EGU21-4232
https://doi.org/10.5194/egusphere-egu21-4232
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Reuse of medieval bricks as important limitation for construction of geomagnetic secular variation curves based on archeomagnetic studies of brick buildings in Poland. 

Jerzy Nawrocki1,2, Karol Standzikowski2, Tomasz Werner3, Maria Łanczont2, Jan Gancarski4, and Zdzisław Gil4
Jerzy Nawrocki et al.
  • 1Polish Geological Institute - NRI, Departament of Mineral Resources, Poland (jerzy.nawrocki@pgi.gov.pl)
  • 2Maria Curie Skłodowska University, Faculty of Earth Sciences and Spatial Management, Lublin (jerzy.nawrocki@poczta.umcs.lublin.pl; karol.standzikowski@poczta.umcs.lublin.pl; lanczont@poczta.umcs.lublin.pl)
  • 3Institute of Geopyscis, Polish Academy of Sciences, Warszawa (twerner@igf.edu.pl)
  • 4Subcarpathian Museum in Krosno, Krosno (dyrekcja@muzeum.krosno.pl; muzeum@muzeum,krosno.pl)

The bricks can be one of the best material for archeomagnetic studies. Their backing technique (i.e. horizontal location in the furnace) allow to determine also the value of inclination of geomagnetic field.  However, reuse of older bricks for the construction of newer objects can limit the utility of this material in archeomagnetic studies. A set of the brick samples from 26 historical buildings in SE Poland was taken for archeomagnetic investigations. As a result of this study, the secular variations of palaeointensity and inclination of the geomagnetic field from 1200 to 1800 AD were defined for this part of Poland. The paleointensity of geomagnetic field  was determined using the IZZI-Thellier-Thellier protocol. The course of the new regional palaeosecular curves is approximately the same as so far obtained in other parts of Europe. Data obtained from four brick buildings, however, do not fit substantially to the reference European curves. The remarkable difference  is a rapid and deeper drop of inclination and significantly higher than expected values of  palaeointensity. These features indicate that bricks used for the construction of these buildings (dated on XVI – XVII centuries) were taken from older brick constructions, most probably from the Gothic time (XIII/XIV c.). We compared our data with the earlier data obtained from brick buildings in N Poland. The regional archeomagnetic curves calculated for these two regions of Poland are completely different in their segments as old as the first half of the 18th century. This fact could be explained by the reuse of medieval bricks during the construction of studied objects from N Poland (dated on the first half of the 18th century) and applied for the construction of reference curve or by later secondary heating of original bricks.

This research was supported by  the National Science Centre of Poland (project no: UMO-2016/23/B/ST10/0129).

How to cite: Nawrocki, J., Standzikowski, K., Werner, T., Łanczont, M., Gancarski, J., and Gil, Z.: Reuse of medieval bricks as important limitation for construction of geomagnetic secular variation curves based on archeomagnetic studies of brick buildings in Poland. , EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-4232, https://doi.org/10.5194/egusphere-egu21-4232, 2021.

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