气候变化领域集成服务门户(CCPortal): Late Palaeozoic strike-slip tectonics versus oroclinal bending at the SW outskirts of Baltica: case of the Variscan belt’s eastern end in Poland

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DOI	10.1007/s00531-019-01814-7
	Late Palaeozoic strike-slip tectonics versus oroclinal bending at the SW outskirts of Baltica: case of the Variscan belt’s eastern end in Poland
	Mazur S.; Aleksandrowski P.; Gągała Ł.; Krzywiec P.; Żaba J.; Gaidzik K.; Sikora R.
发表日期	2020
ISSN	14373254
起始页码	1133
结束页码	1160
卷号	109 期号:4
英文摘要	Geophysical and geological data from the eastern sector of the Central European Variscan belt are presented and reviewed in the regional tectonic context. Matched filtering of isostatic gravity, guided by results of spectral analysis, along with other derivatives of gravity and magnetic fields reveal a dominant WNW–ESE-trending pre-Permian structural grain in the external zones of the Variscan belt in Poland. This trend is confirmed by regional distribution of dips in Carboniferous and Devonian strata that were penetrated by boreholes beneath Permian-Mesozoic sediments. Based on these data, two alternative concepts explaining the connection of the Variscan belt and its NE foreland, those of strike-slip tectonics versus oroclinal bending, are discussed. The WNW–ESE structural trend in the Variscan foreland is parallel to a set of major strike-slip fault zones in the area, including those of Upper Elbe, Intra-Sudetic, Odra, Dolsk and Kraków-Lubliniec. These faults are considered to convey a significant dextral displacement between Laurussia and Gondwana. The revised position of the Variscan deformation front shows a similar, uninterrupted, generally WNW–ESE trend, up to the SE border of Poland, which indicates an initial continuation of the Variscan belt into the area of the present-day Western Carpathians. The geometry of the Variscan deformation front along with the pattern of the Variscan structural grain are inconsistent with the idea of an oroclinal loop affecting the external, non-metamorphic Variscan belt. However, the data presented do not entirely rule out an oroclinal loop within the Variscan internides. The still possible options are (1) a semi-oroclinal model postulating ~ 90° bending of the Variscan tectonostratigraphic zones into parallelism with the WNW–ESE strike-slip faults or (2) an orocline limited only to the belt linking the Wolsztyn High and Moravo-Silesian non- to weakly-metamorphic fold-and-thrust belt. Regardless of the kinematic model preferred, our data indicate that structural evolution of the Polish Variscides was concluded with the end-Carboniferous NNE–SSW shortening that resulted in the present-day extent of the Variscan deformation front. © 2020, The Author(s).
英文关键词	Bohemian Massif; Carboniferous; Central Europe; Gravity and magnetic data; Moravo-Silesian; Rhenohercynian; Sudetes; Variscan deformation front; Variscan foreland
语种	英语
scopus关键词	Carboniferous; deformation; foreland basin; gravity field; Hercynian orogeny; magnetic field; strike-slip fault; tectonic evolution; Bohemian Massif; Poland [Central Europe]; Sudetes
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147678
作者单位	Institute of Geological Sciences PAS, Research Centre in Kraków, Senacka 1, Kraków, 31-002, Poland; Institute of Geological Sciences, University of Wroclaw, Cybulskiego 32, Wrocław, 50-205, Poland; Polish Geological Institute-National Research Institute, Rakowiecka 4, Warsaw, 00-975, Poland; Hellenic Petroleum, Maroussi, Greece; Institute of Geological Sciences PAS, Research Centre in Warsaw, Twarda 51/55, Warsaw, 00-818, Poland; Institute of Earth Sciences, University of Silesia, Będzińska 60, Sosnowiec, 41-200, Poland
推荐引用方式 GB/T 7714	Mazur S.,Aleksandrowski P.,Gągała Ł.,等. Late Palaeozoic strike-slip tectonics versus oroclinal bending at the SW outskirts of Baltica: case of the Variscan belt’s eastern end in Poland[J],2020,109(4).
APA	Mazur S..,Aleksandrowski P..,Gągała Ł..,Krzywiec P..,Żaba J..,...&Sikora R..(2020).Late Palaeozoic strike-slip tectonics versus oroclinal bending at the SW outskirts of Baltica: case of the Variscan belt’s eastern end in Poland.International Journal of Earth Sciences,109(4).
MLA	Mazur S.,et al."Late Palaeozoic strike-slip tectonics versus oroclinal bending at the SW outskirts of Baltica: case of the Variscan belt’s eastern end in Poland".International Journal of Earth Sciences 109.4(2020).