Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Geology
Solidification And Morphology Of Submarine Lavas: A Dependence On Extrusion Rate, Ross W. Griffiths, Jonathan H. Fink
Solidification And Morphology Of Submarine Lavas: A Dependence On Extrusion Rate, Ross W. Griffiths, Jonathan H. Fink
Geology Faculty Publications and Presentations
The results of recent laboratory experiments with wax extruded beneath relatively cold water may be extrapolated to predict the surface morphology of submarine lavas as a function of the extrusion rate and melt vIscosity. The experiments with solidifying wax indicated that the surface morphology was controlled by a single parameter, the ratio of the time taken for the surface to solidify, and a time scale for lateral flow. For submarine basalts a solution of the cooling problem (which is dominated by conduction in the lava but convective heat transfer in the water) and estimates of lava viscosities place this parameter …
Textural Constraints On Effusive Silicic Volcanism: Beyond The Permeable Foam Model, Jonathan H. Fink, Steven W. Anderson, Curtis R. Manley
Textural Constraints On Effusive Silicic Volcanism: Beyond The Permeable Foam Model, Jonathan H. Fink, Steven W. Anderson, Curtis R. Manley
Geology Faculty Publications and Presentations
Transitions between explosive and effusive phases of silicic volcanic eruptions have been related either to stratification of volatiles in the source magma body or to the loss of volatiles through the permeable host rock of the conduit. One way to distinguish between these two models is to map and analyze the vesicular and glassy textures found in silicic lava flows. In this paper we present textural observations and isotopic evidence from active and Recent silicic lava flows which show thaI at least some vesiculation occurs during surface advance of extrusions, after magma has reached the earth's surface. This view is …