Optical and X-ray study of the low plagioclases

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dc.contributor.authorWolfe, Hugh Edwarden
dc.contributor.departmentGeological Sciencesen
dc.date.accessioned2014-03-14T21:38:18Zen
dc.date.adate2010-06-12en
dc.date.available2014-03-14T21:38:18Zen
dc.date.issued1976en
dc.date.rdate2010-06-12en
dc.date.sdate2010-06-12en
dc.description.abstractFor each of 24 grains of low plagioclase with ‘Inferred An' contents 4.1, 6.8, 16.6, 27.7, 30.2, 35.8, 36.6, 37.6, 38.7, 43.1, 44.2, 48.0, 50.8, 51.9, 55.0, 56.5, 56.6, 57.9, 61.8, 62.1, 64.5, 76.8, 78.2, and 90.4 the following properties were measured: (1) y*, (2) location of the crystallographic axes, (3) separation of the non-Bragg e-diffractions from precession photographs, (4) refractive indices α, β, and γ, (5) the location of the optic axes, (6) the location of the principal vibration directions X, Y, and Z, (7) and a value of 2V. Plots of y* versus the product, αβγ, which correlates linearly to anorthite content, confirm the presence of two structural discontinuities in the low plagioclase series. The angular attitude of the two optic axes and of the principal vibration directions plotted stereographically relative to b* (at S = 0, E= 0) andc (at S = 90, E = 90) for each grain follow the classic migration curves of Reinhart (1931) with slight revision. The orientation of the principal vibration axes X, Y, and Z is related quantitatively to crystallographic directions b*, c, and A by means of Euler angles Φ, θ, and ψ introduced by Burri et al. (1967) and to the crystallographic axes a, b*, and C by a set of new Euler angles θ₁, θ₂, and θ₃.en
dc.description.degreeMaster of Scienceen
dc.format.extent84 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06122010-020139en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06122010-020139/en
dc.identifier.urihttp://hdl.handle.net/10919/43228en
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1976.W64.pdfen
dc.relation.isformatofOCLC# 09159284en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1976.W64en
dc.subject.lcshPlagioclase -- Optical propertiesen
dc.titleOptical and X-ray study of the low plagioclasesen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineGeological Sciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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