Latest Wuchiapingian to Earliest Triassic Conodont Zones and delta C-13(carb) Isotope Excursions from Deep-Water Sections in Western Hubei Province, South China
Latest Wuchiapingian to Earliest Triassic Conodont Zones and delta C-13(carb) Isotope Excursions from Deep-Water Sections in Western Hubei Province, South China
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华南鄂西深水剖面最新五家坪期至最早三叠纪牙形刺带及三角洲C-13(碳水化合物)同位素偏移
DOI：
10.1007/s12583-019-1018-2
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发表时间：
2019
影响因子：
3.3
通讯作者：
Lai Xulong
中科院分区：
文献类型：
--
作者：
Yang Bo;Li Hanxiao;Wignall Paul B.;Jiang Haishui;Niu Zhijun;Ye Qian;Wu Qiong;Lai Xulong
深水相剖面具有跨越二叠系-三叠系界线（PTB）记录完整信息的优势。本文对鄂西中扬子区朱桥和十里沟两个深水相剖面从吴家坪阶-长兴阶界线至PTB的牙形石生物地层和碳同位素剖面进行了详细的研究。共鉴定出3属15种。共划分出8个牙形刺带，从大到小依次为Clarkina orientalis、C. wangi，C. subcarinata，C. changxingensis、长柄拟步行虫C. yini，C. meishanensis、小Hindeodus parvus和Isarcicella isarcicazones。鄂西大隆组深水硅质地层的沉积起始于吴家坪晚期，一直持续到长兴晚期。两个剖面的WCB和PTB附近都出现碳同位素负偏移。WCB δ 13 C碳负漂移在C. OrientalisandC. wangizones。PTB δ 13 Ccarb的负向漂移开始于C. yini Zone并扩展到I. isarcica区。几个长兴期带的缺失可能表明在硅质地层中提取牙形刺的困难或存在一个长兴期内的裂孔。
Deep-water facies sections have advantages of recording complete information across the Permian-Triassic boundary (PTB). Here we present a detailed study on the conodont biostratigraphy and carbon isotope profile ranges from the Wuchiapingian-Changhsingian boundary (WCB) to the PTB of two deep-water facies sections at Zhuqiao and Shiligou in the Middle Yangtze region, western Hubei, South China. Fifteen species and three genera are identified. Eight conodont zones are recognized, in ascending order, they are theClarkina orientalis,C. wangi,C. subcarinata,C. changxingensis,C. yini,C. meishanensis,Hindeodus parvus and Isarcicella isarcicazones. The onset of deposition of the deep-water siliceous strata of the Dalong Formation in western Hubei began in the Late Wuchiapingian and persisted to the Late Changhsingian. Carbon isotope negative excursions occur near both the WCB and PTB in both sections. The WCB δ13Ccarbnegative excursion is in theC. orientalisandC. wangizones. The PTB δ13Ccarb negative excursion began in theC. yiniZone and extended to theI. isarcicaZone. The absence of several Changhsingian zones may indicate the difficulty of extracting conodonts from siliceous strata or the presence of an intra-Changhsingian hiatus.