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Pyroxene standards for SIMS oxygen isotope analysis and their application to Merapi volcano, Sunda arc, Indonesia
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics. Department of Geosciences, Swedish Museum of Natural History, SE-104 05, Stockholm, Sweden.
Department of Geosciences, Swedish Museum of Natural History, SE-104 05, Stockholm, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics.
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2016 (English)In: Chemical Geology, ISSN 0009-2541, E-ISSN 1872-6836, Vol. 447, p. 1-10Article in journal (Refereed) Published
Abstract [en]

Measurement of oxygen isotope ratios in common silicate minerals such as olivine, pyroxene, feldspar, garnet, and quartz is increasingly performed by Secondary Ion Mass Spectrometry (SIMS). However, certain mineral groups exhibit solid solution series, and the large compositional spectrum of these mineral phases will result in matrix effects during SIMS analysis. These matrix effects must be corrected through repeated analysis of compositionally similar standards to ensure accurate results. In order to widen the current applicability of SIMS to solid solution mineral groups in common igneous rocks, we performed SIMS homogeneity tests on new augite (NRM-AG-1) and enstatite (NRM-EN-2) reference materials sourced from Stromboli, Italy and Webster, North Carolina, respectively. Aliquots of the standard minerals were analysed by laser fluorination (LF) to establish their δ18O values. Repeated SIMS measurements were then performed on randomly oriented fragments of the same pyroxene crystals, which yielded a range in δ18O less than ± 0.42 and ± 0.58‰ (2σ) for NRM-AG-1 and NRM-EN-2, respectively. Homogeneity tests verified that NRM-AG-1 and NRM-EN-2 do not show any crystallographic orientation bias and that they are sufficiently homogeneous on the 20 μm scale to be used as routine mineral standards for SIMS δ18O analysis. We subsequently tested our new standard materials on recently erupted pyroxene crystals from Merapi volcano, Indonesia. The δ18O values for Merapi pyroxene obtained by SIMS (n = 204) agree within error with the LF-derived δ18O values for Merapi pyroxene but differ from bulk mineral and whole-rock data obtained by conventional fluorination. The bulk samples are offset to higher δ18O values as a result of incorporation of mineral and glass inclusions that in part reflects crustal contamination processes. The Merapi pyroxene SIMS data, in turn, display a frequency peak at 5.8‰, which allows us to estimate the δ18O value of the primary mafic magma at Merapi to ~ 6.1‰ when assuming closed system differentiation.

Place, publisher, year, edition, pages
2016. Vol. 447, p. 1-10
Keywords [en]
Pyroxene crystals; SIMS standardisation; δ18O analysis; Merapi volcano; Sub-Java primary δ18O
National Category
Geochemistry
Identifiers
URN: urn:nbn:se:uu:diva-309608DOI: 10.1016/j.chemgeo.2016.10.018ISI: 000390632600001OAI: oai:DiVA.org:uu-309608DiVA, id: diva2:1052281
Funder
Swedish Research CouncilThe Swedish Foundation for International Cooperation in Research and Higher Education (STINT)Available from: 2016-12-06 Created: 2016-12-06 Last updated: 2019-05-09Bibliographically approved
In thesis
1. Trans-crustal magma storage in contrasting tectonic settings
Open this publication in new window or tab >>Trans-crustal magma storage in contrasting tectonic settings
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Magmatic plumbing systems comprise magma chambers, sheet intrusions, and conduits which link the Earth’s deep interior with the Earth’s surface. As such, they are the structural framework of magma transport and storage that is governed by complex physical and chemical processes in magma reservoirs and through the interaction of magma bodies with surrounding crustal rocks over timescales from hours to millions of years. These geological processes, in turn, play a vital role in controlling eruptive behaviour and the magnitude of associated volcanic eruptions that impact the environment as well as human society. Our understanding of the nature and location of magmatic processes and plumbing system architecture remains, however, fragmentary. This lack of knowledge can partly be attributed to limits regarding the spatial resolution of geophysical methods and partly to geochemical uncertainties and errors in associated models. Ongoing advances in analytical techniques increase spatial, temporal, and chemical resolution, hence enabling us to gather more detailed knowledge on the structure and dynamics of magmatic systems, especially for individual volcanoes, but also in respect to the long-term evolution of magmatic provinces and ultimately the Earth as a whole. This process-oriented thesis examines fossil and active magmatic plumbing systems in Iceland, Indonesia, Cameroon, and the Canary Islands by applying a combination of traditional and state-of-the-art petrological and geochemical methods, mineral(-melt) thermobarometric modelling, and isotopic analytical techniques. The results add valuable insights to the growing body of evidence for multi-tiered plumbing systems in a number of volcano-tectonic settings and underline the importance of shallow-level magma storage and its influence on magma evolution and hazardous volcanic eruptions.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2019. p. 45
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1818
Keywords
magma plumbing systems, thermobarometry, oxygen isotope analysis, shallow arc storage systems
National Category
Geochemistry
Identifiers
urn:nbn:se:uu:diva-383081 (URN)978-91-513-0673-5 (ISBN)
Public defence
2019-09-06, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 09:00 (English)
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Supervisors
Available from: 2019-06-10 Created: 2019-05-09 Last updated: 2019-08-23

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Deegan, Frances M.Troll, Valentin R.Budd, David A.Geiger, Harri

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