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Journal of Earth Science

, Volume 28, Issue 2, pp 187–195 | Cite as

Carbon isotope gradient of the Ediacaran cap carbonate in the Shennongjia area and its implications for ocean stratification and palaeogeography

  • Guangzhe Wang
  • Jiasheng Wang
  • Zhou Wang
  • Can Chen
  • Junxia Yang
Paleontology and Paleoecology

Abstract

The geochemistry and paleogeography of the Doushantuo succession in the Shennongjia area have been insufficiently studied. Here, we report on the carbon and oxygen isotope compositions of Ediacaran Doushantuo cap carbonates from four sections (Longxi, Muyu, Yazikou and Songluo) in the Shennongjia area. A large C-isotopic gradient (~5‰) between the Longxi and Songluo sections, here identified for the first time, is inferred to have been dynamically maintained by photosynthesis in surface waters and anaerobic oxidation of dissolved organic carbon (DOC) in deep waters. Spatial variation in C-isotope chemostratigraphy among the four sections was related to Marinoan post-glacial sea-level elevation changes. At Longxi, a positive δ 13Ccarb shift below the horizon containing tepee-like structure resulted from intense photosynthesis during early regression. A negative δ 13Ccarb shift within the tepee-horizon was triggered by sulfate reduction and freshwater mixing with 13C-depleted dissolved inorganic carbon (DIC) during late regression. A positive δ 13Ccarb excursion in the uppermost part of the cap carbonate was related to enhance primary productivity and organic matter burial during early transgression. At Muyu, the carbon isotopic variation tendency, which is similar to that at Longxi, may have been mildly influenced by the surface water environment. At Songluo, the positive δ 13Ccarb excursion, up to -4‰ in the lower part of the cap carbonate, was probably associated with methanogenesis in deep waters during late transgression to early regression and subsequently disappeared due to decomposition of methane hydrate during late regression. At Yazikou, the consistently stable δ 13Ccarb values around -4‰ indicate that the cap carbonate may have deposited at intermediate water depths. As evidenced by diagnostic sedimentary characteristics of the study sections, the palaeogeographic framework of the Shennongjia area exhibited deepening from SE to NW during the Early Ediacaran Period in the aftermath of Snowball Earth.

Key Words

Ediacaran Doushantuo cap carbonate carbon isotope stratification palaeogeography Shennongjia 

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Notes

Acknowledgments

This research is supported by State Key R&D project of China (No. 2016YFA0601100) & the international IMBER project, the National Natural Science Foundation of China (Nos. 41472085, 41172102) and China Scholarship Council. We would like to thank Xinjun Wang for carbon and oxygen isotope analysis. We are also grateful to three anonymous reviewers and the editor for their constructive comments and the Prof. Thomas J. Algeo for his valuable reviews. The final publication is available at Springer via http://dx.doi.org/10.1007/s12583-016-0923-x.

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Copyright information

© China University of Geosciences and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Guangzhe Wang
    • 1
    • 2
  • Jiasheng Wang
    • 1
  • Zhou Wang
    • 1
  • Can Chen
    • 1
  • Junxia Yang
    • 1
  1. 1.State Key Laboratory of Biogeology and Environment Geology, School of Earth SciencesChina University of GeosciencesWuhanChina
  2. 2.Institute of Karst Geology, CAGSKey Laboratory of Karst Ecosystem and Treatment of Rocky Desertification, MLRGuilinChina

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