On the Results of Studying Deep Paleo Seismic Dislocations (at the Example of the Marginal Suture of the Siberian Craton)
The results are discussed of using a complex geological-geophysical approach directed towards detecting and studying deep paleo seismic dislocations (PSD), i.e., ancient coseismic ruptures, at the example of investigations performed at exhumed segments of a marginal suture of the Siberian craton in the Western Baikal region. The obtained data testify that there is a possibility to reconstruct the P–T conditions and regimes of fluid activity in PSDs that had developed in powerful earthquakes in previous seismically and tectonically active eras at focal depths of about 10–25 km. The possibility of absolute dating over syn-metamorphic newly formed minerals, “geo-barometers”, using the Ar40/Ar39 method, have also been demonstrated. Studying deep P–T conditions of PSD emergence using the above approach has a key importance for the cognition of geological factors and petrophysical mechanisms that promote triggering coseismic displacements in faults during seismic source nucleation. The information obtained in studying deep PSDs is actual for developing geomechanical models of seismogenic faults and elaborating methods of their relaxation using preemptive complex anthropogenic actions on potentially dangerous segments of active faults.
KeywordsExhumed fault Paleo seismic dislocation (PSD) Fault mirror Pseudotachylite Coseismic slip
This work was supported by the Russian Foundation for Basic Research (Grant no. 17-05-01271).
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