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  • 1
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    Bohrlochmessungen nach der Methode der Induzierten Polarisation (IP) (1979)
    In:  Geologisches Jahrbuch Reihe E Geophysik - geophysics, Veldhoven, Am. Inst. of Physics, vol. 79, no. E16, pp. 19-38, pp. 2141, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Borehole geophys. ; Polarization ; Geoelectrics ; Electromagnetic methods/phenomena ; Applied geophysics
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Fractal evaluation of induced polarization logs in the KTB-Oberpfalz HB (1996)
    In:  Geologisches Jahrbuch Reihe E Geophysik - geophysics, Bonn, 4, vol. 26, no. E54, pp. 3-27, pp. B05318, (ISSN: 1340-4202)
    Details
    Publication Date: 1996
    Keywords: FractureT ; Borehole geophys. ; scientific drilling ; Data analysis / ~ processing ; Physical properties of rocks
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Geophysik an Altlasten (1991)
    Springer
    In:  Berlin, Springer, vol. 4, no. ALEX(01)-FR-77-01, AFTAC Contract F08606-76-C-0025, pp. 329, (ISBN 0-89871-507-5)
    Details
    Publication Date: 1991
    Description: Abschnitt 2.6 Bohrlochgeophysik, 10 S.
    Keywords: Engineering geophys. ; Textbook of geophysics ; Geoelectrics ; Seismics (controlled source seismology) ; Gravimetry, Gravitation ; RADAR ; Borehole geophys.
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Geothermische und geologische Vorerkundung der Tiefbohrlokationen Oberpfalz und Schwarzwald, Teilgebiet Bohrlochgeophysik (1986)
    NLfB
    In:  BMFT Zwischenbericht RG 8041/2, Hannover, NLfB, vol. 10, no. UCID-20689, pp. 34, 35, (ISBN 0 08 042822 3)
    Details
    Publication Date: 1986
    Keywords: Geothermics ; Geol. aspects ; Borehole geophys. ; ERYBACKI
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
    Electronic Resource
    Electronic Resource
    GEOPHYSICAL CATEGORIZATION OF THE PRECAMBRIAN IN SOUTH INDIA (1972)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 20 (1972), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The ground follow-up of a magnetic and radiometric air survey had to cope with the usual dilemma to check a great number of anomalies within a short time. A limited aggregate of magnetic anomalies, expected to correspond to magnetite quartzites was statistically selected for ground identification by this method: the ratios length/width times amplitude were listed for all coherent contours and the calculation of the standard deviation per unit area resulted in different key-numbers for a new lithological “Salem Unit” and for the charnockitic or gneissic environment. The ground work thus directed and reduced by 85% yielded a substantial potential of iron ore. This was supported by by abundant determinations of the magnetic susceptibilities, confirming the sources of anomalies and revealing the amenabilities of iron ores for the magnetic separation process.The lines of truncation of anomalies were found to represent a system of local and regional faults and shear zones, which segregated the area into different tectonic blocks. These sutures have also provided the ways of intrusion for alkaline and basic magmae in the style of a “Rift” structure, housing several carbonatites and impregnations of metal sulphides.The airborne radiometrics obtained many uranium indications by gamma ray spectrometry. However, they led only to disseminated uranium-silicates, associated with syenites, granites and pegmatites, each emanating a characteristic photon energy spectrum. But in general the radiation of thorium prevails, marking northern Madras as a “Thorium Province”.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1972.tb00636.x
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    EXAMPLES OF ELECTROMAGNETIC PROSPECTING FOR KARST AND FAULT SYSTEMS (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 35 (1987), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Electromagnetic (EM) surveys using the horizontal coplanar loop (‘Slingram’) geometry have been successful in the location of karst aquifer systems in limestone areas of Germany and the Mediterranean. In spite of the rapid changes in shape and resistivity of karst pipes, correlations of significant EM minima can be made by reference to the main structural directions. The EM results have often been verified by drilling. EM prospecting need not be confined to limestone areas. It can be used on all hard rocks where faulting has created vertical zones with a resistivity contrast to the undisturbed rock.EM siting of wells has proved successful in water-supply schemes for several places. This method is now being applied as a routine, fast and low-cost procedure to tap ground-water resources in hard-rock areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1987.tb00838.x
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  • 7
    Electronic Resource
    Electronic Resource
    RELATIONS OF IP DECAY-CURVE STATISTICS AND GEOLOGY (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 29 (1981), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Six thousand three hundred IP measurements made in central and southern Germany have been statistically evaluated. Shapes of IP decay curves obtained in the course of routine prospecting for sulfides were characterized in the following way: three chargeabilities were recorded during the 2 s current-off time. By dividing the last by the first chargeability an “IP decay coefficient’ was calculated and statistically evaluated by means of histograms. When the histograms were compared with the statistics of apparent resistivity and chargeability, no relationship could be detected. Therefore, the histograms of M3/M1 values represent a characteristic property of distinct areas with certain geological features, mineral assemblage and tectonics. Weathering does not alter this geophysical “fingerprint”, which depends solely on geology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1981.tb00406.x
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  • 8
    Electronic Resource
    Electronic Resource
    COMPATIBILITY OF EM AND IP SURVEYS (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 22 (1974), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Methods and typical case histories of EM and IP surveys are compared in order to check their compatibility for the investigation of large areas for base metal sulphides. It is demonstrated that the fast, low cost EM may miss sulphide concentrations which cause no reduction of apparent resistivity, or which act like horizontal slabs, where EM anomalies occur marginally. In such cases only IP can recognize the whole extent of the mineralization. The misleading role of graphite exists for both methods.The conclusion is that EM remains the only economical method to survey whole ore districts, but that the shortcomings should always be taken into account in the interpretation. They can be overcome by employing geological, geochemical or other geophysical indicators in selecting promising targets for follow-up IP. Even if less than 20% of the area is covered by the expensive IP, there is a fair chance that all sulphide bearing rocks will be found. Therefore, the question is not whether to apply EM or IP methods, but how to combine them best.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1974.tb00118.x
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  • 9
    Electronic Resource
    Electronic Resource
    Verhältnis von Faltentektonik und Metamorphose alter Eisenerzlager zu ihrer Eigenmagnetisierung (1962)
    Springer
    International journal of earth sciences 51 (1962), S. 450-456 
    Details
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Zusammenfassung Bei geomagnetischen Untersuchungsarbeiten an silurischen und algonkischen Eisenerzlagerstätten in Nordwest-Spanien und in Oberägypten wurden regional einheitlich ausgerichtete remanente Magnetisierungen festgestellt. Die Eisenerze sind sedimentären Ursprungs. Ihre Faltentektonik und der wechselnde Grad der Metamorphose weisen keine Beziehungen zu den remanenten Magnetisierungsrichtungen auf. Es wird deshalb angenommen, daß diese Eigenmagnetisierungen nach der Faltung auf dem Wege der Thermoremanenz bei der Intrusion benachbarter Granitmassive entstanden sind. Die Inklinationen der remanenten Magnetisierungen weichen nach ersten orientierenden Meßergebnissen in beiden Untersuchungsgebieten nur unwesentlich von der rezenten Inklination des Erdfeldes ab. Die Frage, ob hier Erdfeldrichtungen der geologischen Vergangenheit überliefert worden sind, kann auf Grund der bisher durchgeführten physikalischen Untersuchungen noch nicht endgültig beantwortet werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01820012
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  • 10
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    EXAMPLES OF ELECTROMAGNETIC PROSPECTING FOR KARST AND FAULT SYSTEMS* (1987)
    Wiley
    Details
    Publication Date: 1987-06-01
    Print ISSN: 0016-8025
    Electronic ISSN: 1365-2478
    Topics: Geosciences , Physics
    Published by Wiley
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    PAPER CURRENT
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