Abstract
The study area is located in Lavasanat District in the northeast of Tehran in Central Alborz zone. The outcrops are mainly linked to Karaj Formation, which belongs to the upper Eocene to Oligocene periods. In the study area, there are various plutonic rocks that are identified in the form of numerous dike and sill on the ground. These sills are injected in between sedimentary layers. The rocks forming the sills include the spectrum of gabbro, gabbro diorite, diorite, monzonite, and syenite. In some areas, these rocks have undergone alterations and have traces of the saussuritization and chloritization phenomena. There are also two generations of amorphous. The first generation is fully chloritized due to alteration while the second generation is unaltered. Unlike many diorites and monzonites, which typically have hornblendes, the neutral rocks such as diorite and monzonite lack hornblendes. Hence, their magmas were dry and dehydrated. Based on the geochemical studies conducted on 17 samples (15 sill samples and 2 host rock samples) and the diagrams of the tectonic settings of rocks, the study sills are in the WIN (within plate). However, two samples of the host rock are within the range of the active continental margins.
Highlights
Alborz Mountain Range, which is in the north of Iran with a length of approximately 900km and a width of approximately 100km, shows an active deformation in the southern bank of the Caspian Sea
Based on the geochemical studies conducted on 17 samples (15 sill samples and 2 host rock samples) and the diagrams of the tectonic settings of rocks, the study sills are in the WIN
Two samples of the host rock are within the range of the active continental margins
Summary
Alborz Mountain Range, which is in the north of Iran with a length of approximately 900km and a width of approximately 100km, shows an active deformation in the southern bank of the Caspian Sea. The study region has a surface area of 337km and it is located at a distance of approximately 10km from the east of Tehran in the north of Jajroud. The study area is a part of the Central Alborz zone, and the Karaj Formation has the highest number of outcrops It consists of two intrusions: one in the north and one in the northeast of Lavasan. The intrusions in Lavasanat region are generally a combination of a spectrum of gabbro to syenite and neutral rocks and they are placed in between the sediments. These intrusions are observed in the sill and dike forms.
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