The quartz microstructures and microfabrics in tectonites representing greenschist to granulite facies conditions are examined to assess the factors influencing their development. The c-axis patterns range from random distributions to small, great, and crossed circle girdles, and to c-axes maxima. The small circle girdles, the most common fabrics at all metamorphic grades, are oriented at 30(DEGREES)-40(DEGREES) and 50(DEGREES)-70(DEGREES) about the axes of shortening and extension, respectively. / The c-axis orientations of the recrystallized grains bear no relationship to those of the host grains suggesting that host control, though important initially, is commonly overridden by strain controls. / The style and magnitude of strain, and the metamorphic grade are the significant controlling factors in the microfabric development. Intracrystalline slip mechanisms are favoured for the origin of the c-axis preferred orientations. Apparent discrepancies between experimental and natural fabrics can be reconciled when symmetries of strain are considered.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.68590 |
| Date | January 1980 |
| Creators | Tella, Subhas, 1945- |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Geology) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 000127580, proquestno: AAINK52145, Theses scanned by UMI/ProQuest. |
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