Cenozoic history of phosphogenesis recorded in the ferromanganese crusts of central and western Pacific seamounts: Implications for deepwater circulation and phosphorus budgets SCIE SCOPUS

Cited 13 time in WEB OF SCIENCE Cited 14 time in Scopus
Title
Cenozoic history of phosphogenesis recorded in the ferromanganese crusts of central and western Pacific seamounts: Implications for deepwater circulation and phosphorus budgets
Author(s)
Hyeong, Kiseong; Kim, Jonguk; Yoo, Chan Min; Moon, Jai-Woon; Seo, Inah
KIOST Author(s)
Hyeong, Kiseong(형기성)Kim, Jonguk(김종욱)Yoo, Chan Min(유찬민)Moon, Jai Woon(문재운)
Publication Year
2013-12-15
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.
ISSN
0031-0182
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3030
DOI
10.1016/j.palaeo.2013.09.012
Bibliographic Citation
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, v.392, pp.293 - 301, 2013
Publisher
ELSEVIER SCIENCE BV
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
Keywords
Phosphorite; Seamount; Phosphogenetic episode; Pacific; Phosphorus cycle; Bottom current
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCIENCE BV
Related Researcher
Research Interests

Deep seabed exploration,Geochemistry,심해저자원탐사,지화학

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