Abstract
According to geological maps, the exposed continental crust contains abundant anhydrous granulite facies and igneous rocks. Exposed crustal sections (Fountain and Salisbury, 1981) suggest that such rocks are even more abundant in the deep continental crust. During continental collisions, anhydrous granulite facies and igneous rocks can be explaced into deep crustal root zones and become subjected to P—T conditions where their original mineral assemblage is not stable. Numerous field and petrological investigations have shown that anhydrous rocks can survive even eclogite facies conditions with their original mineralogy and structure intact (Wayte et al., 1989; Rubie, 1990). Experimental work and field examples suggest that overstepping of reaction boundaries by at least 5 kbar at temperatures as high as 700°C is possible without re-equilibrium.
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Austrheim, H., Engvik, A.K. (1997). Fluid Transport, Deformation and Metamorphism at Depth in a Collision Zone. In: Jamtveit, B., Yardley, B.W.D. (eds) Fluid Flow and Transport in Rocks. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1533-6_7
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DOI: https://doi.org/10.1007/978-94-009-1533-6_7
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