Cyclic Brittle?Ductile Oscillations Recorded in Exhumed High?Pressure Continental Units: A Record of Deep Episodic Tremor and Slow Slip Events in the Northern Apennines
نویسندگان
چکیده
The geological record of deep fossil seismogenesis in subduction zones is limited due to common rock overprinting during exhumation and only a few regions expose well-preserved deeply exhumed structures. We investigated mesoscopic contractional duplex formed at blueschist facies conditions continental metasediments the Northern Apennines (Italy). Field observations reveal strain partitioning within between metapelite bands, corresponding high-strain zones, metaquartzarenite which form low-strain, imbricated metric horses. Dilational shear veins occur both lithotypes are composed quartz carpholite fibers defining stretching lineation parallel regional SW-NE transport direction. Geometrical, cross cutting petrographic relationships suggest that broadly syn-mylonitization. Thermodynamic modeling constrains formation mylonitic foliation >0.7 GPa ?400°C dilational vein ?1.1 350°C. Therefore, we document top-to-the-E-NE thrust deepest recorded by this unit Apennines. In thrusted metasediments, aqueous fluid locally released metamorphic dehydration reactions transiently increased pore pressure, turn triggering brittle-ductile cyclicity. propose represent episodic tremor slow slip events. To best our knowledge, first time these events genetically associated with brittle ductile structures duplex. could be features high-pressure units Apennine orogenic belt.
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ژورنال
عنوان ژورنال: Geochemistry Geophysics Geosystems
سال: 2021
ISSN: ['1525-2027']
DOI: https://doi.org/10.1029/2021gc009805