Geology and Stratigraphy of the Qom Formation in the Mahneshan area
Authors
1
PhD student, stratigraphy and paleontology, University of Zanjan, Zanjan, Iran.
2
Geology department,, Faculty of science, University of Zanjan. Zanjan. Iran
3
Geology department, Faculty of science. University of Zanjan
Abstract
In order to stratigraphic study of Miocene strata in the Southwest of Zanjan, one stratigraphic section has been sampled and studied in the Sheykh Jaber area. Miocene strata in this area (Qom Formation) are consist of 300 meters of conglomerate, sandstone, siltstone, thin to thick bedded limestone and argillaceous limestone. Forty samples have been selected and studied from these strata. Qom Formation in this section are overlaid by sand stone and siltstone layers of Upper Red Formation and overlay the red conglomerate of Lower Red Formation by erosional surface (unconformity boundary). Qom formation has no complete base and top layers in this section. This fact can confirm unconformities boundary at the top and base of this formation. Qom Formation in this section can divided in to the two stratigraphic package: 1- lower package is consist of conglomerate, sandstone and thin bedded limestone with intrusive rocks. 2- upper package is consist of medium to thick bedded fossiliferous limestone with sandstone and conglomerate intercalation.
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