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Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt

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Published on: August 7, 2017

Pyroclastic passage zones in glaciovolcanic sequences.

James K Russell¹, Benjamin R Edwards, Lucy A Porritt

¹Volcanology and Petrology Laboratory, Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4. krussell@eos.ubc.ca

Nature Communications

|May 9, 2013

Summary

We identified pyroclastic passage zones, new markers for ancient lake levels and ice thickness. This advances understanding of glaciovolcanism and paleoclimate on Earth and Mars.

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Area of Science:

Geology
Volcanology
Paleoclimatology

Background:

Volcanoes influence and record global climate change.
Passage zones in subaqueous volcanoes mark environmental shifts and record englacial lake elevations.
Deciphering climate-volcanism links is an emerging scientific field.

Purpose of the Study:

To describe the first passage zone preserved entirely within pyroclastic deposits.
To extend the passage-zone concept to explosive volcanism.
To improve paleoclimate reconstructions using glaciovolcanic evidence.

Main Methods:

Stratigraphic analysis of pyroclastic deposits.
Identification of passage zones formed during tephra cone growth.
Reconstruction of englacial lake levels and paleo-ice thickness.

Main Results:

A novel passage zone within pyroclastic deposits was identified, indicating tephra cone growth above a former englacial lake.
This finding expands the definition of passage zones to include explosive volcanic processes.
The study provides a new method for estimating past ice sheet thicknesses.

Conclusions:

Pyroclastic passage zones are valuable indicators of paleolake levels and paleo-ice thickness.
This discovery enhances our ability to study glaciovolcanism on Earth and Mars.
Improved paleoclimate models can be developed by incorporating these findings on past glaciations.