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Fumarole/plume and diffuse CO2 emission from Sierra Negra caldera, Galapagos archipelago
https://nied-repo.bosai.go.jp/records/4160
https://nied-repo.bosai.go.jp/records/41600394d1c8-a1d1-4fa8-aa61-0523576ef945
| Item type | researchmap(1) | |||||||||||||||||||||||
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| 公開日 | 2023-03-30 | |||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||
| タイトル | Fumarole/plume and diffuse CO2 emission from Sierra Negra caldera, Galapagos archipelago | |||||||||||||||||||||||
| 言語 | ||||||||||||||||||||||||
| 言語 | eng | |||||||||||||||||||||||
| 著者 |
Eleazar Padron
× Eleazar Padron
× Pedro A. Hernandez
× Nemesio M. Perez
× Theofilos Toulkeridis
× Gladys Melian
× Jose Barrancos
× Giorgio Virgili
× Hirochika Sumino
× Kenji Notsu
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| 抄録 | ||||||||||||||||||||||||
| 内容記述タイプ | Other | |||||||||||||||||||||||
| 内容記述 | Measurements of visible and diffuse gas emission were conducted in 2006 at the summit of Sierra Negra volcano, Galapagos, with the aim to better characterize degassing after the 2005 eruption. A total SO2 emission of 11 +/- 2 t day(-1) was derived from miniature differential optical absorption spectrometer (mini-DOAS) ground-based measurements of the plume emanating from the Mini Azufral fumarolic area, the most important site of visible degassing at Sierra Negra volcano. Using a portable multigas system, the H2S/SO2, CO2/SO2, and H2O/SO2 molar ratios in the Mina Azufral plume emissions were found to be 0.41, 52.2, and 867.9, respectively. The corresponding H2O, CO2, and H2S emission rates were 562, 394, and 3 t day(-1), respectively. The total output of diffuse CO2 emissions from the summit of Sierra Negra volcano was 990 +/- 85 t day(-1), with 605 t day(-1) being released by a deep source. The diffuse-to-plume CO2 emission ratio was about 1.5. Mina Azufral fumaroles released gasses containing 73.6 mol% of H2O; the main noncondensable components amounted to 97.4 mol% CO2, 1.5 mol% SO2, 0.6 mol% H2S, and 0.35 mol% N-2. The higher H2S/SO2 ratio values found in 2006 as compared to those reported before the 2005 eruption reveal a significant hydrothermal contribution to the fumarolic emissions. He-3/He-4 ratios measured at Mina Azufral fumarolic discharges showed values of 17.88 +/- 0.25 R (A) , indicating a mid-ocean ridge basalts (MORB) and a Galapagos plume contribution of 53 and 47 %, respectively. | |||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||
| 書誌情報 |
en : BULLETIN OF VOLCANOLOGY 巻 74, 号 6, p. 1509-1519 |
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| 言語 | en | |||||||||||||||||||||||
| 出版者 | SPRINGER | |||||||||||||||||||||||
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| 収録物識別子タイプ | EISSN | |||||||||||||||||||||||
| 収録物識別子 | 1432-0819 | |||||||||||||||||||||||
| DOI | ||||||||||||||||||||||||
| 関連識別子 | 10.1007/s00445-012-0610-4 | |||||||||||||||||||||||
