NIGPAS OpenIR  > 中国科学院南京地质古生物研究所
Geochronological constraint on the Cambrian Chengjiang biota, South China
Yang, Chuan1; Li, Xian-Hua1,2; Zhu, Maoyan (朱茂炎)2,3; Condon, Daniel J.4; Chen, Junyuan (陈均远)2,5

The Cambrian Chengjiang biota of South China provides compelling fossil evidence for the rapid appearance of metazoan phyla in Earth history (the 'Cambrian explosion'). However, the timing of the Chengjiang biota is poorly constrained owing to lack of datable rock materials within the Maotianshan Shale that yields the fossils. Here we integrate secondary ion mass spectrometry (SIMS) and chemical ablation isotope dilution thermal ionization mass spectrometry (CA-ID-TIMS) U-Pb analyses of detrital zircons fromthe Maotianshan Shale to provide high-precision geochronological constraint on the Chengjiang biota. The youngest group of SIMS U-Pb detrital zircon dates yields an age peak at 520 Ma. Six zircons from this group are further dated by the CA-ID-TIMS U-Pb technique, but suggesting that they were not formed from a single zircon growth event. Thereby neither the age peak nor the weighted mean age defined by the youngest SIMS U-Pb dates could represent the maximum depositional age of the Maotianshan Shale. Instead, the youngest CA-ID-TIMS U-Pb date, 518.03 +/- 0.69/0.71 Ma (2s, analytical uncertainty/incorporates U-Pb tracer calibration uncertainty), provides the first robust maximum age of the Chengjiang biota. This new geochronological constraint on the Chengjiang biota indicates that the Cambrian explosion reached its major phase around 518.03 +/- 0.69/0.71 Ma, demonstrating a protracted process (> 22 myr) for the Cambrian explosion.

Indexed BySCI
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000437913200008
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China;
2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China;
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China;
4.British Geol Survey, NERC Isotope Geosci Lab, Keyworth NG12 5GG, Notts, England;
5.Nanjing Univ, Beihai Marine Stn, Evo Devo Inst, Nanjing 210023, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Yang, Chuan,Li, Xian-Hua,Zhu, Maoyan ,et al. Geochronological constraint on the Cambrian Chengjiang biota, South China[J]. JOURNAL OF THE GEOLOGICAL SOCIETY,2018,175(4):659-666.
APA Yang, Chuan,Li, Xian-Hua,Zhu, Maoyan ,Condon, Daniel J.,&Chen, Junyuan .(2018).Geochronological constraint on the Cambrian Chengjiang biota, South China.JOURNAL OF THE GEOLOGICAL SOCIETY,175(4),659-666.
MLA Yang, Chuan,et al."Geochronological constraint on the Cambrian Chengjiang biota, South China".JOURNAL OF THE GEOLOGICAL SOCIETY 175.4(2018):659-666.
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