Mineralogical and geochemical compositions of the eolian dust from the northeast equatorial Pacific and their implications on paleolocation of the Intertropical Convergence Zone SCIE SCOPUS

Cited 37 time in WEB OF SCIENCE Cited 41 time in Scopus
Title
Mineralogical and geochemical compositions of the eolian dust from the northeast equatorial Pacific and their implications on paleolocation of the Intertropical Convergence Zone
Author(s)
Hyeong, K; Park, SH; Yoo, CM; Kim, KH
KIOST Author(s)
Hyeong, Ki Seong(형기성)Yoo, Chan Min(유찬민)
Alternative Author(s)
형기성; 유찬민; 김기현
Publication Year
2005-02-12
Abstract
Eolian components of a 328-cm-long piston core collected from the northeast equatorial Pacific at 16degrees12'N and 125degrees59'W were investigated for mineral and geochemical compositions in order to constrain the sources of dust and determine the latitudinal position of the Intertropical Convergence Zone (ITCZ) recorded in the core. The eolian components below 250 cm are characterized by smectite- and phillipsite-rich mineral composition, depleted rare earth elements (REEs), and high Eu/Sm ratios, indicative of volcanic-rich composition. These characteristics are found in equatorial and south Pacific surface sediments, of which eolian particles are supplied from Central and South America. In contrast, eolian components above 250 cm are characterized by quartz- and illite-rich mineralogy, and more shale-like REE and trace element compositions, which are common in surface sediments of the central Pacific north of the ITCZ, where eolian particles are sourced from the Asia and North America. The observed changes are attributed to the shifting of its eolian sources from the Central and South America to the China and North America across the hemispheric dust barrier of the ITCZ. This result suggests that smectite- illite transition, a phenomenon that smectite amount increases over illite at a depth, can be used as a tracking tool for the paleolocation of the ITCZ in the northeast and central Pacific. Backtrack path construction of Pacific plate indicates paleolocation of the ITCZ north of 12degreesN (+/-2degrees) prior to late Miocene.
ISSN
0883-8305
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5098
DOI
10.1029/2004PA001053
Bibliographic Citation
PALEOCEANOGRAPHY, v.20, no.1, 2005
Publisher
AMER GEOPHYSICAL UNION
Subject
FOSSIL FISH TEETH; STRONTIUM ISOTOPE STRATIGRAPHY; ATMOSPHERIC CIRCULATION; DEEP-SEA; LATE PLEISTOCENE; CORE LL44-GPC3; ND ISOTOPES; SEAWATER SR; OCEAN; SEDIMENTS
Type
Article
Language
English
Document Type
Article
Publisher
AMER GEOPHYSICAL UNION
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