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Palaeointensity of the geomagnetic field during upper cainozoic derived from palaeo-slags and porcellanites in north Bohemia

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Порчеллaнumы u naлеоченовые щлaкu нa mеррumорuu северноŭ Чехuu nре¶rt;сmaвляюm собоŭ nрuро¶rt;ныŭ мamерuaл, коmорыŭ очень nо¶rt;хо¶rt;um ¶rt;ля выве¶rt;енuя naлеомaгнumных нanрaвленuŭ u naлеоuнmенсuвносmuгеомaгнumного nоля, ¶rt;еŭсmвующего во время кaусmuческого uзмененuя. Эmuгорные nоро¶rt;ы, нaзывaемые эр¶rt;брaн¶rt;ы, вознuклu nо¶rt; влuянuем кaусmuческого uзмененuя nреuмущесmвенно nелumовых осa¶rt;очных nоро¶rt; всле¶rt;сmвuе сaмовозгорaнuя угольных слоев. Кaусmuческое uзмененuе uмело месmо в nерuо¶rt; оm верхнего nлuоценa ¶rt;о чеmверmuчного nерuо¶rt;a. В рaбоmе nре¶rt;ложены mрu uнmерnреmaцuонных nрuемa, nо¶rt;хо¶rt;ящuе ¶rt;ля вы¶rt;еленuя naлеоuнmенсuвносmu, оnuрaющuеся нa меmо¶rt;ы Телье u Нaгama. Новaя рaэрaбоmaннaя annaрamурa MAVACS (Magnetic Vacuum Control System) былa uсnользовaнa ¶rt;ля mермuческого рaзмaгнuчuвaнuя в сре¶rt;е высокого мaгнеmuческого вaкуумa. Был nре¶rt;ложен u nроверен nо¶rt;хо¶rt;, основaнныŭ нa мульmuкомnоненmном aнaлuзе мaгнеmuэaцuu. Кроме nолученuя меmо¶rt;uческuх знaчuŭ, было maкже усmaновлено, чmо uнmенсuвносmьгеомaгнumного nоля в uссле¶rt;уемыŭ nерuо¶rt; менялaсь в nре¶rt;елaх 48%±4%-154%±32% знaченuя uнmенсuвносmu современногогеомaгнumного nоля.

Summary

Porcellanites and palaeo-slags from North Bohemia are natural materials which can be used to derive the palaeomagnetic directions and palaeointensity of the geomagnetic field active at the time of caustic alteration. The origin of these rocks, called erdbrands, was due to the caustic alteration of predominantly pelitic sediments as a result of underground fires conditioned by spontaneous ignition of coal seams. The caustic alteration occurred during the Upper Pliocene to the Quaternary. Three procedure based on the methods by Thellier and Nagata are presented in the paper. The newly developed apparatus MAVACS (Magnetic Vacuum Control System) was used for the thermal demagnetization of samples. A procedure based on multi-component analysis was also proposed and tested. Besides some methodic results, it was found that the geomagnetic field intensity varied during the respective period within the limits of 48%±4% to 154%±32% of the present geomagnetic field intensity.

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  1. Geofyzika N. C. Brno, Dept. in Prague, Czechoslovakia

    Marta Krsová, Miroslav Krs, Petr Pruner & Richard Chvojka

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  1. Marta Krsová
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  2. Miroslav Krs
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  3. Petr Pruner
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  4. Richard Chvojka
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Krsová, M., Krs, M., Pruner, P. et al. Palaeointensity of the geomagnetic field during upper cainozoic derived from palaeo-slags and porcellanites in north Bohemia. Stud Geophys Geod 33, 338–361 (1989). https://doi.org/10.1007/BF01637689

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