Magnetic anomaly map for Northern, Western, and Eastern Europe^*

Abstract

All of the available data describing the Earth’s magnetic field in Northern, Western, and Eastern Europe (c. 3 × 106 data points) are compiled and presented at a scale of 1:20 400 000. The compilation meets two requirements (i) that the total field intensity anomalies reflect a survey acquired at an altitude of 3000 m above m.s.l. and during the same epoch, 1980.0; and (ii) that the anomalies are residuals after subtracting the common reference field DGRF1980. As the data span many epochs, geomagnetic data recorded at observatories and repeat stations were used to determine the best model for estimating the secular variation in all data up to 1980. This yielded magnetic anomalies with wavelengths up to the order of 2000 km. The precision of the resultant anomalies (amplitudes about – 1700 nT to 8000 nT) differ between ± 10 nT in Central Europe and ± 20 nT in the outer parts of the compilation. The resultant anomaly map contains a wealth of information to geoscientists studying global tectonic processes and the deep crustal composition of major continental crusts. It clearly shows the different anomaly patterns between the Palaeozoic and Precambrian crusts of Central and Eastern Europe. These anomalies are interpreted as lateral changes of magnetization in a horizontal plate. A comparison between the low‐level compilation and maps derived from the MAGSAT satellite at about 360 km altitude allows the description of the two different crust types in Europe.

Basement structure of the Paleozoic Platform in Poland

“…Po ten tial field ev i dence in cludes grav ity and mag netic data (Królikowski and Petecki, 1995;Wonik et al, 2001;Banka et al, 2002;Petecki, 2008). Of par tic u lar im por tance are the mag netic anom aly maps ac cu rately re pro duc ing the struc ture and compo si tion of the crys tal line base ment un der the sed i men tary cover (Clark, 1997).…”

“…5). The west ern ex ten sion of this zone turns to the SW, pass ing into the Mid-Ger man Crys tal line High (Wonik et al, 2001;Ga briel et al, 2011). The lat ter struc ture is in ter preted as the NW mar gin of the Saxothuringian Zone of the Cen tral Eu ropean Variscides (Franke, 2000;Kro ner et al, 2008) cor respond ing to the Rheic Su ture be tween the Saxothuringian and Rhenohercynian belts.…”

A new magnetic anomaly map of Poland and its contribution to the recognition of crystalline basement rocks

“…It should be noted that the west ern ex ten sion of CWPd in east ern Ger many is also as so ci ated with pre dom i nantly neg a tive mag netic anoma lies (Wonik et al, 2001;Ga briel et al, 2011). CWPd is char acter ized by the pres ence of a thick low-ve loc ity up per crustal layer ) that could be partly re spon si ble for the gen er ally low mag netic anom aly val ues.…”

“…These anom a lies are re lated to the sub-Perm ian Wol sztyn-Leszno High im aged as a deep crustal struc ture by the wide-an gle re flec tion and re frac tion (WARR) P4 seis mic pro file (Grad et al, 2003). The west ern ex ten sion of the zone passes into the Mid-Ger man Crys tal line High (Wonik et al, 2001;Ga briel et al, 2011). The north ern bound ary of this mag netic re gion is ex pressed by the SE-trending mag netic gra di ent zone de fined as the S³ubice-Leszno mag netic lin eament ( Fig.…”

“…Af ter the base-sta tion cor rec tion and ad just ment to the 1982.5 geo magnetic ep och, the to tal-field mag netic anom aly DT was ob tained by sub tract ing the mag ni tude of an ap pro pri ate DGRF 1982.5 re gional field from the to tal field mea sure ment to ob tain the crustal anom aly field. No ta bly, the DGRF 1980 model was se - (Wonik et al, 2001), which was re cently used by Ga briel et al (2011) dur ing com pi la tion of the mag netic anom aly map of Ger many. Fi nally, the data were gridded at 1 km spac ing us ing a min i mum cur vature method.…”