Creep cavitation bands control porosity and fluid flow in lower crustal shear zones

Luca Menegon, Florian Fusseis, Holger Stünitz, Xianghui Xiao

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Shear zones channelize fluid flow in Earth's crust. However, little is known about deep crustal fluid migration and how fluids are channelized and distributed in a deforming lower crustal shear zone. This study investigates the deformation mechanisms, fluid-rock interaction, and development of porosity in a monzonite ultramylonite from Lofoten, northern Norway. The rock was deformed and transformed into an ultramylonite under lower crustal conditions (temperature = 700-730 °C, pressure = 0.65-0.8 GPa). The ultramylonite consists of feldspathic layers and domains of amphibole + quartz + calcite, which result from hydration reactions of magmatic clinopyroxene. The average grain size in both domains is

Original languageEnglish
Pages (from-to)227-230
Number of pages4
JournalGeology
Volume43
Issue number3
DOIs
Publication statusPublished - 2 Feb 2015

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