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DOI	10.1016/j.palaeo.2019.05.003
	Conodont biostratigraphy and astronomical tuning of the Lower–Middle Ordovician Liangjiashan (North China) and Huanghuachang (South China) marine sections
	Ma K.; Li R.; Hinnov L.A.; Gong Y.
发表日期	2019
ISSN	0031-0182
起始页码	272
结束页码	287
卷号	528
英文摘要	In this study, systematic conodont biostratigraphy and cyclostratigraphy are carried out on Ordovician sections from the North China and South China blocks. The Liangjiashan section, situated on the North China Block margin, accumulated shallow marine carbonate during the Early Ordovician. The Huanghuachang section (GSSP for the Dapingian Stage), situated on the South China Block margin, accumulated thinly bedded carbonates and minor clastics in a deep shelf environment. Conodont biostratigraphy and 405-kyr long-eccentricity cycles interpreted from the Liangjiashan and Huanghuachang sections are used to establish an Astronomical Time Scale (ATS) for the Early–Middle Ordovician period. The ATS indicates that the duration of the Floian Stage is 7.08 ± 0.405 Myr. The temporal ranges of Lower–Middle Ordovician conodont biozones are also estimated: the durations of the Serratognathus bilobatus, Serratognathus extensus, Oepikodus communis, Oepikodus evae, and Baltoniodus triangularis zones are 1.0 Myr, 5.1 Myr, 0.2 Myr, 0.8 Myr, and 0.2 Myr, respectively. The evolution of the ratio of obliquity to total power and short-eccentricity power to total power depicts periodicities of 1 Myr for the s4–s3 term, and 1.9 Myr shifting to 1 Myr for the g4–g3 term. The shift in the g4–g3 term may indicate a chaotic transition in the Mars and Earth orbital motions from a (s4–s3)–2(g4–g3) to (s4–s3)–(g4–g3) resonance state during the Early Ordovician. © 2019 Elsevier B.V.
英文关键词	Astronomical time scale; Conodont biozones; Cyclostratigraphy; Earth-Mars chaotic transition; Floian
语种	英语
scopus关键词	astronomy; biostratigraphy; biozonation; conodont; cyclostratigraphy; eccentricity; Ordovician; periodicity; timescale; China; North China Block; South China Block
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150918
作者单位	State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China; Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, VA 22030, United States
推荐引用方式 GB/T 7714	Ma K.,Li R.,Hinnov L.A.,等. Conodont biostratigraphy and astronomical tuning of the Lower–Middle Ordovician Liangjiashan (North China) and Huanghuachang (South China) marine sections[J],2019,528.
APA	Ma K.,Li R.,Hinnov L.A.,&Gong Y..(2019).Conodont biostratigraphy and astronomical tuning of the Lower–Middle Ordovician Liangjiashan (North China) and Huanghuachang (South China) marine sections.Palaeogeography, Palaeoclimatology, Palaeoecology,528.
MLA	Ma K.,et al."Conodont biostratigraphy and astronomical tuning of the Lower–Middle Ordovician Liangjiashan (North China) and Huanghuachang (South China) marine sections".Palaeogeography, Palaeoclimatology, Palaeoecology 528(2019).