The Silurian-Devonian boundary in East Yunnan (South China) and the minimum constraint for the lungfish-tetrapod split

被引:0
作者
Wenjin Zhao
Xiaolin Zhang
Guodong Jia
Yan’an Shen
Min Zhu
机构
[1] Chinese Academy of Sciences,Key CAS Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology
[2] University of Chinese Academy of Sciences,School of Earth and Space Sciences
[3] CAS Center for Excellence in Life and Paleoenvironment,State Key Laboratory of Marine Geology
[4] University of Science and Technology of China,undefined
[5] Tongji University,undefined
来源
Science China Earth Sciences | 2021年 / 64卷
关键词
Carbon isotope stratigraphy; Silurian-Devonian boundary; East Yunnan; South China; Lungfish-tetrapod split; Calibration date;
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摘要
The Silurian-Devonian interval is an essential period in Earth history for witnessing the rise of sarcopterygian fishes and terrestrial vascular plants. In addition to its implication in global stratigraphic correlation, the precise location of the Silurian-Devonian boundary (SDB) in East Yunnan closely relates to the minimal and maximal estimated dates for the lungfish-tetrapod split. Several geochemical indicators including the values and curves of δ13Corg, δ13Ccarb and TOC are obtained from the continuous SDB sequence in Dahe, Yiliang County, East Yunnan. The results reveal the significant positive δ13Corg shifts in the upper part of the Yulungssu Formation and the lower part of the Xishancun Formation, and the peak value (−20.0‰) in the sample YD-25 from the lowermost of the Xishancun Formation, replicating the δ13Corg variation trend from the uppermost Silurian to the lowermost Devonian worldwide. The δ13Corg variation across the SDB at the Dahe Section resembles the SDB curve from the borehole Klonk-1 drilled at the top of the Klonk GSSP in the Prague Basin, Czech Republic. As such, we place the SDB in the Dahe Area between the samples of YD-17 and YD-18 from the lowermost part of the Xishancun Formation. This SDB assignment is corroborated by new findings of Early Devonian thelodont Parathelodus from the lower part of the Xishancun Formation in Qujing Area. The resolution of the SDB in Dahe, coupled with available paleontological data and the biostratigraphic zonation in East Yunnan, has provided vital data for the geological ages of the fish-bearing strata in East Yunnan. The earliest rhipidistian Youngolepis from the Xishancun Formation (Lochkovian, Devonian) and earliest stem-sarcopterygian Psarolepis from the Kuanti Formation (Ludfordian, Silurian) in East Yunnan indicate that the split between lungfish and tetrapods occurred between 426.5 and 416.0 Ma.
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页码:1784 / 1797
页数:13
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共 353 条
  • [1] Benton M J(2015)Constraints on the timescale of animal evolutionary history Palaeontol Electrona 18 1-116
  • [2] Donoghue P C J(2007)Paleontological evidence to date the Tree of Life Mol Biol Evol 24 26-53
  • [3] Vinther J(2006)Carbon isotope stratigraphy of the Devonian of Central and Southern Europe Palaeogeogr Palaeoclimatol Palaeoecol 240 68-88
  • [4] Asher R J(2004)Carbon isotope stratigraphy of Lochkovian to Eifelian limestones from the Devonian of central and southern Europe Int J Earth Sci-Geol Rundsch 93 521-541
  • [5] Friedman M(1994)New advance in the study of biostratigraphy of Lower and Middle Devonian marine-continental transitional strata in East Yunnan (in Chinese with English abstract) Sci China Ser B 24 634-639
  • [6] Near T J(2020)Subdivision and age of the Silurian fish-bearing Kuanti Formation in Qujing, Yunnan Province (in Chinese with English abstract) Vert PalAsiat 58 249-266
  • [7] Benton M J(2007)Revisions of conodont biostratigraphy across the Silurian-Devonian boundary Bull Geosci 82 145-164
  • [8] Donoghue P C J(1981)A new crossopterygian, Sci Sin 24 89-97
  • [9] Buggisch W(1984), gen. et sp. nov., from Lower Devonian of E. Yunnan, China Proc Linn Soc N S W 107 171-184
  • [10] Joachimski M M(1993)Structure and phylogenetic significance of AAP Memoirs 15 183-198