Progress in the study of the Devonian–Carboniferous boundary sections in the Berchogur Depression (Mugodzhary Mountains, western Kazakhstan)
Progress in the study of the Devonian–Carboniferous boundary sections in the Berchogur Depression (Mugodzhary Mountains, western Kazakhstan)
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DOI：
10.1007/s12542-022-00611-z
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发表时间：
2022-05
期刊：
影响因子：
1.8
通讯作者：
S. Nikolaeva;E. Kulagina;S. Mustapayeva;A. Alekseev;Y. Gatovsky;J. Denayer;V. Ohar;A. Kurilenko;Valentina Ja. Zhaimina;E. V. Mychko
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文献类型：
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作者：
S. Nikolaeva;E. Kulagina;S. Mustapayeva;A. Alekseev;Y. Gatovsky;J. Denayer;V. Ohar;A. Kurilenko;Valentina Ja. Zhaimina;E. V. Mychko
重新研究了哈萨克斯坦西部Mugozhary(Mugalzhary)山脉Berchogur(Birshogyr)剖面的泥盆纪-石炭系界线层，已知含有各种化石群，包括菊石、牙形刺、有孔虫、珊瑚、海百合和三叶虫。张家那组的硅质碎屑-碳酸盐序列揭示了几个菊石、牙形刺和有孔虫带的存在。这一演替包含Acutimitoceras菊状Gen臭氧，相当于德国斯托克姆菊状动物群的水平，牙形刺管藻硫酸盐出现在Gen臭氧内。对Berchogur剖面的研究始于20世纪80年代；这些剖面是全球为数不多的与牙形刺和有孔虫有关的尖端有孔虫的菊石。当时，对布尔提拜(张安塞)溪上游一小块区域的几个露头和剖面附近的两个钻孔进行了研究，描述了菊科、有孔虫、介形类、牙形刺、藻类和孢子的新分类群。2018-2020年的新发掘，加上寻找泥盆纪-石炭系界线的新定义，提供了关于这些分类群、岩性以及海百合、三叶虫和珊瑚的大量新信息。标志化石的确切位置和岩性变化在Burtybai Creek沿线的几个部分被记录在案，从而与西欧的D-C边界层部分进行了修正。
The Devonian–Carboniferous boundary beds in the Berchogur (Birshogyr) sections in the Mugodzhary (Mugalzhary) Mountains in western Kazakhstan, known to contain various fossil groups, including ammonoids, conodonts, foraminifers, corals, crinoids, and trilobites, are re-examined. The siliciclastic-carbonate succession of the Zhangana Formation reveals the presence of several ammonoid, conodont, and foraminiferal zones. The succession contains theAcutimitocerasammonoid Genozone, equivalent to the level of the Stockum ammonoid fauna of Germany, with the conodontSiphonodella sulcataappearing within the Genozone. The same beds show mass occurrences of the foraminiferTournayellina pseudobeata.The study of the Berchogur sections began in the 1980s; these sections are among very few successions globally with ammonoids of theAcutimitocerasGenozone in association with conodonts and foraminifers. At that time, several outcrops in a small area in the upper reaches of Burtybai (Zhangansai) Creek and two boreholes drilled near the sections were studied, and new taxa of ammonoids, foraminifers, ostracods, conodonts, algae, and spores were described. New excavations in 2018–2020, in conjunction with a search for a new definition of the Devonian–Carboniferous boundary, provided abundant new information on these taxa, on the lithology, and on crinoids, trilobites, and corals. The exact position of marker fossils and lithological changes are documented in several sections along Burtybai Creek allowing an amended correlation with sections of the D–C boundary beds in Western Europe.