Report on systematic geochemical exploration of 1:100000 sheet of Shakran
The 1:100000 sheet of Shakran is located between the boundaries of three Qazvin, Tehran and Mazandaran provinces, and between 50°30' to 51° Eastern longitudes and 36° to 36°30' northern latitudes. Most part of this sheet is located in the Alborz structural zone and a small southern portion of it belongs to the Sabzevar-Saven zone. Folds and faults in the region are abundant and have E-W trend. Outcropped rock units in the area include shale and clastic deposits of Kahar, Laloun sandstone, Soltaniyeh dolomite, Top Quartzite, Mila, Cambrian-Ordovician graptolite-bearing shales, basic magmas with clastic deposits of Jeroud, Mobarak limestone of lower Carboniferous, Permian Doroud, Ruteh and Nesan carbonate rocks, Jurassic Shemshak and Lar deposits, tuff and basic magmatic rocks of Karaj and Pleistocene gravels. Intrusive rocks in the area include monzonite, granodiorite and loco-granite, olivine lenses and sometimes lamprophyres that caused the contact metamorphism in Hornblende-hornfels facies.
Mineral resource of the area are mostly non metallic and include coal, barite, and gypsum and sometimes copper mineralization (in Parachan lavas), lead, manganese, magnetite in hydrothermal hallows of Alamkouh pluton, Precambrian metamorphic rocks, quartzite of Paleozoic and acidic tuff of Paleogene.
In this survey 615 samples taken and analyzed for 43 elements. Of these samples, 74 ones were mono-rock, 102 ones two-rock, 108 ones three-rock, 89 ones four-rock and 154 ones were more than four-rock samples.
Most sensibility is for cobalt with 480 credits (maximum in basic rocks and minimum in carbonate rocks) followed by copper (87 credits), nickel (65), rubidium (60), strontium (30.5), and scandium (30). Least variation is for Yttrium (1.9).
For processing the data, at first censored data were replaced and then required analyses run on the data. The geochemical assessments led to identification of several anomalies with various priorities.
Below table shows the number of first grade identified anomalies per elements.