Primary mineralogy of Dalichai carbonate formation and separation of upper boundary with Lar formation based on geochemical studies in northeast of Semnan

Shahkaram, Elmira; Adabi, Mohammad Hosein; Jahani, Davood; Vaziri, Seyed Hamid

doi:10.22071/gsj.2019.188226.1661

Document Type : Original Research Paper

Authors

¹ Ph.D. Student, Department of Geology, North Tehran Branch, Islamic Azad University, Tehran, Iran

² Professor, School of Earth Sciences, Shahid Beheshti University, Tehran, Iran

³ Associate Professor, Department of Geology, Basic Science Faculty, North Tehran branch,Islamic Azad University, Tehran, Iran.

⁴ Professor, Department of Geology, North Tehran Branch, Islamic Azad University, Tehran, Iran

https://doi.org/10.22071/gsj.2019.188226.1661

Abstract

The Dalichai Formation is the first rock unit of the Middle Jurassic in the Alborz sedimentary basin that has occurred in a marine environment. The boundary of the Dalichai formation with Shemshak Formation is erosional unconformable while it is concordant with Lar formation. Due to lithological similarity, the boundary of the Dalichai formation with the Lar formation is unclear. It is also very difficult to identify the primary carbonates mineralogy, due to the effects of diagenetic processes solely on the basis of petrographic studies. We studied a section of Sharaf mountain with a thickness of 1420m and 149 samples was studied. The study of the major and minor elements, the Oxygen and Carbon isotopes, and plotting of these values against each other represents that the Dalichai formation have had original aragonite mineralogy, and the nonmarine diagenesis have had the highest impact on them. Plotting the Sr/Ca ratio versus Mn value, shows that these carbonates are affected in a semi-closed to open diagenetic system. Using Sr, Sr/Na, Sr/Ca, Oxygen and Carbon isotopes, the boundary of this formation with the Lar Formation is recognized in thickness of 1200m. The diagenetic environment temperature for this section limestones is 32.9^ºC.

Keywords

Main Subjects

Sedimentology

References

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Scientific Quarterly Journal of Geosciences

Primary mineralogy of Dalichai carbonate formation and separation of upper boundary with Lar formation based on geochemical studies in northeast of Semnan

References

References

Volume 31, Issue 1 - Serial Number 119
Volume 31, Issue 1, Serial Number 121, Spring, 2021
June 2021
Pages 13-24

Primary mineralogy of Dalichai carbonate formation and separation of upper boundary with Lar formation based on geochemical studies in northeast of Semnan

References

References

Volume 31, Issue 1 - Serial Number 119Volume 31, Issue 1, Serial Number 121, Spring, 2021June 2021Pages 13-24

Volume 31, Issue 1 - Serial Number 119
Volume 31, Issue 1, Serial Number 121, Spring, 2021
June 2021
Pages 13-24