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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 98 (1972), S. 163-172 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The present communication deals with problems that are common to the application of some geophysical methods in arid regions. Typical examples of using geothermic methods, D.C. and A.C. electrical and radiometric methods in the Eastern Desert of Egypt are presented. The conclusions were derived from a great number of measurements and are all associated with the physical properties of rocks on or near the surface under desert conditions.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 62 (1965), S. 129-136 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The present contribution points out certain analogy between magnetic properties of synthetic ferrites and some natural high-temperature minerals. The synthetic ferrites possess crystal structures of the type of spinel, tetra-spinel, rutile, ilmenite, magneto-plumbite, perovskite and garnet. Such structures are known in great numbers of ‘non-magnetic’ minerals in nature. As soon as the elements of the corresponding synthetic ferrite are attached to their lattice it might be expected that a natural model of ferrite will be obtained. Unique palaeomagnetic properties were discovered in cassiterite with Fe-ions attached to its lattice.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 57 (1964), S. 96-102 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The present contribution contains a brief review of palaeomagnetic investigation carried out in Czechoslovak hydrothermal deposits. So far polar wandering has been considered on the basis of palaeomagnetism of lavas and red sediments; to first approximation it agrees with palaeoclimatic data. Since the products of hydrothermal mineralizations have displayed a high stability of the magnetic parameters used in palaeomagnetism, the treatment of a greater amount of statistical material yielded data for deriving the polar wandering path during geological history. By analyzing the curve obtained it is possible to derive some geochronological conclusions concerning the age of the ore-yielding processes in the principal Czechoslovak metallogenic areas. In this way a new dating technique for products of hydrothermal mineralizations is presented based on the study of palaeomagnetic properties. At the same time, these new results are consistent with the geophysical interpretation of the polar wandering curve for Europe.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 69 (1968), S. 158-167 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The present paper deals with the derivation of the intensity of the geomagnetic field in the Plio-Pleistocene, Central Europe. The intensity was derived from the thermo-remanence of porcellanites and palaeo-slags. These rocks represent a common product of intense thermal alteration of loams due to spontaneous combustion of coal seams. Porcellanites and palaeo-slags show outstanding palaeomagnetic properties, their remanent magnetization is of thermo-remanent origin and they were ‘mineralogically stabilized’ under natural conditions in the geological past, during the coal combustion. It was found, that the intensity of the geomagnetic field during the Plio-Pleistocene oscillated about the value of the present-day intensity.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Mineralium deposita 1 (1966), S. 139-147 
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract This paper deals with some problems in the investigation of the magnetic properties of minerals which may be ferromagnetic under specific conditions. The main purpose of this work is to extend the application of the paleomagnetic method to the study of geological processes. The focus of this report is the description of the ferromagnetism of cassiterite with Fe-ions attached to its lattice. The cassiterite samples collected from different localities all over the world were shown to have remarkable paleomagnetic properties. A specific example Krásno — Schönfeld (West Bohemia) points out the possibilities of use of paleomagnetism of cassiterite for dating the cassiterite-wolframite mineralizations as well as their correlation with surrounding ore formations. The study of both the physical properties and specifically the “thermal memory” of the cassiterite provides a basis for a discussion of the possibilities of finding evidence of the influence of thermal transformation in cassiterite ore deposits, respectively evidence of their regenerations.
    Notes: Zusammenfassung Es werden Mineralien untersucht, die unter bestimmten Umständen ferromagnetisch sein können. Hauptziel der Arbeiten war die Erweiterung der Möglichkeiten der paläomagnetischen Methode beim Studium endogener geologischer Prozesse. Vor allem wird der Ferromagnetismus des Kassiterits, der Fe-Ionen an sein Gitter bindet, herausgestellt. An Kassiteritproben von verschiedenen Fundstellen aus der ganzen Welt wurden bemerkenswerte paläomagnetische Eigenschaften nachgewiesen. Am Beispiel Krásno — Schönfeld (Westböhmen) wird auf die Möglichkeit der Ausnutzung des Paläomagnetismus des Kassiterits zur Datierung der Kassiterit-Wolframit-Mineralisation sowie zu ihrer Korrelation mit der übrigen Vererzung hingewiesen. Das Studium der physikalischen Eigenschaften und insbes. des „Wärmegedächtnisses” des Kassiterits erlaubt die Diskussion der Möglichkeit einer Unterscheidung des Einflusses der thermischen Umwandlung der Kassiteritlagerstätten bzw. ihrer Regeneration.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Mineralium deposita 3 (1968), S. 155-161 
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung Die Arbeit behandelt die paläomagnetische Chronologie als statistische Methode im Hinblick auf die Erforschung von Lagerstätten. Mit der statistischen Methode von R. Fisher berechnet der Verfasser die mittleren Lagen der virtuellen Pole vom Quartär bis zum Devon; zur Berechnung wurden die paläomagnetischen Daten ausgenutzt, die für den eurasischen Erdteil bis 1966 veröffentlicht wurden. Von den mittleren Pollagen wurde die Divergenz der paläomagnetischen Richtungen für Mitteleuropa abgeleitet und ihr Wert wurde als Zeitfunktion graphisch dargestellt. Auf diese Weise wurde durch eine objektive Methode eine chronologische Vergleichskala ermittelt, die sich auf ein umfangreiches statistisches Material vom gesamten eurasischen Erdteil stützt. — Die paläomagnetische Erforschung der biostratigraphisch datierten Gesteine und Lagerstätten von Mineralrohstoffen auf dem Gebiet des Böhmischen Massivs ist so weit fortgeschritten, daß es möglich ist, die tektonische Entwicklung der Lagerstätten mit Bezug auf die tektonische Entwicklung verschiedener Becken, Gräben, ganzer Gesteinsblöcke usw. zu untersuchen. Mit Rücksicht auf die tektonischen Deformationen, auf den natürlichen Streubereich der paläomagnetischen Richtungen und auf den Genauigkeitsgrad der Ableitung der mittleren Werte der paläomagnetischen Divergenz besteht die Möglichkeit, bei der paläomagnetischen Datierung die Genauigkeit im Bereich von einigen zehn Millionen Jahren zu erreichen. In speziellen Fällen ist es zweckmäßig, auch andere Parameter zum Erreichen eines höheren Genauigkeitsgrades zu benützen.
    Notes: Abstract The paper deals with palaeomagnetic chronology as a statistical method. Using R. Fisher's statistics, the author derived the mean virtual pole positions, beginning with the Quaternary up to the Devonian, from data published in different countries and laboratories for the Eurasian continent up to the end of the year of 1966. From the mean pole positions the divergence of palaeomagnetic directions was computed and its value for Central Europe versus time was plotted. — Palaeomagnetic research into biostratigraphically dated rocks and mineral deposits in the Bohemian Massif has reached a stage, where it is possible to study the tectonic development of mineral deposits in relation to tectonic development of various basins, grabens and rock blocks. With respect to tectonic deformations, to the natural scattering of palaeomagnetic directions and to the accuracy in deriving the mean values of palaeomagnetic divergence, it is possible to achieve an accuracy in palaeomagnetic dating within the limits of a geological period, i.e. some tens of millions of years. Some other parameters may be used in special instances to reach a higher degree of accuracy.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Mineralium deposita 3 (1968), S. 242-248 
    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.
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 365-366 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The fundamental condition for a correct age interpretation of the products of hydrothermal mineralization is that they reproduce the primary direction of the remanent magnetization. It is thus necessary to eliminate the influence of post-mineralization tectonics4 and to prove the magnetic stability ...
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 697-699 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The intensity of the geomagnetic field in Central Europe during the Permo-Carboniferous, Permian and Plio-Pleistocene did not differ appreciably from the present day ...
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 225 (1970), S. 173-175 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have concentrated our efforts mostly on specimens which are known to be stable with regard to laboratory heating in the hope that the magnetic phase or phases in these minerals will have well denned chemical compositions. In Table 1 we show the geographical origin of the samples and the chemical ...
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