Show simple item record

dc.contributor.authorOppenheimer, Clive
dc.contributor.authorScaillet, B
dc.contributor.authorWoods, Andrew
dc.contributor.authorSutton, AJ
dc.contributor.authorElias, T
dc.contributor.authorMoussallam, Y
dc.date.accessioned2018-11-12T14:30:38Z
dc.date.available2018-11-12T14:30:38Z
dc.date.issued2018-09
dc.identifier.issn1752-0894
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/284927
dc.description.abstractGas bubbles form as magmas ascend in the crust and exsolve volatiles. These bubbles evolve chemically and physically as magma decompression and crystallization proceed. It is generally assumed that the gas remains in thermal equilibrium with the melt but the relationship between gas and melt redox state is debated. Here, using absorption spectroscopy, we report the composition of gases emitted from the lava lake of Kīlauea Volcano, Hawaii, and calculate equilibrium conditions for the gas emissions. Our observations span a transition between more and less vigorous-degassing regimes. They reveal a temperature range of up to 250 °C, and progressive oxidation of the gas, relative to solid rock buffers, with decreasing gas temperature. We suggest that these phenomena are the result of changing gas bubble size. We find that even for more viscous magmas, fast-rising bubbles can cool adiabatically, and lose the redox signature of their associated melts. This process can result in rapid changes in the abundances of redox-sensitive gas species. Gas composition is monitored at many volcanoes in support of hazard assessment but time averaging of observations can mask such variability arising from the dynamics of degassing. In addition, the observed redox decoupling between gas and melt calls for caution in using lava chemistry to infer the composition of associated volcanic gases.
dc.publisherSpringer Science and Business Media LLC
dc.titleInfluence of eruptive style on volcanic gas emission chemistry and temperature
dc.typeArticle
prism.endingPage681
prism.issueIdentifier9
prism.publicationDate2018
prism.publicationNameNature Geoscience
prism.startingPage678
prism.volume11
dc.identifier.doi10.17863/CAM.32297
dcterms.dateAccepted2018-06-25
rioxxterms.versionofrecord10.1038/s41561-018-0194-5
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2018-09-01
dc.contributor.orcidOppenheimer, Clive [0000-0003-4506-7260]
dc.contributor.orcidElias, T [0000-0002-9592-4518]
dc.identifier.eissn1752-0908
rioxxterms.typeJournal Article/Review
pubs.funder-project-idNERC (via University of Leeds) (GA/13M/031)
pubs.funder-project-idNatural Environment Research Council (NE/N009312/1)
cam.issuedOnline2018-08-06
rioxxterms.freetoread.startdate2019-02-06


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record