Coseismic temperature rise activates fault dynamic weakening that promotes earthquake rupture propagation. The spatial scales over which peak temperatures vary on slip surfaces are challenging to identify in the rock record. We present microstructural observations and electron backscatter diffraction data from three small-displacement hematite-coated mirrors (FMs) Wasatch zone, Utah, evaluate r...

The Palaeoproterozoic Great Slave Lake shear zone (GSLsz) is a crustal-scale strike-slip structure, with total length of >1,000 km and width ~25 km, that separates the Archean Rae cratons. range metamorphic rocks now exposed at surface encompasses granulite facies mylonite through to lower-greenschist ultramylonite cataclasite, providing potential type example fault-zone structure in middle low...

Astronauts Cernan and Schmitt, of Apollo 17, landed in the Taurus-Littrow valley of the Moon on December 11,1972. Their major objectives were (1) to sample very ancient lunar material such as might be found in pre-Imbrian highlands as distant as possible from the Imbrium basin and (2) to sample pyroclastic materials that had been interpreted as significantly younger than the mare basalts return...

[1] The absolute value of stress on a fault during slip is a critical unknown quantity in earthquake physics. One of the reasons for the uncertainty is a lack of geological constraints in real faults. Here we calculate the slip rate and stress on an ancient fault in a new way based on rocks preserved in an unusual exposure. The study area consists of a fault core on Kodiak Island that has a ser...

This paper reviews recent studies concerning the evolution of the pre-failure damage in several common lithologies, subjected to differential compression, by using detailed acoustic emission (AE) data. The experimental results exhibit a damaging process characterized by three typical phases of microcracking activity: the primary, secondary, and nucleation phases, respectively. The primary phase...

6 [1] The absolute value of stress on a fault during slip is a critical unknown quantity in 7 earthquake physics. One of the reasons for the uncertainty is a lack of geological 8 constraints in real faults. Here we calculate the slip rate and stress on an ancient fault 9 in a new way based on rocks preserved in an unusual exposure. The study area consists of 10 a fault core on Kodiak Island tha...

Abstract Exhumed fault rocks provide a textural and chemical record of how zone composition architecture control coseismic temperature rise earthquake mechanics. We integrated field, microstructural, hematite (U-Th)/He (He) thermochronometry analyses exhumed minor (square-centimeter-scale surface area) mirrors that crosscut the ca. 1400 Ma Sandia granite in two localities along eastern flank ce...

Summary Dynamic nonlinear elasticity in rocks may play an important role earth processes, such as earthquake nucleation. In order to understand how occurs within the shallow crust, experiments are required that simulate situ conditions of intact crustal rocks. Additionally, exploring behaviour response changes external parameters (e.g., temperature and wave frequency) acts a means further illum...

The spatial distribution of greenschist-facies retrograde reaction products in metabasic gneisses from Iona, western Scotland, has been investigated. may be broadly accounted for by a single reaction, but their different and temporal development indicates that series reactions occur with significantly scales metasomatic transfer. After initial fluid influx linked to deformation-induced high per...