Paleo-latitude of the Intertropical Convergence Zone in the Northeast Pacific during Late Cenozoic SCOPUS KCI

DC Field Value Language
dc.contributor.author Hyeong, K. -
dc.contributor.author Kim, K.-H. -
dc.contributor.author Chi, S.-B. -
dc.contributor.author Yoo, C.M. -
dc.date.accessioned 2020-04-20T15:40:24Z -
dc.date.available 2020-04-20T15:40:24Z -
dc.date.created 2020-01-28 -
dc.date.issued 2004 -
dc.identifier.issn 1598-141X -
dc.identifier.uri https://sciwatch.kiost.ac.kr/handle/2020.kiost/5351 -
dc.description.abstract The Intertropical Convergence Zone (ITCZ), where the southeast and northeast trade winds converge, is the effective climatological barrier that separates the southern and northern hemispheres in dust budget. Asian and N. American dusts dominate in the Pacific north of the ITCZ, while Central and S. American dust prevails south of the ITCZ. In order to understand the nature of latitudinal and depth-related variations of mineral composition in terms of relative position to the ITCZ, deep-sea core sediments were collected from 9°N to 17°N at a 2° interval along the 131.5°W meridian and analyzed for mineral composition. The amount of illite in surface sediments decreases gradually from 65% at 17°N to 31% at 9°N. In contrast, smectite increases from 11% to 56% southward. The observed mineralogical, variation toward the ITCZ is attributed to the increased supply of volcaniclastic material transported via the southeast trade winds from the Central and South America source regions. Smectite-illite transition, a phenomenon that the amount of smectite increases over illite, occurs at around 10°N, the northern margin of the ITCZ. This result indicates that the change in latitudinal position of the ITCZ in geologic past could be recorded as a form of smectite-illite transition in deep-sea cores. The studied cores show down-core variation of mineral composition from illite-rich at the surface to smectite-rich clay suit at depths, similar to the latitudinal variation. The smectite-illite transitions observed in these cores are likely the records of changes in latitudinal position of the ITCZ. The depth and age of smectite-illite transition is getting shallower and younger toward equator, implying that the ITCZ was located farther north during late Tertiary and has shifted southward to the present position of 5°N-10°N. -
dc.description.uri 3 -
dc.language Korean -
dc.publisher Korea Ocean Research and Development Institute -
dc.subject Cenozoic -
dc.subject deep sea -
dc.subject deep-sea sediment -
dc.subject intertropical convergence zone -
dc.subject mineralogy -
dc.subject paleolatitude -
dc.subject sediment core -
dc.subject smectite -
dc.subject Pacific Ocean -
dc.subject Pacific Ocean (Northeast) -
dc.title Paleo-latitude of the Intertropical Convergence Zone in the Northeast Pacific during Late Cenozoic -
dc.type Article -
dc.citation.endPage 253 -
dc.citation.startPage 245 -
dc.citation.title Ocean and Polar Research -
dc.citation.volume 26 -
dc.citation.number 2 -
dc.contributor.alternativeName 형기성 -
dc.contributor.alternativeName 김기현 -
dc.contributor.alternativeName 지상범 -
dc.contributor.alternativeName 유찬민 -
dc.identifier.bibliographicCitation Ocean and Polar Research, v.26, no.2, pp.245 - 253 -
dc.identifier.doi 10.4217/OPR.2004.26.2.245 -
dc.identifier.scopusid 2-s2.0-3543092135 -
dc.type.docType Article -
dc.identifier.kciid ART001118892 -
dc.description.journalClass 3 -
dc.subject.keywordPlus Cenozoic -
dc.subject.keywordPlus deep sea -
dc.subject.keywordPlus deep-sea sediment -
dc.subject.keywordPlus intertropical convergence zone -
dc.subject.keywordPlus mineralogy -
dc.subject.keywordPlus paleolatitude -
dc.subject.keywordPlus sediment core -
dc.subject.keywordPlus smectite -
dc.subject.keywordPlus Pacific Ocean -
dc.subject.keywordPlus Pacific Ocean (Northeast) -
dc.subject.keywordAuthor Deepsea sediment -
dc.subject.keywordAuthor ITCZ -
dc.subject.keywordAuthor Mineral composition -
dc.subject.keywordAuthor Northeast Pacific -
dc.description.journalRegisteredClass scopus -
dc.description.journalRegisteredClass kci -
Appears in Collections:
Marine Resources & Environment Research Division > Ocean Georesources Research Department > 1. Journal Articles
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