[20-4] Brachiopods from Iran and their record of the end-Permian events
Abstract: Brachiopods, which are marine, benthic, low–metabolism and physiologically unbuffered organisms with a calcite shell, are good tools for recording the dramatic biotic response to the end-Permian events: volcanism, global warming and ocean acidification. Upper Permian brachiopods from Iran...
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| Format: | Article in Journal/Newspaper |
| Language: | unknown |
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Underline Science Inc.
2021
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| Online Access: | https://dx.doi.org/10.48448/t6b7-ga77 https://underline.io/lecture/33924-20-4-brachiopods-from-iran-and-their-record-of-the-end-permian-events |
| Summary: | Abstract: Brachiopods, which are marine, benthic, low–metabolism and physiologically unbuffered organisms with a calcite shell, are good tools for recording the dramatic biotic response to the end-Permian events: volcanism, global warming and ocean acidification. Upper Permian brachiopods from Iran (mainly from Julfa and Alborz Mts. sections) have already proved to be good recorders of extreme warming and acidification occurring at the end of the period, based on their stratigraphic distribution, shell microstructure, and geochemistry analyses (e.g. Garbelli et al., 2017). Here, we provide additional data on the brachiopod shell microstructure and distribution along the Abadeh section, Central Iran (Taraz et al., 1981), one of the most well known section, which consists of a continuous marine succession spanning the Late Permian to Early Triassic time interval, from the Abadeh Fm. to the Hambast Fm. and the Elikah Fm. The newly studied brachiopods comprise more than 400 specimens belonging to 13 genera and 29 species, dominated by the order Productida and Athyridida. An analysis of the distribution of fibrous fabric vs. laminar ones show that the former increase in abundance in the upper part of the sections, from the base of the conodont zone Clarkina transcaucasica to become the only occurring taxa at the top of the Paratirolites Limestone. A correlation between the Abadeh (Central Iran) and the Julfa section (NW Iran) (Ghaderi et al., 2014) has been obtained based on brachiopod biozonation. In both sections the topmost part of the Paratirolites Limestone is characterized by the occurrence of Paracrurithyris pygmaea, a disaster taxon, one of the few species of marine organisms that, in the fossil record, has been found before, during and after the extinction interval. The fibrous shell of this species is one of the best recorder of the ocean acidification at the end of the Permian (Jurikova et al., 2020). Authors:* Viaretti M.*, Crippa G. & Angiolini L. |
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