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Linkage and evolution of conjugate strike-slip fault zones in limestones of Somerset and Northumbria

Linkage and evolution of conjugate strike-slip fault zones in limestones of Somerset and Northumbria
Linkage and evolution of conjugate strike-slip fault zones in limestones of Somerset and Northumbria
Conjugate strike-slip fault zones that cover metre-scale areas at Beadnell, Northumbria, and Kilve, Somerset, were initiated as conjugate vein arrays. Early conjugate faults are linked by the propagation of one fault that eventually by-passes the other fault. A model for the development of strike-slip faults is presented, using fault and vein geometries and the position of damage zones with respect to the master faults as an indication of the propagation direction. This model includes the evolution of networks from (1) the initial random development of vein arrays, to (2) the isolated development of several unconnected conjugate fault segments that pass into vein arrays, through (3) the intersection of a conjugate set of master faults and linkage with minor antithetic faults, and the formation of new vein arrays with extensional geometries after a linked network of faults is established, to (4) breaching of intersection points by dominant faults, and finally (5) the propagation towards oversteps that are breached to form a through-going fault. The geometry of the active structures simplifies with time, as strain is localised along the master fault, but the complexities are preserved in the fault walls.
1477-1493
Kelly, P.G.
f830caaa-9f4a-411c-bcc2-ef5296fec108
Sanderson, D.J.
4730a5b2-71f8-43b7-abdd-fc150331d539
Peacock, D.C.P.
54097ee9-4ba1-4691-836e-f72482e76160
Kelly, P.G.
f830caaa-9f4a-411c-bcc2-ef5296fec108
Sanderson, D.J.
4730a5b2-71f8-43b7-abdd-fc150331d539
Peacock, D.C.P.
54097ee9-4ba1-4691-836e-f72482e76160

Kelly, P.G., Sanderson, D.J. and Peacock, D.C.P. (1998) Linkage and evolution of conjugate strike-slip fault zones in limestones of Somerset and Northumbria. Journal of Structural Geology, 20 (11), 1477-1493. (doi:10.1016/S0191-8141(98)00048-0).

Record type: Article

Abstract

Conjugate strike-slip fault zones that cover metre-scale areas at Beadnell, Northumbria, and Kilve, Somerset, were initiated as conjugate vein arrays. Early conjugate faults are linked by the propagation of one fault that eventually by-passes the other fault. A model for the development of strike-slip faults is presented, using fault and vein geometries and the position of damage zones with respect to the master faults as an indication of the propagation direction. This model includes the evolution of networks from (1) the initial random development of vein arrays, to (2) the isolated development of several unconnected conjugate fault segments that pass into vein arrays, through (3) the intersection of a conjugate set of master faults and linkage with minor antithetic faults, and the formation of new vein arrays with extensional geometries after a linked network of faults is established, to (4) breaching of intersection points by dominant faults, and finally (5) the propagation towards oversteps that are breached to form a through-going fault. The geometry of the active structures simplifies with time, as strain is localised along the master fault, but the complexities are preserved in the fault walls.

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Published date: 1998

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Local EPrints ID: 16224
URI: http://eprints.soton.ac.uk/id/eprint/16224
PURE UUID: 04a202a4-a6e6-4244-99ea-377b8141b939

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Date deposited: 04 Jul 2005
Last modified: 15 Mar 2024 05:46

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Contributors

Author: P.G. Kelly
Author: D.J. Sanderson
Author: D.C.P. Peacock

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