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  • 11
    Electronic Resource
    Electronic Resource
    Applicability of palaeomagnetism of pyrrhotite to ore-genetic studies (1968)
    Springer
    Mineralium deposita 3 (1968), S. 242-248 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung Pyrrhotin, mit einem hohen Grad magnetischer Anisotropie, ist bisher für die paläomagnetische Datierung unbeachtet geblieben. Diese Arbeit will zeigen, daß feinkörnige Pyrrhotinaggregate hydrothermalen Ursprungs für paläomagnetische Untersuchungen geeignet sind, was am Beispiel polymetallischer Gänge von Turkaňk in Kutná Hora in Zentralböhmen dargestellt wird. Es ist anzunehmen, daß auch andere Vorkommen hydrothermaler Pyrrhotinaggregate in denen regelmäßig verteilte Körner richtungslos orientiert vorliegen und so ein magnetisch isotropes Medium bilden, sich für paläomagnetische Untersuchungen eignen.
    Notes: Abstract Pyrrhotite has never before been used in palaeomagnetic investigations, being highly anisotropic magnetically. The aim of this paper is to show that fine-grained pyrrhotite aggregates of hydrothermal origin can be used for palaeomagnetic purposes. This has been proved with polymetallic Turkaňk veins from Kutná Hora in Central Bohemia as an example. It can be assumed that other localities with occurrence of hydrothermal pyrrhotite aggregates which contain directionless, uniformly scattered pyrrhotite grains and therefore forming a magnetically isotropic medium may be suitable for palaeomagnetic studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00207437
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  • 12
    Electronic Resource
    Electronic Resource
    Rift tectonics development in the light of geophysical data: Red sea region (1977)
    Springer
    Studia geophysica et geodaetica 21 (1977), S. 342-350 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The paper discusses geophysical phenomena observed over tholeiitic dykes detected in the Eastern Desert of Egypt (Nubian Block). The dykes show specific physical properties and are either normally or reversely polarized along their whole length over 120 km. Dykes of similar properties may also be interpreted from airborne geophysical maps in Saudi Arabia (Arabian Block). Magnetic fields of the tholeiitic dykes were interpreted quantitatively: they fit the magnetic pattern over the Red Sea. The study emphasizes those geophysical phenomena which may serve as criteria for recognition of regions with rift tectonics development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01613266
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  • 13
    Electronic Resource
    Electronic Resource
    Magnetism of natural pyrrhotite, haematite and ilmenite (1971)
    Springer
    Studia geophysica et geodaetica 15 (1971), S. 161-172 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The paper deals with the magnetic properties of the natural minerals haematite, ilmenite and pyrrhotite. The natural remanent magnetization Jn, the volume susceptibility ℵ, the specific magnetization of saturation σso, the Curie temperature Θ, the A.C. demagnetization of natural remanent magnetization, the thermal demagnetization Jn, the temperature dependence of the specific magnetization of saturation, and several other parameters were determined for the individual sets of minerals. Since natural minerals can and do contain various heterogeneous and isomorphic admixtures, their magnetic properties may change depending on the content and type of these admixtures. Therefore, all the investigations of the magnetic properties described in this paper were carried out with extensive sets of minerals, representing various Czechoslovak and world localities. A number of interesting results were obtained from the executed experiments, e.g., the different stability of the natural remanent magnetization of haematite with respect to A.C. demagnetization, the presence and type of heterogeneous inclusions in ilmenite, the phase changes connected with the γ-transition in natural pyrrhotites, etc. The types of distributions of the investigated values of the magnetic properties were also determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01623913
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  • 14
    Electronic Resource
    Electronic Resource
    Magnetic properties of natural Mn-oxides (1975)
    Springer
    Studia geophysica et geodaetica 19 (1975), S. 261-274 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The paper is devoted to the study of the magnetic properties, of the volume magnetic susceptibility in a weak magnetic field, of the specific magnetic susceptibility in a strong magnetic field, of natural remanent magnetization and its stability in A.C. fields, and of the temperature dependence of magnetic susceptibility of natural Mn-oxides. Samples of pyrolusite, polianite, manganite, hausmannite, psilomelan and wad from different localities all over the world were studied; the measured values are statistically treated so that the given values are valid in general. Hausmannite displayed typical values of the magnetic susceptibility, different from the values of the other Mn-oxides. In general, many natural Mn-oxides contain heterogeneous admixtures of Fe-oxides, which are responsible for their ferromagnetic properties. A high degree of magnetic hardness, predetermining the minerals for palaeomagnetic research, was proved with many of the natural Mn-oxides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01614255
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  • 15
    Electronic Resource
    Electronic Resource
    On the techniques of analysing the multi-component magnetization of rocks using the Rocoma magnetometer (1987)
    Springer
    Studia geophysica et geodaetica 31 (1987), S. 176-196 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Description / Table of Contents: Summary The study is devoted to the interpretation procedures and laboratory techniques used in the palaeomagnetic laboratory of Geofyzika, N. C., Brno, Prague Division, in Průhonice near Prague. The newly developed demagnetization system, equipped with a sensitive ROCOMA magnetometer (Rotating Coil Magnetometer), guarantees a magnetic vacuum. Improved laboratory procedures provide for a more accurate analysis of the multi-component magnetization of rocks, qualitatively and quantitatively. The gyromagnetization effect, generated in rocks of particular physical properties when rotated in spinner magnetometers is pointed out, and the suppression of this undesirable effect is discussed. The procedures described were used to determine the palaeomagnetization in rocks which were affected by a number of phases of orogenic activity.
    Notes: Резюме Сmamья nосвященa uнmерnреmaцuонным меmо¶rt;aм u лaборamорным mехнuкaм, nрuменяемым в лaборamорuu naлеомaгнеmuзмa в н. n. Пругонuце околог. Прaгu нaцuонaльного nре¶rt;nрuяmuя Геофuзuкa Брно, зaво¶rt;a Прaгa. Сосmaвленнaя вновь сuсmемa рaзмaгнuчuвaнuя, оснaщеннaя высокочувсmвumельным мaгнumомемром ROCOMA (Rotating Coil Magnetometer), обесnечuвaеm соз¶rt;aнuе мaгнumного вaкуумa. Усовершенсmвовaнные лaборamорные nрuемы nре¶rt;осmaвляюm возможносmь более mочного кaчесmвенного u колuчесmвенного aнaлuзов многокомnоненmного нaмaгнuченuягорных nоро¶rt;. В сmamье обрaщaеmся внuмaнuе нa эффекmгuронaмaгнuчuвaнuя, вознuкaющuŭ в nоро¶rt;aх, облa¶rt;aющuх оnре¶rt;еленнымu фuзuческuмu своŭсmвaмu, во время врaщенuя нa роmaцuонных мaгнumомеmрaх, u нa nо¶rt;aвленuе нежелamельногогuронaмaгнuченuя. Оnuсaнные nрuемы nре¶rt;осmaвuлu возможносmь оnре¶rt;еленuя naлеонaмaгнuченuя nоро¶rt;, nо¶rt;вергшuхся несколькuм фaзaм склa¶rt;чamосmu.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01638203
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  • 16
    Electronic Resource
    Electronic Resource
    An analysis of the palaeomagnetic field (1978)
    Springer
    Studia geophysica et geodaetica 22 (1978), S. 368-389 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The paper is devoted to a critical evaluation of the hypothesis of the prevalent character of the palaeomagnetic field in the course of the whole Phanerozoic. The study ties in with the synthetic processing of all so far published palaeomagnetic data for Eurasia and Africa respecting some of the models ensuing from the concept of plate tectonics. Initial material for testing the dipolar hypothesis was obtained by statistical processing of the palaeomagnetic pole positions and by analyzing the values of the so-called palaeorotation, the palaeoinclination difference and of palaeodivergence. It was shown that, by defining tectonically stable blocks (plates, palaeoplates) within the scope of the Eurasian continent and within the scope of the African continent as a whole, data were obtained bringing evidence of the predominating dipolar character of the mean geomagnetic field for the period from the Quaternary to the Cambrian, with the exception of the Silurian which has not been studied sufficiently. The deviations of the palaeomagnetic directions from the direction of the dipolar field within the scope of the stable blocks have the character of a Gaussian distribution and the standard deviations only amount to a few degrees.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02179279
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  • 17
    Electronic Resource
    Electronic Resource
    Palaeointensity of the geomagnetic field during upper cainozoic derived from palaeo-slags and porcellanites in north Bohemia (1989)
    Springer
    Studia geophysica et geodaetica 33 (1989), S. 338-361 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Description / Table of Contents: 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.
    Notes: Реэюме 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01637689
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  • 18
    Electronic Resource
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    On the detailed magnetostratigraphy of greigite — (Smythite) mineralization, Sokolov Brown-Coal Basin, bohemia (1991)
    Springer
    Studia geophysica et geodaetica 35 (1991), S. 267-284 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary In the Middle Miocene claystones containing fossil micro-organic matter and overlying the brown-coal seams in the “Jiři” quarry of the Sokolov Brown-Coal Basin, a strongly magnetic layer was found and subjected to detailed palaeomagnetic investigations. The principal carrier of magnetism in this bed (called Kocián's bed) is the ferrimagnetic mineralization of greigite or greigitesmythite showing pronounced metastable properties. This mineralization must be treated with caution during laboratory tests aimed at deriving palaeomagnetic directions. In Kocián's bed, about two metres thick, two zones of palaeomagnetic field transition were identified. The high degree of demagnetization achieved by using thermal stepwise procedures and a MAVACS apparatus enabled the origin of the self-reversal of remanence to be defined after heating to 360°C. The process of chemo-remanent magnetization of the authigenic greigite-(smythite) mineralization fossilizing the palaeomagnetic field was relatively fast; the transition of the palaeomagnetic field is recorded in layers not exceeding a thickness of 2 × 10−2 m.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01613973
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  • 19
    Electronic Resource
    Electronic Resource
    Magnetic properties, self-reversal remanence and thermal alteration products of smythite (1993)
    Springer
    Studia geophysica et geodaetica 37 (1993), S. 382-400 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary This study is a follow up of the investigation of some magnetic properties and metastability of greigite in samples obtained from Miocene claystones in the Krušné hory (Erzgebirge) Piedmont basins (Bohemia). Three different methods of upgrading the smythite were applied; the magnetic properties of the concentrates are compared. The thermal conversion of smythite sets in at 200°C while greigite converts at 250°C. The first intermediate products to be formed are iron sulphides, marcasite clearly dominating over pyrite and pyrrhotite. Apart from a Fe3+ sulphate with a composition of Fe2(SO4)3, oxidation of these sulphides gives rise to α-Fe2O3. The result of the subsequent decomposition of the mentioned sulphate is the formation of η-Fe2O3, which retains the sulphate structure. The final product of the thermal decomposition at 800°C is α-Fe2O3. In the smythite concentrate the conversion to Fe3+ sulphate and η-Fe2O3 is about twice as intensive as in greigite. No direct conversion to γ-Fe2O3 was found. During the thermal process self-reversals of remanence were observed, in various samples as many as four reversals in the temperature interval from 340 to 590°C. The occurrences of self-reversals of remanence were only observed at high degrees of thermal demagnetization, of the order of 10−2 down to 10−3 in the temperature interval of sulphide origin (below 400°C), and of the order of 10−4 down to 10−6 in the temperature interval of Fe-oxides origin (above 400°C).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01613584
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  • 20
    Electronic Resource
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    Palaeomagnetism and palaeogeography of Variscan formations of the Bohemian massif: A comparison with other regions in Europe (1995)
    Springer
    Studia geophysica et geodaetica 39 (1995), S. 309-319 
    Details
    ISSN: 1573-1626
    Keywords: European Variscides ; Bohemian Massif ; palaeomagnetism ; palaeogeography ; palaeotectonic rotations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary Statistical evaluation of palaeomagnetic data from the Early Carboniferous to the Middle Triassic rocks in Europe, north of the Alpine tectonic belt, confirmed previously defined palaeotectonic stability of the whole European Plate since the Early Permian. The Trans-European Suture Zone represents a plate boundary, SW of which the Early Variscan and pre-Variscan formations show different degrees of palaeotectonic rotations, predominantly rotations of clockwise sense. A theoretical model simulating the translation and rotation movements was proposed showing that the West European Variscides underwent Hercynian palaeotectonic rotations comparable with the rotations derived for the Alpine tectonic belt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02295824
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