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Article: Geochemical and Nd isotopic variations in sediments of the South China Sea: A response to Cenozoic tectonism in SE Asia

TitleGeochemical and Nd isotopic variations in sediments of the South China Sea: A response to Cenozoic tectonism in SE Asia
Authors
KeywordsGeochemistry
Nd Isotope
Ocean Drilling Program
Sediments
South China Sea
Tectonism
Weathering
Issue Date2003
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epsl
Citation
Earth And Planetary Science Letters, 2003, v. 211 n. 3-4, p. 207-220 How to Cite?
AbstractSecular variations in geochemistry and Nd isotopic data have been documented in sediment samples at ODP Site 1148 in the South China Sea. Major and trace elements show significant changes at ca. 29.5 Ma and 26-23 Ma, whereas ε Nd values show a single change at ca. 26-23 Ma. Increases in Al/Ti, Al/K, Rb/Sr, and La/Lu ratios and a decrease in the Th/La ratio of the sediments beginning at 29.5 Ma are consistent with more intense chemical weathering in the source region. The abrupt change in Nd isotopes and geochemistry at ca. 26-23 Ma coincides with a major discontinuity in the sedimentology and physical properties of the sediments, implying a drastic change in sedimentary provenance and environment at the drill site. Comparison of the Nd isotopes of sediments from major rivers flowing into the South China Sea suggests that pre-27 Ma sediments were dominantly derived from a southwestern provenance (Indochina-Sunda Shelf and possibly northwestern Borneo), whereas post-23 Ma sediments were derived from a northern provenance (South China). This change in provenance from southwest to north was largely caused by ridge jumping during seafloor spreading of the South China Sea, associated with a southwestward expansion of the ocean basin crust and a global rise in sea level. Thus, the geochemical and Nd isotopic changes in the sediments at ODP Site 1148 are interpreted as a response to a major plate reorganization in SE Asia at ca. 25 Ma. © 2003 Elsevier Science B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151102
ISSN
2015 Impact Factor: 4.326
2015 SCImago Journal Rankings: 3.628
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, XHen_US
dc.contributor.authorWei, Gen_US
dc.contributor.authorShao, Len_US
dc.contributor.authorLiu, Yen_US
dc.contributor.authorLiang, Xen_US
dc.contributor.authorJian, Zen_US
dc.contributor.authorSun, Men_US
dc.contributor.authorWang, Pen_US
dc.date.accessioned2012-06-26T06:17:06Z-
dc.date.available2012-06-26T06:17:06Z-
dc.date.issued2003en_US
dc.identifier.citationEarth And Planetary Science Letters, 2003, v. 211 n. 3-4, p. 207-220en_US
dc.identifier.issn0012-821Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/151102-
dc.description.abstractSecular variations in geochemistry and Nd isotopic data have been documented in sediment samples at ODP Site 1148 in the South China Sea. Major and trace elements show significant changes at ca. 29.5 Ma and 26-23 Ma, whereas ε Nd values show a single change at ca. 26-23 Ma. Increases in Al/Ti, Al/K, Rb/Sr, and La/Lu ratios and a decrease in the Th/La ratio of the sediments beginning at 29.5 Ma are consistent with more intense chemical weathering in the source region. The abrupt change in Nd isotopes and geochemistry at ca. 26-23 Ma coincides with a major discontinuity in the sedimentology and physical properties of the sediments, implying a drastic change in sedimentary provenance and environment at the drill site. Comparison of the Nd isotopes of sediments from major rivers flowing into the South China Sea suggests that pre-27 Ma sediments were dominantly derived from a southwestern provenance (Indochina-Sunda Shelf and possibly northwestern Borneo), whereas post-23 Ma sediments were derived from a northern provenance (South China). This change in provenance from southwest to north was largely caused by ridge jumping during seafloor spreading of the South China Sea, associated with a southwestward expansion of the ocean basin crust and a global rise in sea level. Thus, the geochemical and Nd isotopic changes in the sediments at ODP Site 1148 are interpreted as a response to a major plate reorganization in SE Asia at ca. 25 Ma. © 2003 Elsevier Science B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epslen_US
dc.relation.ispartofEarth and Planetary Science Lettersen_US
dc.rightsEarth and Planetary Science Letters. Copyright © Elsevier BV.-
dc.subjectGeochemistryen_US
dc.subjectNd Isotopeen_US
dc.subjectOcean Drilling Programen_US
dc.subjectSedimentsen_US
dc.subjectSouth China Seaen_US
dc.subjectTectonismen_US
dc.subjectWeatheringen_US
dc.titleGeochemical and Nd isotopic variations in sediments of the South China Sea: A response to Cenozoic tectonism in SE Asiaen_US
dc.typeArticleen_US
dc.identifier.emailSun, M:minsun@hku.hken_US
dc.identifier.authoritySun, M=rp00780en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0012-821X(03)00229-2en_US
dc.identifier.scopuseid_2-s2.0-0038682660en_US
dc.identifier.hkuros81700-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0038682660&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume211en_US
dc.identifier.issue3-4en_US
dc.identifier.spage207en_US
dc.identifier.epage220en_US
dc.identifier.isiWOS:000183792400001-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridLi, XH=35229968100en_US
dc.identifier.scopusauthoridWei, G=24330125600en_US
dc.identifier.scopusauthoridShao, L=35093273300en_US
dc.identifier.scopusauthoridLiu, Y=36072260300en_US
dc.identifier.scopusauthoridLiang, X=7401735389en_US
dc.identifier.scopusauthoridJian, Z=35858258200en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridWang, P=35276106900en_US

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