Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Primary Mineralogy, reconstruction of sedimentary environment of the Ruteh Formation in Central Alborz. A Petrography and Geochemical approach

Document Type : Original Research Paper

Authors
Mohammad Hosein Adabi
Bita Arbab
Shahid Beheshti University, Earth Science Faculty, Geology Department, Tehran, Iran
Abstract
Ruteh Formation is overlain with distinct laterite - detrital horizon between Elika and Ruteh Formation and is underlain disconformably by Dorud Formation. The Permian sequence is composed of 160 meters of dark to light fossiliferous limestone. Geochemical studies illustrates that these carbonates were affected mostly by distal pheratic meteoric diagenesis.
Elemental and δ18O and δ13C values of limestone in Ruteh Formation led to recognition of calcitic mineralogy. These data fall within subpolar Permian Limestone (Tasmania, Australia) field due to similar calcitic mineralogy. Paleotemperature study indicates an ambient temperature between 27-34.5°c.
Facies analysis and petrographic studies led to recognition of 9 microfacies deposited in an open marine, bar and lagoon environments. On the basis of facies chemistry, the high Sr contents are due to aragonitic components deposited in lagoon to back barrier environments. The high Mg concentration is related to the high abundance of red algae (Gymnocodiacea).
Keywords
Petrographic and Geochemical studies
Sedimentary Environment Reconstruction
Microfacies
Ruteh Formation
Iran

Subjects

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Scientific Quarterly Journal of Geosciences
Volume 12, 45-46
Autumn & Winter 2003, Vol. 12, No. 45-46
Winter 2002
Pages 64-75