Latest Wuchiapingian to Earliest Triassic Conodont Zones and δ13 Ccarb Isotope Excursions from Deep-Water Sections in Western Hubei Province, South China  

作　　者：Bo Yang Hanxiao Li Paul B. Wignall Haishui Jiang Zhijun Niu Qian Ye Qiong Wu Xulong Lai 

机构地区：[1]School of Earth Sciences, China University of Geosciences, Wuhan 430074, China [2]Wuhan Center of Geological Survey, Wuhan 430205, China [3]School of Earth & Environment, University of Leeds, Leeds LS2 9JT, UK [4]State Laboratory of Geobiology and Environmental Geology, China University of Geosciences, Wuhan 430074, China [5]Non-ferrous Metals Geological Exploration Bureau of Zhejiang Province, Shaoxing 312000, China [6]State Laboratory of Paleontology and Stratigraphy, Nanjing Institute of Geology and Paleontology, Nanjing 210008, China

出　　处：《Journal of Earth Science》2019年第5期1059-1074,共16页地球科学学刊（英文版）

基　　金：supported by the Natural Science Foundation of China(Nos.41572002,41830320,41272044,41472087,4183000426,41802016)

摘　　要：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 which in ascending order are the Clarkina orientalis, C. wangi, C. subcarinata, C. changxingensis, C. yini, C. meishanensis, Hindeodus parvus and Isarcicella isarcica zones. The onset of deposition of the deep-water siliceous strata of 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 δ13 Ccarb negative excursion is in the C. orientalis and C. wangi zones. The PTB δ13 Ccarb negative excursion began in the C. yini Zone and extended to the I. isarcica Zone. The absence of several Changhsingian zones may indicate the difficulty of extracting conodonts from siliceous strata or the presence of an intra-Changhsingian hiatus.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 which in ascending order are the Clarkina orientalis, C. wangi, C. subcarinata, C. changxingensis, C. yini, C. meishanensis, Hindeodus parvus and Isarcicella isarcica zones. The onset of deposition of the deep-water siliceous strata of 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 δ13 Ccarb negative excursion is in the C. orientalis and C. wangi zones. The PTB δ13 Ccarb negative excursion began in the C. yini Zone and extended to the I. isarcica Zone. The absence of several Changhsingian zones may indicate the difficulty of extracting conodonts from siliceous strata or the presence of an intra-Changhsingian hiatus.

关 键 词：Dalong Formation CONODONTS δ13Ccarb ISOTOPE Wuchiapingian-Changhsingian BOUNDARY PERMIAN-TRIASSIC BOUNDARY 

分 类 号：Q911[天文地球—古生物学与地层学]