Original Research Paper
Investigation on Alam Chal Glacier Using Satellite Images

M. J. Valadan Zouj; Y. Rezaei; F. Vaziri; M.R. Mobasheri

Volume 18, Issue 70 , February 2009, Pages 2-13


  A considerable portion of potable water in Iran is supplied by natural glaciers, and then the study and protection of these resources are a necessity. This investigation includes the assessment of glacier parameters such as maximum and minimum altitude, area and perimeter, position of snow line and etc. ...  Read More

Original Research Paper
The Geometric and Kinematic Analysis of Soltan Anticline in Zagros Fold-Thrust Belt; An Evaluation of the Dehram Group Closure

A. Aflatounian; A. Yassaghi; A.H. Ahmadnia

Volume 18, Issue 70 , February 2009, Pages 14-27


         Soltan anticline is located in northwest of the Zagros fold-thrust belt in the LorestanProvince. Geometric and kinematic analyses of the anticline have been carried out to estimate the closure of the Dehram Group in order to evaluate its potential for gas reservoirs. Geometric ...  Read More

Original Research Paper
Biostratigraphy of the Shirgesht Formation in Kalmard Mountains in Southwest of Tabas with special Emphasis on Conodonts

A. Ghaderi; A. Aghanabati; B. Hamdi; A. Saeedi

Volume 18, Issue 70 , February 2009, Pages 28-37


  To study the Shirgesht Formation biostratigraphy in Kalmard Horst in relation to its conodont content, the Miyugodar (Miangodar) stratigraphic section was selected which is located in southwest of Tabas city. The Shirgesht Formation in the mentioned section is mainly composed of siliciclastic rock units ...  Read More

Original Research Paper
Study of Source Rock Composition and Reason of Layering in Jajarm Bauxite Deposit (North East of Iran) by using Geochemical Data

D. Esmaeily; A. Esna Ashari; H. Rahimpour Bonab

Volume 18, Issue 70 , February 2009, Pages 38-51


         Study of source rock materials in Jajarm bauxite deposit is the main subject of this study to show its origin. From bottom to top, this deposit consists of lower argillaceous layer, argillaceous bauxite, hard bauxite and upper kaolinite units. Correlation coefficients and scatter ...  Read More

Original Research Paper
The Plio-Quaternary Calc-Alkaline Magmatism in Azerbaijan (NW Iran) and Comparison with Similar Magmatism in Eastern Turkey

N. Amel; M. Moayyed; A. Ameri; M. Vosoghi Abedini; M.H. Emami; M. Moazzen

Volume 18, Issue 70 , February 2009, Pages 52-67


         The Plio-Quaternary calc-alkaline magmatism in Azerbaijan, northwest Iran, occurs as stratovolcanoes, lava flows and domes consisting of andesitic basalts, andesites, dacites, rhyodacites, and pyroclastic materials. The volcanic rocks unconformably cover the Miocene sedimentary ...  Read More

Original Research Paper
Interpretation of Paragenetic Sequence of Siliciclastic Sediments of Dahu Formation (Late Camberian), in E and SE Zarand, Kerman

R. Moussavi-Harami; A. Mahboubi; A. Kheradmand; H. Zandmoghadam

Volume 18, Issue 70 , February 2009, Pages 126-139


  For interpretation of paragenetic sequence and post depositional history of siliciclastic sediments of Dahu Formation (Late Camberian), two stratigraphy sections were measured at Dahuieh (type section) and Gazuieh in the NE and E of Zarand, with the thickness of 240 and 227 meters, respectively. The ...  Read More

Original Research Paper
Investigation of the Crustal Deformation in Iran Using Permanent GPS Station Time Series and Application of Noise Analysis

Sh. Roohi; Y. Jamour

Volume 18, Issue 70 , February 2009, Pages 76-83


     Today, one of the main objectives of the geodesy is to identify the changes over time at the surface of the earth. It is critical to the design of the infrastructures to know these changes and to be able to predict their trends with time, as any ignorance could lead to incompensable losses ...  Read More

Original Research Paper
Preliminary Results of Paleoseismologic Trenching along the Astaneh Fault

M. Shokri; M. Ghorashi; H. Nazari; R. Salamati; M. Talebian; J.-F. Ritz; H. Mohammad khani; M. Shahpasand zadeh

Volume 18, Issue 70 , February 2009, Pages 84-93


  The Astaneh fault with a length of more than 75 km is located in NW of Damghan. Morphotectonic investigation along the Astaneh fault and left - lateral displacement in quaternary deposits shows that, Astaneh is an active fault. It is necessary to recognize paleoseismicity of Astaneh fault because, this ...  Read More

Original Research Paper
Estimation of Attenuation Function for Shear Waves Phase in Lorestan Province by Using Darb-e-Astane Earthquake (2006) Acceleration Data

H. Rahimi; H. Hamzeh Lou

Volume 18, Issue 70 , February 2009, Pages 94-101


       In general, seismic attenuation is caused by a combination of both scattering and intrinsic mechanisms. Scattering redistributes wave energy within the medium but does not remove energy from the overall wave field. In contrast, intrinsic attenuation mechanisms convert wave energy ...  Read More

Original Research Paper
Balancing of Interpretation of Seismic Sections and its Application to Decrease the Errors in Seismic Interpretations:an Example from Iran

H. Sa’adatnia; A. Javaherian; I. Abdollahi Fard; M. R. Ghassemi

Volume 18, Issue 70 , February 2009, Pages 102-111


        One of the duties of seismic interpreter is interpretation of the geological structures likely to be found at deeper levels. Such constructions form a key to the understanding of regional tectonics and they often play a vital role in industry. The exploration for oil and gas in particular ...  Read More

Original Research Paper
An Introduction to Individual Disseminated-Veinlet and Vein Mineralization System of Cu (Pb- Zn) in the Chahmoosa-Gholekaftaran Mining District, Eastern Part of Toroud-Chahshirin Magmatic Arc

A. Imamjomeh; E. Rastad; F. Bouzari; N. Rashidnejad Omran

Volume 18, Issue 70 , February 2009, Pages 112-125


        ChahMoosa, Kalate ChahMoosa and GholeKaftaran mining districts are located in the Eastern part of Toroud-ChahShirin magmatic arc. Calc-alkaline subvolcanic bodies' of ChahMoosa porphyry biotite hornblende andesite, GholeKaftaran porphyry biotite hornblende dacite, equivalent to I ...  Read More

Original Research Paper
Crustal Velocity Model and Fault Mechanism of the Tabriz Strike-Slip Zone.

A. S. Moradi; M. Tatar; D. Hatzfeld; A. Paul

Volume 18, Issue 70 , February 2009, Pages 140-153


  The North Tabriz Fault (NTF) is an active fault which poses a high seismic hazard to the areas of NW Iran, especially the city of Tabriz with a population of 1.6 million. In order to determine the geometry and the kinematics of this fault system, a local dense seismological network including forthy 3-component ...  Read More

Original Research Paper
Mapping Hydrothermal Alteration Minerals and Silicic Parts Accompanied by Gold Mineralization using ASTER Data in Hired Area ( South of Birjand )

M. Alimohammadi; P. Behnia; A. Khakazad; M.A. Ghorbani

Volume 18, Issue 70 , February 2009, Pages 154-165


  Hired gold-bearing area is located to the northeast of the Lut zone and in the vicinity of the Sistan suture zone. Several post Eocene plutons have intruded into the Eocene volcanic and pyroclastic units and caused hydrothermal alteration and mineralization of gold, copper, lead and zinc. We have applied ...  Read More

Original Research Paper
The First Study of Bryozoans from the Geirud Formation in Central Alborz

M. Mohammadi; A. Ernst; M. Yazdi

Volume 18, Issue 70 , February 2009, Pages 166-173


       Two bryozoan species are described from the Geirud Formation (Upper Devonian) of Central Alborz. The Geirud Formation is a sequence of nearly 340 meters of alternating silisiclastics and limestone and 1-2 andesitic lava units, with extensive exposures in the Central Alborz mountains. ...  Read More

Original Research Paper
Sulfur, Carbon and Oxygen Isotope Variations of Sulfide and Carbonate in Arghash Gold Prospect, Southwest Neishabour, Northeastern Iran

E. Ashrafpour; K. M. Ansdell; S. Alirezaei

Volume 18, Issue 70 , February 2009, Pages 173-183


        Arghash gold district includes five gold-bearing vein systems, (Au-ItoAu-V) and one antimony-rich vein hosted by intermediate to silicic volcanic rocks, tuffs, granite, and diorite. Pyrite is the main sulfide mineral consisting of four generations (Py-ItoPy-IV). Py-I toIII are intimately ...  Read More