Role of tectonic stress and topography on repeated lateral dikes: application to the 1975-1984 Krafla and 2023-2025 Svartsengi rifting episodes in Iceland.

ABSTRACT: Lateral dike intrusions into rift zones, repeated in temporal sequences, depend on intrinsic and extrinsic factors including pressure build-up where magma accumulates between intrusions, and the local stress regime influenced by tectonic stress and topography. We reexamine these effects by revising a simplified elastic model of rifting by Buck et al. (2006), where topographic gradients and tectonic stress, in addition to magma accumulation, contribute to the driving pressure of dike propagation. Our model (i) introduces a three-section dike geometry, (ii) assumes lateral dike intrusions follow a positive pressure gradient and open in the part of the rift zone where the local maximum of driving pressure occurs, (iii) restricts the amount of dike opening according to tectonic stress stored p

SUBMITTER: Yang Y 

PROVIDER: S-EPMC12586415 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature