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Strontium Isotope Stratigraphy at Middle Eocene from the Zagros Mountains of IranNormal access

Authors: B. Almasinia, S. Ali Moallemi, F. Fürsich and M. Ahmad Hosseini
Event name: Sixth Arabian Plate Geology Workshop
Session: Poster Session
Publication date: 05 December 2016
DOI: 10.3997/2214-4609.201602391
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 2.15Mb )
Price: € 20

Summary:
For doing sequence stratigraphy on Eocene rocks of the High-Zagros in Iran, finding accurate age of samples was necessary, so we chose two sections (Hamzeh-Ali and Shalamzar) and studied on benthic and pelagic foraminifers, but age of some index benthic foraminifera was too long and extension of pelagic foraminifera narrow thus we used of strontium dating for earning the precise age of the sections for understanding this momentous. Some samples were selected for strontium dating analyses because of lithology and texture. The strontium isotope seawater curve for the Early to Middle Eocene has been earned by samples from sections. The lowest 87Sr/86Sr values belonged to Early Eocene at ~52 Ma and generally increased throughout the Middle Eocene at ~45 Ma. These results are exactly confirmed by benthic and pelagic foraminifera. A credible explanation for the 87Sr/86Sr increased between 52 to 45 Ma is stagnancy for volcanic activities at Middle Eocene. Although, the strontium isotope values increased toward middle Eocene but sea level changed to be shallower environment.


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