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  • 1
    Electronic Resource
    Electronic Resource
    A technique for the measurement of thermal changes of magnetic susceptibility of weakly magnetic rocks by the CS-2 apparatus and KLY-2 Kappabridge (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 118 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Techniques for the correction of the effect of the furnace signal on the data measured in the investigation of thermal changes of magnetic susceptibility of weakly magnetic rocks using the CS-2 apparatus and KLY-2 Kappabridge are described. A new method is developed for separating the ferromagnetic and paramagnetic room temperature susceptibility components even for the case in which new magnetite forms during heating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb03987.x
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic anisotropy of rocks and its application in geology and geophysics (1982)
    Springer
    Surveys in geophysics 5 (1982), S. 37-82 
    Details
    ISSN: 1573-0956
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Magnetic anisotropy in sedimentary rocks is controlled by the processes of deposition and compaction, in volcanic rocks by the lava flow and in metamorphic and plutonic rocks by ductile deformation and mimetic crystallization. In massive ore it is due to processes associated with emplacement and consolidation of an ore body as well as to ductile deformation. Hence, it can be used as a tool of structural analysis for almost all rock types. Morcover, it can influence considerably the orientation of the remanent magnetization vector as well as the configuration of a magnetic anomaly over a magnetized body. For these reasons it should be investigated in palaeomagnetism and applied geophysics as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01450244
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of quartz on the magnetic anisotropy of quartzite (1986)
    Springer
    Studia geophysica et geodaetica 30 (1986), S. 39-45 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Description / Table of Contents: Summary The magnetic susceptibility of quartz single crystals is diamagnetic (−14×10 −6 in SI units) and exhibits only very small anisotropy (mostly less than 1%); thus the susceptibility of the quartz matrix in quartzite can be regarded as virtually isotropic. Owing to the influence of the negative and isotropic susceptibility of the quartz matrix, the degree of anisotropy of quartzite, as inferred from model calculations, is higher than that of the ferrimagnetic fraction. This influence is very strong if the mean susceptibility of quartzite is in the vicinity of zero.
    Notes: Резюме Монокрuсmaллы квaрцa являюmся ¶rt;uaмaгнumнымu (восnрuuмчuвосmь−14 × 10 −6 в сuсmеме СИ) u оченъ мaло aнuзоmроnuынмu (не более1%). Эmо знaчum, чmо восnрuuмчuвосmь основноŭ квaрцевоŭ мaссы в квaрцumaх можеm быmь nрuняma nрaкmuческu uсоmроnноŭ. Из мamемamuческого мо¶rt;елuровaнuя сле¶rt;уеm, чmо nо nрuчuне влuянuя оmрuцamельноŭ u uзоmроnноŭ восnрuuмчuвосmu основноŭ квaрцевоŭ мaссы сmеnень aнuзоmроnносmu квaрцuma выше, чем сmеnень aнuзоmроnносmu феромaгнumноŭ фрaкцuu. Эmо влuянuе нauбольее mог¶rt;a, ког¶rt;a сре¶rt;нaя восnрuuмчuвосmь блuзкa нулю.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01630853
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  • 4
    Electronic Resource
    Electronic Resource
    On the detection of weak strain parallel to the bedding by magnetic anisotropy: A mathematical model study (1990)
    Springer
    Studia geophysica et geodaetica 34 (1990), S. 327-341 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Description / Table of Contents: Реэюме Пруво¶rt;umся nяmь мamемamuческuх мо¶rt;елеŭ суnерnозuцuu ¶rt;еформaцuонноŭ мa¶rt;нumноŭ mексmуры на осa¶rt;очноŭ мa¶rt;нumноŭ mексmуре. Мо¶rt;елu ире¶rt;сmвaлены в рaзных комбuнaцuях чuсmо¶rt;о с¶rt;вu¶rt;а ц иросmо¶rt;о с¶rt;вu¶rt;а. Дua¶rt;раaммы вaрuaцuŭ в ¶rt;лaвных naрaмеmрaх мa¶rt;нumноŭ aнuзоmроnuu с ¶rt;еформaцuеŭ мо¶rt;уm nомочь nрu рaсnознaвaнuu слaбых nлaсmuчных ¶rt;еформaцŭŭ в осa¶rt;очных nоро¶rt;aх.
    Notes: Summary Five mathematical models of the superposition of deformational magnetic fabric on sedimentary magnetic fabric are presented. These models are represented by various combinations of pure shear and simple shear. The diagrams of the variations in the main magnetic anisotropy parameters with strain can help in recognizing weak ductile deformation in sedimentary rocks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02316953
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  • 5
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    Phyllosilicate preferred orientation as a control of magnetic fabric: evidence from neutron texture goniometry and low and high-field magnetic anisotropy (SE Rhenohercynian Zone of Bohemian Massif) (2007)
    In:  Geological Society Special Publication 238: 361-380.
    Details
    Publication Date: 2007-10-08
    Description: The low- and high-field magnetic anisotropy (AMS, HFA) of the Rhenohercynian mudstones and greywackes is compared to the theoretical anisotropy calculated from neutron texture goniometry measurements. The magnetic anisotropy is predominantly carried by the paramagnetic phyllosilicates in the form of chlorite/mica stacks and the ferromagnetic contribution is insignificant. The respective principal directions of the theoretical anisotropy and the AMS and HFA are sub-parallel; magnetic foliation reflects the orientation of the maximal concentration of phyllosilicate basal planes, magnetic lineation is subparallel to the intersection axis of those planes. For the purpose of quantitative comparison, the infrequently used standard deviatoric susceptibility as a measure of the HFA degree is employed. A very good linear correlation of the degree of theoretical anisotropy and the measured AMS and HFA is found. The prolate and oblate shapes of the respective fabric ellipsoids are reasonably well correlated. Neutron texture goniometry justifies the use of the conventional magnetic anisotropy technique for the assessment of the mineral fabric of studied rocks. When compared with other works relating the magnetic anisotropy to the mineral preferred orientation (examined by e.g. U-stage or X-ray texture goniometry) neutron texture goniometry seems to be a preferable and very precise method fabric analysis.
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  • 6
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    Determination of the orientation of magnetic minerals from the anisotropy of magnetic susceptibility (2007)
    In:  Geological Society Special Publication 238: 9-20.
    Details
    Publication Date: 2007-10-08
    Description: The anisotropy of magnetic susceptibility (AMS) of rocks is controlled by preferentially oriented magnetic mineral grains that carry AMS and, therefore, it contains information about both the grain susceptibilities and the grain orientations. Under certain conditions, information about the grain orientations can be deduced from the AMS. For a multigrain system composed of identical grains that are magnetically uniaxial (for the grain principal susceptibilities it holds that K1 > K2 = K3, or K1 = K2 > K3), an exact relationship exists between the AMS and the orientation tensor. We investigate the extent to which the theoretical relationships can be used when grains are generally triaxial. The parallelism of the principal directions of the susceptibility tensor and those of the orientation tensor are well preserved in all basic grain configurations. If grain leading axes have polar or girdle distributions and the two other axes have balanced distributions (similar orientation tensors), the parameters of intensity I and shape T based on the eigenvalues of the orientation tensor are well estimated. For unbalanced distributions, formulas are found for possible errors of I and T estimates.
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  • 7
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    Problems in interpreting AMS parameters in diamagnetic rocks (2007)
    In:  Geological Society Special Publication 238: 49-59.
    Details
    Publication Date: 2007-10-08
    Description: The AMS parameters widely used to characterize the magnetic fabric of rocks (L, F, P, T) are not directly applicable to diamagnetic rocks. Namely, there are two principal methods of their definition: (1) from the signed principal susceptibilities or (2) from the absolute values of the principal susceptibilities. The first method results in L, F and P values less than one in contrast to materials whose susceptibility arises from paramagnetism and/or ferromagnetism sensu lato, where they are greater than one by definition. The ratio parameters decrease with increasing intensity of alignment of the magnetic minerals; the calculated shape parameters are, however, correct. The second method gives L, F and P values greater than one; they increase with increasing preferred orientation, however the ellipsoid shape parameters are inverse. The development of AMS parameters with increasing preferred orientation is modelled mathematically for quartzite/evaporite (para- and/or ferromagnetic AMS superimposed on the isotropic diamagnetic matrix) and for marble/limestone (preferred orientation of calcite in a rock). A rational set of AMS parameters is then recommended.
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  • 8
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    Anisotropy of magnetic susceptibility of rocks measured in variable weak magnetic fields using the KLY-4S Kappabridge (2007)
    In:  Geological Society Special Publication 238: 69-76.
    Details
    Publication Date: 2007-10-08
    Description: The theory of the anisotropy of magnetic susceptibility assumes a linear relationship between magnetization and magnetizing field, resulting in field-independent susceptibility. This relationship is valid in diamagnetic and paramagnetic minerals by definition, and also in magnetite in the fields used in common AMS meters. Pyrrhotite, hematite and titanomagnetite may show field variation of susceptibility in the same fields and therefore in principle the linear theory is incorrect for calculating the AMS. Fortunately, the linear theory nevertheless provides accurate determination of the orientations of the principal susceptibilities and of the AMS ellipsoid shape. It gives rise to inaccurate determination of the degree of AMS. Simple techniques are suggested to overcome this problem.
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  • 9
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    Anisotropy of susceptibility in rocks which are magnetically nonlinear even in low fields (2018)
    Oxford University Press
    Details
    Publication Date: 2018-03-06
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Royal Astronomical Society.
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  • 10
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    Anisotropy of out-of-phase magnetic susceptibility as a potential tool for distinguishing geologically and physically controlled inverse magnetic fabrics in volcanic dykes (2020)
    Elsevier
    Details
    Publication Date: 2020-10-01
    Print ISSN: 0031-9201
    Electronic ISSN: 1872-7395
    Topics: Geosciences , Physics
    Published by Elsevier
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