期刊
SCIENCE
卷 328, 期 5974, 页码 80-83出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1182369
关键词
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资金
- NSF of China [EAR-0720362, EAR-0719493, 40532012]
- Chinese Academy of Sciences [KZCX3-SW-141]
- NASA Astrobiology Institute
- Agouron Institute
- Division Of Earth Sciences
- Directorate For Geosciences [0745605] Funding Source: National Science Foundation
The Ediacaran Period (635 to 542 million years ago) was a time of fundamental environmental and evolutionary change, culminating in the first appearance of macroscopic animals. Here, we present a detailed spatial and temporal record of Ediacaran ocean chemistry for the Doushantuo Formation in the Nanhua Basin, South China. We find evidence for a metastable zone of euxinic (anoxic and sulfidic) waters impinging on the continental shelf and sandwiched within ferruginous [Fe(II)-enriched] deep waters. A stratified ocean with coeval oxic, sulfidic, and ferruginous zones, favored by overall low oceanic sulfate concentrations, was maintained dynamically throughout the Ediacaran Period. Our model reconciles seemingly conflicting geochemical redox conditions proposed previously for Ediacaran deep oceans and helps to explain the patchy temporal record of early metazoan fossils.
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