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REE and Sr-Nd Isotopic Composition of the Shelf Sediments around Jeju Island, Korea
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제주도 주변 대륙붕 퇴적물의 REE와 Sr-Nd 동위원소 조성

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Type
Academic journal
Author
Kim, Tae-Joung (제주대학교 지구해양과학과) Youn, Jeungsu (제주대학교 지구해양과학과)
Journal
한국지구과학회 한국지구과학회지 한국지구과학회지 제33권 제6호 KCI Accredited Journals
Published
2012.1
Pages
481 - 496 (16page)

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REE and Sr-Nd Isotopic Composition of the Shelf Sediments around Jeju Island, Korea
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REE, major and trace elements, and Sr-Nd isotopic ratios of surface sediments around Jeju Island were analyzed for identifying the origin of the sediments. The Chemical Index of Alteration (CIA) between 44.2 to 68.9 (av. 59.4) shows a similarity with the Huanghe sediment. The most sediments found within the study areas show a very similar chondrite-normalized REE pattern that has enriched LREE ($La_{(N)}/Sm_{(N)}$ >3) and small negative Eu anomaly, typically of average shales. The UCC-nornalized REE patterns of the southwestern offshore sediment samples show a very similar pattem with the Changjiang sediment with enriched in most REE and more convex REE pattern than those of the Huanghe and Keum rivers sediments, which indicates that the Changjiang River's suspended sediments have been transported into the western part of Jeju Island. The $^{87}Sr/^{86}Sr$ isotopic ratios vs ${\varepsilon}_{Nd}(0)$ values were thus used as a tracer to discriminate the provenance of sediments in the study area. Based on the discriminated diagram, it clearly showed that most sediments in the western and northwestern part were closely plotted with sediments of the Huanghe River. However, the sediments in the southwestern part near the Changjianf estuary were closely plotted with submerged delta sediments of the Changjiang River. In contrast, the sediment samples of the northeastern part showed discriminative figures from those of the Chinese rivers. It suggests that sediments around Jeju Island must be originated from diverse sources.
#표층퇴적물 #희토류원소 #중국과 한국의 강 #제주도 주변해역 #Sr-Nd 동위원소비

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남승일 / 2003 / 마지막 해빙기 해침 이후 동중국해 북부해역과 황해의 고환경 변화 / 지질학회지 39(2):149~160 google schola 박용안 / 1994 / 한국서해중부해역 대륙붕 퇴적물의 분포와 퇴적작용 / 한국해양학회지 29:357~365 google schola 이용일 / 2002 / 용인시 평창리 구석기유적발굴지 고토양 특성과 이의 고고지질학적 적용 / 지질학회지 38(4):471~489 google schola 임동일 / 2007 / 한국과 중국의 강 퇴적물의 주성분 원소 함량 특성: 황해 니질 퇴적물의 기원지 연구를 위한 잠재적 추적자 / 한국지구과학회지 28(3):311~323 dbpia 윤정수 / 2008 / 제주도 서부해역 표층퇴적물의 지화학적 조성과 기원 연구 / 한국지구과학회지 29(4):328~340 dbpia

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