caa a22 4500 477062563 CHVBK 20180405111405.0 cr unu---uuuuu 170330e19961101xx s 000 0 eng 10.1007/s004450050140 doi (NATIONALLICENCE)springer-10.1007/s004450050140 Relationships between deformation and mixing processes in lava flows: a case study from Salina (Aeolian Islands, Tyrrhenian Sea) [Elektronische Daten] [Rosanna De Rosa, Roberto Mazzuoli, Guido Ventura]  The massive unit of a lava flow from Porri volcano (Salina, Aeolian Islands) displays many unusual structures related to the physical interaction between two different magmas. The magma A represents approximately 80% of the exposed lava surface; it has a crystal content of 51 vol.% and a dacitic glass composition (SiO2=63-64 wt.%). The magma B has a basaltic-andesite glass composition (SiO2=54-55 wt.%) and a crystal content of approximately 18 vol.%. It occurs as pillow-like enclaves, banding, boudin-like and rolling structures which are hosted in magma A. Structural analysis suggests that banding and boudin-like structures are the result of the deformation of enclaves at different shear strain. The linear correlation between strain and stratigraphic height of the measured elements indicates a single mode of deformation. We deduce that the component B deformed according to a simple shear model. Glass analyses of the A-B boundary indicate that A and B liquids mix together at high shear strain, whereas only mingling occurs at low shear strain. This suggests that the amount of deformation (i.e. forced convection) plays an important role in the formation of hybrid magmas. High shear strain may induce stretching, shearing and rolling of fluids which promote both forced convection and dynamical diffusion processes. These processes allow mixing of magmas with large differences in their physical properties. Springer-Verlag Berlin Heidelberg, 1996 Key words Strain analysis nationallicence Mixing/mingling processes nationallicence Lava flow nationallicence Calc-alkaline rocks nationallicence Aeolian Islands nationallicence Rosa Rosanna De Dipartimento Geomineralogico, Università Campus, Via Orabona 4, I-70124 Bari Italy, IT aut Mazzuoli Roberto Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, I-56126 Pisa, Italy, IT aut Ventura Guido Osservatorio Vesuviano, Via Osservatorio, I-80056 Ercolano (NA), Italy Fax: +39 81 7390644, IT aut https://doi.org/10.1007/s004450050140 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s004450050140 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rosa Rosanna De Dipartimento Geomineralogico, Università Campus, Via Orabona 4, I-70124 Bari Italy, IT aut NATIONALLICENCE 700 1- Mazzuoli Roberto Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, I-56126 Pisa, Italy, IT aut NATIONALLICENCE 700 1- Ventura Guido Osservatorio Vesuviano, Via Osservatorio, I-80056 Ercolano (NA), Italy Fax: +39 81 7390644, IT aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer