Original Research Paper
2. Partial Melting of Pelites and Semi-Pelites in the Kalaybar Thermal Aureole, NW Iran

M. Moazzen; R. Hajialioghli

Volume 16, Issue 64 , Winter 2007, Pages 2-13

http://dx.doi.org/10.22071/gsj.2008.58207

Abstract
         Intrusion of the Kalaybar nepheline syenite and nepheline gabbro into the Cretaceous pelitic and calcareous rocks during Eocene-Oligocene has caused the development of a thermal aureole up to 1 km thick. The contact between igneous and country rocks is sharp. The ...  Read More

Original Research Paper
3. Biostratigraphy of Calcareous Nannofossils of Gurpi Formation in North Gachsaran

F. Hadavi; K. Khosrow Tehrani; S. Senemari

Volume 16, Issue 64 , Winter 2007, Pages 14-23

http://dx.doi.org/10.22071/gsj.2008.58209

Abstract
  Nannofossils are good for biostratigraphy, since they are abundant, planktonic, rapidly evolving and largely cosmopolitan especially in the Late Cretaceous. With respect to this reality and due to the lack of any precise paleontological study, the nannofossils of Gourpi Formation were investigated in ...  Read More

Original Research Paper
4. The 2004 May 28 Firoozabad-Kojour (Iran) Earthquake, Ms 6.3, and its Aftershocks based on Recorded Data at Local Seismological Stations

M. Tatar; A. M. Farahbod

Volume 16, Issue 64 , Winter 2007, Pages 24-37

http://dx.doi.org/10.22071/gsj.2008.58211

Abstract
             A moderate earthquake (Ms=6.3) struck the coastal region of north of Iran and the central Alborz on 28 May, 2004 was responsible of several damages and about 35 casualties. The mainshock was followed by a large number of aftershocks, the largest ...  Read More

Original Research Paper
5. New Insight to Paleogeography and Structural Evolution of the Alborz in Tethyside

H. Nazari; J-F. Ritz; S. Oghbaee

Volume 16, Issue 64 , Winter 2007, Pages 38-53

http://dx.doi.org/10.22071/gsj.2008.58213

Abstract
  Development and evolution of Tethys basins during geological history from the Precambrian to Paleogene has been considered by many geoscientists.  The first sign of various basins propagation of Tethys which resulted in separation of supercontinents, ancient lands (such as Eurasia, Gondwana) and ...  Read More

Original Research Paper
6. Folding Style in Metamorphic Rocks of Faryab Area(South-East of Sanandaj-Sirjan Zone)

SH. Shafiei Bafti; S.A. Alavi; M. Mohajjel

Volume 16, Issue 64 , Winter 2007, Pages 54-73

http://dx.doi.org/10.22071/gsj.2008.58216

Abstract
       Faryab area at the southeastern part of the Sanandaj-Sirjan zone, containing the Paleozoic rocks in the internal part of Zagros Orogen, displays two folding episodes through a progressive deformation event. Axial planes of recumbent F1 folds dip moderately to the north and the ...  Read More

Original Research Paper
7. Morphotectonic Investigation of Kopeh-Dagh – Binalud Region based on Stream-Gradient Indices & Hypsometric Integral

N. Haghipour

Volume 16, Issue 64 , Winter 2007, Pages 74-87

http://dx.doi.org/10.22071/gsj.2008.58217

Abstract
          Folded and faulted Kopeh Dagh-Binalud belt in the northeast of Iran is a part of Eurasia and southern margin of Touran plate. What is now observed is the result of the latest Phase of Alpine folding. The morphology of the area is in early stage and its young ...  Read More

Original Research Paper
8. An Investigation on the Possibility of Two-Dimensional Joint Inversion of TE and TM Modes Data in Magnetotelluric (MT) Survey using Artificial Neural Network

A. Moradzadeh; F. Tahmasbi; M. Fateh

Volume 16, Issue 64 , Winter 2007, Pages 88-101

http://dx.doi.org/10.22071/gsj.2008.58218

Abstract
         The magnetotelluric (MT) method is a natural source electromagnetic geophysical technique, which is used mainly in petroleum, mineral and geothermal exploration. As in this method, the quantity of the measured data is bulky and have a complex structure, their modeling, ...  Read More

Original Research Paper
9. Optimally Uncertainty Estimation for Linear Inversion

A. Gholami; M. Javaherian

Volume 16, Issue 64 , Winter 2007, Pages 102-111

http://dx.doi.org/10.22071/gsj.2008.58219

Abstract
          In experimental sciences we often need to solve inverse problems. That is, we want to obtain information about the internal structure of a physical system from indirect noisy observations. Information about the errors in the observations is essential to solve ...  Read More

Original Research Paper
10. Structural Analysis of Mosha Fault in the Northeast of Tehran

S. Bahiraie; M. Abbasi; M. Almasian

Volume 16, Issue 64 , Winter 2007, Pages 112-125

http://dx.doi.org/10.22071/gsj.2008.58220

Abstract
  Generally the most important factor in the structural evolution of Alborz is thrust and reverse faulting that often has an east-west trend, parallel to the mountain chain. Mosha fault, one of the main faults, in this study covers the area between longitudes 51˚, 30´ to 51˚, 45´ including ...  Read More

Original Research Paper
11. Study of Planktonic Foraminifera and Biozonation in Abderaz Formation

L. Bakhshandeh; A. Aghanabati; F. Keshani; T. Mohtat

Volume 16, Issue 64 , Winter 2007, Pages 126-135

http://dx.doi.org/10.22071/gsj.2008.58221

Abstract
       To revise the Abderaz Formation in Koppeh-Dagh basin, its type section was studied considering stratigraphical properties. The main lithology of Abderaz Formation includes gray to blue shale with a thickness of 286.86 meters. This Formation has an attitude of N 45˚ W and 80˚ ...  Read More

Original Research Paper
12. Variation of Moho Depth in the Central Alborz

A. H. Rajaee; M. Mokhtari; K. Priestley; D. Hatsfeld

Volume 16, Issue 64 , Winter 2007, Pages 136-147

http://dx.doi.org/10.22071/gsj.2008.58230

Abstract
  Using teleseismic body waves, this paper presents the crustal and lithospheric structure in the central part of the AlborzMountains for the first time. The region has been known as a very active and seismogenic locations in the past, characterized by strong earthquakes and complex structures. Tehran, ...  Read More

Original Research Paper
13. Potential of Hydrocarbon Generation of Pabdeh and Gurpi Formations on the Basis of ∆LogR and Neural Network Techniques in Wells A and B in an Oil Field in the South-West Iran

M. Paryab

Volume 16, Issue 64 , Winter 2007, Pages 148-157

http://dx.doi.org/10.22071/gsj.2008.58231

Abstract
  Hydrocarbon source rocks, the subject of various analyses and investigations, are well appreciated because of their capacity for oil generation. In the present study, attempts were made to evaluate source rock using a leap cost analytical method. For this purpose, some samples from these formations were ...  Read More

Original Research Paper
14. The First Report of Two Gymnosperms Plant Macrofossil Species (Order Bennettitales) from Iran

J. Saadat Nejad

Volume 16, Issue 64 , Winter 2007, Pages 158-165

http://dx.doi.org/10.22071/gsj.2008.58232

Abstract
  Investigation on plant macrofossils of the Jurassic sediments of Shemshak Formation in Eshkevarat-e-Olia area has been resulted in introducing two species, consisting of Ptilophyllum sahnii and Ptilophyllum sakrigaliensis. Thesespecies belong to Phylum Cycadophyta and order Bennettitales. The above mentioned ...  Read More

Original Research Paper
15. Magmatic Evolution in Quaternary Basaltic Rocks in Ghorveh – Takab Axis

S. Malecootyan; Sh. Hagh-Nazar; M. Ghorbani; M. H Emami

Volume 16, Issue 64 , Winter 2007, Pages 166-178

http://dx.doi.org/10.22071/gsj.2008.58267

Abstract
       Petrological,geochemical and isotropic evidence of crustal contamination of the Quaternary basic rocks of Ghorveh-Takab axis is presented in this paper. These rocks are olivine basalt and basalt and they are plotted in the field of alkaline suites in geochemical diagrams. Some ...  Read More

Original Research Paper
16. The Role of Earthquake and the Historical Events in Devastation of the City of Shadyakh

A. Kangi; A. Rastgou; F. Ebrahimi; N. Kangi

Volume 16, Issue 64 , Winter 2007, Pages 179-185

http://dx.doi.org/10.22071/gsj.2008.58268

Abstract
  Shadyakh, commonly deemed as the headquarters of NeishabourCity, has so far endured such various events as war, earthquake, and other natural disasters. What has been revealed through recent archeological excavations convincingly depicts a brilliant scientific, cultural, and political manifestation of ...  Read More