Volume 33 (2023)
Volume 32 (2022)
Volume 31 (2021)
Volume 30 (2020)
Volume 29 (2020)
Volume 28 (2019)
Volume 27 (2018)
Volume 26 (2017)
Volume 25 (2016)
Volume 24 (2015)
Volume 23 (2014)
Volume 22 (2013)
Volume 21 (2012)
Volume 20 (2011)
Volume 19 (2010)
Volume 18 (2009)
Volume 17 (2008)
Volume 16 (2007)
Geology, Mineralogy and Geochemistry of Bauxitic- Lateritic Horizon in the Deilaman- Eshkevarat Area, Central Alborz

M.R Omidvar Ashkalack; A Khakzad; N Nezafati; M.A.A Mokhtari; B Borna; S Rozbeh Kargar

Volume 23, Issue 92 , September 2014, , Pages 199-208


  The studied area is located in the western part of the Central Alborz structural zone and contains a bauxitic- lateritic horizon between the Elika and Shemshak formations. This horizon belongs to the middle Triassic, and croups out with E-W trend in the four regions (trends) including Zard Kuh- Loriteh, ...  Read More

A Fuzzy Model to Prediction of Shear Strength Parameters of Shemshak Formation Shales

M Kianpour; M Sayari; A Uromeihy; M.R Nikudel

Volume 23, Issue 89 , December 2013, , Pages 11-20


  Shear strength is one of the most important properties of mudrocks and shales in rock engineering and engineering geology. Because of the difficulty to obtain undisturbed samples of shales as required for determination of shear strength parameters, it is also the most difficult to evaluate. This research ...  Read More

A Fuzzy Model to Predict the Uniaxial Compressive Strength and the Modulus of Elasticity of Shemshak Formation Shales

M. Kianpour; M. Sayari; A. Oromiea

Volume 21, Issue 83 , December 2012, , Pages 103-110


  The uniaxial compressive strength and modulus of deformability of intact rocks are highly important parameters for rock engineering and engineering geology projects. Because of the difficulty of  measuring these parameters and the need for laboratory equipments for their prediction, indirect methods ...  Read More

The First Report of Two Gymnosperms Plant Macrofossil Species (Order Bennettitales) from Iran

J. Saadat Nejad

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


  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