Os isotope dating and growth hiatuses of Co-rich crust from central Pacific
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- 作者：JiangShan Li (1) (2) (3)
NianQiao Fang (1)
WenJun Qu (4)
Xuan Ding (1)
LianFeng Gao (5)
ChangHang Wu (1)
ZhenGuo Zhang (5) - 关键词：central Pacific ; Co ; rich crust ; Os isotope dating ; growth hiatus
- 刊名：Science China Earth Sciences
- 出版年：2008
- 出版时间：October 2008
- 年：2008
- 卷：51
- 期：10
- 页码：1452-1459
- 全文大小：1067KB
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NianQiao Fang (1)
WenJun Qu (4)
Xuan Ding (1)
LianFeng Gao (5)
ChangHang Wu (1)
ZhenGuo Zhang (5)
1. School of Marine, China University of Geosciences, Beijing, 100083, China
2. Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, First Institute of Oceanography, State Oceanic Administration, Qingdao, 266061, China
3. Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China
4. National Research Centre for Geoanalysis, Beijing, 100037, China
5. Hebei Polytechnic University, Tangshan, 063009, China - ISSN：1869-1897
文摘
Up to now, accurate determination of the growth age and hiatuses of the Co-rich crust is still a difficult work, which constrains the researches on the genesis, growth process, controlling factors, regional tectonics, paleo-oceanographic background, etc. of the Co-rich crust. This paper describes our work in determining the initial growth age of the Co-rich crust to be of the late Cretaceous Campanian Stage (about 75-0 Ma), by selecting the Co-rich crust with clear multi-layer structures in a central Pacific seamount for layer-by-layer sample analysis and using a number of chronological methods, such as Co flux dating, dating by correlation with 187Os/188Os evolution curves of seawater, and stratigraphic division by calcareous nannofossils. We have also discovered growth hiatuses with different time intervals in the early Paleocene, middle Eocene, late Eocene and early-middle Miocene, respectively. These results have provided an important age background for further researches on the Co-rich crust growth process and the paleo-oceanographic environment evolution thereby revealed in the said region.