Late Devonian–Mississippian conodont biostratigraphy of the Chelcheli section, NE Shahrud (Eastern Alborz, North Iran)
Late Devonian–Mississippian conodont biostratigraphy of the Chelcheli section, NE Shahrud (Eastern Alborz, North Iran)
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晚泥盆世-密西西比期牙形刺生物地层，沙赫鲁德东北部（伊朗北部阿尔布尔士省东部）Chelcheli 剖面
DOI：
10.1007/s12542-021-00575-6
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发表时间：
2021
期刊：
影响因子：
1.8
通讯作者：
S. I. Kaiser
中科院分区：
文献类型：
--
作者：
A. Bahrami;P. Königshof;C. Hartkopf;S. I. Kaiser
对阿尔博尔茨山Chelcheli剖面泥盆纪/石炭纪牙形刺进行了研究。虽然牙形石在整个剖面中的丰度一般较低，但广泛应用的牙形石标准分带的重要地带性指标类群可用于精确的牙形石分带。共鉴定出15属47种牙形石，划分出15个牙形石带，从Palmatolepis minuta minuta带到Scaliognathus anchoralis-Doliognathus latus带。在泥盆纪/石炭纪边界（DCB），黑色页岩和块状砂岩等特征性岩性代表了Hangenberg黑色页岩和Hangenberg砂岩的等同物。在DCB附近，牙形石记录中有一个小的地层间断，这可能是相（浅水序列，没有牙形石记录和硅质岩）的结果，而不是一个非沉积期，因为沉积学记录似乎是连续的。与伊朗浅水相的其他DCB剖面相似，没有出现两个生物地层学上重要的物种Protognathodus kockeli和Protognathodus kuehni。
Devonian/Carboniferous conodonts from the Chelcheli section in the Alborz Mountains were investigated. Although conodonts are generally less abundant in the entire section, important zonal index taxa of the widely applied conodont standard zonation could be used for a precise conodont zonation. Forty-seven conodont species belonging to fifteen genera were identified and led to the discrimination of fifteen conodont zones, ranging from the Palmatolepis minuta minuta Zone into the Scaliognathus anchoralis-Doliognathus latus Zone. At the Devonian/Carboniferous boundary (DCB), characteristic lithologies such as black shales and massive sandstones represent equivalents of the Hangenberg Black Shale and Hangenberg Sandstone. Close to the DCB, there is a small stratigraphic hiatus in the conodont record which might be a result of facies (shallow-water succession with no conodont record and siliciclastic rocks) rather than a period of non-deposition as the sedimentological record seems continuous. Similar to other DCB sections in shallow-water facies in Iran the two biostratigraphically important species Protognathodus kockeli and Protognathodus kuehni do not occur.