Geochemical constraints on volatile sources and subsurface conditions at Mount Martin, Mount Mageik, and Trident Volcanoes, Katmai Volcanic Cluster, Alaska.
Saved in:
| Title: | Geochemical constraints on volatile sources and subsurface conditions at Mount Martin, Mount Mageik, and Trident Volcanoes, Katmai Volcanic Cluster, Alaska. |
|---|---|
| Authors: | Lopez, T.1 tmlopez@alaska.edu, Tassi, F.2,3, Aiuppa, A.4,5, Galle, B.6, Rizzo, A.L.5, Fiebig, J.7, Capecchiacci, F.2,3, Giudice, G.5, Caliro, S.8, Tamburello, G.9 |
| Source: | Journal of Volcanology & Geothermal Research. Nov2017, Vol. 347, p64-81. 18p. |
| Subjects: | Geochemistry, Volcanism, Volcanic gases, Remote sensing |
| Geographic Terms: | Mount Katmai (Alaska) |
| Abstract: | We use the chemical and isotopic composition of volcanic gases and steam condensate, in situ measurements of plume composition and remote measurements of SO 2 flux to constrain volatile sources and characterize subvolcanic conditions at three persistently degassing and seismically active volcanoes within the Katmai Volcanic Cluster (KVC), Alaska: Mount Martin, Mount Mageik and Trident. In situ plume measurements of gas composition were collected at all three volcanoes using MultiGAS instruments to calculate gas ratios (e.g. CO 2 /H 2 S, SO 2 /H 2 S and H 2 O/H 2 S), and remote measurements of SO 2 column density were collected from Mount Martin and Mount Mageik by ultraviolet spectrometer systems to calculate SO 2 fluxes. Fumaroles were directly sampled for chemical and isotopic composition from Mount Mageik and Trident. Mid Ocean Ridge Basalt (MORB)-like 3 He/ 4 He ratios (~ 7.2–7.6 R c /R A ) within Mount Mageik and Trident's fumarole emissions and a moderate SO 2 flux (~ 75 t/d) from Mount Martin, combined with gas compositions dominated by H 2 O, CO 2 and H 2 S from all three volcanoes, indicate magma degassing and active hydrothermal systems in the subsurface of these volcanoes. Mount Martin's gas emissions have the lowest CO 2 /H 2 S ratio (~ 2–4) and highest SO 2 flux compared to the other KVC volcanoes, indicative of shallow magma degassing. Geothermometry techniques applied to Mount Mageik and Trident's fumarolic gas compositions suggest that their hydrothermal reservoirs are located at depths of ~ 0.2 and 4 km below the surface, respectively. Observations of an unusually reducing gas composition at Trident and organic material in the near-surface soils suggest that thermal decomposition of sediments may be influencing gas composition. When the measured gas compositions from Mount Mageik and Trident are compared with previous samples collected in the late 1990's, relatively stable magmatic-hydrothermal conditions are inferred for Mount Mageik, while gradual degassing of residual magma and contamination by shallow crustal fluids is inferred for Trident. The isotopic composition of volcanic gases emitted from Mount Mageik and Trident reflect mixing of subducted slab, mantle and crustal volatile sources, with organic sediment and carbonate being the predominant sources. Considering the close proximity of the target volcanoes in comparison with the depth to the subducted slab we speculate that Aleutian Arc volatiles are fed by a relatively homogeneous subducted fluid and that much of the apparent variability in volatile provenance can be explained by shallow crustal volatile sources and/or processes. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Volcanology & Geothermal Research is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
|---|---|
| Header | DbId: egs DbLabel: Engineering Source An: 126944796 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: Geochemical constraints on volatile sources and subsurface conditions at Mount Martin, Mount Mageik, and Trident Volcanoes, Katmai Volcanic Cluster, Alaska. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Lopez%2C+T%2E%22">Lopez, T.</searchLink><relatesTo>1</relatesTo><i> tmlopez@alaska.edu</i><br /><searchLink fieldCode="AR" term="%22Tassi%2C+F%2E%22">Tassi, F.</searchLink><relatesTo>2,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Aiuppa%2C+A%2E%22">Aiuppa, A.</searchLink><relatesTo>4,5</relatesTo><br /><searchLink fieldCode="AR" term="%22Galle%2C+B%2E%22">Galle, B.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Rizzo%2C+A%2EL%2E%22">Rizzo, A.L.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Fiebig%2C+J%2E%22">Fiebig, J.</searchLink><relatesTo>7</relatesTo><br /><searchLink fieldCode="AR" term="%22Capecchiacci%2C+F%2E%22">Capecchiacci, F.</searchLink><relatesTo>2,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Giudice%2C+G%2E%22">Giudice, G.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Caliro%2C+S%2E%22">Caliro, S.</searchLink><relatesTo>8</relatesTo><br /><searchLink fieldCode="AR" term="%22Tamburello%2C+G%2E%22">Tamburello, G.</searchLink><relatesTo>9</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Volcanology+%26+Geothermal+Research%22">Journal of Volcanology & Geothermal Research</searchLink>. Nov2017, Vol. 347, p64-81. 18p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Geochemistry%22">Geochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Volcanism%22">Volcanism</searchLink><br /><searchLink fieldCode="DE" term="%22Volcanic+gases%22">Volcanic gases</searchLink><br /><searchLink fieldCode="DE" term="%22Remote+sensing%22">Remote sensing</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Mount+Katmai+%28Alaska%29%22">Mount Katmai (Alaska)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: We use the chemical and isotopic composition of volcanic gases and steam condensate, in situ measurements of plume composition and remote measurements of SO 2 flux to constrain volatile sources and characterize subvolcanic conditions at three persistently degassing and seismically active volcanoes within the Katmai Volcanic Cluster (KVC), Alaska: Mount Martin, Mount Mageik and Trident. In situ plume measurements of gas composition were collected at all three volcanoes using MultiGAS instruments to calculate gas ratios (e.g. CO 2 /H 2 S, SO 2 /H 2 S and H 2 O/H 2 S), and remote measurements of SO 2 column density were collected from Mount Martin and Mount Mageik by ultraviolet spectrometer systems to calculate SO 2 fluxes. Fumaroles were directly sampled for chemical and isotopic composition from Mount Mageik and Trident. Mid Ocean Ridge Basalt (MORB)-like 3 He/ 4 He ratios (~ 7.2–7.6 R c /R A ) within Mount Mageik and Trident's fumarole emissions and a moderate SO 2 flux (~ 75 t/d) from Mount Martin, combined with gas compositions dominated by H 2 O, CO 2 and H 2 S from all three volcanoes, indicate magma degassing and active hydrothermal systems in the subsurface of these volcanoes. Mount Martin's gas emissions have the lowest CO 2 /H 2 S ratio (~ 2–4) and highest SO 2 flux compared to the other KVC volcanoes, indicative of shallow magma degassing. Geothermometry techniques applied to Mount Mageik and Trident's fumarolic gas compositions suggest that their hydrothermal reservoirs are located at depths of ~ 0.2 and 4 km below the surface, respectively. Observations of an unusually reducing gas composition at Trident and organic material in the near-surface soils suggest that thermal decomposition of sediments may be influencing gas composition. When the measured gas compositions from Mount Mageik and Trident are compared with previous samples collected in the late 1990's, relatively stable magmatic-hydrothermal conditions are inferred for Mount Mageik, while gradual degassing of residual magma and contamination by shallow crustal fluids is inferred for Trident. The isotopic composition of volcanic gases emitted from Mount Mageik and Trident reflect mixing of subducted slab, mantle and crustal volatile sources, with organic sediment and carbonate being the predominant sources. Considering the close proximity of the target volcanoes in comparison with the depth to the subducted slab we speculate that Aleutian Arc volatiles are fed by a relatively homogeneous subducted fluid and that much of the apparent variability in volatile provenance can be explained by shallow crustal volatile sources and/or processes. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Volcanology & Geothermal Research is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=126944796 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jvolgeores.2017.09.001 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 18 StartPage: 64 Subjects: – SubjectFull: Geochemistry Type: general – SubjectFull: Volcanism Type: general – SubjectFull: Volcanic gases Type: general – SubjectFull: Remote sensing Type: general – SubjectFull: Mount Katmai (Alaska) Type: general Titles: – TitleFull: Geochemical constraints on volatile sources and subsurface conditions at Mount Martin, Mount Mageik, and Trident Volcanoes, Katmai Volcanic Cluster, Alaska. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Lopez, T. – PersonEntity: Name: NameFull: Tassi, F. – PersonEntity: Name: NameFull: Aiuppa, A. – PersonEntity: Name: NameFull: Galle, B. – PersonEntity: Name: NameFull: Rizzo, A.L. – PersonEntity: Name: NameFull: Fiebig, J. – PersonEntity: Name: NameFull: Capecchiacci, F. – PersonEntity: Name: NameFull: Giudice, G. – PersonEntity: Name: NameFull: Caliro, S. – PersonEntity: Name: NameFull: Tamburello, G. IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 11 Text: Nov2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 03770273 Numbering: – Type: volume Value: 347 Titles: – TitleFull: Journal of Volcanology & Geothermal Research Type: main |
| ResultId | 1 |
