Non-Newtonian rheological law for highly crystalline dome lavas

Research Article| September 01, 2007 Non-Newtonian rheological law for highly crystalline dome lavas Yan Lavallée; Yan Lavallée 1Earth and Environment, Ludwig-Maximilians University Munich, Theresienstraße 41/III, D80333, Germany Search for other works by this author on: GSW Google Scholar Kai-Uwe Hess; Kai-Uwe Hess 1Earth and Environment, Ludwig-Maximilians University Munich, Theresienstraße 41/III, D80333, Germany Search for other works by this author on: GSW Google Scholar Benoit Cordonnier; Benoit Cordonnier 1Earth and Environment, Ludwig-Maximilians University Munich, Theresienstraße 41/III, D80333, Germany Search for other works by this author on: GSW Google Scholar Donald Bruce Dingwell Donald Bruce Dingwell 1Earth and Environment, Ludwig-Maximilians University Munich, Theresienstraße 41/III, D80333, Germany Search for other works by this author on: GSW Google Scholar Geology (2007) 35 (9): 843–846. https://doi.org/10.1130/G23594A.1 Article history received: 03 Jan 2007 rev-recd: 30 Apr 2007 accepted: 03 May 2007 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Yan Lavallée, Kai-Uwe Hess, Benoit Cordonnier, Donald Bruce Dingwell; Non-Newtonian rheological law for highly crystalline dome lavas. Geology 2007;; 35 (9): 843–846. doi: https://doi.org/10.1130/G23594A.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Volcanic eruption models are hampered by the lack of multiphase magmatic flow laws. Most rheological models estimate the viscosity of multiphase lavas via the Einstein-Roscoe equation, but this simplification cannot be used for high crystallinity and it does not consider the non-Newtonian strain-rate dependence of viscosity. We carried out parallel plate experiments on natural samples to simulate multiphase lava deformation under various stresses and strain rates. Multiphase lavas exhibit an important component of shear thinning, and appear to invalidate the adequacy of Einstein-Roscoe–based formulations for highly crystalline lava rheology. The remarkable singular dependence of viscosity (η) on strain rate (γ) yields a novel universal rheology law at eruptive temperatures (T), i.e., log η = −0.993 + 8974/T −0.543·log γ Our work reveals the importance of considering microcracking and viscous dissipation at very high strain rate (>10−3 s−1), explaining the occurrence of seismic swarms along the conduit margins, and consequently supporting plug-like magma ascent models. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.