Controls of Metamorphism: A SymposiumWallace S. Pitcher, Glenys W. Flinn |
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Page 203
... MIGMATITES HILMAR VON PLATEN 1. INTRODUCTION In regions with high - grade metamorphism , we often find rocks which , according to Sederholm ( 1926 ) , “ look like mixed rocks ... and they originated by the mixture of older rocks and a ...
... MIGMATITES HILMAR VON PLATEN 1. INTRODUCTION In regions with high - grade metamorphism , we often find rocks which , according to Sederholm ( 1926 ) , “ look like mixed rocks ... and they originated by the mixture of older rocks and a ...
Page 204
... migmatites must be formed mainly by potassium metasomatism . On the basis of our experiments which dealt with the experimental crystalliza- tion and anatexis of natural melts and rocks , we can discuss the arguments which have been put ...
... migmatites must be formed mainly by potassium metasomatism . On the basis of our experiments which dealt with the experimental crystalliza- tion and anatexis of natural melts and rocks , we can discuss the arguments which have been put ...
Page 229
... migmatitic . Nearer the granite migmatites appear as augen and injection gneisses in which potash increases for the first time , and the composition of the rock gradually approaches that of granite . Similar phenomena have been ...
... migmatitic . Nearer the granite migmatites appear as augen and injection gneisses in which potash increases for the first time , and the composition of the rock gradually approaches that of granite . Similar phenomena have been ...
Contents
INTRODUCTION | 11 |
SOME RECENT ADVANCES IN OUR UNDERSTANDING OF | 22 |
DEFORMATION IN METAMORPHISM | 46 |
Copyright | |
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activation energy albite alkali aluminium amphiboles amphibolites analyses anatexis andalusite anthophyllite assemblages atoms biotite cent chemical chlorite coexisting complex cordierite crystallization curve Dalradian deformation ellipsoid diagram diffusion dislocations Engel equilibrium evidence example experimental facies field formation Fyfe garnet geol geological gneisses grain boundaries granitic growth hornblende host rock host-rock composition igneous rocks increase index minerals indicate intrusion iron isograd isotope K-Ar kyanite lattice magnesium magnetite mechanism melting meta metamorphic belts metamorphic reactions metamorphic rocks metamorphosed metastable mica migmatites migration Miyashiro MnO content muscovite nucleation occur overpressures oxide oxygen pattern pelitic pelitic rocks Petrology phase plagioclase plot polymorphs porphyroblasts potassium feldspar preferred orientation pressure pyroxene quartz radiogenic Rast ratio Rb-Sr recrystallization regional metamorphism relations relationship schists silicate sillimanite stability staurolite strain stress structure suggests tectonic temperature textural thermal titanium translation gliding twinning variation Verhoogen Yoder zone