Evolution of the upper Paleocene-lower Eocene larger benthic foraminifera in the Eastern Tethys, Hormak area, north of Zahedan

Gorgij, Mohammad Nabi; Shahraki Mirzaei, Somayyeh

doi:10.52547/gnf.6.2.397

Volume 6, Issue 2 (Autumn&Winter 2021) KJES 2021, 6(2): 397-424 | Back to browse issues page

‎ 10.52547/gnf.6.2.397

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Gorgij M N, Shahraki Mirzaei S. Evolution of the upper Paleocene-lower Eocene larger benthic foraminifera in the Eastern Tethys, Hormak area, north of Zahedan. KJES 2021; 6 (2) :397-424
URL: http://gnf.khu.ac.ir/article-1-2706-en.html

Evolution of the upper Paleocene-lower Eocene larger benthic foraminifera in the Eastern Tethys, Hormak area, north of Zahedan

Mohammad Nabi Gorgij ^*

¹, Somayyeh Shahraki Mirzaei²

1- University of Sistan and Baluchestan , mngorgij@science.usb.ac.ir
2- University of Sistan and Baluchestan

Abstract: (1492 Views)

Large benthic foraminiferas in Paleogene of Tethyan basin widley distributed that still remain poorly identified in the eastern Tethys specially in the southeastern of Iran. Based on systematic determination of LBFs 12 genera and 24 species in the Late Paleocene-Early Eocene interval are known that are Ranikothalia, Discocyclina, Miscellanites, Miscellanea, Kathina, Idalina, Assilina, Vania, Glomalveolina, Daviesina and Lockhartia. The base of SBZ3 biozone is defined by the first Occurence of Miscellanea juliettae, Miscellanites minutus, Miscellanites primitivus, Vania anatolica, Glomalveolina primaeva, Glomalveolina telemetensis, Glomalveolina dachelensis, Discocyclina seunesi, Ranikothalia sindensis, Ranikothalia tubleri, Kathina selveri. With respect to its high abundance and limited biostratigraphic range of above mentioned species (except Ranikothalia sindensis and Kathina selveri ) can be taken as an index fossils of SBZ3. The base of SBZ4 biozone is defined by the first appearance of Discocyclina ranikotensis, Daviesins langhami, Miscellanea miscella which among them Ranikothalia sindensis, Miscellanea miscella and Daviesina langhami appear in high abundance and widley distributed. It is mentioned that Miscellanites primitivus, in the studied section,is continued to SBZ5/6.SBZ5/6 biozone is defined by Lockhartia haemei, Ranikothalia nuttalli, Ranikothalia sp., Assilina dandotica, Discocyclina dispansa and Discocyclina sella. Species of Ranikothalia nuttalli, Assilina dandotica and Ranikothalia sindensis has high abundance and wide distributions. it is mentioned that in the some part of the eastern Tethys such as Tibet Daviesina genus has disappeared in the SBZ5/6 whilst in the studied sections has high abundance although Alveolina vredenburgi is not seen and Miscellanea miscella has low distribution regard to SBZ4. In the studied section, Earliest Eocene Large Benthic Foraminifera (SBZ5/6) predominantly consists of Ranikothalia and Miscellanea while the new Foraminifera assemblage that’s appear in the other locations (such as Assilina, Alveolina and Discocyclina) are less important and Nummulites are absent. In continuation of Early Eocene, gradual diversity of species of Discocyclina، Operculina and Assillina has occurred, whilst Ranikothalia is disappeared and Miscellanea in the end of SBZ5/6 is less important. Similarity Larger Benthic Foraminifera assemblage in the other part of eastern Tethys especially India and Pakistan are recorded. Therefore this assemblage in the eastern Tethys are different from western Tethys.

Keywords: Late Paleocene - Earliest Eocene, Biostratigraphy, Shalow Benthic Zone, Sistan Suture Zone, Padagi section

Full-Text [PDF 2358 kb] (620 Downloads)

Type of Study: Case-Study | Subject: Stratigraphy and Paleontology
Received: 2019/07/1 | Accepted: 2021/02/20 | Published: 2021/02/28