فهرس المقالات Oligocene

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  1 - Microbiostratigraphy of the Qom Formation in south and west of Tafresh, Central Iran
  I. Maghfouri Moghadam S. Borji E. Amini S. Azadbakht M. Taherpour Khalil Abad
  The Qom Formation, a series of shales, sandstones and carbonate deposits, is the last transgression of the sea in Central Iran sedimentary basin. Foraminifera are one of the most important and numerous fossil groups present in the Qom Formation. In this study, the micro أکثر

  The Qom Formation, a series of shales, sandstones and carbonate deposits, is the last transgression of the sea in Central Iran sedimentary basin. Foraminifera are one of the most important and numerous fossil groups present in the Qom Formation. In this study, the micropaleontology of the Qom Formation in three measured stratigraphic sections in south and west of Tafresh (Rakin, Band-e-Ali Naghi Beig and Hezar Abad) are discussed. Except of the Rakin stratigraphic section, the lower and upper boundaries of the Qom Formation with Lower and Upper Red formations are conformable from the stratigraphy point of view. But, there is no outcrop in the upper boundary of the Rakin stratigraphic section. The study of 78 samples which were taken from the studied sections led to the identification of 34 genera and 39 species of benthonic foraminifera, 2 genera and 2 species of planktonic foraminifera, 4 genera of red algae and 3 genera of bryozoan. Based on the recognized foraminifera such as Lepidocyclina (Nephrolepidina), Miogypsioides sp., Meandropsina anahensis, Ammonia beccarii the age of the Qom Formation in the Rakin stratigraphic section is determined as Chatian-Aquitanian and in the Band-e-Ali Naghi Beig stratigraphic section as well as the Hezar Abad stratigraphic section is determined as Aquitanian. تفاصيل المقالة
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  2 - Oligocene-Miocene Microfacies Study of Asmari Formation(NW - SE of Shiraz, Iran)
  Mohammad Sadegh Dehghanian Borzu Asgari Pirbalouti Hamidreza Masoumi
  In this research, totally 610.4 meters of the Asmari Formation are studied in two stratigraphic sections on Bavan Mountain an Sarvestan section in Fars province, Iran. The indexed microfacies are carefully determined through studying of 230 thin sections.This research s أکثر

  In this research, totally 610.4 meters of the Asmari Formation are studied in two stratigraphic sections on Bavan Mountain an Sarvestan section in Fars province, Iran. The indexed microfacies are carefully determined through studying of 230 thin sections.This research shows that the indexed microfacies are mudstone, wackestone, packstone, prainstone and the amount of microfacies elements such as bioclasts, pellets, extraclasts and intraclasts. They are varied in different parts of the studied sections and the total amount of bioclasts in the section is more than other elements. The abundance of benthic bioclasts represents the regression of the basin from the open sea into the sub tidal and intertidal zone. تفاصيل المقالة