Earth-prints repository, logo   DSpace

About DSpace Software
|earth-prints home page | roma library | bologna library | catania library | milano library | napoli library | palermo library
Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/8932

Authors: Moussallam, Y.*
Oppenheimer, C.*
Aiuppa, A.*
Giuidice, G.*
Moussallam, M.*
Kyle, P.*
Title: Hydrogen emissions from Erebus volcano, Antarctica
Title of journal: Bulletin of volcanology
Series/Report no.: /74 (2012)
Publisher: Springer Berlin Heidelberg
Issue Date: 1-Nov-2012
DOI: 10.1007/s00445-012-0649-2
Keywords: Erebus volcano; Hydrogen; Lava lake; Magma redox conditions; Volcanic degassing
Abstract: The continuous measurement of molecular hydrogen (H2) emissions from passively degassing volcanoes has recently been made possible using a new generation of low-cost electrochemical sensors. We have used such sensors to measure H2, along with SO2, H2O and CO2, in the gas and aerosol plume emitted from the phonolite lava lake at Erebus volcano, Antarctica. The measurements were made at the crater rim between December 2010 and January 2011. Combined with measurements of the long-term SO2 emission rate for Erebus, they indicate a characteristic H2 flux of 0. 03 kg s-1 (2. 8 Mg day-1). The observed H2 content in the plume is consistent with previous estimates of redox conditions in the lava lake inferred from mineral compositions and the observed CO2/CO ratio in the gas plume (~0. 9 log units below the quartz-fayalite-magnetite buffer). These measurements suggest that H2 does not combust at the surface of the lake, and that H2 is kinetically inert in the gas/aerosol plume, retaining the signature of the high-temperature chemical equilibrium reached in the lava lake. We also observe a cyclical variation in the H2/SO2 ratio with a period of ~10 min. These cycles correspond to oscillatory patterns of surface motion of the lava lake that have been interpreted as signs of a pulsatory magma supply at the top of the magmatic conduit.
Appears in Collections:04.08.01. Gases
Papers Published / Papers in press

Files in This Item:

File SizeFormatVisibility
Moussallam et al 2012.pdf2.8 MBAdobe PDFonly authorized users View/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


Share this record
Del.icio.us

Citeulike

Connotea

Facebook

Stumble it!

reddit


 

Valid XHTML 1.0! ICT Support, development & maintenance are provided by CINECA. Powered on DSpace Software. CINECA