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Article: In-situ gamma-ray spectrometric study of weathered volcanic rocks in Hong Kong

TitleIn-situ gamma-ray spectrometric study of weathered volcanic rocks in Hong Kong
Authors
KeywordsChemical weathering
Gamma-ray spectrometry
Hong Kong
Volcanic rocks
Weathering index
Issue Date2002
PublisherJohn Wiley & Sons Ltd. The Journal's web site is located at http://www3.interscience.wiley.com/cgi-bin/jhome/2388
Citation
Earth Surface Processes And Landforms, 2002, v. 27 n. 6, p. 613-625 How to Cite?
AbstractIn-situ gamma-ray spectrometry (GRS) measurements were conducted at 35 sites in Hong Kong where volcanic rocks with varying extent of weathering were exposed. Elemental analyses using X-ray fluorescence spectrometry and inductively coupled plasma-mass spectrometry were carried out on samples collected from these 35 plus 22 other locations to assess the feasibility of using the GRS method to quantify the extent of weathering. The Parker weathering index, varying within a range of 0.0-0.8 for the samples studied, was used as a geochemically based reference scheme for correlating the gamma-ray spectrometric results with the extent of weathering. For the former 35 sites, the concentrations of the three major radioelements, K. U. and Th, determined by in-situ GRS were compared to laboratory-determined values from the samples. The study revelas that no significant change occurs to the contents of the three radioelements during the initial state of weathering. But once the rocks become highly weathered, further progression of weathering is accompanied by a systematic removal of K and an increased dispersion of U and Th. The results show that K content, which is indicative of the extent of weathering, can be retrieved reliably with the gamma-ray spectrometry technique. The study has given support to the potential use of the downhole spectral gamma method for evaluation of weathering grade and the detection of subsurface clay-rich levels. Copyright © 2002 John Wiley & Sons. Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/73070
ISSN
2015 Impact Factor: 3.505
2015 SCImago Journal Rankings: 1.574
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChen, MQFen_HK
dc.contributor.authorChan, LSen_HK
dc.date.accessioned2010-09-06T06:47:46Z-
dc.date.available2010-09-06T06:47:46Z-
dc.date.issued2002en_HK
dc.identifier.citationEarth Surface Processes And Landforms, 2002, v. 27 n. 6, p. 613-625en_HK
dc.identifier.issn0197-9337en_HK
dc.identifier.urihttp://hdl.handle.net/10722/73070-
dc.description.abstractIn-situ gamma-ray spectrometry (GRS) measurements were conducted at 35 sites in Hong Kong where volcanic rocks with varying extent of weathering were exposed. Elemental analyses using X-ray fluorescence spectrometry and inductively coupled plasma-mass spectrometry were carried out on samples collected from these 35 plus 22 other locations to assess the feasibility of using the GRS method to quantify the extent of weathering. The Parker weathering index, varying within a range of 0.0-0.8 for the samples studied, was used as a geochemically based reference scheme for correlating the gamma-ray spectrometric results with the extent of weathering. For the former 35 sites, the concentrations of the three major radioelements, K. U. and Th, determined by in-situ GRS were compared to laboratory-determined values from the samples. The study revelas that no significant change occurs to the contents of the three radioelements during the initial state of weathering. But once the rocks become highly weathered, further progression of weathering is accompanied by a systematic removal of K and an increased dispersion of U and Th. The results show that K content, which is indicative of the extent of weathering, can be retrieved reliably with the gamma-ray spectrometry technique. The study has given support to the potential use of the downhole spectral gamma method for evaluation of weathering grade and the detection of subsurface clay-rich levels. Copyright © 2002 John Wiley & Sons. Ltd.en_HK
dc.languageengen_HK
dc.publisherJohn Wiley & Sons Ltd. The Journal's web site is located at http://www3.interscience.wiley.com/cgi-bin/jhome/2388en_HK
dc.relation.ispartofEarth Surface Processes and Landformsen_HK
dc.rightsEarth Surface Processes and Landforms. Copyright © John Wiley & Sons Ltd.en_HK
dc.subjectChemical weatheringen_HK
dc.subjectGamma-ray spectrometryen_HK
dc.subjectHong Kongen_HK
dc.subjectVolcanic rocksen_HK
dc.subjectWeathering indexen_HK
dc.titleIn-situ gamma-ray spectrometric study of weathered volcanic rocks in Hong Kongen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0197-9337&volume=27&spage=613&epage=625&date=2002&atitle=In-situ+gamma-ray+spectrometric+study+of+weathered+volcanic+rocks+in+Hong+Kongen_HK
dc.identifier.emailChan, LS:chanls@hku.hken_HK
dc.identifier.authorityChan, LS=rp00665en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/esp.336en_HK
dc.identifier.scopuseid_2-s2.0-0036610456en_HK
dc.identifier.hkuros70707en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036610456&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume27en_HK
dc.identifier.issue6en_HK
dc.identifier.spage613en_HK
dc.identifier.epage625en_HK
dc.identifier.isiWOS:000176639300003-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridChen, MQF=24167609500en_HK
dc.identifier.scopusauthoridChan, LS=7403540528en_HK

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