Carbon isotopes, sulfur isotopes, and trace elements of the dolomites from the Dengying Formation in Zhenba area, southern Shaanxi: Implications for shallow water redox conditions during the terminal Ediacaran

详细信息    查看全文

• 作者：YaLi Chen ; XueLei Chu ; XingLiang Zhang ; MingGuo Zhai
• 关键词：Yangtze Platform ; southern Shaanxi ; Ediacaran ; trace elements ; carbon isotopes ; sulfur isotopes
• 刊名：Science China Earth Sciences
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：58
• 期：7
• 页码：1107-1122
• 全文大小：1,186 KB
• 参考文献：Addy S K. 1979. Rare earth element patterns in manganese nodules and micronodules from northwest Atlantic. Geochim Cosmochim Acta, 43: 1105-115View Article
  Alibo D S, Nozaki Y. 1999. Rare earth elements in seawater: particle association, shale-normalization, and Ce oxidation. Geochim Cosmochim Acta, 63: 363-72View Article
  Banner J L, Hanson G N, Meyers W J. 1988. Rare earth element and Nd isotopic variations in regionally extensive dolomites from the Burlington-Keokuk Formation (Mississippian): Implications for REE mobility during carbonate diagenesis. J Sediment Res, 58: 415-32View Article
  Berkner L V, Marshall L. 1965. On the origin and rise of oxygen concentration in the Earth’s atmosphere. J Atmos Sci, 22: 225-61View Article
  Bowring S A, Grotzinger J P, Condon D J, et al. 2007. Geochronologic constraints on the chronostratigraphic framework of the Neoproterozoic Huqf Supergroup, Sultanate of Oman. Am J Sci, 307: 1097-145View Article
  Bureau of Geology and Mineral Resources of Shaanxi Province. 1989. Regional geology of Shaanxi province (in Chinese). Beijing: Geological Publishing House. 1-98
  Bureau of Geology and Mineral Resources of Shaanxi Province. 1998. Multiple Classification and Correlation of the Stratigraphy of China: Stratigraphy (Lithostratic) of Shaanxi Province (in Chinese). Wuhan: China University of Geosciences Press. 1-91
  Burdett J W, Arthur M A, Richardson M. 1989. A Neogene seawater sulfur isotope age curve from calcareous pelagic microfossils. Earth Planet Sci Lett, 94: 189-98View Article
  Byrne R, Sholkovitz E R. 1996. Marine chemistry and geochemistry of the lanthanides. In: Gschneidner K A, Eyring L, eds. Handbook on the Physics and Chemistry of Rare Earth. Amsterdam: Elsevier. 497-93
  Cai Y, Hua H, Xiao S, et al. 2010. Biostratinomy of the late Ediacaran pyritized Gaojiashan Lagerst?tte from southern Shaanxi, South China: Importance of event deposits. Palaios, 25: 487-06View Article
  Calvert S E, Pedersen T F. 1993. Geochemistry of recent oxic and anoxic marine sediments: Implications for the geological record. Mar Geol, 113: 67-8View Article
  Chen Z, Zhou C, Xiao S, et al. 2014. New Ediacara fossils preserved in marine limestone and their ecological implications. Sci Rep, 4: 4180
  Chu X L, Zhang Q R, Zhang T G, et al. 2003. Sulfur and carbon isotopic variations in Neoproterozoic sedimentary rocks from southern China. Prog Nat Sci, 13: 875-80View Article
  Cloud P E. 1968. Atmospheric and Hydrospheric Evolution on the Primitive Earth Both secular accretion and biological and geochemical processes have affected earth's volatile envelope. Science, 160: 729-36View Article
  Condon D, Zhu M, Bowring S, et al. 2005. U-Pb ages from the neoproterozoic Doushantuo Formation, China. Science, 308: 95-8View Article
  Derry L A, Brasier M D, Corfield R M, et al. 1994. Sr and C isotopes in Lower Cambrian carbonates from the Siberian craton: A paleoenvironmental record during the ‘Cambrian explosion- Earth Planet Sci Lett, 128: 671-81View Article
  Dulski P. 1994. Interferences of oxide, hydroxide and chloride analyte species in the determination of rare earth elements in geological samples by inductively coupled plasma-mass spectrometry. Fresen J Anal Chem, 350: 194-03View Article
  Fike D, Grotzinger J, Pratt L, et al. 2006. Oxidation of the Ediacaran ocean. Nature, 444: 744-47View Article
  Filipek L H, Owen R M. 1981. Diagenetic controls of phosphorus in outer continental-shelf sediments from the Gulf of Mexico. Chem Geol, 33: 181-04View Article
  Gellatly A M, Lyons T W. 2005. Trace sulfate in mid-Proterozoic carbonates and the sulfur isotope record of biospheric evolution. Geochim Cosmochim Acta, 69: 3813-829View Article
  German C R, Holliday B P, Elderfield H. 1991. Redox cycling of rare earth elements in the suboxic zone of the Black Sea. Geochim Cosmochim Acta, 55: 3553-558View Article
  Gill B C, Lyons T W, Frank T D. 2008. Behavior of carbonate-associated sulfate during meteoric diagenesis and implications for the sulfur isotope paleoproxy. Geochim Cosmochim Acta, 72: 4699-711View Article
  Guo Q, Shields G A, Liu C, et al. 2007. Trace element chemostratigraphy of two Ediacaran–Cambrian successions in South China: Implications for organosedimentary metal enrichment and silicification in the early Cambrian. Paleogeogr Paleoclimatol Paleoecol, 254: 194-16View Article
  Hild E, Brumsack H J. 1998. Major and minor element geochemistry of Lower Aptian sediments from the NW German Basin (core Hohenegglesen KB 40). Cretaceous Res, 19: 615-33View Article
  Hua H, Chen Z, Yuan X, et al. 2005. Skeletogenesis and asexual reproduction in the earliest biomineralizing animal Cloudina. Geology, 33: 277-80View Article
  Huang J, Chu X, Jiang G, et al. 2011. Hydrothermal origin of elevated iron, manganese and redox-sensitive trace elements in the c. 635 Ma Doushantuo cap carbonate. J Geol Soc London, 168: 805-16V
• 作者单位：YaLi Chen (1) (2)
  XueLei Chu (1) (3)
  XingLiang Zhang (3)
  MingGuo Zhai (1) (3)
  
  1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
  2. College of Earth Science, University of Chinese Academy of Sciences, Beijing, 100049, China
  3. State Key Laboratory for the Continental Dynamics, Northwest University, Xi’an, 710069, China
  
• 刊物主题：Earth Sciences, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：1869-1897

文摘

Carbon isotope, sulfur isotope, and trace element (including Rare Earth Elements, REE) analyses were conducted on the carbonates of the Dengying Formation at Lianghekou section in southern Shaanxi to reconstruct the terminal Ediacaran shallow-water environment on the northwestern margin of the Yangtze Platform. At Lianghekou section, samples in the middle 50-m of the Beiwan Member show characteristics of low ΣREE concentrations, no MREE-enriched REE distribution patterns, high Ce/Ce* values close to 1, and enriched redox-sensitive elements, whereas samples in the lower 30-m and upper 10-m show opposite characteristics of high ΣREE concentrations, MREE-enriched REE distribution patterns, low Ce/Ce* values around 0.6, and no redox-sensitive elements enriched, indicating that oxygenation did occur in the shallow water on the northwestern margin of the Yangtze Platform and redox conditions of the shallow water fluctuated from relatively oxygenated to anoxic and then back to oxygenated again. We propose that the anoxia appeared in middle of the Beiwan time may associate with the anoxic upwelled water. On one hand, abundant nutrients were brought in by this upwelling event, which stimulated the photosynthetic carbon fixation and increased the organic carbon burial under this anoxic condition, causing a peak of 3.6-in γ 13 C. On the other hand, because the anoxic upwelled water replaced the oxic shallow water, together with the increasing organic matter in the water column, bacterial sulfate reduction was enhanced and therefore quickly reduced the sulfate concentration, which eventually caused γ 34 S increasing to 50- However, as the upwelling gradually disappeared, γ 13 C and γ 34 SCAS values decreased as well in the late Beiwan time, indicating the shallow water went back to suboxic or oxic again.