Details
  • Hongliang Wang, Durham University, UK
  • Date: September, 10, 2014 12:00 am
  • Place: Sala d'Actes del Institut de Ciències de la Terra Jaume Almera(ICTJA)
  • Location: C/ Solé i Sabarís s/n, Barcelona
Abstract

The strength and buoyancy contrast between cratonic and non-cratonic lithosphere, induced by mantle depletion and dehydration, are considered to be the most important factor of long-term craton stability. Recent laboratory study about mantle rheology, however, argue the effects of water on upper mantle is rather small (Fei, et al 2013). We perform new numerical models and find long-term craton stability could be provided even with lower amounts of strengthening and/or buoyancy. Mantle plumes have been proposed to be play an important role on removal of continental root that observed such as in North China Craton and Kaapvaal craton. Our numerical model with realistic rheology and buoyancy structure shows that the mechanical erosion effects on the chemical root by the plume induced flow is very limited in the long term, unless it change the rheology and buoyancy of the root. In the end, I would further show some preliminary models about the thickening of cratonic lithosphere that might shield some light on the formation of craton.

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