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Article: Re-assessment of chemical weathering indices: Case study on pyroclastic rocks of Hong Kong

TitleRe-assessment of chemical weathering indices: Case study on pyroclastic rocks of Hong Kong
Authors
KeywordsClay Minerals
Geochemistry
Hong Kong
Pyroclastic Rocks
Sesquioxide
Weathering
Issue Date2002
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/enggeo
Citation
Engineering Geology, 2002, v. 63 n. 1-2, p. 99-119 How to Cite?
AbstractQuantitative and objective characterization of weathered states of rock by means of chemical weathering indices has significant potential in ground investigation practice. This paper reviews more than thirty different chemical indices and reassesses their variations along a weathered profile developed over pyroclastic rocks under subtropical conditions. Chemical weathering indices are principally based on the basic assumption that distributions of chemical elements as well as loss on ignition (LOI) content along the profile are mainly regulated by the degree of weathering. However, this study clearly demonstrates that the behavior of chemical elements and LOI during weathering depend not only on the degree of weathering, but also on microenvironmental conditions that control the type and abundance of clay minerals and sesquioxides and thus determine the level of heterogeneity of the profile. It is suggested that signatures of chemical weathering should be used to establish a framework for the interpretation of the heterogeneity level and the prediction of variability in engineering properties rather than for quick classifications using chemical weathering indices. © 2002 Elsevier Science B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/178222
ISSN
2015 Impact Factor: 2.196
2015 SCImago Journal Rankings: 1.810
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorDuzgorenAydin, NSen_US
dc.contributor.authorAydin, Aen_US
dc.contributor.authorMalpas, Jen_US
dc.date.accessioned2012-12-19T09:43:30Z-
dc.date.available2012-12-19T09:43:30Z-
dc.date.issued2002en_US
dc.identifier.citationEngineering Geology, 2002, v. 63 n. 1-2, p. 99-119en_US
dc.identifier.issn0013-7952en_US
dc.identifier.urihttp://hdl.handle.net/10722/178222-
dc.description.abstractQuantitative and objective characterization of weathered states of rock by means of chemical weathering indices has significant potential in ground investigation practice. This paper reviews more than thirty different chemical indices and reassesses their variations along a weathered profile developed over pyroclastic rocks under subtropical conditions. Chemical weathering indices are principally based on the basic assumption that distributions of chemical elements as well as loss on ignition (LOI) content along the profile are mainly regulated by the degree of weathering. However, this study clearly demonstrates that the behavior of chemical elements and LOI during weathering depend not only on the degree of weathering, but also on microenvironmental conditions that control the type and abundance of clay minerals and sesquioxides and thus determine the level of heterogeneity of the profile. It is suggested that signatures of chemical weathering should be used to establish a framework for the interpretation of the heterogeneity level and the prediction of variability in engineering properties rather than for quick classifications using chemical weathering indices. © 2002 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/enggeoen_US
dc.relation.ispartofEngineering Geologyen_US
dc.rightsEngineering Geology. Copyright © Elsevier BV.-
dc.subjectClay Mineralsen_US
dc.subjectGeochemistryen_US
dc.subjectHong Kongen_US
dc.subjectPyroclastic Rocksen_US
dc.subjectSesquioxideen_US
dc.subjectWeatheringen_US
dc.titleRe-assessment of chemical weathering indices: Case study on pyroclastic rocks of Hong Kongen_US
dc.typeArticleen_US
dc.identifier.emailMalpas, J: jgmalpas@hku.hken_US
dc.identifier.authorityMalpas, J=rp00059en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0013-7952(01)00073-4en_US
dc.identifier.scopuseid_2-s2.0-0036140911en_US
dc.identifier.hkuros84305-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036140911&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume63en_US
dc.identifier.issue1-2en_US
dc.identifier.spage99en_US
dc.identifier.epage119en_US
dc.identifier.isiWOS:000173435700009-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridDuzgorenAydin, NS=6602460166en_US
dc.identifier.scopusauthoridAydin, A=7102287997en_US
dc.identifier.scopusauthoridMalpas, J=7006136845en_US

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