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Full-Text Articles in Physical Sciences and Mathematics
The Development Of Foliations In Low, Medium And High Grade Metamorphic Tectonites, William J. Gregg
The Development Of Foliations In Low, Medium And High Grade Metamorphic Tectonites, William J. Gregg
Geology Theses and Dissertations
Studies of foliation and associated microstructures are presented from a variety of rock types and localities in the metamorphic terrains of the northeastern United States.
At Islesboro, Maine cleavage is well developed in lower greenschist grade siltstones and interbedded pelites of lower Paleozoic age. Cleavage in the siltstone units consists of two types of discrete mica films: short film segments and lengthened mica film. Thick secondary mica-rich layers are also exhibited in some siltstones. The short film segments appear to be basic elements through which cleavage development progresses by a linkage process that is poorly understood. The linkage of these …
Structural Studies In The Northern Chester Dome Of East-Central Vermont, Bruce Wallace Nesbit
Structural Studies In The Northern Chester Dome Of East-Central Vermont, Bruce Wallace Nesbit
Geology Theses and Dissertations
Rocks in the Eastern Vermont Sequence are highly metamorphosed and are said to range in age from Precambrian to Siluro-Devonian. The sequence outcrops on Keyes Mountain, about 6km Northwest of Felchville, Vermont, and an area on this mountain about 2km square was mapped in great detail.
The dominant rock type found is quartzofeldspathic gneiss, but schistose gneiss, amphibolite, quartzite and schist also occur. Most of these rocks are layered but layering has been transposed in many places and much of it is probably secondary. Layering and schistosity both dip dominantly to the north at about 25º.
A number of mesoscopic …