The relationship between the growth process of the ferromanganese crusts in the Pacific seamount and Cenozoic ocean evolvement

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doi: 10.1007/s11430-009-0106-z
Author(s): Ding Xuan; Gao Lianfeng; Fang Nianqiao; Qu Wenjun; Liu Jian; Li Jiangshan
Author Affiliation(s): Primary:
China University of Geosciences, School of Marine Science, Beijing, China
Other:
Hebei Polytechnic University, China
National Geologic Experiment and Test Center, China
Guangzhou Marine Geological Survey, China
Volume Title: Science in China. Series D, Earth Sciences
Source: Science in China. Series D, Earth Sciences, 52(8), p.1091-1103. Publisher: Springer, co-published with Science in China Press, Beijing, China. ISSN: 1006-9313
Note: In English. 45 refs.; illus., incl. 1 table, sketch map
Summary: Based on the Os isotope stratigraphy together with the empirical growth rate models using Co concentrations, the growth ages of the ferromanganese crusts MHD79 and MP3D10 distributed in the seamount of the Pacific are confirmed. Through the contrast and research on the previous achievements including ODP Leg 144 and the crusts CD29-2, N5E-06 and N1-15 of the seamount of the Central Pacific, the uniform five growth and growth hiatus periods of them are found, and closely related to the Cenozoic ocean evolvement process. In the Paleocene Carbon Isotope Maximum (PCIM), the rise of the global ocean productivity promoted the growth of the seamount crust; the first growth hiatus (I) of the ferromanganese crust finished. In the Paleocene-Eocene Thermal Maximum (PETM), though the vertical exchange of seawater was weakened, the strong terrestrial chemical weathering led to the input of a great amount of the terrigenous nutrients, which made the bioproductivity rise, so there were no crust hiatuses. During 52-50 Ma, the early Eocene Optimum Climate (EECO), the two poles were warm, the latitudinal temperature gradient was small, the wind-driven sea circulation and upwelling activity were weak, the terrestrial weathering was also weakened, the open ocean bioproductivity decreased, and the ferromanganese crust had growth hiatus again (II). From early middle Eocene-late Eocene, Oligocene, it was a long-term gradually cooling process, the strengthening of the sea circulation and upwelling led to a rise of bioproductivity, and increase of the content of the hydrogenous element Fe, Mn and Co and the biogenous element Cu, Zn, so that was the most favorable stage for the growth of ferromanganese crust (growth periods III and IV) in the studied area. It is inferred that the hiatus III corresponding to the Eocene-Oligocene boundary relates to the global climate transformation, celestial body impact event in the Eocene-Oligocene transition. From the early to the middle Miocene, a large-scale growth hiatus (hiatus period IV) of the ferromanganese crust in the studied area is inferred to relate with temporary warm up climate and ephemeral withdrawal of Antarctic bottom water in the early Miocene. After that, the Antarctic ice sheets extended, the bottom water circumfluence strengthened, the ocean fertility increased, and the once interrupted crust continued to grow in the late Miocene (growth period V).
Year of Publication: 2009
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Cenozoic; Central Pacific; Chemostratigraphy; Early Eocene Optimum Climate; Eocene; Ferromanganese crusts; Geochemistry; Isotope ratios; Isotopes; Leg 144; Metals; Miocene; Neogene; Nodules; North Pacific; Northwest Pacific; ODP Site 871; ODP Site 872; ODP Site 873; ODP Site 874; ODP Site 875; ODP Site 876; ODP Site 877; ODP Site 878; Ocean Drilling Program; Ocean floors; Oligocene; Os-188/Os-187; Osmium; Pacific Ocean; Paleo-oceanography; Paleocene-Eocene Thermal Maximum; Paleoclimatology; Paleogene; Platinum group; Seamounts; Stable isotopes; Tertiary; West Pacific; Wodejebato Seamount
Coordinates: N053326 N053326 E1722040 E1722040
N100851 N100851 E1625157 E1625157
N115350 N115350 E1645513 E1645513
N120013 N120013 E1645623 E1645623
N120043 N120043 E1645626 E1645626
N121448 N121448 E1645554 E1645554
N120109 N120109 E1645518 E1645518
Record ID: 2012055769
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