PALEOMAGNETISM

In our palaeomagnetic laboratory, we carry out studies of direction and intensity of the remanent magnetization, present in all rock types. They also include measurements of magnetic susceptibility and its directional properties (anisotropy of magnetic susceptibility - AMS), as well as general studies of magnetic properties of rocks: identification of mineral carriers of magnetization and magnetic susceptibility.

In the classical approach, the objective of the palaeomagnetic method is to determine directions of the ancient geomagnetic field recorded in rocks, and to date these directions. Present-day magnetization of rocks is usually the resultant of magnetization vectors of different ages, which can be identified using the procedure of demagnetization by alternating magnetic field or temperature. Valuable information is provided not only by original but also secondary components of magnetization. Palaeomagnetism is one of the geophysical specialities that are very closely related to geology, and its numerous applications are used in stratigraphic, tectonic and palaeoenvironmental studies (especially magnetic susceptibility studies).

WE OFFER

Palaeogeographic reconstructions of the position of continents and smaller tectonic units in various Phanerozoic epochs
Magnetostratigraphic schemes and correlations (based on the amount of polarity changes) of rocks devoid of guide fossils
Reconstruction of palaeoenvironmental conditions (including mainly palaeoclimatic) on the basis of variations in some petromagnetic parameters
Dating of diagenetic events based on secondary magnetization components
Identification of the orientation of drill cores from modern viscous remanent magnetization (VRM)
Determination of magnetic susceptibility and remanent magnetization of rocks to interpret magnetic maps
Research of anisotropy of magnetic properties of rocks and its tectonic interpretation

EQUIPMENT AND SOFTWARE

JR-6 and JR-5 – Brno AGICO (Czech Republic) spinner magnetometers
MMTD1 –Thermal Demagnetizer for rock sample analysis from Aughton Magnetic Measurements Ltd (UK)
KLY-2 – Brno AGICO (Czech Republic) Kappabridge for determination of anisotropy of magnetic susceptibility of rocks
MMLFC – a Helmholtz Chamber to eliminate the effect of magnetic field from Aughton Magnetic Measurements Ltd (UK)
Aughton Magnetic Measurements (UK) Pulse Magnetizer
Molspin pARM (UK) Demagnetizer – equipment used for demagnetization of rock samples by alternating magnetic field, with a special device for acquisition of anhysteretic remanent magnetization
Bartington MS2 System – for measuring magnetic susceptibility of soils and rocks in both the field and laboratory. Equipped with the MS2 meter and the MS2B, MS2D, MS2W sensors
MS2 Meter – a meter with effective resolution of 2 x 10–6 SI (2 x 10–7 CGS) and a 4-digit display, SI or CGS unit switch
MS2B – a laboratory sensor. This dual frequency facility is used for mass or volume specific susceptibility measurements performed on up to 25.4 mm diameter cubes or cores, and on 10 ml or 20 ml samples. A hand-driven mechanism is provided to facilitate the insertion of the sample into the sensor cavity and to ensure it is perfectly centered. It also enables measurements of the anisotropy of susceptibility
MS2D – a field search loop, 185 mm in diameter, used for surface measurements. Its measuring depth range is up to 100 mm
MS2W – a sensor which is an integral part of a Susceptibility/Temperature System, used for thermal laboratory measurements of magnetic susceptibility on 2.5 ml samples over the temperature range of -200°C to +850ºC.
GEOLABSOFT software, collects data and plots a graph of susceptibility versus temperature
SM-30 – magnetic susceptibility meter; measures susceptibility without collecting samples, directly at the surface in an exposure or on a drill core
Magnetic Measurements Drill MMPRD+ – is a portable drill set, weighing 5.4 kg, for drilling 20–32 mm cores, with a 15.9 cc motor, 2 speed gearbox and water-lubricated drill bits
RemaSoft PALMAG computer program for analysis of magnetization components
GMAP computer program for palaeogeographic reconstructions
ANISO Package software for analysis of the magnetic susceptibility anisotropy

CONTACT

Warsaw

Jerzy Nawrocki, Prof.
Tel. +48 22 45 92 400
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Jacek Grabowski, Dr
Climate and Environment Change Program
Tel. +48 22 45 92 350, +48 22 45 92 559
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Olga Rosowiecka, Dr Eng.
Energy Security Program
Tel. +48 22 45 92 535
Mobile 607 702 272
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Katarzyna Sobień, MSc
Energy Security Program
Tel. +48 22 45 92 274, +48 22 45 92 559
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