METAMORPHIC ROCKS (1)

Metamorphic rocks in thin section

... polarized light, 40x NNH-3 Actinolite in a greenstone Like most monoclinic amphiboles actinolite has birefringence in the lower 2nd order Twinning, possibly relic from the original augite, can be seen ... Cummingtonite in a hornblende - biotite - cummingtonite amphibolite Like most monoclinic amphiboles, birefringence is in the lower second order Cross polarized light, 100x Q-603C Cummingtonite in ... pleochroic chlorite This grain has prominent twinning, evident in parallel stripes having somewhat different pleochroic colors Plane polarized light, 20x IMA96-C1-1 Chloritoid in a muscovite-chlorite...

Metamorphism and Metamorphic Rocks

... (blueschist and eclogite metamorphism) Regional metamorphism Zone where wet fractional melting starts Contact metamorphism Figure 8.18 BE ABLE TO SKETCH THIS, AND EXPLAIN Plate Tectonics And Metamorphism ... under the coast of Alaska and the Aleutian Islands Figure 8.18 1-burial metamorphism; 2-high p, low T metamorphism Plate Tectonics And Metamorphism (3)  Regional metamorphism: where continental ... burial metamorphism As temperatures and pressures increase, burial metamorphism grades into regional metamorphism Regional Metamorphism A Consequence of Plate Tectonics    Regional metamorphism...

Báo cáo " Ar‐Ar age of metamorphic and mylonitic rocks in northern part of the Kon Tum massif: evidence for the Indosinian movement along shear zones between Kon Tum massif and Truong Son belt " doc

... deformation and results of Ar‐Ar dating in this area in order to constrain in detail the spatial metamorphic evolution and interpretation of geodynamic setting of the Indochina. ... inside this zone, so this W‐E metamorphic shear zone could be representative for the main tectonic boundary between Kon Tum metamorphic massif and non metamorphic Truong Son belt during Indosinian movement. ... Thi, and Nguyen Van Vuong, The Early Triassic Indosinian orogeny in Vietnam (Truong Son belt and Kon Tum massif) : implications for the geodynamic evolution of Indochina, Tectonophysics 393 (2004) 87. ...

Metamorphic facies and metamorphosed mafic rocks

... the mantle Metamorphic Facies 2) Facies of medium pressure • Most exposed metamorphic rocks belong to the greenschist, amphibolite, or granulite facies • The greenschist and amphibolite facies conform ... garnet), characterizing this facies Sanidinite facies is not evident in basic rocks Mafic Assemblages of the High P/T Series: Blueschist and Eclogite Facies Mafic rocks (not pelites) develop definitive ... that characterize each facies (for mafic rocks) Table 25-1 Definitive Mineral Assemblages of Metamorphic Facies Facies Definitive Mineral Assemblage in Mafic Rocks Zeolite zeolites: especially...