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Date : 2006-04-03
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Evolution and Differentiation of the Continental Crust ~ Arcs are traditionally viewed as sites of crustal growth and in many models of crustal evolution the subduction factory is regarded as the principal site of production of continental crust Even in modern arcs though it is challenging to quantify the mass of material being transferred from mantle to crust
PDF Evolution and Differentiation of the Continental Crust ~ Partial melting and melt extraction in crustal rocks are first order processes for the differentiation of continental crust Brown and Rushmer 2006 Metapelites metagreywackes and granites start to melt at temperatures of about 650 °C Sawyer et al 2011 producing melts of granitic composition
Evolution of the continental crust Nature ~ Differentiation of the continental crust is dominated by igneous processes The degree of differentiation constrains how the rates at which the upper crust is generated relate to those at which new crust is generated and the amounts of residual crustal material recycled back into the mantle
EVOLUTION AND DIFFERENTIATION OF THE CONTINENTAL CRUST ~ and the longterm evolution of the continents 67 4 Composition differentiation and evolution of continental crust constraints from sedimentary rocks and heat flow 92 5 The significance of Phanerozoic arc magmatism in generating continental crust 135 6 Crustal generation in the Archean 173
Evolution and Differentiation of the Continental Crust ~ The evolution and differentiation of the continental crust pose fundamental questions that are being addressed by new research concerning melting melt extraction and transport through the crust and the effect of melt on crustal rheology
Evolution of the continental crust ~ Evolution of the continental crust 1 INTRODUCTION • The continental crust covers nearly a third of the Earth’s surface extends vertically from the Earth’s surface to the Moho discontinuity
The generation and evolution of the continental crust ~ The generation and evolution of the continental crust Abstract The continental crust is the archive of the geological history of the Earth Only 7 of the crust is older than 25 Ga and yet significantly more crust was generated before 25 Ga than subsequently
PDF The generation and evolution of the continental crust ~ The continental crust is the archive of the geological history of the Earth Only 7 of the crust is older than 25 Ga and yet significantly more crust was generated before 25 Ga than subsequently Zircons offer robust records of the magmatic and crustforming events preserved in the continental crust
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