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Sacred ground; the Maipés necropolis of north-west Gran Canaria
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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2019 (English)In: Geology Today, Vol. 35, no 2, p. 55-62Article in journal (Refereed) Published
Abstract [en]

Gran Canaria, like most of the Canary Islands, shows evidence for young basaltic volcanism in the form of cinder cones and valley-hugging lava flows. These landforms were of no particular use to the aboriginal population, nor to the subsequent Spanish settlers, and young lava flows and lava fields are still referred to as ‘malpaís’ (badlands) in the Canary Islands. In north-west Gran Canaria, one such lava flow fills the bottom of a steep-sided valley, which reaches the sea at the present day village of Agaete. The lava flow erupted c. 3030 ± 90 yr bp and displays a total length of ∌ 11 km. At its distal end, just outside Agaete, it hosts one of Europe’s largest and most important pre-historic burial sites constructed of volcanic rock: the Maipés necropolis. Over 700 pre-historic tombs (or tumuli) constructed from the aa-type clinker materials have been identified on top of the valley-filling lava flow. The up to soccer-ball sized vesicular clinker fragments are sufficiently low in density to provide abundant, workable basalt blocks for the construction of the tumuli, allowing the pre-hispanic aboriginal population to create a large and magnificent ‘sacred ground’ in an otherwise barren landscape.

Place, publisher, year, edition, pages
2019. Vol. 35, no 2, p. 55-62
National Category
Geosciences, Multidisciplinary
Identifiers
URN: urn:nbn:se:uu:diva-383080DOI: 10.1111/gto.12262OAI: oai:DiVA.org:uu-383080DiVA, id: diva2:1314527
Available from: 2019-05-09 Created: 2019-05-09 Last updated: 2019-05-09
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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Publisher's full texthttps://onlinelibrary.wiley.com/doi/abs/10.1111/gto.12262

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