Abstract:
:Large earthquakes occur in rocks undergoing high-pressure/low-temperature metamorphism during subduction. Rhythmic major-element zoning in garnet is a common product of such metamorphism, and one that must record a fundamental subduction process. We argue that rhythmic major-element zoning in subduction zone garnets from the Franciscan Complex, California, developed in response to growth-dissolution cycles driven by pressure pulses. Using electron probe microanalysis and novel techniques in Raman and synchrotron Fourier transform infrared microspectroscopy, we demonstrate that at least four such pressure pulses, of magnitude 100-350 MPa, occurred over less than 300,000 years. These pressure magnitude and time scale constraints are most consistent with the garnet zoning having resulted from periodic overpressure development-dissipation cycles, related to pore-fluid pressure fluctuations linked to earthquake cycles. This study demonstrates that some metamorphic reactions can track individual earthquake cycles and thereby opens new avenues to the study of seismicity.
journal_name
Sci Advjournal_title
Science advancesauthors
Viete DR,Hacker BR,Allen MB,Seward GGE,Tobin MJ,Kelley CS,Cinque G,Duckworth ARdoi
10.1126/sciadv.aaq0234subject
Has Abstractpub_date
2018-03-21 00:00:00pages
eaaq0234issue
3issn
2375-2548pii
aaq0234journal_volume
4pub_type
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