Published In

Journal of Geophysical Research

Document Type

Article

Publication Date

10-10-2000

Subjects

Lava flows -- Morphology, Volcanic eruptions -- History, Volcanic eruptions -- Forecasting, Glaciers -- Measurement, Lava flows -- Effect of ice sheets on

Abstract

Structures resulting from lava and ice interaction are common at glaciated stratovolcanoes. During summit eruptions at stratovolcanoes, meltwater is produced and travels freely down steep slopes and thin permeable valley glaciers, eroding the ice and enlarging preexisting glacial drainages. As a result, in this environment have produced few catastrophic floods. Lava flowing into the open channels and voids in the glaciers becomes confined and grows thicker, filling the available space and producing steep-sided bodies with smooth, bulbous contact surfaces. Quenching of lava against ice or by water forms small-scale features such as tensional fractures and glass. As the amount of meltwater in contact with the lava increases, the type and abundance of smaller-scale features become similar to those produced during subglacial eruptions in meltwater lakes. Identification of large- and small-scale lava-ice contact features in the field can be used to reconstruct paleoglacial extent and, combined with geochronology of lavas, to determine past paleoclimate. An understanding of lava-ice interaction allows us to better access the hazards posed by future eruptions at glaciated volcanoes.

Description

This is the publisher's final pdf. Originally published in Journal of Geophysical Research (http://agupubs.onlinelibrary.wiley.com/agu/jgr/journal/10.1002/%28ISSN%292156-2202/) and is copyrighted by American Geophysical Union (http://www.agu.org/)

*At the time of publication Jonathan Fink was affiliated with Arizona State University

Persistent Identifier

http://archives.pdx.edu/ds/psu/13286

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