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    Interpreting inverse magnetic fabric in Miocene dikes from Eastern Iceland

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    Type
    Article
    Authors
    Trippanera, Daniele cc
    Porreca, M. cc
    Urbani, S. cc
    Kissel, C. cc
    Winkler, A.
    Sagnotti, L. cc
    Nazzareni, S.
    Acocella, V.
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2020-11-09
    Online Publication Date
    2020-11-09
    Print Publication Date
    2020-11
    Embargo End Date
    2021-04-29
    Submitted Date
    2020-05-30
    Permanent link to this record
    http://hdl.handle.net/10754/665787
    
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    Abstract
    Anisotropy of Magnetic Susceptibility (AMS) is a valid tool to investigate magma flow direction within dikes. However, geometrically inverse magnetic fabric characterized by maximum magnetic susceptibility axis (kmax) perpendicular to the dike wall, may complicate the interpretation of flow trajectories. To better understand the nature of this fabric, we present a multi-scale study on 19 dikes (383 samples) in the Miocene Alftafjordur volcanic system (Iceland), where 80% of the samples show a geometrically inverse magnetic fabric. We carried out (1) AMS measurements at different magnetic fields and temperatures, along with Anisotropy of Anhystheretic Remanent Magnetization (AARM) analysis; (2) Hysteresis loops and FORC diagrams; (3) thin section analysis; (4) structural fieldwork. A variable Ti-content (10<x<60, Fe3-xTixO4) titanomagnetite is the main magnetic carrier and the contribution of the paramagnetic elongated crystals to the magnetic fabric is negligible. Single domain (SD) is not the prevailing domain state of the magnetic particles, suggesting that its occurrence cannot be the main cause for the inverse fabric. AMS analysis at different fields and temperatures along with AARM allow us to exclude any mineral phase change of the titanomagnetite across the dike. Nevertheless, kmax is parallel to a diffuse horizontal column-like fracture pattern perpendicularly oriented with respect to the dike strike. This suggests that the Ti-magnetite mineral orientation during dike cooling was affected by the fracture network progressively developing columnar basalts. This study demonstrates that the interpretation of AMS data on old and deep volcanic bodies is not straightforward and observations at different scales are required.
    Citation
    Trippanera, D., Porreca, M., Urbani, S., Kissel, C., Winkler, A., Sagnotti, L., … Acocella, V. (2020). Interpreting inverse magnetic fabric in Miocene dikes from Eastern Iceland. Journal of Geophysical Research: Solid Earth. doi:10.1029/2020jb020306
    Publisher
    American Geophysical Union (AGU)
    Journal
    Journal of Geophysical Research: Solid Earth
    DOI
    10.1029/2020jb020306
    Additional Links
    https://onlinelibrary.wiley.com/doi/10.1029/2020JB020306
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    Is Supplemented By:
    • [Dataset]
      Trippanera, D., Urbani, S., Kissel, C., Winkler, A., Sagnotti, L., Nazzareni, S., Acocella, V., & Porreca, M. (2020). Magnetic susceptibility and thin sections data from the the Alftafjordur volcanic system in Eastern Iceland [Data set]. GFZ Data Services. https://doi.org/10.5880/FIDGEO.2020.026. DOI: 10.5880/fidgeo.2020.026 Handle: 10754/668591
    ae974a485f413a2113503eed53cd6c53
    10.1029/2020jb020306
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division

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