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Emplacement and Seg...
Emplacement and Segment Geometry of Large, High-Viscosity Magmatic Sheets
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- Schmiedel, Tobias (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik
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- Burchardt, Steffi, 1982- (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik,Uppsala Univ, Ctr Nat Hazard & Disaster Sci, S-75236 Uppsala, Sweden.
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- Mattsson, Tobias (författare)
- Stockholms universitet,Institutionen för geologiska vetenskaper,University of St. Andrews, UK,Univ St Andrews, Sch Earth & Environm Sci, St Andrews KY16 9TS, Fife, Scotland.;Stockholm Univ, Dept Geol Sci, S-10961 Stockholm, Sweden.
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- Guldstrand, Frank (författare)
- Oslo Universitet, Norway,Univ Oslo, Dept Geosci, NJORD Ctr, N-0316 Oslo, Norway.
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- Galland, Olivier (författare)
- Oslo Universitet, Norway,Univ Oslo, Dept Geosci, NJORD Ctr, N-0316 Oslo, Norway.
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- Palma, Joaquín Octavio (författare)
- Subsecretariat of Mining of the Province of Buenos Aires, Argentina; National University of La Plata, Argentina,Subsecretariat Min Prov Buenos Aires, RA-1900 La Plata, Argentina.;Natl Univ La Plata, Fac Nat Sci & Museum, RA-1900 La Plata, Argentina.
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- Skogby, Henrik, 1956- (författare)
- Naturhistoriska riksmuseet,Enheten för geovetenskap,Swedish Museum Nat Hist, Dept Geosci, S-10405 Stockholm, Sweden.
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(creator_code:org_t)
- 2021-10-11
- 2021
- Engelska.
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Ingår i: Minerals. - : MDPI AG. - 2075-163X. ; 11:10
- Relaterad länk:
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https://doi.org/10.3...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- Understanding magma transport in sheet intrusions is crucial to interpreting volcanic unrest. Studies of dyke emplacement and geometry focus predominantly on low-viscosity, mafic dykes. Here, we present an in-depth study of two high-viscosity dykes (106 Pa·s) in the Chachahuén volcano, Argentina, the Great Dyke and the Sosa Dyke. To quantify dyke geometries, magma flow indicators, and magma viscosity, we combine photogrammetry, microstructural analysis, igneous petrology, Fourier-Transform-Infrared-Spectroscopy, and Anisotropy of Magnetic Susceptibility (AMS). Our results show that the dykes consist of 3 to 8 mappable segments up to 2 km long. Segments often end in a bifurcation, and segment tips are predominantly oval, but elliptical tips occur in the outermost segments of the Great Dyke. Furthermore, variations in host rocks have no observable impact on dyke geometry. AMS fabrics and other flow indicators in the Sosa Dyke show lateral magma flow in contrast to the vertical flow suggested by the segment geometries. A comparison with segment geometries of low-viscosity dykes shows that our high-viscosity dykes follow the same geometrical trend. In fact, the data compilation supports that dyke segment and tip geometries reflect different stages in dyke emplacement, questioning the current usage for final sheet geometries as proxies for emplacement mechanism.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Nyckelord
- magma transport
- high-viscosity dykes
- shallow crust
- igneous
- sills
- Chachahuen volcano
- anisotropy of magnetic susceptibility (AMS)
- magma flow indicator
- mineralogi, petrologi och tektonik
- Mineral Chemistry, Petrology and Tectonics
- The changing Earth
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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