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Calibrating the Guadalupian Series (Middle Permian) of South China
Wu, Q. (吴琼); Ramezani, J.; Zhang, H. (张华); Wang, T.T.,; Yuan, DX (袁东勋); Mu, L. (牟林); Zhang, YC (张以春); Li, X.H.; Shen, S.Z. (沈树忠)
Source PublicationPalaeogeography, Palaeoclimatology, Palaeoecology
AbstractThe Guadalupian Epoch represents one of the most critical intervals during the Earth history which is characterized by a series of global geological and biological events. However, it is poorly constrained by radioisotopic ages in comparison with the high-precision dates from the Lopingian and lowest Triassic in South China and the Cisuralian in southern Urals, Russia. In this study, we report combined CA-ID-TIMS and SIMS U-Pb zircon geochronology for three ash beds from the base and lower part of the Kuhfeng Formation in the Chaohu area, southeastern China. Zircons from Ash Beds A, C and D were initially analyzed by SIMS and yielded weighted mean Pb-206/U-238 dates of 269.0 +/- 1.4 Ma (MSWD = 1.03, n = 31), 266.3 +/- 2.2 Ma (MSWD = 2.2, n = 29) and 262.2 +/- 1.7 Ma (MSWD = 1.0, n = 20) in ascending order. However, high-precion U-Pb geochronology of the same ash beds by the CA-ID-TIMS method point to important inaccuracies in the SIMS results due to Pb-loss in zircons. Ash Beds A and C yielded two TIMS weighted mean Pb-206/U-238 dates of 272.95 +/- 0.11 Ma (MSWD = 1.9, n = 7) and 271.038 +/- 0.097 Ma (MSWD = 2.2, n = 8), respectively. The depositional age of 272.95 +/- 0.11 Ma for Ash Bed A is postulated as the traditional Cisuralian-Guadalupian boundary (CGB) age in South China. Our new geochronology suggests that the Guadalupian Series in South China had a total duration of 13.85 +/- 0.52 myr given a Guadalupian-Lopingian boundary (GLB) age of 259.1 +/- 0.5 Ma. The new age calibration of the base of the Guadalupian Series is ca. 0.65 (+/- 0.51) myr older than - and improves upon the previous estimates for the CGB age and the duration of the Guadalupian Epoch based on the 2016 International Chronostratigraphic Chart (ICC) and the 2012 Geologic Time Scale (GTS). (C) 2016 Elsevier B.V. All rights reserved.
KeywordGuadalupian Zircon U-Pb geochronology South China Kuhfeng Formation Jinogondolella nankingensis
Indexed BySCI
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000392766900030
Document Type期刊论文
Corresponding AuthorZhang, H. (张华)
Recommended Citation
GB/T 7714
Wu, Q. ,Ramezani, J.,Zhang, H. ,et al. Calibrating the Guadalupian Series (Middle Permian) of South China[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017,466:361-372.
APA Wu, Q. .,Ramezani, J..,Zhang, H. .,Wang, T.T.,.,Yuan, DX .,...&Shen, S.Z. .(2017).Calibrating the Guadalupian Series (Middle Permian) of South China.Palaeogeography, Palaeoclimatology, Palaeoecology,466,361-372.
MLA Wu, Q. ,et al."Calibrating the Guadalupian Series (Middle Permian) of South China".Palaeogeography, Palaeoclimatology, Palaeoecology 466(2017):361-372.
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