Fig. 1 Seismic faulting in the lower crust.

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Petrology and metamorphism of amphibolites

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Presentation transcript:

Fig. 1 Seismic faulting in the lower crust. Seismic faulting in the lower crust. (A) A fault through lower crustal granulite (arrows) produced a millimeter-thick frictional melt zone that froze to form a pseudotachylite vein with a hydrous eclogite facies mineralogy comprising dendritic garnet, kyanite, clinopyroxene (omphacite and sodic augite), and amphibole. (B) Photomicrograph showing the positions of the garnets studied here [Garnet I (Grt I) and II (Grt II)], with respect to a ca. 1-mm-thick pseudotachylite crosscutting the plagioclase (Plg)–rich granulite. Garnet I is part of a larger garnet that was cut off by the fault. The granulite facies assemblage also includes clinopyroxene (Cpx), amphibole (Amp), and spinel (Sp). Photo credit: Håkon Austrheim, University of Oslo. Håkon Austrheim et al. Sci Adv 2017;3:e1602067 Copyright © 2017, The Authors