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Paleo-latitude of the Intertropical Convergence Zone in the Northeast Pacific during Late Cenozoic
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  • Journal title : Ocean and Polar Research
  • Volume 26, Issue 2,  2004, pp.245-253
  • Publisher : Korea Institute of Ocean Science & Technology
  • DOI : 10.4217/OPR.2004.26.2.245
 Title & Authors
Paleo-latitude of the Intertropical Convergence Zone in the Northeast Pacific during Late Cenozoic
Hyeong, Ki-Seong; Kim, Ki-Hyune; Chi, Sang-Bum; Yoo, Chan-Min;
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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 fhe 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 to at a interval along the meridian and analyzed for mineral composition. The amount of illite in surface sediments decreases gradually from 65% at to 31% at 9f. 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 , 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 .
ITCZ;Northeast Pacific;Deepsea sediment;Mineral composition;
 Cited by
북동태평양 해저퇴적물의 Be 연대측정,최헌수;공기수;엄인권;김지훈;

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지자기 방향변화 및 베릴륨 동위원소비를 이용한 북동 적도 태평양 주상시료의 층서확립,김원년;형기성;공기수;

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