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Spatial and temporal evolution of Ediacaran carbon and sulfur cycles in the Lower Yangtze Block, South China
Wang, W.; Guan, C.; Hu, Y.; Cui, H.; Muscente, A.D.; Chen, L.; Zhou, C. (2020). Spatial and temporal evolution of Ediacaran carbon and sulfur cycles in the Lower Yangtze Block, South China. Palaeogeogr. Palaeoclimatol. Palaeoecol. 537: 109417. https://dx.doi.org/10.1016/j.palaeo.2019.109417
In: Palaeogeography, Palaeoclimatology, Palaeoecology. Elsevier: Amsterdam; Tokyo; Oxford; New York. ISSN 0031-0182; e-ISSN 1872-616X
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoord
    Marien/Kust
Author keywords
    Ediacaran ocean; Carbon isotopes; Sulfur isotopes; Redox stratification;Spatial variation; Lantian Biota
Auteurs  Top 
  • Wang, W.
  • Guan, C.
  • Hu, Y.
  • Cui, H.
  • Muscente, A.D.
  • Chen, L.
  • Zhou, C.
Abstract
    Major radiations of microscopic and macroscopic eukaryotes occurred respectively in the early and middle Ediacaran Period. Various hypotheses have been proposed to attribute these evolutionary events to changes in ocean redox conditions. To date, published models of the Ediacaran ocean in South China have largely been focused on the Upper and Middle Yangtze blocks, as opposed to the slope and basin sections of the Lower Yangtze Block, where the oldest complex macrofossils of the Ediacaran (i.e. the ~600?Ma Lantian Biota) are preserved. To achieve a holistic understanding of the record of ocean chemistry in the entire Yangtze Block, we carried out carbon (d13Ccarb and d13Corg) and sulfur (d34SCAS and d34Spyr) isotopic investigations of four new sections (i.e., Wujialing, Meishuxia, Wangfu and Zhushuwu) in the Lower Yangtze Block, in addition to one previously reported drill core at Lantian. The Doushantuo and Lantian formations at these sections represent shelf margin, upper slope, lower slope, and deep basin environments. In conjunction with previous work on sections of the Upper and Middle Yangtze blocks, our study reconstructs the redox structure of the entire Ediacaran ocean in South China. The new results show profound d13Ccarb negative excursions in the slope and deep basinal sections, which can be correlated to the EN3 and Shuram excursions at a global scale. Notably, the d13Ccarb and d34Spyr profiles from shelf to basinal sections show distinct spatial and temporal patterns, which can be explained by model of a redox stratified ocean during the early and middle Ediacaran Period. The finding of isotopically light (34S-depleted) pyrite from this time suggests that the oceanic chemocline extended to intermediate depth. Integrating this study with existing ecological and taphonomic data, it is likely that marine redox stratification in the early Ediacaran limited the spatial distribution of early metazoans in the Lower Yangtze Block.
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STARDUST II is a project funded by the INTERREG III A programme (France/Walloon Region/Flanders French-Flemish subprogramme) of the European Community's Regional Development Fund.
Hosted by the Flanders Marine Institute (VLIZ)