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Academic literature on the topic 'Anizotropie magnetické susceptibility (AMS)'
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Journal articles on the topic "Anizotropie magnetické susceptibility (AMS)"
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Skoršepa, Marko, and Rostislav Melichar. "Tektonická analýza okrajového zlomu blanenského prolomu." Geologické výzkumy na Moravě a ve Slezsku 24, no. 1-2 (2017). http://dx.doi.org/10.5817/gvms2017-1-2-31.
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Pískovna, ve které probíhal výzkum je situovaná jihozápadně od obce Dolní Lhota, která leží severně od města Brno. Pískovna odkrývá ve svoji jihozápadní části tektonický kontakt křídových sedimentů blanenského prolomu a brněnského masivu, který postupně zarůstá, takže v současnosti je jedna z posledních šancí pro studium tohoto tektonického zlomu. Blanenský prolom je vyplněn křídovými sedimenty s téměř subhorizontální vrstevnatostí. Prolom křídových sedimentů je proti granodioritu brněnského masivu omezený zmíněným zlomem směru SZ-JV se sklonem k jihozápadu. Křídové sedimenty mají u zlomu překocenou vrstevnatost strmě ukloněnou k jihozápadu, což je způsobeno ohnutím a vyvlečením vrstev podél zlomu. Navíc byla na studovaném místě nalezena také vrstevnatost strmě ukloněná jjv. směrem. Při studiu anizotropie magnetické susceptibility deformovaných jílů jádra zlomu byla zjištěna magnetická lineace K1 v horizontální pozici ve směru JZ-SV. Směr K2 se uklání k jihovýchodu a póly k magnetické foliaci (K3) ukazují, že magnetická foliace je mírně ukloněná převážně jjv. směrem, což odpovídá i naměřené vrstevnatosti v daném bodě. Dá se tedy usuzovat, že vrstevnatost v daném bodě a výstupy z AMS byly ovlivněné nějakým drobným příčným zlomem, podél kterého vedly deformace k vzniku anomálních orientací struktur. Takový systém příčných zlomů ve směru JZ-SV byl popsaný Havířem (1998).
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Mareček, Lukáš, and Rostislav Melichar. "ANIZOTROPIE MAGNETICKÉ SUSCEPTIBILITY HORNIN NA KONTAKTU METABAZITOVÉ A DIORITOVÉ ZÓNY BRNĚNSKÉHO MASIVU V OKOLÍ VELKÉ BABY U JINAČOVIC." Geologické výzkumy na Moravě a ve Slezsku 22, no. 1-2 (2016). http://dx.doi.org/10.5817/gvms2015-1-2-29.
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An anisotropy of magnetic susceptibility and temperature dependence on magnetic susceptibility were used to reveal an evolution history along the contact of the Metabasite and Diorite zones of Brno massif north of Brno-Řečkovice. The analysis of temperature dependence of magnetic susceptibility indicated that magnetic properties of all rocks in this area are essentially controlled by magnetite with a very small contribution of pyrhotite and hematite. These minerals were formed later than the primary magmatic minerals. Therefore we assume that magnetic fabrics in studied rocks reflect deformational processes which affected these rocks. There are three patterns in anisotropy of magnetic susceptibility (AMS) in studied rocks. In the first pattern detected in diorites, the magnetic foliation is striking NE–SW, dipping to the NW and there is subvertical magnetic lineation. The second planar magnetic indicates a rotational movement of microgranite rocks along the contact of the Metabasite and Diorite zones. The last pattern found in rocks of the Metabasite zone is magnetic foliation striking NNE–SSW dipping on the NWW and magnetic lineation trending to the SW with plunge of 42° and it shows normal faulting of studied area.
Dissertations / Theses on the topic "Anizotropie magnetické susceptibility (AMS)"
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Orságová, Lucie. "Mechanismy vmístění a magnetické stavby žil syenitových porfyrů (západní části Moldanubika)." Master's thesis, 2010. http://www.nusl.cz/ntk/nusl-296253.
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ENGLISH ABSTRACT We present new results of structural and magnetic (AMS) analyses of selected dikes of melasyenite, quartz melasyenite to melagranite porphyries accompanied by lamprophyres (minettes). The studied dike from the locality Nihošovice were dated by U-Pb method on zircons at 338 Ma. The asymmetric structural pattern of the studied dikes gives an excellent evidence for their emplacement and orientation of magmatic flow. The studied dikes were emplaced into: (i) Prevailing parts of the Central Bohemian Plutonic Complex (locality Malčice) and (ii) host high-grade metamorphic rocks of western part of the Moldanubian Zone (locality Nihošovice). Despite of the extensive area of occurrence, compositional variations and age of emplacement of these dikes are relatively narrow. Their geochemical and petrological compositions broadly correspond to ultrapotassic plutonic rocks (durbachites). The dikes are steeply dipping in trend ~NNW-SSE to ~W-E, with range in width between ~20 and ~25 meters. In general, our results show: (i) A relatively low degree of magnetic anisotropy (P= 1.012 - 1.152); (ii) Mostly oblate (planar) fabric, especially in marginal parts of the intrusive bodies (T= -0.091 - 0.941); (iii) Evidence for subhorizontal magmatic flow trajectory defined for a newtonian magma with typical...
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Tomek, Filip. "Magnetická stavba, tok magmatu a tektonická deformace ve vulkano-plutonických systémech." Doctoral thesis, 2015. http://www.nusl.cz/ntk/nusl-351001.
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Magnetic fabric, magma flow and tectonic deformation in volcano-plutonic systems ABSTRACT This Ph.D. thesis aims to investigate dynamics of emplacement and tectonic history of selected volcano-plutonic complexes in a continental magmatic arc and back arc setting. The thesis presents new data sets from five field areas, presented in separate chapters, which could be viewed as representing a vertical sections through upper part of an intermediate to felsic magmatic system. From top to bottom in this ‛imaginary' vertical system, the examined units are: (1) andesitic lava domes and (2) sub-volcanic magma chambers (<3 km deep) of the Miocene Štiavnica volcano- plutonic complex, Western Carpathians (Slovakia), (3) Shellenbarger pluton (<3 km depth) within the mid-Cretaceous Minarets caldera, Sierra Nevada batholith in California (USA), and ~7-10 km deep granitoids of (4) Lower-Cretaceous Wallowa batholith, Blue Mountains province in Oregon (USA) and (5) Late Devonian Staré Sedlo complex, central Bohemian Massif (Czech Republic). The research incorporates extensive field and structural data, supported by analysis of igneous textures and anisotropy of magnetic susceptibility (AMS). The latter is further accompanied by detailed examination of magnetic mineralogy using thermomagnetic measurements and optical and back...
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Burjak, Miroslav. "Strukturní vývoj, magnetická stavba a mechanismus exhumace podolského komplexu." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-329363.
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This thesis concentrates on a detailed field and structural analysis of the Podolsko complex, Moldanubian unit, Bohemian Massif, complemented by a microstructural study and analysis of magnetic susceptibility (AMS). The Podolsko complex occupies the footwall of a major Variscan normal shear zone and is juxtaposed against the southern to southeastern margin of the Central Bohemian Plutonic complex. During the field work, more than 160 outcrops were examined, the AMS samples were taken at 25 stations, and samples for microstructural studies were taken from 12 localities. On the micro-scale, leucocratic migmatites contain abundant garnet grains which may represent relics of an earlier (ultra-)high preassure metamorphic phase. Retrogression is obvious in other samples of biotite migmatites of the Moldanubian Variegated unit. The retrogression is marked by the presence of sillimanite and chlorite. The main tectonometamorphic event in the Podolsko complex is extensive migmatization coeval with formation of pervasive flat-laying fabric. This is corroborated by the AMS study which indicates concordant steep to flat-laying magnetic and mesoscopic foliations striking NNW-SSE. The AMS also shows that the subhorizontal N-S to NNW-SSE trending magnetic lineations in the Podolsko complex correspond to those in the...
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Obersteinová, Tereza. "Magnetická stavba spraší a fosilních půd na vybraných lokalitách jižní Moravy a středních Čech." Master's thesis, 2016. http://www.nusl.cz/ntk/nusl-349021.
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Pleistocene loess-palaeosol sequences provide a unique proxy-record enabling detailed reconstruction of Quaternary palaeoenvironments. Environmental magnetic methods are often used to read the natural archives. The loess-palaeosol sequences exposed in two sections located in southern Moravia and a sequence from central Bohemia were studied in a frame of this Diploma Thesis. Variations of bulk magnetic susceptibility, measured in the sediments, show similar pattern as in the Chinese loess-palaeosol bodies - i.e. palaeosols reveal higher magnetic susceptibility in comparison with loess due to magnetic enhancement. The magnetic enhancement is driven by weathering during pedogenic processes related to the formation of ultra-fine magnetite particles. The magnetite content is controlling the sediment magnetic behavior. The magnetic enhancement rate indicates more intense pedogenic processes in the Moravia in comparison with Bohemia. Magnetic fabric in studied loess, represented by space orientation of anisotropy of magnetic susceptibility ellipsoid, indicates dominating glacial wind palaeocurrents across the southern Moravia blowing from W or SW, respectively. The magnetic fabric in the central Bohemian sequence has revealed a dominant control of running water and re-deposition of the loess material...
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Černá, Aneta. "Rekonstrukce tečení lávových proudů Kozákova na základě studia magnetické a minerální stavby." Master's thesis, 2010. http://www.nusl.cz/ntk/nusl-296209.
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Combined anisotropy of magnetic susceptibility (AMS) and crystallographic studies were applied on a neogenne lava flow, for which we know the supposed flow path. Samples were studied under microscope, the minerals were analysed on microprobe, the orientation of olivine crystals was determined via EBSD and magnetic properties were studied. AMS data acquired from samples collected from representative outcrops of lava flow show weak preferred orientation of magnetite-ulvöspinel. EBSD analysis suggests only slight orientation of plagioclase in one sample. Analysed composition of olivine corresponds with mathematical model for eruption temperature and crystallization succession. Rootless cone (disorderly breccia cone) in lava body was found and desribed in the abandoned Machův lom quarry.
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Vitouš, Petr. "Od uložení po kalderovou resurgenci: dynamika pyroklastických hustotních proudů zjištěná magnetickou anisotropií z Teplického ryolitu, Český masiv." Master's thesis, 2020. http://www.nusl.cz/ntk/nusl-434998.
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Better understanding of pyroclastic density current (PDC) dynamics is one of the key volcanological focuses, as PDCs represent one of the most life-threatening volcanic hazards. PDCs associated with explosive collapse calderas are difficult to observe and examine directly, and thus research of internal architecture of calderas and their PDC deposits is focused on extinct and partly eroded volcano-plutonic systems. Such a case is the Late-Carboniferous Altenberg-Teplice caldera in NW Bohemian Massif, which exposes a large body of ignimbrites (deposits of the PDC) called Teplice rhyolite (an intra-caldera fill). This body is well exposed on the southern flank of the Krušné hory/Erzgebirge Mts., mainly its members: Teichweg, Lugstein-Pramenáč, Vlčí kámen-Medvědí vrch and Přední Cínovec. As these ignimbrites appear macroscopically isotropic, I employed the Anisotropy of magnetic susceptibility (AMS) in order to quantify their internal structure. A total of 1232 specimens from 63 sampling stations were analyzed for the AMS, complemented by susceptibility vs. temperature variations and petrographic observations. Obtained AMS data, carried by a mixture of paramagnetic ferrosilicates and low-Ti titanomagnetite, indicate various processes recorded in ignimbrites. The relatively oldest and moderately welded Teichweg...