{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/43228"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/43228","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"Optical and X-ray study of the low plagioclases","abstract":"For 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.","abstract_html":"For 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.","abstract_has_math":false,"creators":["Wolfe, Hugh Edward"],"institution":"Virginia Tech","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Geological Sciences","degree_department":"Geological Sciences","school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1976,"date_issued":"1976","date_published":"1976","updated_at":"2026-07-22T22:19:56Z","subjects":[],"languages":[],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-06122010-020139"],"render_values":[{"text":"etd-06122010-020139","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/10919/43228","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.department","label":"Department","values":["Geological Sciences"]},{"key":"dc:creator","label":"Author","values":["Wolfe, Hugh Edward"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2014-03-14T21:38:18Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2014-03-14T21:38:18Z","2010-06-12"]},{"key":"dc:date.issued","label":"Date","values":["1976"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Tech"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.dcmitype","label":"Dc Type Dcmitype","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Geological Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute and State University"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-06122010-020139"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/43228"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["For 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."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Master of Science"]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["BTD"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Optical and X-ray study of the low plagioclases"]}]}],"canonical_facts":{"dc:contributor.department":["Geological Sciences"],"dc:creator":["Wolfe, Hugh Edward"],"dc:date.accessioned":["2014-03-14T21:38:18Z"],"dc:date.available":["2014-03-14T21:38:18Z","2010-06-12"],"dc:date.issued":["1976"],"dc:description.abstract":["For 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."],"dc:description.degree":["Master of Science"],"dc:format.medium":["BTD"],"dc:format.mimetype":["application/pdf"],"dc:identifier.other":["etd-06122010-020139"],"dc:identifier.uri":["http://hdl.handle.net/10919/43228"],"dc:publisher":["Virginia Tech"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:title":["Optical and X-ray study of the low plagioclases"],"dc:type":["Thesis"],"dc:type.dcmitype":["Text"],"thesis:degree_discipline":["Geological Sciences"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Virginia Polytechnic Institute and State University"]},"updated_at":"2026-07-22T22:19:56Z"}