Title

Glacial Sculpting of the Tana Island Volcano

Presenter

Henry Lanman

Abstract

The Tana Volcano is home to one of the last receding glaciers in the Aleutian Islands, despite having one of the lower summit elevations. Tana has the ability to host a glacier at such low elevations due to a large basin area to accumulate snow. The Tana Glacier eroded the soft hydrothermally altered lavas, creating a large basin area to allow for further snow accumulation. This multi-hued rock has significantly different erosional properties relative to unaltered lavas on Tana. I mapped a suite of moraines and compared the composition and morphology of moraines containing altered and unaltered lavas. This study furthers our understanding of the climate on the Islands of Four Mountains, and also how host rock affects the erosional and depositional processes of a glacier.

Faculty Sponsor

Lyman Perisco and Kirsten Nicolaysen

Sponsor Department/Programs

Geology

Tracks

Geology and Climate

Location

Science 159

Presentation Type

Oral Presentation

This document is currently not available here.

Share

COinS
 
Apr 11th, 11:00 AM Apr 11th, 11:15 AM

Glacial Sculpting of the Tana Island Volcano

Science 159

The Tana Volcano is home to one of the last receding glaciers in the Aleutian Islands, despite having one of the lower summit elevations. Tana has the ability to host a glacier at such low elevations due to a large basin area to accumulate snow. The Tana Glacier eroded the soft hydrothermally altered lavas, creating a large basin area to allow for further snow accumulation. This multi-hued rock has significantly different erosional properties relative to unaltered lavas on Tana. I mapped a suite of moraines and compared the composition and morphology of moraines containing altered and unaltered lavas. This study furthers our understanding of the climate on the Islands of Four Mountains, and also how host rock affects the erosional and depositional processes of a glacier.