气候变化领域集成服务门户(CCPortal): Large-scale Variscan shearing at the southeastern margin of the eastern Rhenohercynian belt: a reinterpretation of chaotic rock fabrics in the Harz Mountains; Germany

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DOI	10.1007/s00531-019-01763-1
	Large-scale Variscan shearing at the southeastern margin of the eastern Rhenohercynian belt: a reinterpretation of chaotic rock fabrics in the Harz Mountains; Germany
	Friedel C.-H.; Huckriede H.; Leiss B.; Zweig M.
发表日期	2019
ISSN	14373254
起始页码	2295
结束页码	2323
卷号	108 期号:7
英文摘要	For the past 50 years, large parts of the Harz Mountains (eastern Rhenohercynian Zone, Germany) have been considered to consist of olistostromes of Early Carboniferous age, which were later deformed by Variscan tectonics. The olistostrome model was associated with the assumption that sliding of coherent nappe units occurred contemporaneously with the submarine mass-flow processes. A sedimentary origin of olistostromes was derived mainly from the block-in-matrix fabric of the rocks, assumed soft-rock deformation fabrics, and the composition and age of blocks. Based on available biostratigraphic data, block composition and fabric studies of outcrops and drilling cores, it can be shown that the fabric of chaotic rocks is mainly caused by Variscan tectonic deformation at Late Carboniferous, without any indication of soft-rock deformation. Processes and structures indicating a tectonic origin are boudinage, extensive cataclasis and transposition of folded rocks, commonly associated with intense mineralization, as well as the regular spatial distribution and orientation patterns of blocks. The chaotic rock fabric mainly evolved in the brittle–ductile transitional zone late-to-post-kinematic relative to the synmetamorphic first cleavage. Widespread chaotic rocks are localized in the allochthonous domain which itself is characterized by generally strong tectonic rock deformation and thrust faulting. Our results suggest that significant mass-flow deposits do not occur. The previously proposed olistostromes are mélanges and broken formations of tectonic origin which form a large-scale network of anastomosing shear zones that penetrate and juxtapose more or less intact coherent rock units of different stratigraphy and provenance. Due to the tectonic origin the entire early Paleozoic sequences may exhibit chaotic rock fabrics. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	Chaotic rock fabrics; Harz Mountains; Olistostromes; Rhenohercynian Zone; Tectonic mélanges; Variscan deformation
语种	英语
scopus关键词	Carboniferous; deformation; Hercynian orogeny; melange; olistostrome; petrofabric; shear; soft rock; Germany; Harz Mountains
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/147786
作者单位	Karl-Marx-Str. 56, Leipzig, 04158, Germany; Thüringer Landesamt für Umwelt, Bergbau und Naturschutz, Göschwitzer Straße 41, Jena, 07745, Germany; Geowissenschaftliches Zentrum Georg-August-Universität Göttingen, Goldschmidtstraße 3, Göttingen, 37077, Germany; Sächsisches Landesamt für Umwelt, Landwirtschaft und Geologie, Pillnitzer Platz 3, Dresden, 01326, Germany
推荐引用方式 GB/T 7714	Friedel C.-H.,Huckriede H.,Leiss B.,et al. Large-scale Variscan shearing at the southeastern margin of the eastern Rhenohercynian belt: a reinterpretation of chaotic rock fabrics in the Harz Mountains; Germany[J],2019,108(7).
APA	Friedel C.-H.,Huckriede H.,Leiss B.,&Zweig M..(2019).Large-scale Variscan shearing at the southeastern margin of the eastern Rhenohercynian belt: a reinterpretation of chaotic rock fabrics in the Harz Mountains; Germany.International Journal of Earth Sciences,108(7).
MLA	Friedel C.-H.,et al."Large-scale Variscan shearing at the southeastern margin of the eastern Rhenohercynian belt: a reinterpretation of chaotic rock fabrics in the Harz Mountains; Germany".International Journal of Earth Sciences 108.7(2019).