Testing kinematic fault-slip models in the Eastern California Shear Zone–Walker Lane Belt: Field studies in southwestern Mina deflection, California–Nevada

Rachelle Warren
May 2013

Purpose and Introduction

The Mina deflection (Fig. 1A) is a ~125 km long structural step-over within the NW-striking dextral Eastern California Shear Zone (ECSZ)–Walker Lane Belt (WLB). Fault slip within this step-over is accommodated by a combination of sinistral, dextral, and normal faults (e.g. Faulds et al. 2008; Nagorsen-Rinke et al., 2013) and these faults transfer slip from the NW-striking dextral faults in the northern ECSZ to the NW-striking dextral faults in the central WLB. I will use geologic mapping, structural, kinematic, and geochronology studies in the River Spring area, southwestern Mina deflection (Fig. 1B) to document the kinematics of fault slip transfer across the area in order to test three kinematic models postulated to explain the mechanism of fault-slip transfer: normal fault–displacement-transfer model (Oldow et al. 1994), oblique-slip fault– transtensional model (Oldow et al. 2003), and sinistral fault–clockwise block rotation model (Wesnousky 2005).

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