Abstract
In many parts of the world, data obtained from geochemical exploration of stream sediments are integrated with geological and geophysical data as one of the most efficient methods of exploring potential deposits at regional and semi-detailed scales. The aim of regional investigation is to study large areas to identify anomalies that might have been arisen from increased concentrations of an element or some elements in a region. A total of 78 geochemical samples were taken from Varamin sheet to identify regions of anomalies. The following information was used to perform a detailed geochemical exploration, in particular for geochemical sampling. 1) 1:100,000 geological map of Varamin. 2) 1:50,000 topographic maps of the region. 3) 1:100,000 airborne geophysical map of the region to locate shallow intrusions and hidden faults. The sampling network was designed using the above data and the analysis of 1:500,000 topographic maps. The sampling density was higher around faults and apparent and hidden intrusions, and lower in plains and lowlands.
Highlights
The 1:100,000 map of Varamin includes southeast of Tehran province with eastern longitudes of 30 ̊51'51" and northern latitudes of 30 ̊35'35"
Due to the low number of elements due to the low amount of data that are not considered as geochemical anomalies (Zn, Ba, Sr), simple univariate studies were conducted in Varamin sheet on the basis of averages (X) and standard deviation (Stdev)
Using this exploration logic in the 1:100,000 Varamin sheet, a total of 14 heavy mineral sampling stations were selected in addition to the designed geochemical samples
Summary
The 1:100,000 map of Varamin includes southeast of Tehran province with eastern longitudes of 30 ̊51'51" and northern latitudes of 30 ̊35'35". Varamin is one of the cities in Tehran province and is limited to Damavand and Shemiranat from north, Tehran and Rey from west, Qom from south and Varamin from east. Varamin consists of three towns including Varamin, Pishva and Gharchak. The central part of the city is plain, the southern part is desert and the northern part is limited to southern highlands of the Alborz mountain range. Ghareaghaj Highlands are located 25 km from northeast of Varamin. Among the other mountains of this region are, Mount Gach near Pishva Village, Mount Sorkh, Siyahkuh on the south of Varamin sheet, Mount Makresh, Mount Sharifeh, Mount Gorgan, Mount Hajiha, Mount Dahaneh, Mount Koolik, Mount Dogoosh, and Mount Hamamak. Varamin has a mild and dry climate, but the southern part has a warm and dry climate due to being located on the edge of a desert
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