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This book covers a wide range of processes which govern the properties and evolution of the deep continental crust. The response of rocks to conditions of deep crustal metamorphism and the onset of melting is a fundamental part of large-scale geological history which researchers have only recently begun to understand in any detail. This book aims not only to document recent research on this important area of geology but also to explain current methods of investigation and the interpretation of results. The main aspects of petrology of high-grade, regional metamorphic rocks are covered as well as melting and fluid transport within the Earth's crust. Chapters on theoretical framework and relevant experiments are complemented by others on key regions illustrating high-grade metamorphism. These include Sri Lanka and central Australia, which are now being studied intensively for the first time, and the classic ground of the Adirondack Mountains in New York and the Lewisian of Scotland. The study of these areas is based largely on petrological lines but tectonic settings are also considered. As a guide to recent developments, the book is considered essential reading for research workers and students of geology and should provide an invaluable reference work for lecturers and a useful introduction for non-specialist geologists.
Contents
An overview of diverse responses to diverse processes at high crustal temperatures, J.R.Ashworth and M.Brown; graphical analysis of P-T-Z relations in granulite facies metapelites, B.J.Hensen and S.L.Harley; a model for rates of disequilibrium melting during metamorphism, D.C.Rubie and A.J. Brearley; formation and composition of H2O-undersaturated granitic melts, W.Johannes and F.Holtz; garnet porphyroblast-bearing leucosomes in metapelites - mechanisms, phase diagrams and an example from Broken Hill, Australia, R.Powell and J.Downes; isotopic modification of the continental crust - implications for the use of isotope tracers in granite petrogenesis, S.M.Wickham; fluids and melting in the Archaean deep crust of southern India (Hallimond Lecture of the Mineralogical Society), R.C.Newton; fluid-rock interaction in the north-west Adirondack Mountains, New York, I.Cartwright and J.W.Valley; progressive metamorphism and melting in the Acadian metamorphic high of central Massachusetts and southwestern New Hampshire, USA, J.C.Schumacher et al; granulite facies metamorphism of metabasic and intermediate rocks in the Highland Series of Sri Lanka, R.Schumacher et al; local, mid-crustal granulite facies metamorphism and melting - an example in the Mount Stafford area, central Australia, R.H.Vernon et al; Archaean and Proterozoic high-grade terranes of East Antarctica - a case study of diversity in granulite facies metamorphism, S.L.Harley and B.J.Hensen - the Napier Complex, the Vestfold Hills block, the Lutzow-Holm Bay Complex, the Rayner Complex; prograde metamorphism, anatexis and retrogression of the Scourian Complex, north-west Scotland, I.Cartwright.
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