Details
| Original language | English |
|---|---|
| Pages (from-to) | 125-129 |
| Number of pages | 5 |
| Journal | GEOLOGY |
| Volume | 49 |
| Issue number | 2 |
| Early online date | 18 Sept 2020 |
| Publication status | Published - 9 Feb 2021 |
Abstract
Most explosive, silicic volcanoes spend thousands of years in repose between eruptive events. The timing of the switch from repose to eruption is key to interpreting monitoring signals and improving the safety of people living close to active volcanoes. We addressed this question using a novel technique based on lithium isotopic (δ7 Li) and elemental concentration profiles within plagioclase crystals from the Mesa Falls Tuff of the Yellowstone volcanic system (Idaho and Wyoming, USA), constraining volatile degassing to occur on minimum time scales of tens of minutes prior to eruption. During this ephemeral time, Li abundances drop by a factor of four to 10 from crystal cores to rims, accompanied by an increase in δ7 Li of as much as 10%, reflecting diffusion-driven equilibration between plagioclase cores and outgassed, Li-poor melt. New times scales obtained in this study show the potential for rapid syneruptive changes in the volatile inventory of magmas.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geology
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In: GEOLOGY, Vol. 49, No. 2, 09.02.2021, p. 125-129.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Time scales of syneruptive volatile loss in silicic magmas quantified by Li isotopes
AU - Neukampf, J.
AU - Ellis, B. S.
AU - Laurent, O.
AU - Steinmann, L. K.
AU - Ubide, T.
AU - Oeser, M.
AU - Magna, T.
AU - Weyer, S.
AU - Bachmann, O.
N1 - Publisher Copyright: © 2020 Geological Society of America.
PY - 2021/2/9
Y1 - 2021/2/9
N2 - Most explosive, silicic volcanoes spend thousands of years in repose between eruptive events. The timing of the switch from repose to eruption is key to interpreting monitoring signals and improving the safety of people living close to active volcanoes. We addressed this question using a novel technique based on lithium isotopic (δ7 Li) and elemental concentration profiles within plagioclase crystals from the Mesa Falls Tuff of the Yellowstone volcanic system (Idaho and Wyoming, USA), constraining volatile degassing to occur on minimum time scales of tens of minutes prior to eruption. During this ephemeral time, Li abundances drop by a factor of four to 10 from crystal cores to rims, accompanied by an increase in δ7 Li of as much as 10%, reflecting diffusion-driven equilibration between plagioclase cores and outgassed, Li-poor melt. New times scales obtained in this study show the potential for rapid syneruptive changes in the volatile inventory of magmas.
AB - Most explosive, silicic volcanoes spend thousands of years in repose between eruptive events. The timing of the switch from repose to eruption is key to interpreting monitoring signals and improving the safety of people living close to active volcanoes. We addressed this question using a novel technique based on lithium isotopic (δ7 Li) and elemental concentration profiles within plagioclase crystals from the Mesa Falls Tuff of the Yellowstone volcanic system (Idaho and Wyoming, USA), constraining volatile degassing to occur on minimum time scales of tens of minutes prior to eruption. During this ephemeral time, Li abundances drop by a factor of four to 10 from crystal cores to rims, accompanied by an increase in δ7 Li of as much as 10%, reflecting diffusion-driven equilibration between plagioclase cores and outgassed, Li-poor melt. New times scales obtained in this study show the potential for rapid syneruptive changes in the volatile inventory of magmas.
UR - http://www.scopus.com/inward/record.url?scp=85099247318&partnerID=8YFLogxK
U2 - 10.1130/G47764.1
DO - 10.1130/G47764.1
M3 - Article
AN - SCOPUS:85099247318
VL - 49
SP - 125
EP - 129
JO - GEOLOGY
JF - GEOLOGY
SN - 0091-7613
IS - 2
ER -