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A New Era of the Paleomagnetic Research in the Pre-Cenozoic of the Central Western Carpathians: Concepts, First Results and Ongoing Studies

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A New Era of the Paleomagnetic Research in the Pre-Cenozoic of the Central Western Carpathians: Concepts, First Results and Ongoing Studies GEOLOGICA CARPATHICA 70, SMOLENICE, October 9–11, 2019 GEOLOGICA CARPATHICA 70, SMOLENICE, October 9–11, 2019 A new era of the paleomagnetic research in the pre-Cenozoic of the Central Western Carpathians: Concepts, first results and ongoing studies EMŐ MÁRTON1, DUŠAN PLAŠIENKA2, JOZEF MADZIN3, JACEK GRABOWSKI4, JANA BUČOVÁ3,5, ROMAN AUBRECHT2,3 and MARIÁN PUTIŠ6 1Mining and Geological Survey of Hungary, Paleomagnetic Laboratory, Columbus 17-23, H-1145 Budapest, Hungary; [email protected] 2Comenius University, Faculty of Natural Sciences, Department of Geology and Paleontology, Ilkovičova 6, 842 15 Bratislava, Slovakia; [email protected] 3Slovak Academy of Sciences, Earth Science Institute, Ďumbierska 1, 974 11, Banská Bystrica, Slovakia; [email protected] 4Polish Geological Institute — National Research Institute, Paleomagnetic Laboratory, Rakowiecka 4, 00-975 Warsaw, Poland; [email protected] 5DPP Žilina Ltd, Legionárska 8203, 010 01 Žilina, Slovakia; [email protected] 6Comenius University, Faculty of Natural Sciences, Department of Mineralogy and Petrology, Ilkovičova 6, 842 15 Bratislava, Slovakia; [email protected] Abstract: As a result of the critical revision of pre-Cenozoic paleomagnetic data from the Central Western Carpathians a team of Slovak, Hungarian and Polish researchers agreed to start systematic paleomagnetic investi- gations of the three nappe systems of this area. The new studies would improve the previous ones by using up-to date field, laboratory and statistical methods, as well as focus on formations which are widespread in the respective nappe units. The research started in the Hronic Unit, which is the topmost one, therefore less exposed to re-heating than the Fatric or Tatric nappe stacks. The so far obtained results suggest that during the Permian, the Hronicum was in near equatorial position in the northern hemisphere and at some distance from the European continent. Concerning the studied Triassic carbonates we conclude that they were remagnetized during the Late Cretaceous, basically before or in early stage of the deformation and transportation of the nappe unit. The Hronicum must have rotated about 35° in the CW sense after the Permian during a so far non-constrained period. A second, even larger (about 95°, taking into account the 60°CCW rotation measured on the Central Carpathian Paleogene flysch) general CW rotation can be connected to the closing of the Penninic Ocean. The ongoing studies in the Hronicum would aim at testing the oroclinal bending model by obtaining a robust data set for the area W of the Nízke Tatry Mts, on one hand, and start the systematic research on the Fatricum and Tatricum. Introduction • Incomplete laboratory analysis of the natural rema- nent magnetizations (this aspect will be explained in In a review paper Márton et al. (2015) compiled a paleo- the next chapter) magnetic data base for the Western Carpathians. The tabu- • “Spotlike” distribution of the paleomagnetic data, in lated data for the Central Western Carpathians were pub- time and even more in geographical sense. lished between the 1970s and 2010 and are of very different quality. The typical problems, mostly handi- capping the older results are: The concepts of the “new era” • The often poor documentation (e.g. for the studied localities neither the local tectonic positions nor the Of the nappe systems of the Central Western Car- paleomagnetic directions before tectonic corrections pathians, the uppermost one, and least affected by re- have been published). Thus the acquisition of the heating during nappe stacking (therefore most likely to remanence in relation to the geological age of the rock preserve original magnetization) is the Hronic Unit. For cannot be checked. this reason, a team of Slovak, Hungarian and Polish • Sometimes oriented hand samples were collected in researchers decided to start the systematic study on the field from which several specimens were drilled in the two most widespread age groups of the Hronicum, the laboratory. This method does not guarantee that the Permian red beds and igneous rocks and the Triassic the best material is sampled. Moreover, it introduces carbonates. The deeper buried rocks of the Fatricum and a systematic error in the orientation of the cores by Tatricum would be subjects of the next stage of our study. transferring the nearly always present uncertainity of It was also agreed that the field and laboratory methods the orientation of a hand sample. of the paleomagnetic processing should be harmonized. 33 GEOLOGICA CARPATHICA 70, SMOLENICE, October 9–11, 2019 GEOLOGICA CARPATHICA 70, SMOLENICE, October 9–11, 2019 Concerning field methods, the samples should be drilled the respective demagnetization method is interpreted as and oriented in situ in all cases with magnetic compass. the more ancient. Based on the experiments with the In special conditions, like strong susceptibility and/or selected pilot specimens, the rest of the collection from remanence of some igneous rocks, in the vicinity of high the same group is demagnetized with either AF or ther- power lines or in outcrops protected by metal nets, mal method. orientation with sun compass is also necessary. It goes The paleomagnetic direction for each locality is com- without saying that the sampled object should be devoid puted from the more resistant (or the only) magnetic of any sign of recent or ancient slumping. component using standard statistical methods in two In the laboratory, the remanent magnetization (NRM) co-ordinate systems. One is the geographical, i.e. before in natural state as well as the anisotropy of magnetic sus- tectonic correction, the other is the paleogeographical ceptibility (AMS) is measured before the laboratory i.e., after tectonic correction. In case of geological analysis of the paleomagnetic signal. Some specimens objects, which are monoclinally tilted, typical of the out- (the number of them depends on the degree of unifor- crops suitable for paleomagnetic study in the Hronicum, mity of the NRM), from each outcrop are demagnetized decision about the pre- or post-deformation age of the in several steps with alternating field or with thermal remanence is made on an assemblage of localities, method, till the NRM signal is lost. Referring to item 3 which are geographically distributed and are of similar of the pre vious chapter, this is very important, since the ages. NRM can be composite (e.g. a primary magnetization It was also agreed on that in the case of the nappe sys- can be overprinted during regional or local heating as tems of the Central Western Carpathians the sampling well as by geological processes in an uplifted position). localities should be distributed as much as possible in During thermal demagnetization, the magnetic suscepti- E–W directions, so that the model of oroclinal bending bility is monitored in order to follow possible changes in can be tested. magnetic mineralogy, as heating can produce a new magne tic phase either with lower (e.g. magnetite or maghemite converted to hematite) or higher (e.g. pyrite Summary of the results so far obtained for converted to magnetite) susceptibilities. The magnetic the Hronic Unit mineral(s) originally present in the rock must be identi- fied with magnetic methods, like Curie-point measure- Permian red beds and volcanic rocks ment or the thermal demagnetization of laboratory induced remanence. Both types of rocks were studied from the Nízke Tatry As a result of demagnetization and re-measurement of Mts. (18 localities/sites, Fig. 2C) and only lava flows the remaining NRM after each step so called demagneti- from the Malé Karpaty Mts. (four sites, Fig. 2B). Except zation curves are produced, which can be analyzed for one locality of the red beds, all the studied rocks had linear segments. Sometimes the NRM is single compo- reversed polarity magnetizations. The majority is nent, more often it is composite (Fig. 1). In the latter case, characterized by shallow inclinations, suggesting it is usual, that the component which is more resistant to near-equatorial position in the northern hemisphere of the Hronicum during the Permian (8.2°) and suggesting N, up a net rotation (summary of the rotations taking place P15 N, up T10 after the Permian) of about 70° in the CW sense. Rocks SMP67 SMP 371B 1 unit basalt Middle Triassic collected from the area of the Malužiná valley have TH W E = 8 limestone steeper inclinations (corresponding to a paleolatitude of 0 AF mA/m 23.3°, similar to the expected Late Triassic latitude for 1 unit a position between Europe and Africa) and about 35° of = 4 mA/m °C 0. CW net rotation, after the acquisition of the paleomag- R0 = 180 mA/m °C k0 = 7455*10-6SI R0 =m1.4 A/m netic signal. W E k0 = 61.9*10-6SI S, down S, down Anisian–Norian carbonates Fig. 1. Examples of a single component (P15) and a composite (T10) magnetization, respectively. Both specimens were ther- Of the 14 localities studied one is from the Strážovské mally demagnetized in several steps, till the NRM (hollow circles on the right-side diagrams) was destroyed, while the susceptibilty vrchy Mts., the rest from the Nízke Tatry Mts. (Fig. 2A). monitored (full circles on the right-side diagrams). They have magnetizations of pre-deformation age. 34 GEOLOGICA CARPATHICA 70, SMOLENICE, October 9–11, 2019 GEOLOGICA CARPATHICA 70, SMOLENICE, October 9–11, 2019 A n 20°00´ ter Ca s rpa A We thia ns Wien Bratislava E a Eastern Alps Budapest s F t e F r F F n F Pannonian T High Tatra tra Basin a ts. F ern . F Zagreb uth M Dinarides Beograd So F Choč M H H H C um V. Fatra H H en . H H né Mts H H M ranisko ts. žovce B H Stra H H Low Tatra Žiar H H Čertovica M H H T ts thrust line T .
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