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Astronomical calibration of the Middle Ordovician of the Yangtze Block, South China
Zhong, Yangyang1,2; Wu, Huaichun1,2; Zhang, Yuandong (张元动)3; Zhang, Shihong1; Yang, Tianshui1; Li, Haiyan1; Cao, Liwan1

Establishing a high-precision numerical geological time scale for the Paleozoic Era remains a considerable challenge. In this study, we conducted detailed cyclostratigraphic analysis on the Middle Ordovician of the Huangnitang section and the core Changjin 3 (CJ-3), Zhejiang Province, South China. Magnetic susceptibility (MS) series were obtained from a total of 3909 discrete samples and are used as a paleoclimate proxy indicative of variations in detrital input of magnetic minerals. Power spectral analyses show that both the section and core have recorded an excellent hierarchy of Milankovitch cycles of 405 kyr, 101-135 kyr, 31-34 kyr, and 15.8-21.3 kyr. An integrated floating astronomical time scale (ATS) for the section and core was established according to the extracted stable 405-kyr eccentricity cycles. This new floating ATS suggests that the durations of the Darriwilian and Dapingian stages were 8.38 +/- 0.4 Myr and 1.97 +/- 0.7 Myr, and the durations of complete graptolite zones of the Middle Ordovician were precisely estimated. The ratios of band (obliquity or short eccentricity) power to total power reveal periodicities of similar to 1.2 Myr for the s(4)-s(3) term and similar to 1.9 Myr for the g(4)-g(3) term, and similar to 1.2-Myr obliquity cycles may have controlled global third-order eustatic sequences during the late Darriwilian.

KeywordCyclostratigraphy Floating Astronomical Time Scale Darriwilian Dapingian Long-period Astronomical Cycle Third-order Eustatic Sequence
Indexed BySCI
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000438477700008
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
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.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, CAS Key Lab Econ Stratig & Palaeogeog, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Zhong, Yangyang,Wu, Huaichun,Zhang, Yuandong ,et al. Astronomical calibration of the Middle Ordovician of the Yangtze Block, South China[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2018,505:86-99.
APA Zhong, Yangyang.,Wu, Huaichun.,Zhang, Yuandong .,Zhang, Shihong.,Yang, Tianshui.,...&Cao, Liwan.(2018).Astronomical calibration of the Middle Ordovician of the Yangtze Block, South China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,505,86-99.
MLA Zhong, Yangyang,et al."Astronomical calibration of the Middle Ordovician of the Yangtze Block, South China".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 505(2018):86-99.
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