| Os isotope dating and growth hiatuses of Co-rich crust from central Pacific |
| |
| 摘 要： | 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 75-80 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 divi- sion 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 re- sults 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.
|
| 收稿时间： | 21 November 2006 |
Os isotope dating and growth hiatuses of Co-rich crust from central Pacific |
| |
| Authors: | JiangShan Li NianQiao Fang WenJun Qu Xuan Ding LianFeng Gao ChangHang Wu ZhenGuo Zhang |
| |
| Institution: | (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 |
| |
| Abstract: | 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 75-80 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 divi- sion 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 re- sults 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. |
| |
| Keywords: | central Pacific Co-rich crust Os isotope dating growth hiatus |
| 本文献已被 SpringerLink 等数据库收录！ |
|
