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Rock magnetic measurements were conducted on fault rocks from the Zhaojiagou outcrop at Leigu Town, Beichuan County, Sichuan Province (China), located on the Yingxiu–Beichuan Fault, the main fault ruptured in the 2008 Wenchuan Ms 8.0 earthquake. Hysteresis measurements indicate that fault rocks contain very low concentrations of ferrimagnetic minerals, and their magnetic behavior is dominated by para-/diamagnetic...
The timing of faulting episodes can be constrained by radiometric dating of fault-zone rocks. Fault-zone material suitable for dating is produced by tectonic processes, such as (1) fragmentation of host rocks, followed by grain-size reduction and recrystallization to form mica and clay minerals, (2) secondary heating/melting of host rocks by frictional fault motions, and (3) mineral vein formation...
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