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Article: Microscopic-photometric measurement of polymodal clay orientation using circular-polarized light and interference colours

TitleMicroscopic-photometric measurement of polymodal clay orientation using circular-polarized light and interference colours
Authors
Issue Date1988
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/clay
Citation
Applied Clay Science, 1988, v. 3 n. 4, p. 307-321 How to Cite?
AbstractOrientation measurements are important in many branches of geosciences in both field and laboratory studies. For fine-grained especially clayey samples, particulate and other physical methods are unsuitable. This is because numerous individual measurements are needed for a desirable level of accuracy, and sophisticated sample preparations and equipment are required. Existing photometric techniques were evaluated. They fail to deliver circular vectorial data (both magnitude and direction) for preferred orientation, and cannot detect bimodal or polymodal patterns. A modified method is developed to overcome these pitfalls. The pertinent principles related to clay orientation in thin sections, relative retardation and interferece colours are reviewed. Spectral distributions of interference colours are calculated and plotted to facilitate the selection of a suitable wavelength to winnow the light. A sensitive-tint plate of gypsum is used to alter the relative retardation and hence the interference colours of oriented clay in thin sections. The interference colours of unlike vibration direction are separated from those of alike vibration and isotopic components (including voids) by a monochromatic filter at a chosen wavelength, and detected by a photoelectric sensor (selenium photocell). Circular-polarized light was employed to eliminate the extinction phenomenon which was regarded as unwanted noise. Details on calibration, equipment setup and procedures are given. The application of circular statistics to the orientation data is described and illustrated with results of selected specimens. © 1988.
Persistent Identifierhttp://hdl.handle.net/10722/157762
ISSN
2015 Impact Factor: 2.586
2015 SCImago Journal Rankings: 0.826

 

DC FieldValueLanguage
dc.contributor.authorJim, CYen_US
dc.date.accessioned2012-08-08T08:55:36Z-
dc.date.available2012-08-08T08:55:36Z-
dc.date.issued1988en_US
dc.identifier.citationApplied Clay Science, 1988, v. 3 n. 4, p. 307-321en_US
dc.identifier.issn0169-1317en_US
dc.identifier.urihttp://hdl.handle.net/10722/157762-
dc.description.abstractOrientation measurements are important in many branches of geosciences in both field and laboratory studies. For fine-grained especially clayey samples, particulate and other physical methods are unsuitable. This is because numerous individual measurements are needed for a desirable level of accuracy, and sophisticated sample preparations and equipment are required. Existing photometric techniques were evaluated. They fail to deliver circular vectorial data (both magnitude and direction) for preferred orientation, and cannot detect bimodal or polymodal patterns. A modified method is developed to overcome these pitfalls. The pertinent principles related to clay orientation in thin sections, relative retardation and interferece colours are reviewed. Spectral distributions of interference colours are calculated and plotted to facilitate the selection of a suitable wavelength to winnow the light. A sensitive-tint plate of gypsum is used to alter the relative retardation and hence the interference colours of oriented clay in thin sections. The interference colours of unlike vibration direction are separated from those of alike vibration and isotopic components (including voids) by a monochromatic filter at a chosen wavelength, and detected by a photoelectric sensor (selenium photocell). Circular-polarized light was employed to eliminate the extinction phenomenon which was regarded as unwanted noise. Details on calibration, equipment setup and procedures are given. The application of circular statistics to the orientation data is described and illustrated with results of selected specimens. © 1988.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/clayen_US
dc.relation.ispartofApplied Clay Scienceen_US
dc.titleMicroscopic-photometric measurement of polymodal clay orientation using circular-polarized light and interference coloursen_US
dc.typeArticleen_US
dc.identifier.emailJim, CY:hragjcy@hkucc.hku.hken_US
dc.identifier.authorityJim, CY=rp00549en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0024163804en_US
dc.identifier.volume3en_US
dc.identifier.issue4en_US
dc.identifier.spage307en_US
dc.identifier.epage321en_US
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridJim, CY=7006143750en_US

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