Growth of a polymetallic nodule from the northwestern continental margin of the South China Sea and its response to changes in the paleoceanographical environment of the Late Cenozoic
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- 作者：ZhenGuo Zhang (1) (2)
YuanSheng Du (1)
ChangHang Wu (3)
NianQiao Fang (4)
ShengXiong Yang (5)
Jian Liu (5)
ChengBing Song (5) - 关键词：polymetallic nodules ; growth process ; late Cenozoic ; paleoceanographical environment ; response ; northwestern continental margin of South China Sea
- 刊名：Science China Earth Sciences
- 出版年：2013
- 出版时间：March 2013
- 年：2013
- 卷：56
- 期：3
- 页码：453-463
- 全文大小：1130KB
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YuanSheng Du (1)
ChangHang Wu (3)
NianQiao Fang (4)
ShengXiong Yang (5)
Jian Liu (5)
ChengBing Song (5)
1. College of Mining Engineering, Hebei United University, Tangshan, 063009, China
2. Faculty of Earth Science, China University of Geosciences, Wuhan, 430074, China
3. Department of Environment Engineering and Chemistry, Luoyang Institute of Technology and Science, Luoyan, 471023, China
4. School of Ocean Science, China University of Geosciences, Beijing, 100083, China
5. Guangzhou Marine Geological Survey, The Ministry of Land and Resources of China, Guangzhou, 510075, China - ISSN：1869-1897
文摘
In the northern South China Sea, the accumulation of enormous quantities of terrigenous sediment during Cenozoic rendered well-developed polymetallic nodules very rare. In this study, we analyzed a polymetallic nodule from the northwestern continental margin of the South China Sea using microscopic mineralogical observation, electron probes, X-ray diffraction (XRD), ICP-MS, and Be isotope dating. We found the nodule’s shell layers rich in different types of microstructures, including columnar, laminar, stack-like, petal-like, and porphyritic structures. The major mineral components of the nodule are MnO2. Unlike nodules from the eastern Pacific basin, this nodule has high contents in Fe, Si, Al, and REEs but low contents in Mn, Cu, Co, and Ni. The Mn/Fe ratio is also low and the average REEs content is 1370.4 ppm. There is a strong positive anomaly of Ce; and the Be (beryllium) isotope dating shows the initial time of growth of the nodule to be about 3.29 Ma. The inner compact layer formed from 3.29 Ma to about 1.83 Ma. The laminar and stack-like structures and the low contents of the terrigenous elements such as Fe, Si, REE, and Al indicate the paleoceanographical environment with weak undersea currents and favorable oxidizing conditions. From 1.83 Ma to 0.73 Ma, the growth rate of the nodule increased by about 3%; the microstructures formed during this period are stack-like and columnar. The contents of Si and Al are increased by nearly 10%, indicating an increase of terrigenous sediment input in the northern South China Sea. The content of Ce is decreased by about 16%, indicating a significant weakening of the oxidizing conditions at the seabed. From 0.73 Ma to 0.69 Ma, the growth rate of the nodule rapidly rose up to 8.27 times that of the nodule’s average growth rate, and the contents of Fe, Al, and REEs in the layer also increased, forming a loose layer characterized by oolitic, granular, porphyritic, and petal-like structures, indicating the paleoceanographical environment with a high sedimemtation rate and abundant supply of terrigenous sediment in the northern South China Sea. From 0.69 Ma to 0.22 Ma, the growth rate of the nodule suddenly slowed and the outer compact layer formed. Contents of Fe, Si, REE, Al, Mn, Cu, Co, and Ni in this layer were significantly lower than in other layers. The main structures of the layer are laminar and fissure filling structures. These reflect the paleoceanographical environment with stable undersea currents, poor oxidizing conditions, and other conditions not conducive to nodule growth. The growth process of nodule S04-1DG-1 was found to respond sensitively to the changes of the paleoceanographical environment of the northern South China Sea during the late Cenozoic.