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Recognition of upper Triassic temperate foraminiferal assemblages: Insights from the Khodz Group (NW Caucasus, Russia)
Global and Planetary Change ( IF 3.9 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.gloplacha.2020.103152
Luka Gale , Sylvain Rigaud , Valerio Gennari , Joachim Blau , Roberto Rettori , Rossana Martini , Maurizio Gaetani

Abstract 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.

中文翻译:

识别上三叠统温带有孔虫组合:来自 Khodz Group(俄罗斯西北高加索)的见解

摘要 西高加索地区 Norian-Rhaetian Khodz 群的超过 300 m 厚的粉红色至灰色厚层石灰岩序列有助于记录 Cimmerian 造山运动最后阶段的温带碳酸盐斜坡的发展。石灰石样品是在山西侧采集的。科洛科尼亚。Khodz 群的下部包含主要由异养生物组成的生物碎屑堆积岩微相:苔藓动物、腕足动物、棘皮动物、双壳类动物、小型底栖有孔虫、幼年菊科动物、粘连蠕虫管、腹足动物、介形动物和海绵。上部由多层碎石组成,经常有短时间出现的迹象。海绵针状体在当地占优势;也很少出现珊瑚碎片。Khodz 组的有孔虫组合包含高比例的渐卷线虫,包括 Licispirella violae (Blau)、L. iranica (Senowbari-Daryan、Rashidi & Torabi)、Coronaserra deminuta (Blau)、Coronipora sp.、?Kristatallmanna bicarin Frentzenella perforata Rigaud、Blau、Martini & Rettori、Involutina turgida Kristan、Trocholina turris Frentzen 和 T. ex gr。intermedia/umbo Frentzen,连同瓷质有孔虫,如 Galeanella tollmanni (Kristan) 和 Decapoalina schaeferae (Zaninetti、Altiner、Dager 和 Ducret),它们是热带平台上典型的珊瑚礁居民。这种动物群和有孔虫的关联指向浅层(光区)海洋沉积环境。Trocholinids 是三叠纪末危机中最成功的幸存者之一。
更新日期:2020-05-01
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