Document Type : Original Research Paper
1 Islamic Azad University, Science and Research Branch, Tehran, Iran
2 Islamic Azad University, Lahijan, Iran
3 Shahid Beheshti University, Tehran, Iran
4 Geological Survey of Iran, Tehran, Iran
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 evidence, such as the presence of gneissic xenoliths, quartz xenocrysts with reaction rims and biotite phenoblasts in the basic rocks of the study area and high amount of potassium and high values of ratios, high concentration of LREE in comparison with HREE, high values of ratios and low values of ratios all indicate the crustal contamination of basic magma during its ascent.