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Jolis, Ester
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Publications (10 of 30) Show all publications
Geiger, H., Troll, V. R., Jolis, E. M., Deegan, F. M., Harris, C., Hilton, D. R. & Freda, C. (2018). Multi-level magma plumbing at Agung and Batur volcanoes increases risk of hazardous eruptions. Scientific Reports, 8, Article ID 10547.
Open this publication in new window or tab >>Multi-level magma plumbing at Agung and Batur volcanoes increases risk of hazardous eruptions
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2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 10547Article in journal (Refereed) Published
Abstract [en]

The island of Bali in Indonesia is home to two active stratovolcanoes, Agung and Batur, but relatively little is known of their underlying magma plumbing systems. Here we define magma storage depths and isotopic evolution of the 1963 and 1974 eruptions using mineral-melt equilibrium thermobarometry and oxygen and helium isotopes in mineral separates. Olivine crystallised from a primitive magma and has average delta O-18 values of 4.8%. Clinopyroxene records magma storage at the crust-mantle boundary, and displays mantle-like isotope values for Helium (8.62 R-A) and delta O-18 (5.0-5.8%). Plagioclase reveals crystallisation in upper crustal storage reservoirs and shows delta O-18 values of 5.5-6.4%. Our new thermobarometry and isotope data thus corroborate earlier seismic and InSAR studies that inferred upper crustal magma storage in the region. This type of multi-level plumbing architecture could drive replenishing magma to rapid volatile saturation, thus increasing the likelihood of explosive eruptions and the consequent hazard potential for the population of Bali.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP, 2018
National Category
Geochemistry Geology
Identifiers
urn:nbn:se:uu:diva-361269 (URN)10.1038/s41598-018-28125-2 (DOI)000438343600057 ()30002471 (PubMedID)
Funder
Swedish Research CouncilThe Swedish Foundation for International Cooperation in Research and Higher Education (STINT), SA2015-6212
Available from: 2018-10-05 Created: 2018-10-05 Last updated: 2019-05-09Bibliographically approved
Budd, D. A., Troll, V. R., Deegan, F. M., Jolis, E., Smith, V., Whitehouse, M., . . . Bindeman, I. (2017). Magma reservoir dynamics at Toba caldera, Indonesia, recorded by oxygen isotope zoning in quartz. Scientific Reports, 7, Article ID 40624.
Open this publication in new window or tab >>Magma reservoir dynamics at Toba caldera, Indonesia, recorded by oxygen isotope zoning in quartz
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2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 40624Article in journal (Refereed) Published
Abstract [en]

Quartz is a common phase in high-silica igneous rocks and is resistant to post-eruptive alteration, thus offering a reliable record of magmatic processes in silicic magma systems. Here we employ the 75 ka Toba super-eruption as a case study to show that quartz can resolve late-stage temporal changes in magmatic δ18O values. Overall, Toba quartz crystals exhibit comparatively high δ18O values, up to 10.2‰, due to magma residence within, and assimilation of, local granite basement. However, some 40% of the analysed quartz crystals display a decrease in δ18O values in outermost growth zones compared to their cores, with values as low as 6.7‰ (maximum ∆core−rim = 1.8‰). These lower values are consistent with the limited zircon record available for Toba, and the crystallisation history of Toba quartz traces an influx of a low-δ18O component into the magma reservoir just prior to eruption. Here we argue that this late-stage low-δ18O component is derived from hydrothermally-altered roof material. Our study demonstrates that quartz isotope stratigraphy can resolve magmatic events that may remain undetected by whole-rock or zircon isotope studies, and that assimilation of altered roof material may represent a viable eruption trigger in large Toba-style magmatic systems.

National Category
Geochemistry
Identifiers
urn:nbn:se:uu:diva-316065 (URN)10.1038/srep40624 (DOI)000392659100001 ()28120860 (PubMedID)
Funder
Swedish Research CouncilThe Royal Swedish Academy of Sciences
Available from: 2017-02-24 Created: 2017-02-24 Last updated: 2019-09-26Bibliographically approved
Deegan, F., Troll, V. R., Whitehouse, M. J., Jolis, E. M. & Freda, C. (2016). Boron isotope fractionation in magma via crustal carbonate dissolution. Scientific Reports, 6, Article ID 30774.
Open this publication in new window or tab >>Boron isotope fractionation in magma via crustal carbonate dissolution
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2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, article id 30774Article in journal (Refereed) Published
Abstract [en]

Carbon dioxide released by arc volcanoes is widely considered to originate from the mantle and from subducted sediments. Fluids released from upper arc carbonates, however, have recently been proposed to help modulate arc CO2 fluxes. Here we use boron as a tracer, which substitutes for carbon in limestone, to further investigate crustal carbonate degassing in volcanic arcs. We performed laboratory experiments replicating limestone assimilation into magma at crustal pressure-temperature conditions and analysed boron isotope ratios in the resulting experimental glasses. Limestone dissolution and assimilation generates CaO-enriched glass near the reaction site and a CO2-dominated vapour phase. The CaO-rich glasses have extremely low delta B-11 values down to -41.5%, reflecting preferential partitioning of B-10 into the assimilating melt. Loss of B-11 from the reaction site occurs via the CO2 vapour phase generated during carbonate dissolution, which transports B-11 away from the reaction site as a boron-rich fluid phase. Our results demonstrate the efficacy of boron isotope fractionation during crustal carbonate assimilation and suggest that low delta B-11 melt values in arc magmas could flag shallow-level additions to the subduction cycle.

National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-302679 (URN)10.1038/srep30774 (DOI)000380873400001 ()27488228 (PubMedID)
Funder
Swedish Research CouncilThe Royal Swedish Academy of SciencesNatural‐Disaster Science
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2017-11-21Bibliographically approved
Troll, V., Deegan, F., Jolis, E. M., Budd, D., Dahrén, B. & Schwarzkopf, L. (2015). Ancient oral tradition describes volcano-earthquake interaction at Merapi volcano, Indonesia.. Geografiska Annaler. Series A, Physical Geography, 97(1), 137-166
Open this publication in new window or tab >>Ancient oral tradition describes volcano-earthquake interaction at Merapi volcano, Indonesia.
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2015 (English)In: Geografiska Annaler. Series A, Physical Geography, ISSN 0435-3676, E-ISSN 1468-0459, Vol. 97, no 1, p. 137-166Article in journal (Refereed) Published
National Category
Geosciences, Multidisciplinary
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
urn:nbn:se:uu:diva-240752 (URN)10.1111/geoa.12099 (DOI)000350500400010 ()
Available from: 2015-01-08 Created: 2015-01-08 Last updated: 2019-09-25Bibliographically approved
Blythe, L., Deegan, F., Freda, C., Jolis, E. M., Masotta, M., Misiti, V., . . . Troll, V. (2015). CO2 bubble generation and migration during magma–carbonate interaction. Contributions to Mineralogy and Petrology, 169(4), Article ID 42.
Open this publication in new window or tab >>CO2 bubble generation and migration during magma–carbonate interaction
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2015 (English)In: Contributions to Mineralogy and Petrology, ISSN 0010-7999, E-ISSN 1432-0967, Vol. 169, no 4, article id 42Article in journal (Refereed) Published
Abstract [en]

We conducted quantitative textural analysis of vesicles in high temperature and pressure carbonate assimilation experiments (1200 °C, 0.5 GPa) to investigate CO2 generation and subsequent bubble migration from carbonate into magma. We employed Mt. Merapi (Indonesia) and Mt. Vesuvius (Italy) compositions as magmatic starting materials and present three experimental series using (1) a dry basaltic-andesite, (2) a hydrous basaltic-andesite (2 wt% H2O), and (3) a hydrous shoshonite (2 wt% H2O). The duration of the experiments was varied from 0 to 300 s, and carbonate assimilation produced a CO2-rich fluid and CaO-enriched melts in all cases. The rate of carbonate assimilation, however, changed as a function of melt viscosity, which affected the 2D vesicle number, vesicle volume, and vesicle size distribution within each experiment. Relatively low-viscosity melts (i.e. Vesuvius experiments) facilitated efficient removal of bubbles from the reaction site. This allowed carbonate assimilation to continue unhindered and large volumes of CO2 to be liberated, a scenario thought to fuel sustained CO2-driven eruptions at the surface. Conversely, at higher viscosity (i.e. Merapi experiments), bubble migration became progressively inhibited and bubble concentration at the reaction site caused localised volatile over-pressure that can eventually trigger short-lived explosive outbursts. Melt viscosity therefore exerts a fundamental control on carbonate assimilation rates and, by consequence, the style of CO2-fuelled eruptions.

Keywords
CO2, Carbonate assimilation, Melt viscosity, Bubble size distribution, Eruption style
National Category
Geology
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
urn:nbn:se:uu:diva-271088 (URN)10.1007/s00410-015-1137-4 (DOI)000367847900001 ()
Funder
Swedish Research Council
Available from: 2016-01-05 Created: 2016-01-05 Last updated: 2017-12-01Bibliographically approved
Sahlström, F., Jonsson, E., Harris, C., Troll, V. & Jolis, E. M. (2015). O and C isotope study of Bastnäs-type rare earth element mineralisation, Bergslagen, Sweden. In: : . Paper presented at PacRim (pp. 439-443).
Open this publication in new window or tab >>O and C isotope study of Bastnäs-type rare earth element mineralisation, Bergslagen, Sweden
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2015 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Geochemistry
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
urn:nbn:se:uu:diva-271222 (URN)
Conference
PacRim
Available from: 2016-01-07 Created: 2016-01-07 Last updated: 2016-01-07
Jolis, E. M., Troll, V., Harris, C., Freda, C., Gaeta, M., Orsi, G. & Siebe, C. (2015). Skarn xenolith record crustal CO2 liberation during Pompeii and Pollena eruptions, Vesuvius volcanic system, central Italy. Chemical Geology, 415, 17-36
Open this publication in new window or tab >>Skarn xenolith record crustal CO2 liberation during Pompeii and Pollena eruptions, Vesuvius volcanic system, central Italy
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2015 (English)In: Chemical Geology, ISSN 0009-2541, E-ISSN 1872-6836, Vol. 415, p. 17-36Article in journal (Refereed) Published
Abstract [en]

Limestone assimilation and skarn formation are important processes in magmatic systems emplaced within carbonate-rich crust and can affect the composition of the magma and that of associated volcanic gas. In this study we focus on marble and calc-silicate (skarn) xenoliths from contact reactions between magma and carbonate wall-rock of the Vesuvius volcanic system. We present new elemental and C-O isotope data for marble and skarn xenoliths as well as for igneous rocks collected from the AD 79 (Pompeii) and AD 472 (Pollena) eruptions. The igneous samples have consistently high delta O-18 values (9.3 to 10.8 parts per thousand), but low H2O contents (<= 1.5%), indicating that magma-crust interaction prior to eruption took place. The marble xenoliths, in turn, record initial decarbonation reactions and fluid-mass exchange in their textures and delta C-13 and delta O-18 ranges, while the skarn xenoliths reflect prolonged magma-carbonate interaction and intense contact metamorphism. Skarn-xenoliths record Ca and Mg release from the original carbonate and uptake of Al and Si and span the full delta O-18 data range from unmetamorphosed carbonate (>18 parts per thousand) to values typical for Vesuvius magmatic rocks (similar to 7.5 parts per thousand), which implies that skarn xenoliths comprise carbonate and magmatic components. Textural and chemical evidence suggest that direct carbonate dissolution into the host magmas occurred as well as post-metamorphic skarn recycling, resulting in progressive Ca and Mg liberation from the skarn xenoliths into the magma. Magma-carbonate interaction is an additional source of CO2 during carbonate break-down and assimilation and we calculate the amount of extra volatile components likely liberated by contact metamorphic reactions before and during the investigated eruptions. We find that the extra CO2 added into the volcanic system could have outweighed the magmatic CO2 component by >= factor seven and thus likely increased the intensity of both the Pompeii and the Pollena eruptive events.

Keywords
Vesuvius volcanic system, Marble and skarn xenoliths, Magma-carbonate interaction, C and O isotopes, CO2 emission
National Category
Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
urn:nbn:se:uu:diva-265792 (URN)10.1016/j.chemgeo.2015.09.003 (DOI)000362454900002 ()
Funder
Swedish Research CouncilThe Royal Swedish Academy of Sciences
Available from: 2015-11-03 Created: 2015-11-03 Last updated: 2017-12-01Bibliographically approved
Troll, V., Deegan, F., Jolis, E. M., Budd, D. & Schwarzkopf, L. (2014). Ancient oral tradition describes volcano-earthquake interaction at Merapi volcano, Indonesia. In: : . Paper presented at City On volcanoes.
Open this publication in new window or tab >>Ancient oral tradition describes volcano-earthquake interaction at Merapi volcano, Indonesia
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2014 (English)Conference paper, Oral presentation only (Refereed)
National Category
Geology Geosciences, Multidisciplinary
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
urn:nbn:se:uu:diva-240929 (URN)
Conference
City On volcanoes
Available from: 2015-01-08 Created: 2015-01-08 Last updated: 2015-01-08
Muir, D., Jolis, E. M., Saunders, K. E. & Troll, V. (2014). Chemcial fingerprinting of crystal populations from Sekincau, Marapi and Sinabung volcanoes, Sumatra. In: : . Paper presented at VMSG.
Open this publication in new window or tab >>Chemcial fingerprinting of crystal populations from Sekincau, Marapi and Sinabung volcanoes, Sumatra
2014 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Geology Geosciences, Multidisciplinary
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
urn:nbn:se:uu:diva-240931 (URN)
Conference
VMSG
Available from: 2015-01-08 Created: 2015-01-08 Last updated: 2015-01-08
Troll, V., Deegan, F., Jolis, E. M., Dahrén, B., Blythe, L., Harris, C., . . . Freda, C. (2014). Magma storage at Krakatau volcanic complex. In: : . Paper presented at City On volcanoes.
Open this publication in new window or tab >>Magma storage at Krakatau volcanic complex
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2014 (English)Conference paper, Oral presentation only (Refereed)
National Category
Geology Geosciences, Multidisciplinary
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
urn:nbn:se:uu:diva-240897 (URN)
Conference
City On volcanoes
Available from: 2015-01-08 Created: 2015-01-08 Last updated: 2015-01-08
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