globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.09.012
论文题名:
Cenozoic history of phosphogenesis recorded in the ferromanganese crusts of central and western Pacific seamounts: Implications for deepwater circulation and phosphorus budgets
作者: Hyeong K.; Kim J.; Yoo C.M.; Moon J.-W.; Seo I.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 392
起始页码: 293
结束页码: 301
语种: 英语
英文关键词: Biogeochemical cycles ; Bottom current ; Currents ; Pacific ; Phosphogenetic episode ; Phosphorite ; Phosphorus cycle ; Seamount ; Upwelling
英文摘要: Ages of seamount phosphatization episodes have been revised for 14 mid-plate seamounts in the western and central Pacific using the most up-to-date marine Sr isotope curve and 87Sr/86Sr data from the literature. The new ages provide a composite geologic history of phosphatization consistent with Cenozoic climate history. Phosphatization on mid-Pacific seamounts took place only between 36 and 12Ma, and it peaked at the Eocene/Oligocene (E/O) transition (~34Ma). The unprecedented appearance of prominent amounts of phosphorites at the E/O transition, and frequent recurrences of it afterwards, suggests that a new mechanism came into play at that time, namely the intensification of the advective flow of bottom water, which accelerated the phosphorus cycle. In contrast, the absence of phosphorites younger than 12Ma suggests another fundamental change in process, associated with the shift to a dry and cold climate that probably resulted in a decrease in the riverine input of labile phosphorus. The drastic decrease in the frequency of hiatuses in ocean-floor depositional records also indicates weakened bottom currents as a possible explanation for the absence of seamount phosphorite since 12Ma. A phosphorus flux is a critical variable in modeling the response of the Earth system to climate forcing in the geologic past. Thus, the changes in phosphorus flux across the E/O boundary and around 12Ma justify further study. © 2013 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69539
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作者单位: Deep-Sea and Seabed Resources Research Division, Korea Institute of Ocean Science and Technology, Ansan, South Korea; School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea

Recommended Citation:
Hyeong K.,Kim J.,Yoo C.M.,et al. Cenozoic history of phosphogenesis recorded in the ferromanganese crusts of central and western Pacific seamounts: Implications for deepwater circulation and phosphorus budgets[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,392
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