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Progressive growth ...
Progressive growth of the Cerro Bayo cryptodome, Chachahuén volcano, Argentina : implications for viscous magma emplacement
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- Burchardt, Steffi, 1982- (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik,Center for Natural Hazard and Disaster Science, Uppsala University, Uppsala, Sweden
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- Mattsson, Tobias, 1990- (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik
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- Palma, J. Octavio (författare)
- Y‐TEC–CONICET. Av. Del Petroleo s/n‐(Entre 129 y 143), Berisso (CP 1923), Buenos Aires, Argentina
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- Galland, Olivier (författare)
- Physics of Geological Processes, The NJORD Centre, University of Oslo
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- Almqvist, Bjarne (författare)
- Uppsala universitet,Geofysik
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- Mair, Karen (författare)
- Physics of Geological Processes, The NJORD Centre, University of Oslo
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- Jerram, Dougal A. (författare)
- Dougal Earth Ltd. and CEED, University of Oslo
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- Hammer, Øyvind (författare)
- Natural History Museum, University of Oslo
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- Sun, Yang (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik
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(creator_code:org_t)
- 2019
- 2019
- Engelska.
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Ingår i: Journal of Geophysical Research - Solid Earth. - 2169-9313 .- 2169-9356. ; 124, s. 7934-7961
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Cryptodome and dome collapse is associated with volcanic hazards, such as, explosive eruptions, pyroclastic density currents, and volcanic edifice collapse. The study of the growth and evolution of volcanic domes provides vital information on the link between dome growth and the development of weakness zones that may cause collapse. The Cerro Bayo cryptodome is superbly exposed in the eroded Miocene Chachahuén volcano in the Neuquén basin, Argentina. Cerro Bayo is a >0.3 km3 trachyandesitic cryptodome that intruded within the uppermost kilometer of the Chachahuén volcano. Here we investigate the emplacement of the Cerro Bayo cryptodome using structural mapping, photogrammetry, 3D structural modelling and measurement of magma flow indicators, brittle deformation features and magnetic fabrics with anisotropy of magnetic susceptibility (AMS). Magma flow fabrics near the margin are concentric and indicate contact-parallel flow and internal inflation of the body. Magmatic and magnetic fabrics and fracture patterns in the interior of the cryptodome are more complex and outline several structural domains. These domains are separated by magmatic shear zones that accommodated intrusion growth. The shear zones locally overprint the earlier formed concentric fabric. The nature of the structural domains shows that emplacement of Cerro Bayo occurred in three stages that resemble the endogenous to exogenous growth of volcanic domes. The formation of magmatic shear zones during cryptodome formation may have a profound effect on cryptodome stability by creating weakness zones that increase the risk of collapse.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Nyckelord
- Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
- Geovetenskap med inriktning mot mineralogi, petrologi och tektonik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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