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Vertical AMS variation within basalt flow profiles from the Xitle volcano (Mexico) as indicator of heterogeneous strain in lava flows

Caballero-Miranda, C.I.; Alva-Valdivia, L.M.; González-Rangel, J.A.; Gogitchaishvili, A.; Urrutia-Fucugauchi, J.; Kontny, A.

Abstract:
The within-flow vertical variation of anisotropy of the magnetic susceptibility (AMS) of three basaltic flow profiles from the Xitle volcano were investigated in relation to the lava flow-induced shear strain. Rock magnetic properties and opaque microscopy studies have shown that the magnetic mineralogy is dominated by Ti-poor magnetite with subtle vertical variations in grain size distribution: PSD grains dominate in a thin bottommost zone, and from base to top from PSD-MD to PSD-SD grains are found. The vertical variation of AMS principal direction patterns permitted identification of two to three main lava zones, some subdivided into subzones. The lower zone is very similar in all profiles with the magnetic foliation dipping toward the flow source, whereas the upper zone has magnetic foliation dipping toward the flow direction or alternates between dipping against and toward the flow direction. The K1 (maximum AMS axis) directions tend to be mostly parallel to the flow direction in both zones. The middle zone shows AMS axes diverging among profiles. We present heterogeneous strain ellipse distribution models for different flow velocities assuming similar viscosity to explain the AMS directions and related parameters of each zone. ... mehr



Originalveröffentlichung
DOI: 10.1016/j.jvolgeores.2016.01.003
Scopus
Zitationen: 7
Web of Science
Zitationen: 7
Dimensions
Zitationen: 9
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 0377-0273, 1872-6097
KITopen-ID: 1000064328
Erschienen in Journal of volcanology and geothermal research
Verlag Elsevier
Band 311
Seiten 9-28
Nachgewiesen in Dimensions
Web of Science
Scopus
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