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The stiff upper LIP: investigating the High Arctic Large Igneous Province
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics. Uppsala University. (CEMPEG)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics. (CEMPEG)
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2016 (English)In: Geology Today, ISSN 0266-6979, E-ISSN 1365-2451, Vol. 32, no 3, p. 92-98Article in journal (Other (popular science, discussion, etc.)) Published
Abstract [en]

The Canadian Arctic Islands expose a complex network of dykes and sills that belong to the High Arctic Large Igneous Province (HALIP), which intruded volatile-rich sedimentary rocks of the Sverdrup Basin (shale, limestone, sandstone and evaporite) some 130 to 120 million years ago. There is thus great potential in studying the HALIP to learn how volatile-rich sedimentary rocks respond to magmatic heating events during LIP emplacement. The HALIP remains, however, one of the least well known LIPs on the planet due to its remote location, short field season, and harsh climate. A Canadian–Swedish team of geologists set out in summer 2015 to further explore HALIP sills and their sedimentary host rocks, including the sampling of igneous and meta-sedimentary rocks for subsequent geochemical analysis, and high pressure-temperature petrological experiments to help define the actual processes and time-scales of magma–sediment interaction. The research results will advance our understanding of how climate-active volatiles such as CO2, SO2 and CH4 are mobilised during the magma–sediment interaction related to LIP events, a process which is hypothesised to have drastically affected Earth's carbon and sulphur cycles. In addition, assimilation of sulphate evaporites, for example, is anticipated to trigger sulphide immiscibility in the magma bodies and in so doing could promote the formation of Ni-PGE ore bodies. Here we document the joys and challenges of ‘frontier arctic fieldwork’ and discuss some of our initial observations from the High Arctic Large Igneous Province.

Place, publisher, year, edition, pages
2016. Vol. 32, no 3, p. 92-98
National Category
Geosciences, Multidisciplinary
Identifiers
URN: urn:nbn:se:uu:diva-293548DOI: 10.1111/gto.12138OAI: oai:DiVA.org:uu-293548DiVA, id: diva2:927941
Funder
Swedish Polar Research SecretariatSwedish Research CouncilAvailable from: 2016-05-13 Created: 2016-05-13 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)
Opponent
Supervisors
Available from: 2019-06-10 Created: 2019-05-09 Last updated: 2019-06-10

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Deegan, FrancesTroll, ValentinGeiger, Harri

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