Ovda Fluctus (6.1掳S, 95.5掳E) is a lava flow complex on the equatorial tessera highlands of Ovda Regio, Venus. We examined its morphology and geologic setting to determine if its apparent emplacement rheology is consistent with silica-rich (e.g., rhyolitic) lava; this...
Ovda Fluctus, Venus is interpreted to be a thick lava flow with a folded surface. On Earth, these characteristics are more commonly found on lava flows containing >54 wt.% SiO2. Identifying such silica-rich flows on Venus would imply that the composition of the Venus surface and interior is...
Emplacement dynamics of a crystal-rich, highly viscous trachytic flow of the Sancy stratovolcano, France Emplacement dynamics of highly viscous, silicic lava flows remain poorly constrained due to a lack of consideration of crystal-rich cases. Emplacement models mostly apply to glassy or microlitic...
Allard P (2010) A CO2-rich gas trigger of explosive paroxysms at Stromboli volcano, Italy. J Volcanol Geotherm Res 189:363–374 Article Google Scholar Allard P, Burton M, Muré F (2005) Spectroscopic evidence for a lava fountain driven by previously accumulated magmatic gas. Nature 433:407...
Laboratory analyses show the silica to be consistently present as a deposited phase, including incrustations downwind from solfatara vents, cementing agent for ash duricrusts, and thin coatings on the youngest lava flow surfaces. A second, Ti-rich upper coating on young flows also influences ...
Subaqueous flowAlterationSubaqueous high-silica rhyolite in Prosser Township, southern Abitibi Subprovince, Ontario, consists of intercalated, thin (<15 m; low aspect ratio < 0.3) aphyric lavas with brown felsic tuffs, overlain by a pyroclastic pumice- and spatter-rich tuff breccia and are capped...
Silica occurs as elongate crystals or K-rich glass + silica. Their mineral assemblage and ferroan compositions are similar to those of the symplectite clasts, but their textural morphologies are different to those of the ARFe clasts [56]. Fagan et al. [56] implied a petrological connection ...
The ubiquity of the volatile-rich high alkaline magmatic activity and its isotopic homogeneity is inferred to be the latest and largest metasomatic event related to the late intraplate activity of the Kerguelen mantle plume.doi:10.4454/OFIOLITI.V24I1B.60Bertrand N. Moine...