Abstract
Area studied in this paper is located in the northwest of city of Alasht. The most important varieties of studied rocks are volcanic and semi-volcanic rocks of basic nature. These rocks, which form a distinguishable solid mass on 1:100,000 geological map, belong to Cretaceous period. According to results of petrographic study, rocks of this area include olivine basalt, dolerite, gabbro and microgabbro, and all have almost similar chemical compositions. According to chemistry-based naming process carried out through TAS method, these rocks are entirely basalt and basic and are all products of Sub-alkaline-Tholeiitic magma. According to Harker diagrams, a magmatic differentiation can be observed in all volcanic rocks; furthermore, basaltic magma erupted in this area has undergone an alteration and possibly a crustal contamination. The spider diagrams plotted in this paper show that basic rocks of Alasht area (basalts, andesite basalts, dolerites, gabbros and microgabbros) are all mostly similar to ocean island basalts (OIB). Once field study, sampling and microscopic study stages were complete, ten samples were selected for chemical analysis and were analyzed by XRF method.
Highlights
The study area is located around the city of Savad kuh in Mazandaran province roughly 200 kilometers away from Tehran
Arian et al 1200 meters above sea level. This area is often foggy in summers and its foggy mountainous terrain is a popular tourist attraction. Rock units of this area belong to the Mesozoic era and include units of Triassic, Jurassic and early Cretaceous periods plus an outcrop belonging to Quaternary era (Figure 1)
2 l is made of creamy white and light gray thickly layered to massive chert bearing limestone and dolomitic limestone. These units have relatively large outcrops in the northern half and in the east and west of volcanic rocks situated at the study area, and have fault-type borders with the mentioned volcanic rocks
Summary
The study area is located around the city of Savad kuh in Mazandaran province roughly 200 kilometers away from Tehran. This area is positioned between 52 ̊46' and 52 ̊52' eastern longitudes and 36 ̊01' and 36 ̊03' northern latitudes. Arian et al 1200 meters above sea level This area is often foggy in summers and its foggy mountainous terrain is a popular tourist attraction. Rock units of this area belong to the Mesozoic era and include units of Triassic, Jurassic and early Cretaceous periods plus an outcrop belonging to Quaternary era (Figure 1)
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