| 西北太平洋富钴结壳的钙质超微化石地层学研究及意义 |
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| 关键词:northwestern Pacific seamount Co-rich ferromanganese crust calcareous nannofossil biostratigraphy research significance |
| 基金项目:国家自然科学基金资助项目(编号:40373002) |
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| Calcareous Nannofossil Biostratigraphy of Co-Rich Crusts from Northwestern Pacific and Its Significance |
| Calcareous nanofossils in CHA56 Co-rich crust from the Northwestern Pacific Seamount were analyzed to estimate their depositional ages.The crust has three structural layers,i.e.,compact upper layer,porous middle layer and compact lower layer.Studies show that the porous middle layer was formed in the period from Late Miocene to Late Pliocene(0.5～11.9 Ma),whereas the lower layer from Late Paleocene to Late Oligocene(56.3～23.2 Ma).Sedimentation hiatus was also observed.The environmental change in Pacific was caused by the change of Drake Passage around the O/M boundary,probably corresponding to the changes in structure,color and luster,and elemental composition in the middle and lower layer.The boundary between the middle layer and the lower layer serves as an important message of the growth age. |
| PAN Jia-hua,ZHANG Jing,LIU Shu-qin,WAN Xiao-qiao.2007.Calcareous Nannofossil Biostratigraphy of Co-Rich Crusts from Northwestern Pacific and Its Significance[J].Acta Geoscientica Sinica,28(5):411-417. |
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