Ductile deformation of the Whitestone Anorthosite by the Parry Sound Shear Zone: Implications for thrust tectonics
Başlık çevirisi mevcut değil.
- Tez No: 400620
- Danışmanlar: PROF. DR. JOHN STARKEY
- Tez Türü: Doktora
- Konular: Jeoloji Mühendisliği, Geological Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1989
- Dil: İngilizce
- Üniversite: Unıversıty Of Western Ontarıo
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
The Parry Sound Shear Zone occurs in the Grenville Province of the Canadian Pre-cambrian. Shield between the predominantly amphibolite facies gneisses of the Britt Domain and the granulite facies mafic rocks and migmatites of the Parry Sound Domain of the Central Gneiss Belt. The shear zone transects the Whitestone Anorthosite, located along the western margin of the Parry Sound Domain, and produces a range of new textures and paragenesis. Two types of mylonites occur along the intersection between the Whitestone Anorthosite and the Parry Sound Shear Zone. Away from the mylonites, moderately modified anorthosite, exhibit!ng well-defined schistosity, and weakly modified anorthosite, exhibiting relict igneous textures and ill-defined foliation, . occur. Minor planar and anastomosing shear zones are superimposed on modified anorthosites. The metamorphic mineral assemblages produced in the Whitestone Anorthosite formed under retrogressive conditions. Moderately modified anorthosite, scapolite-bearing planar shear zones and scapolite-beari ng myloni tes display a mineral assemblage of plagioclase (An-34-60) , pargasite, scapolite (Me68-75) , and almandine garnet which suggests middle-upper amphibolite facies conditions of metamorphism. The anorthositesdisplay small chemi cal modifications compared to the undeformed Whitestone Anorthosite; CO- is the most prominently enhanced component. Weakly modified anorthosite, quartz-bearing anastomosing shear zones and quartz-bearing mylonites consist of plagioclase (An 20-4.7), hornblende/pargasite, scapolite (Me 57-65) and epidote or almandine garnet which suggest middle-lower amphibolite facies. The anorthosites display significant chemical modifications compared to the undeformed anorthosite; SiO? and K?0 are the most dramatically increased components. Under amphibolite and higher metamorphic conditions, plagioclase in the increasingly modified anorthosites underwent syntectonic recrystallizatiOn which produced non-random crystallographic orientation patterns. Quartz, present in ribbons in quartz-rich mylonites and anastomosing shear zones, deformed by dislocation creep resulting in the development of two different preferred crystallographic orientations. Isolated quartz and recrystallized plagioclase in the matrix deformed by grain boundary processes which produced random crystal orientati ons. The textural and mineralogical characteristics of the Whitestone Anorthosite in the . Parry Sound Shear Zone suggest a history of deformation that extended from granulite facies to lower amphibolite facies conditions. The observed sequence of chemical modifications suggests an evolutionary fluid history resulting from the inverted metamorphic gradient of an overthrust. The different orientation patterns observed in quartz grains within quartz ribbons suggest the occurrence of different regimes during the latest stages of deformation. The reported zircon U-Pb ages of syn-, and late-tectonic pegmatites indicates this progressive deformation occurred from about 1160 Ma to at least 1120.
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