi

Volume 19, Issue 75 , Winter 2010, Pages 3-12


  The Khanjar Pb– Ag (Zn) deposit is one of the stratabound deposits of Cretaceous age in Central Iran. The ore bodies may be grouped into two main geometric types: 1) Lenses of ore bodies congruent with bedding, 2) Ores as open space filling or with brecciate fabric due to faulting. Both types occur ...  Read More

Original Research Paper
3. The Study of Permian-Triassic Boundary in Esfeh Section N.E. Shahreza (Central Iran)

M.R. Partoazar

Volume 19, Issue 75 , Winter 2010, Pages 13-18


  The stratigraphic section of Esfeh is located at 15 km north-east of Shahreza and 65 km south of Esfahan. The aim of this study is to consider the lithostratigraphy, biostratigraphy and how to settle the Permian-Triassic boundary, also the geochronology of them. The biostratigraphic study of this section ...  Read More

Original Research Paper
4. Comparison of Seismic, Geologic and Geodetic Moment Rates in Central Alborz

M. Asadi sarshar; A. Bahroudi; M. Qorashi; M. R. Ghassemi

Volume 19, Issue 75 , Winter 2010, Pages 19-24


  Estimate of moment rate is comparatively reckoned as a new method for dealing with tectonic activities rate in different regions and it prepares the way for putting together different methods. In fact, moment rate states rate of energy which exists in deformation system. There are three different approaches ...  Read More

Original Research Paper
5. Biostratigraphy of the Abderaz Formation at Type Section Using Planktonic Foraminifera

M. Shafiee Ardestani; E. Ghasemi-Nejad; H. Vaziri Moghaddam

Volume 19, Issue 75 , Winter 2010, Pages 25-34


  In order to study the fossil contents of the Abderaz Formation for biostratigraphical purposes the 300 meters thick section was sampled at type section. The sequence is mainly made up of grey shales and marls with two units of chalky limestone in upper part. The lower contact of the formation with Aitamir ...  Read More

Original Research Paper
6. Focal Mechanism of December 20, 2007, Tabriz Earthquake Using Accelerograph Data

H. Hamzehloo; E. Farzanegan; H. Mirzaei

Volume 19, Issue 75 , Winter 2010, Pages 35-38


  The December 20, 2007 earthquake has occurred three months after the September  16, 2007 earthquake near the Tabriz city in East Azarbaijan province. We have used SH- waves accelerographs data and Brune model to estimate the causative fault plane parameters. The strike, dip and rake have been ...  Read More

Original Research Paper
7. Structural Analysis of Simin-Darreh Moradbeik Shear Zone,South of Hamedan

L. Izadi kian; A. Alavi; M. Mohajjel

Volume 19, Issue 75 , Winter 2010, Pages 39-46


  The Simin- Darreh Moradbeik shear zone is located in the south of Hamedan city with 5 km width and at least 10 km length. The portion of contact metamorphic rocks, plutonic rocks and migmatits are affected by this shear zone. At least three ductile deformation stages are recognized by folding and foliation ...  Read More

Original Research Paper
8. Calculation and Interpretation of Some Morphotectonic Indices Around the Torud Fault, South of Damghan

M. Khademi

Volume 19, Issue 75 , Winter 2010, Pages 47-56


  The only geologic evidence of the neotectonic activity of theTorud region is its seismisity which assumed to be related to the Torud seismogenic fault. This fault has been overlain by the Quaternary alluvium in the major part of its length. Therefore, the study of morphotectonical characteristics of ...  Read More

Original Research Paper
9. The ،Tectonic Geomorphology and Seismotectonics of the Ravar Fault Zone, South of Central Iran

A. Shafiei Bafti; M. Shahpasandzadeh

Volume 19, Issue 75 , Winter 2010, Pages 57-66


  According to potential of the intra-continental strike-slip faults for occurrence of large earthquakes, which are also considered as the main elements of active continental deformation, determination of their geometry and kinematics along with recognition of the active segments and temporal structural ...  Read More

Original Research Paper
10. Geomorphic Signatures of Active Tectonics in the Karaj Drainage Basin in South Central Alborz, N Iran

R. Khavari; M. Ghorashi; M. Arian; Kh. Khosrotehrani

Volume 19, Issue 75 , Winter 2010, Pages 67-74


  The paper presents a method for evaluating relative active tectonics based on geomorphic indices useful in evaluating morphology and topography. Indices used include: stream length-gradient index (SL), drainage basin asymmetry (Af), hypsometric integral (Hi), ratio of valley-floor width to valley height ...  Read More

Original Research Paper
11. Folding Style in Kermanshah Radiolarites and its Significance in Collision Tectonic of Northwest Iran

M. Mohajjel; M. Biralvand

Volume 19, Issue 75 , Winter 2010, Pages 75-82


  Abundant chevron folds were produced in well-bedded red thin layers radiolarites in Kermanshah area. Various fold hinge area structures were produced due to competency contrast and change of thickness in radiolarian shale and thick-bedded limestone intercalation in radiolarite sequence. Different styles ...  Read More

Original Research Paper
12. Application of SOM Neural Network for Numerical Tectonic Zoning: A New Approach for Tectonic Zoning of Iran

Ahmad Zamani; M. Nedaei

Volume 19, Issue 75 , Winter 2010, Pages 83-88


  One of the basic discussions in geosciences is construction of different tectonic zoning maps. In conventional tectonic zoning, not only the great amounts of subjective judgment are involved but also accurate interpretation of high-dimensional data is so difficult and out of human capability. To alleviate ...  Read More

Original Research Paper
13. Lithostratigraphy and Biostratigraphy of the Dalichai Formation (Middle Jurassic) in Parvar Area, North of Semnan, Central Alborz

M. Shams; K. Seyed-Emami

Volume 19, Issue 75 , Winter 2010, Pages 89-94


  The Dalichai Formation and its ammonite fauna is studied for the first time in the Parvar area, Central Alborz. At Parvar the Dalichai Formation, with a thickness of about 70 m, consist of an alternation of grayish silty marls, marlstones, marly limestone and limestone and is subdivided into 5 members. ...  Read More

Original Research Paper
14. Evaluation of Organic Geochemical Characteristics of Kangan Formation in South Pars Field

A. Rajabi-Harsini; M. Memariani

Volume 19, Issue 75 , Winter 2010, Pages 95-102


  In this study, in order to evaluate the geochemical characterization of Kangan Formation in well B in South Pars Gas Field, geochemical analysis (including preliminary and complementary analysis such as Rock-Eval Pyrolysis, extraction of organic matter (EOM), bitumen fractionation, Gas chromatography ...  Read More

Original Research Paper
15. The Environmental Impacts of Mining in Olang Area, Golestan Province (South Ramian)

N. Hafezi Moghaddas; G. A. Kazemi; H. R. Amiri Moghaddam; R. Sanchooli; F. S. Hejazi Nejad

Volume 19, Issue 75 , Winter 2010, Pages 103-108


  Olang Coal Mines in the Ghareh Chai watershed are located 100-130 km far from Gorgan and 20 km to the south of Ramian. In this research, the environmental impacts of these mines in this region including impacts on soil and water resources, slope instability and river bed erosion have been investigated. ...  Read More

Original Research Paper
16. Dynamic Fracture Process of Bam Earthquake

M. Eskandari; M. R. Gheitanchi

Volume 19, Issue 75 , Winter 2010, Pages 109-114


  In this article, we studied the dynamic fracture process of Bam earthquake. In two presented models stress heterogeneity on the fault plain was modeled as barrier or asperity and friction included as slip-weakening relationship. Results of models were constrained by near field ground motion recorded ...  Read More

Original Research Paper
17. Definition and Comparison Improved Mundry’s Integral with Mundry’s Integral on HEM Data Inverse Modeling

A.R. Arab-Amiri; A. Moradzadeh; D. Rajabi; B. Siemon; N. Fathianpour

Volume 19, Issue 75 , Winter 2010, Pages 115-118


  It is about 30 years that Helicopter electromagnetic (HEM) surveys are being used for rapid mineral and ground water exploration, environmental investigations and also geological mapping in extensive areas. Despite this, one of the most important problems in using obtained data from the surveys is accurate ...  Read More

Original Research Paper
18. The Study of Calcareous Nannofossils Correlation and Foraminifera Planktonic of Gurpi Formation in East of Behbahan

saeedeh senemari; L. Fazli; M. Omrani

Volume 19, Issue 75 , Winter 2010, Pages 119-126


  Nannofossils and foraminifera planktonic have been short range stratigraphy and spread vast geographical because of that two fossils groups can be used for subdividing biostratigraphy. According to this, and due to the lack of any correlational paleontological study, the nannofossils of Gurpi Formation ...  Read More

Original Research Paper
19. Modification of Anbalagan Method for Slide Hazard Zonation in Coastal Desert Area

M. Mahdavifar

Volume 19, Issue 75 , Winter 2010, Pages 127-132


  A new method is developed using modification of Anbalagan method (1992) for slide hazard zonation in coastal desert area. A region in the south of Iran is studied using the method, and the result is compared with the result of zonation using Anbalagan method. This comparison shows that the use of new ...  Read More

Original Research Paper
20. Petrogenesis of Chah Salar Granitoidic Pluton (SW of Neishabour)

M. Sadeghian; H. Ghasemi; Z. Farsi

Volume 19, Issue 75 , Winter 2010, Pages 133-150


  Chah Salar granitoidic pluton is located in the N of Chah-Salar village, SW of Neishabour, in the northern margin of structural Central Iran zone. This pluton intruded in Sabzevar ophiolitic Zone and based on the field observations, petrographical and geochemical classification diagrams, its lithological ...  Read More

Original Research Paper
21. Properties of Young Volcanic Rocks in southeast of Bijar

M. H. Razavi1; A. Sayyareh

Volume 19, Issue 75 , Winter 2010, Pages 151-156


  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 ...  Read More

Original Research Paper
22. Geochemical and Mass Changes at the Sar-Faryab Bauxite Deposit, Kohgeloye and Bovair-Ahmad Province: Using Al, Ti, Zr and Y Geochemical Characteristics

A. Zarasvandi; H. Zamanian; E. Hejazi; A.H. Mansour

Volume 19, Issue 75 , Winter 2010, Pages 157-164


  The Sar-Faryab bauxite deposit is located in 250 km east of Ahvaz city in  Kohgeloye and Bovair-Ahmad Province, Iran. Structurally the deposit is located in the Zagros Simply Fold Mountain Belt and was formed between the Ilam and Sarvak Formations. The bauxite horizon in this deposit consists of ...  Read More

Original Research Paper
23. Inverse Modeling of Magnetic Data Using Subspace Method

A. Nejati Kalateh; M. Mirzaei; N. Gouya; E. Shahin

Volume 19, Issue 75 , Winter 2010, Pages 165-174


  In this paper we used orthogonal basis functions and expansion coefficients for inverse modeling of magnetic data. The basis functions chosen are normalized eigenvectors of second derivation of the objective function (Hessian matrix) calculate for an initial model. Limited number of basis vectors obtained ...  Read More

Original Research Paper
24. Hydrocarbon Potential Evaluation and Depositional Environment of Sargelu Formation in Masjid-i-Soleiman Oilfield

B. Alizadeh; S. H. Hosseini

Volume 19, Issue 75 , Winter 2010, Pages 173-178


  Sargelu Formation is deeply buried and has limited distribution in Dezful Embayment (limited to the northern part), hence, investigation of petroleum potential of this formation has attracted many petroleum geologists. In this study, hydrocarbon potential of Sargelu Formation in Northern Dezful Embayment ...  Read More

Original Research Paper
25. Determination of Drilling Point using Fuzzy Logic in GIS Case Study: Now Chun Copper Prospect

G. R. Elyasi; M. Karimi; A. Bahroudi; A. Adeli Sarcheshme

Volume 19, Issue 75 , Winter 2010, Pages 179-188


  Piles of maps from different sources with varying scales and formats and different styles and absence of a proper solution for integrating vast amount of information has resulted in a complexity for preparing mineral potential map. Using GIS not only organizes the information related to mineral exploration ...  Read More