Abstract
The present paper represents a petrological and geochemistrical study of Pushtasar basaltic lava in the Moghan region. This basaltic unit with interbeds of Tuff and Breccia tuff divides Upper Eocene sediments into two parts as an east-west band, the thickness of which thins from 1,300 m in the east to a few meters in the west. Therefore, petrography studies and geochemical studies were conducted on the gained samples along different parts of the rim. According to this study, the basic unit which distributes the Upper Eocene sediments into two parts is a transitional magma series with internal plate basalt geodynamic origin. Based on the previous studies, which are mainly focused on providing geological maps and oil prospecting, it seems that there was a descent in tension condition at the end of Eocene and first part of Oligocene after the compression phase in the Upper Cretacea. Probably, this tension condition made a suitable environment for the subsidence of sediments, making hydrocarbon reserves, as the processes have been done in the continental rift or Aulacogene.
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