Biostratigraphy of Devonian-Carboniferous boundary in Tuyeh-Darvar section, north of Iran

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  • Mohammad Taghi Najjarzadeh1,
  • Ali Reaza Ashouri*2,
  • Mehdi Yazdi3,
  • Ali Bahrami3,
  1. Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran
  2. Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
  3. Department of Geology, Faculty of Science, University of Isfahan, Isfahan, Iran

Revised: 2019-08-16

Accepted: 2019-12-17

Published in Issue 2020-04-01

How to Cite

Najjarzadeh, M. T., Ashouri, A. R., Yazdi, M., & Bahrami, A. (2020). Biostratigraphy of Devonian-Carboniferous boundary in Tuyeh-Darvar section, north of Iran. Iranian Journal of Earth Sciences, 12(2), 98-123. https://oiccpress.com/ijes/article/view/5663

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Abstract

Devonian-Carboniferous boundary is not clear in the Eastern Alborz Mountains. In the current study Tuyeh-Darvar section with about 170 m, thickness is selected. In this investigation, the primary goal is revision of Devonian/Carboniferous Boundary (known as DCB) and the other goal is the redefinition of the DCB as a famous necessity (based on ICS program in 2008 for defining the boundary and to find a new GSSP). According to Conodont data from acid-leaching 53 carbonate samples(by acid acetic) that obtained from Late Devonian and Early Carboniferous deposits in this section, and based on standard conodont Zonation 6 Zone are recognized;1. Bi.ultimus/or Si.praesulcata Zone, 2. Pr.kockeli /or Si.sulcata Zone, 3. Si.duplicata to Si.sandbergi bio interval, 4. Si.crenulata Zone, 5.Gnathodus-P.inornatus Zone, and 6.Ps.multistriatus Zone. Considering to the Conodont Zones above mentioned, Conodont faunas and other evidences, in the Tuyeh-Darvare section the DCB, is located within cream to grey silt stone beds, which are lies between K6 limestone and K8 dark carbonate beds (about 7.10 m above the base of recent studied section).

Keywords

  • Mubarak,
  • Devonian,
  • Jeirud,
  • Conodont,
  • Carboniferous
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