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Late Ordovician obliquity-forced glacio-eustasy recorded in the Yangtze Block, South China
Zhong, Yangyang1,2,3; Wu, Huaichun1,2; Fan, Junxuan (樊隽轩)4,5,6; Fang, Qiang1,2; Shi, Meinan1,2; Zhang, Shihong1; Yang, Tianshui1; Li, Haiyan1; Cao, Liwan1
2020-02-15
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
Volume540Pages:16
Abstract

A high-precision time framework is critical for improving our understanding of three major events: the Late Ordovician mass extinction, the Hirnantian glaciation, and the Hirnantian isotopic carbon excursion (HICE). In the present study, we conducted detailed cyclostratigraphic analysis of a high-resolution (1-2-cm intervals) anhysteretic remanent magnetization series obtained from the Wanhe section in South China, covering the lower Katian through Hirnantian. Power spectra and derived average spectral misfit results show that the section records the ensemble of Milankovitch cycles with 405-kyr (long-eccentricity), 93-125-kyr (short-eccentricity), 33.8-kyr (main obliquity), and 17-22-kyr (precession) periods. The obliquity period of 33.8 +/- 0.46 kyr indicates a precession constant k of 57.19 +/- 0.53 arcsec/yr, a length of day of 22.37 +/- 0.12 h, and an Earth-Moon distance of 375,330 +/- 722 km (vs. 384,000 km today) during the Late Ordovician (445 Ma). The ratios of obliquity band power to total power reveal periodicities of 1.32 Myr for the s4-s3 term and 173.4 kyr for the s3-s6 term. Aided by the highly fluctuating magnetic susceptibility (MS), we recognized a series of 1.32-Myr obliquity-forced glacio-eustatic cycles with three intervals of sea-level rise and climate warming trend characterized by high MS values and two episodes of sea-level fall and climate cooling trend before the Hirnantian. The 405-kyr and subsequent 33.8-kyr calibrations produce an similar to 7.36-Myr floating astronomical time scale (FATS) for the studied succession, indicating that the estimated durations for the Hirnantian Stage, the worldwide Hirnantian glaciation, and the first and second phases of the Late Ordovician mass extinction were similar to 1225 kyr, similar to 830 kyr, similar to 440 kyr, and similar to 540 kyr, respectively. This work provides a reliable high-resolution time framework for further investigation of the major geological events occurred in the Late Ordovician, and improves our knowledge of Solar System behaviour and Earth-Moon history during that period.

KeywordCyclostratigraphy Astronomical time scale Earth-Moon evolution Wanhe section Hirnantian Mass extinction
DOI10.1016/j.palaeo.2019.109520
Indexed BySCI
Language英语
WOS KeywordGLOBAL BOUNDARY STRATOTYPE ; MIDDLE ORDOVICIAN ; MASS EXTINCTION ; MILANKOVITCH CYCLES ; CHAOTIC BEHAVIOR ; MARINE SEQUENCE ; CLIMATE-CHANGE ; SECTION ; BASIN ; STAGE
Funding ProjectNational Natural Science Foundation of China[41925010] ; National Natural Science Foundation of China[41790451] ; National Natural Science Foundation of China[41725007] ; National Science and Technology Major Project of China[2017ZX0535002-001] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB26000000] ; Fundamental Research Funds for the Central Universities
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000513290300015
Funding OrganizationNational Natural Science Foundation of China ; National Science and Technology Major Project of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Fundamental Research Funds for the Central Universities
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/31389
Collection中国科学院南京地质古生物研究所
Corresponding AuthorWu, Huaichun
Affiliation1.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China
2.China Univ Geosci, Sch Ocean Sci, Beijing 100083, Peoples R China
3.East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang 330013, Jiangxi, Peoples R China
4.Nanjing Univ, Ctr Res & Educ Biol Evolut & Environm, Nanjing 210023, Peoples R China
5.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
6.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Zhong, Yangyang,Wu, Huaichun,Fan, Junxuan ,et al. Late Ordovician obliquity-forced glacio-eustasy recorded in the Yangtze Block, South China[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2020,540:16.
APA Zhong, Yangyang.,Wu, Huaichun.,Fan, Junxuan .,Fang, Qiang.,Shi, Meinan.,...&Cao, Liwan.(2020).Late Ordovician obliquity-forced glacio-eustasy recorded in the Yangtze Block, South China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,540,16.
MLA Zhong, Yangyang,et al."Late Ordovician obliquity-forced glacio-eustasy recorded in the Yangtze Block, South China".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 540(2020):16.
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