Conodont Biostratigraphy and Age of the Early Triassic Fish-Bearing-Nodule Levels from Nanjing and Jurong, Jiangsu Province, South China
Conodont Biostratigraphy and Age of the Early Triassic Fish-Bearing-Nodule Levels from Nanjing and Jurong, Jiangsu Province, South China
复制标题
江苏省南京市和句容市早三叠世鱼结核层牙形刺生物地层和年龄
DOI：
10.1007/s12583-019-1232-y
复制
发表时间：
--
影响因子：
3.3
通讯作者：
Jiang Dayong
中科院分区：
文献类型：
--
作者：
Liu Shuang;Sun Zuoyu;Ji Cheng;Zhou Min;Jiang Dayong
许多地区的早三叠世海相地层中都发现了含鱼结核，包括东格陵兰岛、东斯匹次卑尔根岛、马达加斯加西北部、加拿大、安哥拉和中国南方。以南京市龙潭（LT）剖面和江苏省句容县青山（QS）剖面为基础，对含有鱼类结核水平的地层进行了一项新的奥伦尼克期（早三叠世）牙形刺生物地层学研究。两个断面共采集样品101个，识别出3个牙形刺区：由高到低依次为Scythogondolella(Sc.)milleri区、Novispathodus(Nv.)pingdingshanensis区和Triassospathodus(Tr.)aff.homeri区。 Scythogondolella milleri带是全球公认的史密斯线最上面的牙形石带，而平顶山Novispathodus 平顶山带的底部曾被认为是扬子地区史密斯线-斯帕线边界的标志。南京和句容的鱼类结核水平位于牙形石Scythogondolella milleri带内，与安徽巢湖的Novispathodus waageni带上部也存在鱼类结核水平，横向相关性较好。牙形刺生物地层对比证实了下扬子地区早三叠世的含鱼结核水平是同时代的，年龄为史密斯纪末期。
Fish-bearing nodules are found in Early Triassic marine strata in many regions, including East Greenland, East Spitsbergen, Northwest Madagascar, Canada, Angola, and South China. A new Olenekian (Early Triassic) conodont biostratigraphic study for stratum that contains fish-bearing nodule levels is conducted based on the Longtan (LT) Section of Nanjing City and the Qingshan (QS) Section of Jurong County, Jiangsu Province, South China. A total of 101 samples were collected at the two sections and three conodont zones were recognized: in ascending order, they areScythogondolella(Sc.)milleriZone,Novispathodus(Nv.)pingdingshanensisZone, andTriassospathodus(Tr.) aff.homeriZone. TheScythogondolella milleriZone is globally recognized as the uppermost conodont zone of the Smithian and the base of theNovispathodus pingdingshanensisZone was previously suggested as the marker of the Smithian-Spathian boundary in the Yangtze region. The fish-bearing-nodule levels of Nanjing and Jurong are within the conodontScythogondolella milleriZone, laterally correlated well with the upper part of theNovispathodus waageniZone in Chaohu of Anhui Province that also contains fish-bearing-nodule levels. The conodont biostratigraphic correlation confirms the Early Triassic fish-bearing-nodule levels in the Lower Yangtze region are coeval, with an end-Smithian in age.