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Article: The composition of shales from the Ordos Basin, China: Effects of source weathering and diagenesis

TitleThe composition of shales from the Ordos Basin, China: Effects of source weathering and diagenesis
Authors
KeywordsDiagenesis
Ordos Basin Of China
Ree
Shales
Source Weathering
Issue Date1998
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/sedgeo
Citation
Sedimentary Geology, 1998, v. 116 n. 1-2, p. 129-141 How to Cite?
AbstractThe Ordos basin, situated in northwestern China, is the biggest Mesozoic terrigenous sedimentary basin developed on the North China Platform. The geochemical data imply that shales from the Ordos basin were mainly derived from a source area with an average Archaean granite composition. High Na2O contents, very limited variation of Ti/Zr, and ratios of (Gd/Yb)N higher than 2.0 indicate that Ordos shales are less mature than typical post-Archaean shales such as NASC and PAAS. Highly variable CIA values (chemical index of weathering) indicate that most Ordos shales are less weathered than NASC and PAAS. Ratios of (La/Sm)N and total REE contents for the Ordos shales are positively correlated with CIA, whereas those of (Gd/Yb)N inversely vary with CIA. These suggest that the weathering of source rocks is responsible for the REE fractionation in the shales of the Ordos basin. Depletion of Eu in clay-sized fractions of the Ordos shales decreases with enhanced crystallinity of illite. Considering that ratios of Fe3+/Fe2+ in the shales decrease with the increase of crystallinity of chlorites, we propose that Eu anomalies in shales are directly related to the reduction of iron during burial diagenesis. © 1998 Elsevier Science B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/150934
ISSN
2015 Impact Factor: 2.236
2015 SCImago Journal Rankings: 1.513
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, Len_US
dc.contributor.authorSun, Men_US
dc.contributor.authorWang, Sen_US
dc.contributor.authorYu, Xen_US
dc.date.accessioned2012-06-26T06:15:03Z-
dc.date.available2012-06-26T06:15:03Z-
dc.date.issued1998en_US
dc.identifier.citationSedimentary Geology, 1998, v. 116 n. 1-2, p. 129-141en_US
dc.identifier.issn0037-0738en_US
dc.identifier.urihttp://hdl.handle.net/10722/150934-
dc.description.abstractThe Ordos basin, situated in northwestern China, is the biggest Mesozoic terrigenous sedimentary basin developed on the North China Platform. The geochemical data imply that shales from the Ordos basin were mainly derived from a source area with an average Archaean granite composition. High Na2O contents, very limited variation of Ti/Zr, and ratios of (Gd/Yb)N higher than 2.0 indicate that Ordos shales are less mature than typical post-Archaean shales such as NASC and PAAS. Highly variable CIA values (chemical index of weathering) indicate that most Ordos shales are less weathered than NASC and PAAS. Ratios of (La/Sm)N and total REE contents for the Ordos shales are positively correlated with CIA, whereas those of (Gd/Yb)N inversely vary with CIA. These suggest that the weathering of source rocks is responsible for the REE fractionation in the shales of the Ordos basin. Depletion of Eu in clay-sized fractions of the Ordos shales decreases with enhanced crystallinity of illite. Considering that ratios of Fe3+/Fe2+ in the shales decrease with the increase of crystallinity of chlorites, we propose that Eu anomalies in shales are directly related to the reduction of iron during burial diagenesis. © 1998 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/sedgeoen_US
dc.relation.ispartofSedimentary Geologyen_US
dc.rightsSedimentary Geology. Copyright © Elsevier BV.-
dc.subjectDiagenesisen_US
dc.subjectOrdos Basin Of Chinaen_US
dc.subjectReeen_US
dc.subjectShalesen_US
dc.subjectSource Weatheringen_US
dc.titleThe composition of shales from the Ordos Basin, China: Effects of source weathering and diagenesisen_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.scopuseid_2-s2.0-0004989414en_US
dc.identifier.hkuros47069-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0004989414&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume116en_US
dc.identifier.issue1-2en_US
dc.identifier.spage129en_US
dc.identifier.epage141en_US
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridZhang, L=34769304700en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridWang, S=48961324400en_US
dc.identifier.scopusauthoridYu, X=7404115860en_US
dc.customcontrol.immutablesml 130311-

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