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dc.rights.licenseRestricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.
dc.contributorMiller, Donald S.
dc.contributor.authorAnderson, George A., III.
dc.date.accessioned2021-11-03T08:42:13Z
dc.date.available2021-11-03T08:42:13Z
dc.date.created2016-11-01T11:26:32Z
dc.date.issued1972-06
dc.identifier.urihttps://hdl.handle.net/20.500.13015/1815
dc.descriptionJune 1972
dc.descriptionSchool of Science
dc.description.abstractThe coronas have resulted from a reaction between olivine and plagioclase. They consist of an olivine core concentrically surrounded by an intergrowth of orthopyroxene and clinopyroxene, a moat of clear plagioclase, a rim of garnet, then the primary plagioclase. Recent experimental evidence indicates the coronas are formed by a two-stage viii reaction. A) Olivine + Plagioclase Orthopyroxene + AI-rich Clinopyroxene + Spinel B) AI-rich Orthopyroxene + AI-rich Clinopyroxene + Spinel + Plagioclase ~ Pyrope-Almandine-Grossular / Garnet. Garnet is forming at the expense of plagioclase, and pyroxene is forming at the expense of olivine. This implies the transformation of one type of silicate structure into a different type of silicate structure. To enable such a situation to occur, minute amounts of intergranular water vapor probably aid in the breaking of chemical bonds, allowing structural rearrangement and ion migration along concentration gradients to complete the new mineral structures.
dc.description.abstractThe occurrence of garnet in coronas, rather than disseminated as porphyroblasts throughout the rock, and the relict ophitic texture indicate that ,there was no intense granulation or recrystallization, negligible shear stress and no introduction of large amounts of water or watery fluids from the surrounding country rocks.
dc.language.isoENG
dc.publisherRensselaer Polytechnic Institute, Troy, NY
dc.relation.ispartofRensselaer Theses and Dissertations Online Collection
dc.subjectGeology
dc.titleAn investigation of the possibility of cryptic layering and the implications of garnet coronas in the Jay Mountain layered metagabbro
dc.typeElectronic thesis
dc.typeThesis
dc.digitool.pid177710
dc.digitool.pid177711
dc.digitool.pid177713
dc.digitool.pid177712
dc.digitool.pid177714
dc.rights.holderThis electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
dc.description.degreeMS
dc.relation.departmentDept. of Geology


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