期刊
JOURNAL OF THE GEOLOGICAL SOCIETY
卷 168, 期 3, 页码 805-815出版社
GEOLOGICAL SOC PUBL HOUSE
DOI: 10.1144/0016-76492010-132
关键词
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资金
- Ministry of Science and Technology of China [2011CB808805]
- Natural Science Foundation of China [40532012, 40873007, 40603021]
- US National Science Foundation [EAR-0745825]
- Division Of Earth Sciences
- Directorate For Geosciences [0745825] Funding Source: National Science Foundation
Major and trace element, including REE, concentrations of the Doushantuo cap carbonate (c. 635 Ma) in South China show enrichment in Fe, Mn and redox-sensitive elements and slightly negative Ce anomalies, indicating anoxic environments during cap carbonate precipitation. High Fe-T/Al ratios but very low concentration of extractable pyrites suggest ferruginous rather than euxinic conditions. The REE + Y patterns of samples show enrichment of heavy REE (HREE), positive Eu anomalies and positive Yanomalies, implying a hydrothermal origin for elevated concentration of Fe, Mn and redox-sensitive elements. The results suggest that ferruginous Ediacaran oceans may have rooted from hydrothermally induced iron accumulation in severely glaciated Cryogenian oceans.
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