PHOSPHOGENSIS RECORDED IN CO-RICH CRUSTS OF NORTHWEST PACIFIC SEAMOUNTS

Title
PHOSPHOGENSIS RECORDED IN CO-RICH CRUSTS OF NORTHWEST PACIFIC SEAMOUNTS
Author(s)
형기성; 김종욱; 문재운; 이경용; 김기현
KIOST Author(s)
Hyeong, Ki Seong(형기성)Kim, Jong Uk(김종욱)Moon, Jai Woon(문재운)
Publication Year
2006-06-01
Abstract
To investigate Cenozoic episodes of phosphogenesis and its possible trigger mechanism, seamount phosphorites in the northwest Pacific was dated using Sr isotope ratios. In addition, published Pacific seamount phosporite Sr isotope data were compiled and new ages were assigned to them with a newly published 87Sr/86Sr-age curve (LOWESS v.3) to minimize biases due to inconsistent adaptation of different seawater Sr-age curve model. Newly assigned ages were as much as 5 million years younger than the published ages. This study identified two major episode of phosphatization at 21-23 Ma (n=10) and 33-36 Ma (n=21) with two additional minor events at 17 Ma (n=2) and 25 Ma (n=3) during Cenozoic. The two major phosphatization episodes corresponded to Mi-1 and Oi-1 glaciation that occurred at Oligocene/Miocene and Eocene/Oligocene epoch boundaries, respectively. Minor two events were also occurred in a series of smaller scale glaciations followed by Mi-1 and Oi-1. Mi-1 and Oi-1 were accompanied with reorganization of the climate/ocean system as evidenced by positive oxygen and carbon isotope excursions, major drop in the carbonate compensation depth, and global wide shifts in biological community. This climatic transition likely intensified the ocean circulation and accelerated rate of turnover, which supplied dissolved phosphorus for the formation of seamount phosphorites.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/30993
Bibliographic Citation
Minerals of the Ocean, pp.62, 2006
Publisher
VNIIOkeangeologia
Type
Conference
Language
English
Publisher
VNIIOkeangeologia
Related Researcher
Research Interests

Deep seabed exploration,Geochemistry,심해저자원탐사,지화학

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