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Article: Behaviour of chemical elements during weathering of pyroclastic rocks, Hong Kong

TitleBehaviour of chemical elements during weathering of pyroclastic rocks, Hong Kong
Authors
KeywordsClay minerals
Geochemistry
Hong Kong
Pyroclastic rocks
Weathering
Issue Date2001
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/envint
Citation
Environment International, 2001, v. 26 n. 5-6, p. 359-368 How to Cite?
AbstractThe behaviour of whole-rock major, trace and rare earth elements (REE) during weathering under subtropical conditions is examined along a profile developed over crystal-vitric tuffs with eutaxitic texture. The intensity of weathering within the profile varies erratically, indicating weathering processes operate over different scales. Quartz, K-feldspar, plagioclase and biotite are the main primary minerals, whereas clays, sesquioxides, sericite and chlorite are the alteration products. Kaolinite, halloysite and illite-mica are the dominant clay minerals present in significantly varying proportions. Two competing processes, namely leaching and fixation, are the main regulators of variations in mostly major and some trace element concentrations along the profile. In general, as the intensity of weathering increases, Ca, Na, K, Sr±Si decrease, while Fe, Ti, Al and loss of ignition (LOI) increase. Likewise, the intensity of negative Eu-anomaly decreases while the intensity of negative Ce-anomaly and the La/Lu and Sm/Nd ratios increases. In detail, however, the behaviour of chemical elements cannot be solely explained in terms of the degree of weathering. This study makes it clearly evident that the type and abundance of sesquioxides and clay minerals can significantly modify the geochemical signatures of weathering processes. © 2001 Elsevier Science Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72827
ISSN
2015 Impact Factor: 5.929
2015 SCImago Journal Rankings: 2.684
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorMalpas, Jen_HK
dc.contributor.authorDuzgorenAydin, NSen_HK
dc.contributor.authorAydin, Aen_HK
dc.date.accessioned2010-09-06T06:45:28Z-
dc.date.available2010-09-06T06:45:28Z-
dc.date.issued2001en_HK
dc.identifier.citationEnvironment International, 2001, v. 26 n. 5-6, p. 359-368en_HK
dc.identifier.issn0160-4120en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72827-
dc.description.abstractThe behaviour of whole-rock major, trace and rare earth elements (REE) during weathering under subtropical conditions is examined along a profile developed over crystal-vitric tuffs with eutaxitic texture. The intensity of weathering within the profile varies erratically, indicating weathering processes operate over different scales. Quartz, K-feldspar, plagioclase and biotite are the main primary minerals, whereas clays, sesquioxides, sericite and chlorite are the alteration products. Kaolinite, halloysite and illite-mica are the dominant clay minerals present in significantly varying proportions. Two competing processes, namely leaching and fixation, are the main regulators of variations in mostly major and some trace element concentrations along the profile. In general, as the intensity of weathering increases, Ca, Na, K, Sr±Si decrease, while Fe, Ti, Al and loss of ignition (LOI) increase. Likewise, the intensity of negative Eu-anomaly decreases while the intensity of negative Ce-anomaly and the La/Lu and Sm/Nd ratios increases. In detail, however, the behaviour of chemical elements cannot be solely explained in terms of the degree of weathering. This study makes it clearly evident that the type and abundance of sesquioxides and clay minerals can significantly modify the geochemical signatures of weathering processes. © 2001 Elsevier Science Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/envinten_HK
dc.relation.ispartofEnvironment Internationalen_HK
dc.subjectClay mineralsen_HK
dc.subjectGeochemistryen_HK
dc.subjectHong Kongen_HK
dc.subjectPyroclastic rocksen_HK
dc.subjectWeatheringen_HK
dc.titleBehaviour of chemical elements during weathering of pyroclastic rocks, Hong Kongen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0160-4120&volume=26&spage=350&epage=368&date=2001&atitle=Behaviour+of+chemical+elements+during+weathering+of+pyroclastic+rocks,+Hong+Kong.en_HK
dc.identifier.emailMalpas, J: jgmalpas@hku.hken_HK
dc.identifier.authorityMalpas, J=rp00059en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S0160-4120(01)00013-7en_HK
dc.identifier.pmid11392752-
dc.identifier.scopuseid_2-s2.0-0034998019en_HK
dc.identifier.hkuros64640en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034998019&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume26en_HK
dc.identifier.issue5-6en_HK
dc.identifier.spage359en_HK
dc.identifier.epage368en_HK
dc.identifier.isiWOS:000168817200012-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridMalpas, J=7006136845en_HK
dc.identifier.scopusauthoridDuzgorenAydin, NS=6602460166en_HK
dc.identifier.scopusauthoridAydin, A=7102287997en_HK

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