File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Distribution of clay minerals along a weathered pyroclastic profile, Hong Kong

TitleDistribution of clay minerals along a weathered pyroclastic profile, Hong Kong
Authors
KeywordsClay Minerals
Hong Kong
Pyroclastic Rocks
Weathering
Issue Date2002
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/catena
Citation
Catena, 2002, v. 50 n. 1, p. 17-41 How to Cite?
AbstractThe distribution of clay minerals along a weathered profile developed over crystal-vitric tuffs are examined by X-ray diffractometry (XRD) and scanning electron microscopy (SEM) techniques. Chlorite and illite are the most abundant clay minerals in fresh and moderately decomposed rocks, respectively. Chlorite is limited to fresh samples, whereas illite and trace amounts of interstratified illite-smectite are ubiquitous along the profile. Halloysite and kaolinite are the dominant clay minerals in highly to completely decomposed rocks. Halloysite clusters in moderately decomposed samples provide clear evidence of crystallization from solution, whereas vermiform kaolinite books reveal evidence of transformation from illite in most samples. In general, as the intensity of weathering increases: (a) kaolin-to-illite and kaolinite-to-halloysite ratios increase; and (b) the morphology of halloysite varies from spheriodal clusters to tubular aggregates. It is concluded that the nature, type and abundance of clay minerals along the profile result from complex combinations of several different processes controlled mainly by three factors: the pre-weathering alteration history of parent rock, the degree of weathering, and micro-environmental conditions. The relative role of each factor can vary significantly within the same profile. As evidenced by mineralogical and petrographical characteristics, the nature and type of clay minerals in fresh and moderately decomposed rocks can be attributed to pre-weathering hydrothermal and/or deuteric alterations. On the other hand, the degree of weathering regulates the nature, type and abundance of clay minerals, particularly kaolin group minerals, in highly to completely decomposed rocks. Sesquioxides are sensitive to microenvironmetal conditions and can modify the distribution of clay minerals regardless of the degree of weathering of the rock. © 2002 Elsevier Science B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/178223
ISSN
2015 Impact Factor: 2.612
2015 SCImago Journal Rankings: 1.191
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.citationCatena, 2002, v. 50 n. 1, p. 17-41en_US
dc.identifier.issn0341-8162en_US
dc.identifier.urihttp://hdl.handle.net/10722/178223-
dc.description.abstractThe distribution of clay minerals along a weathered profile developed over crystal-vitric tuffs are examined by X-ray diffractometry (XRD) and scanning electron microscopy (SEM) techniques. Chlorite and illite are the most abundant clay minerals in fresh and moderately decomposed rocks, respectively. Chlorite is limited to fresh samples, whereas illite and trace amounts of interstratified illite-smectite are ubiquitous along the profile. Halloysite and kaolinite are the dominant clay minerals in highly to completely decomposed rocks. Halloysite clusters in moderately decomposed samples provide clear evidence of crystallization from solution, whereas vermiform kaolinite books reveal evidence of transformation from illite in most samples. In general, as the intensity of weathering increases: (a) kaolin-to-illite and kaolinite-to-halloysite ratios increase; and (b) the morphology of halloysite varies from spheriodal clusters to tubular aggregates. It is concluded that the nature, type and abundance of clay minerals along the profile result from complex combinations of several different processes controlled mainly by three factors: the pre-weathering alteration history of parent rock, the degree of weathering, and micro-environmental conditions. The relative role of each factor can vary significantly within the same profile. As evidenced by mineralogical and petrographical characteristics, the nature and type of clay minerals in fresh and moderately decomposed rocks can be attributed to pre-weathering hydrothermal and/or deuteric alterations. On the other hand, the degree of weathering regulates the nature, type and abundance of clay minerals, particularly kaolin group minerals, in highly to completely decomposed rocks. Sesquioxides are sensitive to microenvironmetal conditions and can modify the distribution of clay minerals regardless of the degree of weathering of the rock. © 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/catenaen_US
dc.relation.ispartofCatenaen_US
dc.rightsCatena. Copyright © Elsevier BV.-
dc.subjectClay Mineralsen_US
dc.subjectHong Kongen_US
dc.subjectPyroclastic Rocksen_US
dc.subjectWeatheringen_US
dc.titleDistribution of clay minerals along a weathered pyroclastic profile, 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/S0341-8162(02)00066-8en_US
dc.identifier.scopuseid_2-s2.0-0037164576en_US
dc.identifier.hkuros84303-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0037164576&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume50en_US
dc.identifier.issue1en_US
dc.identifier.spage17en_US
dc.identifier.epage41en_US
dc.identifier.isiWOS:000179335000002-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridDuzgorenAydin, NS=6602460166en_US
dc.identifier.scopusauthoridAydin, A=7102287997en_US
dc.identifier.scopusauthoridMalpas, J=7006136845en_US

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats