فهرست مقالات Conodont

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  1 - Biostratigraphy of Devonian-Carboniferous boundary in Tuyeh-Darvar section, north of Iran
  Mohammad Taghi Najjarzadeh Ali Reaza Ashouri Mehdi Yazdi Ali Bahrami
  10.30495/ijes.2020.673332
  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 چکیده کامل

  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). پرونده مقاله
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  2 - Biostratigraphic Correlation of Elikah Formation in Zal Section (Northwestern Iran) with Ruteh and Type Sections in Alborz Mountains Based on Conodonts
  Nazanin BadriKolalo Bahaeddin Hamidi Seyed Hamid Vaziri Seyed Ali Aghanabati
  Conodonts are the most important fossil remains from the largest Phanerozoic extinction as well as the mass extinction of the late Paleozoic and could be used for exact dating during this period. Triassic deposits located in the Elikah Formation contain exposures in mos چکیده کامل

  Conodonts are the most important fossil remains from the largest Phanerozoic extinction as well as the mass extinction of the late Paleozoic and could be used for exact dating during this period. Triassic deposits located in the Elikah Formation contain exposures in most of the Alborz sections as well as the Zal section in northwestern Iran. In this study, the Elikah Formation was investigated from a biostratigraphy point of view in the type section and Ruteh section of the Alborz Mountains and Zal section in the Jolfa region based on the existing conodonts. Biostratigraphy study of more than 300 samples taken from these three sections, resulted in the identification and introduction of the following conodont biozones: Taxone Range Zone Hindeodus parvus and Pachycladina symmetrica – Pachycladina Oblique Assemblage Zone in the type section, Hindeodus parvus Taxon Range Zone, Hadrodontina –Pachycladina Assemblage Zone and Parachirognathus – Furnishius Assemblage Zone in the Ruteh section and finally Hindeodus parvus Taxon Range Zone, Isracicella staeschei Taxon Range Zone and Arachirognathus – Furnishius Assemblage Zone in the Zal section. These biozones indicate that the Elikah Formation, in the three previously defined sections, is Early Triassic (Griesbachian). Additionally, comparison of the biozones in these sections illustrates a biostratigraphic correlation of Early Triassic deposits in the Zal, Ruteh and type sections. پرونده مقاله