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Russian Geology and Geophysics

2004 year, number 4

FAULT PATTERN IN CONTINENTAL ZONES OF LITHOSPHERIC EXTENSION

K.Zh. Seminsky
Institute of the Earth's Crust, Siberian Branch of the RAS, 128 ul. Lermontova, Irkutsk, 664033, Russia
Keywords: Faults, faulting pattern, Baikal rift, zones of extension
Pages: 411-420

Abstract

A typical pattern common to second-order faults in extended lithosphere was revealed based on field geological and structural data from the Obruchev fault in the Baikal rift and published evidence of rift-related faulting worldwide. The typical fault family is dominated by rift-parallel synthetic and antithetic normal faults and includes transverse faults of normal and strike-slip geometry, strike-slip faults oblique to the rift strike, and rift-parallel reverse faults and thrusts. The coexistence of faults of various types within first-order extension zones is accounted for by accommodation of shear strain and by the kinematics of large basin-parallel normal faults. The suggested typical pattern can be used for reference in interpretation of faulting histories in rifted continental lithosphere.