Control of strike-slip fault on dyke emplacement and morphology

GALLAND, OLIVIER; SPACAPAN, JUAN B.; SVERRE PLANKE; LEANZA, HÉCTOR A.

JOURNAL OF THE GEOLOGICAL SOCIETY

GEOLOGICAL SOC PUBL HOUSE

Lugar: Londres; Año: 2016

0016-7649

Strike-slip faults are commonly assumed to influence magma transport andemplacement in the Earth´s crust. However, direct observations of magma conduitswithin strike-slip faults are lacking. Here we provide some of the first detailed fieldobservations of dykes emplaced within strike-slip faults in the Neuquén Basin,Argentina. We show how fault planes within strike-sip fault zones affect theemplacement of dyke offshoots, resulting in complex dyke morphology. Our study alsoemphasizes the importance of pre-existing strike-slip fault array on the development ofdyke swarms, showing that orientations of dyke swarms may not systematically relateto the principal tectonic stress axes