Calculation of dike trajectories from volcanic centers

Catherine Mériuax, John R. Lister

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49 Citations (Scopus)

Abstract

Patterns of dike swarms around volcanic centers or above mantle plumes are interpreted by a mechanical analysis of regional and dike-induced stresses, in which dike emplacement is controlled and guided by the stress state. Comparisons of dike patterns with patterns of principal-stress trajectories caused by a source and a regional stress system are commonly used to infer paleostresses. However, dike trajectories are determined by a complex interaction between dike-induced stresses and the source/regional stress system. We present numerical calculations based on a novel boundary-integral formulation, which examines the simultaneous effects of regional stresses, magma pressure, and dike injection on the local stress state around a continously curving dike. Dike paths are calculated from the condition that dikes propagate by model I failure. Our results suggest that the magnitude of the regional stresses would be 2-5 times higher than previous estimates based on principal-stress trajectory analysis.

Original languageEnglish
JournalJournal of Geophysical Research: Solid Earth
Volume107
Issue number4
Publication statusPublished - 10 Apr 2002

Keywords

  • Dike path
  • Dike swarm
  • Principal-stress trajectory
  • Propagation
  • Regional stress

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