Reactivation of Magma Pathways: Insights From Field Observations, Geochronology, Geomechanical Tests, and Numerical Models
Samuel T Thiele, Alexander R Cruden, Xi Zhang, Steven Micklethwaite, Erin L Matchan
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH | AMER GEOPHYSICAL UNION | Published : 2021
Field observations and unmanned aerial vehicle surveys from Caldera Taburiente (La Palma, Canary Islands, Spain) show that pre-existing dykes can capture and re-direct younger ones to form multiple dyke composites. Chill margins suggest that the older dykes were solidified and cooled when this occurred. In one multiple dyke example, an 40Ar/39Ar age difference of 200 kyr was determined between co-located dykes. Petrography and geomechanical measurements (ultrasonic pulse and Brazilian disc tests) show that a microscopic preferred alignment of plagioclase laths and sheet-like structures formed by non-randomly distributed vesicles give the solidified dykes anisotropic elastic moduli and fractu..View full abstract
Awarded by Australian Research Council Discovery Grant
The authors gratefully acknowledge the staff at Parque Nacional Caldera de Taburiente for their generous support and hospitality during collection of the field data presented in this study. ST was supported by a Westpac Future Leaders Scholarship and Australian Postgraduate Award. ARC's research on magma plumbing systems is supported by Australian Research Council Discovery Grant DP190102422. The University of Melbourne Ar-Ar Laboratory receives support under the AuScope program of the National Collaborative Research Infrastructure Strategy (NCRIS). Finally, we would like to thank John Browning, Dave Healy, Hans JOrgen KjOll and an anonymous reviewer for their constructive and helpful comments. Open Access funding enabled and organized by Projekt DEAL.