Cenozoic history of phosphogenesis recorded in the ferromanganese crusts of central and western Pacific seamounts: Implications for deepwater circulation and phosphorus budgets
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Title
- Cenozoic history of phosphogenesis recorded in the ferromanganese crusts of central and western Pacific seamounts: Implications for deepwater circulation and phosphorus budgets
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Author(s)
- Hyeong, Kiseong; Kim, Jonguk; Yoo, Chan Min; Moon, Jai-Woon; Seo, Inah
- KIOST Author(s)
- Hyeong, Ki Seong(형기성); Kim, Jonguk(김종욱); Yoo, Chan Min(유찬민)
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Alternative Author(s)
- 형기성; 김종욱; 유찬민; 문재운; 서인아
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Publication Year
- 2013-12-15
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Abstract
- 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 Sr-87/Sr-86 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 12 Ma, and it peaked at the Eocene/Oligocene (E/O) transition (similar to 34 Ma). 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 12 Ma 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 12 Ma. 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 12 Ma justify further study. (C) 2013 Elsevier B.V. All rights reserved.
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ISSN
- 0031-0182
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/3030
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DOI
- 10.1016/j.palaeo.2013.09.012
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Bibliographic Citation
- PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, v.392, pp.293 - 301, 2013
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Publisher
- ELSEVIER SCIENCE BV
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Subject
- STRONTIUM ISOTOPE STRATIGRAPHY; CENTRAL NORTH PACIFIC; ICE-SHEET DEVELOPMENT; DELTA-C-13 EXCURSIONS; CALCITE COMPENSATION; OCEAN CIRCULATION; MANGANESE CRUST; SOUTH-ATLANTIC; MIDDLE EOCENE; SEA-WATER
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Keywords
- Phosphorite; Seamount; Phosphogenetic episode; Pacific; Phosphorus cycle; Bottom current
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Type
- Article
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Language
- English
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Document Type
- Article
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