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- W4281566903 abstract "Reconstruction of the Upper Cambrian Křivoklát-Rokycany Volcanic Complex was made using anisotropy of magnetic susceptibility (AMS). The correlation of AMS with visible structures at a few sites showed that the most important and reliable information was the direction of magnetic lineation K 1 that determines the direction of a lava flow . The analysis of K 1 directions together with radially propagating dikes helped to determine the feeding area along the NW rim of the volcanic complex. One andesite feeder and one rhyodacite feeder were recognized with certainty. In addition, K 1 directions pointed to a suspicious area with the presence of another andesite feeder in a caldera-like structure. The evaluation of data strongly suggests that magnetic susceptibility in andesite lavas increases with the distance from the feeder and also with the distance towards the upper part of the andesitic lava flow. We suggest that this might be related to the degree of oxidation of the lava flow before solidification as a reaction with oxygen in the atmosphere. Oxygen can react with FeO in the andesite melt, which consequently results in the formation of magnetite . • AMS directional analysis in lava flows is a useful tool for finding magma feeders • Recognized magma flow direction in andesite correlates with magnetic lineation • Thermomagnetic curves can help to distinguish similar volcanic rocks • Andesite lava consumes O 2 from the air through the surface of the lava flow • Fe-phases change from paramagnetic to ferromagnetic due to andesite magma oxidation" @default.
- W4281566903 created "2022-05-27" @default.
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- W4281566903 date "2022-08-01" @default.
- W4281566903 modified "2023-09-28" @default.
- W4281566903 title "Reconstruction of ancient volcanic complexes using magnetic signature: A case study from Cambrian andesite lava flow, Bohemian Massif" @default.
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- W4281566903 doi "https://doi.org/10.1016/j.jvolgeores.2022.107591" @default.
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