Recognition of upper Triassic temperate foraminiferal assemblages: Insights from the Khodz Group (NW Caucasus, Russia)
A more than 300 m thick succession of thick-bedded pink to grey limestone of the Norian – Rhaetian Khodz Group in the NW Caucasus serves to document the development of a temperate carbonate ramp during the final stages of the Cimmerian orogeny. Limestone samples were collected on the west side of Mt...
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ftunivgeneve:oai:unige.ch:unige:135298 2023-05-15T17:51:48+02:00 Recognition of upper Triassic temperate foraminiferal assemblages: Insights from the Khodz Group (NW Caucasus, Russia) Gale, Luka Rigaud, Sylvain Gennari, Valerio Blau, Joachim Rettori, Roberto Martini, Rossana Gaetani, Maurizio 2020 https://archive-ouverte.unige.ch/unige:135298 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gloplacha.2020.103152 unige:135298 https://archive-ouverte.unige.ch/unige:135298 info:eu-repo/semantics/restrictedAccess ISSN: 0921-8181 Global and Planetary Change, Vol. 188 (2020) P. 103152 info:eu-repo/classification/ddc/550 Upper Triassic Stratigraphy Foraminifers Caucasus Russia Laurasia Text info:eu-repo/semantics/article Article scientifique info:eu-repo/semantics/publishedVersion 2020 ftunivgeneve https://doi.org/10.1016/j.gloplacha.2020.103152 2022-02-08T22:30:19Z A more than 300 m thick succession of thick-bedded pink to grey limestone of the Norian – Rhaetian Khodz Group in the NW Caucasus serves to document the development of a temperate carbonate ramp during the final stages of the Cimmerian orogeny. Limestone samples were collected on the west side of Mt. Kolokolnia. The lower part of the Khodz Group contains bioclastic packstone microfacies composed largely of heterotrophic organisms: bryozoans, brachiopods, echinoderms, bivalves, small benthic foraminifers, juvenile ammonoids, agglutinated worm tubes, gastropods, ostracods and sponges. The upper part is comprised of layers of wackestone with frequent evidences of short episodes of emersion. Sponge spicules locally predominate; very few coral fragments also occur. Foraminiferal assemblages of the Khodz Group contain a high proportion of involutinids, including Licispirella violae (Blau), L. iranica (Senowbari-Daryan, Rashidi & Torabi), Coronaserra deminuta (Blau), Coronipora sp., ?Kristantollmanna bicarinata (Blau), Frentzenella perforata Rigaud, Blau, Martini & Rettori, ?Involutina turgida Kristan, ?Trocholina turris Frentzen, and T. ex gr. intermedia/umbo Frentzen, together with porcelaneous foraminifers such as Galeanella tollmanni (Kristan), and Decapoalina schaeferae (Zaninetti, Altiner, Dager & Ducret), which are typical reef dwellers in tropical platforms. Such faunal and foraminiferal association points to a shallow (photic zone) marine depositional environment. Trocholinids are among the most successful survivors of the end-Triassic crisis. The rich occurrence of diversified trocholinids in temperate Triassic seas at high latitudes within the western Eastern Laurasia palaeobiogeographic province suggests that: 1) temperate areas may have played an important role as refugia for marine life during this major biotic event, and 2) the importance of ocean acidification in the selective extinction of marine organisms is overestimated. Article in Journal/Newspaper Ocean acidification Université de Genève: Archive ouverte UNIGE Global and Planetary Change 188 103152 |
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Université de Genève: Archive ouverte UNIGE |
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ftunivgeneve |
language |
English |
topic |
info:eu-repo/classification/ddc/550 Upper Triassic Stratigraphy Foraminifers Caucasus Russia Laurasia |
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info:eu-repo/classification/ddc/550 Upper Triassic Stratigraphy Foraminifers Caucasus Russia Laurasia Gale, Luka Rigaud, Sylvain Gennari, Valerio Blau, Joachim Rettori, Roberto Martini, Rossana Gaetani, Maurizio Recognition of upper Triassic temperate foraminiferal assemblages: Insights from the Khodz Group (NW Caucasus, Russia) |
topic_facet |
info:eu-repo/classification/ddc/550 Upper Triassic Stratigraphy Foraminifers Caucasus Russia Laurasia |
description |
A more than 300 m thick succession of thick-bedded pink to grey limestone of the Norian – Rhaetian Khodz Group in the NW Caucasus serves to document the development of a temperate carbonate ramp during the final stages of the Cimmerian orogeny. Limestone samples were collected on the west side of Mt. Kolokolnia. The lower part of the Khodz Group contains bioclastic packstone microfacies composed largely of heterotrophic organisms: bryozoans, brachiopods, echinoderms, bivalves, small benthic foraminifers, juvenile ammonoids, agglutinated worm tubes, gastropods, ostracods and sponges. The upper part is comprised of layers of wackestone with frequent evidences of short episodes of emersion. Sponge spicules locally predominate; very few coral fragments also occur. Foraminiferal assemblages of the Khodz Group contain a high proportion of involutinids, including Licispirella violae (Blau), L. iranica (Senowbari-Daryan, Rashidi & Torabi), Coronaserra deminuta (Blau), Coronipora sp., ?Kristantollmanna bicarinata (Blau), Frentzenella perforata Rigaud, Blau, Martini & Rettori, ?Involutina turgida Kristan, ?Trocholina turris Frentzen, and T. ex gr. intermedia/umbo Frentzen, together with porcelaneous foraminifers such as Galeanella tollmanni (Kristan), and Decapoalina schaeferae (Zaninetti, Altiner, Dager & Ducret), which are typical reef dwellers in tropical platforms. Such faunal and foraminiferal association points to a shallow (photic zone) marine depositional environment. Trocholinids are among the most successful survivors of the end-Triassic crisis. The rich occurrence of diversified trocholinids in temperate Triassic seas at high latitudes within the western Eastern Laurasia palaeobiogeographic province suggests that: 1) temperate areas may have played an important role as refugia for marine life during this major biotic event, and 2) the importance of ocean acidification in the selective extinction of marine organisms is overestimated. |
format |
Article in Journal/Newspaper |
author |
Gale, Luka Rigaud, Sylvain Gennari, Valerio Blau, Joachim Rettori, Roberto Martini, Rossana Gaetani, Maurizio |
author_facet |
Gale, Luka Rigaud, Sylvain Gennari, Valerio Blau, Joachim Rettori, Roberto Martini, Rossana Gaetani, Maurizio |
author_sort |
Gale, Luka |
title |
Recognition of upper Triassic temperate foraminiferal assemblages: Insights from the Khodz Group (NW Caucasus, Russia) |
title_short |
Recognition of upper Triassic temperate foraminiferal assemblages: Insights from the Khodz Group (NW Caucasus, Russia) |
title_full |
Recognition of upper Triassic temperate foraminiferal assemblages: Insights from the Khodz Group (NW Caucasus, Russia) |
title_fullStr |
Recognition of upper Triassic temperate foraminiferal assemblages: Insights from the Khodz Group (NW Caucasus, Russia) |
title_full_unstemmed |
Recognition of upper Triassic temperate foraminiferal assemblages: Insights from the Khodz Group (NW Caucasus, Russia) |
title_sort |
recognition of upper triassic temperate foraminiferal assemblages: insights from the khodz group (nw caucasus, russia) |
publishDate |
2020 |
url |
https://archive-ouverte.unige.ch/unige:135298 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
ISSN: 0921-8181 Global and Planetary Change, Vol. 188 (2020) P. 103152 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gloplacha.2020.103152 unige:135298 https://archive-ouverte.unige.ch/unige:135298 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.gloplacha.2020.103152 |
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Global and Planetary Change |
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188 |
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103152 |
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1766159063063724032 |