气候变化领域集成服务门户(CCPortal): Seismic interpretation and structural restoration of the Heligoland glaciotectonic thrust-fault complex: Implications for multiple deformation during (pre-)Elsterian to Warthian ice advances into the southern North Sea Basin

CCPortal

DOI	10.1016/j.quascirev.2019.106068
	Seismic interpretation and structural restoration of the Heligoland glaciotectonic thrust-fault complex: Implications for multiple deformation during (pre-)Elsterian to Warthian ice advances into the southern North Sea Basin
	Winsemann J.; Koopmann H.; Tanner D.C.; Lutz R.; Lang J.; Brandes C.; Gaedicke C.
发表日期	2020
ISSN	0277-3791
卷号	227
英文摘要	Despite a long history of research, the locations of former ice-margins in the North Sea Basin are still uncertain. In this study, we present new palaeogeographic reconstructions of (pre-) Elsterian and Warthian ice-margins in the southeastern North Sea Basin, which were previously unknown. The reconstructions are based on the integration of palaeo-ice flow data derived from glaciotectonic thrusts, tunnel valleys and mega-scale glacial lineations. We focus on a huge glaciotectonic thrust complex located about 10 km north of Heligoland and 50 km west of the North Frisian coast of Schleswig-Holstein (Northern Germany). Multi-channel high-resolution 2D seismic reflection data show a thrust-fault complex in the upper 300 ms TWT (ca. 240 m) of seismic data. This thrust-fault complex consists of mainly Neogene delta sediments, covers an area of 350 km2, and forms part of a large belt of glaciotectonic complexes that stretches from offshore Denmark via northern Germany to Poland. The deformation front of the Heligoland glaciotectonic complex trends approximately NNE-SSW. The total length of the glaciotectonic thrust complex is approximately 15 km. The thrust faults share a common detachment surface, located at a depth of 250–300 ms (TWT) (200–240 m) below sea level. The detachment surface most probably formed at a pronounced rheological boundary between Upper Miocene fine-grained pro-delta deposits and coarser-grained delta-front deposits, although we cannot rule out that deep permafrost in the glacier foreland played a role for the location of this detachment surface. Restored cross-sections reveal the shortening of the complex along the detachment to have been on average 23% (ranging from ca. 16%–50%). The determined ice movement direction from east-southeast to southeast suggests deformation by an ice advance from the Baltic region. The chronospatial relationship of the thrust-fault complex and adjacent northwest-southeast to northeast-southwest trending Elsterian tunnel valleys implies a pre-Elsterian (MIS 16?) age of the glaciotectonic complex. However, the age of these Elsterian tunnel valleys is poorly constrained and the glaciotectonic complex of Heligoland may also have been formed during an early Elsterian ice advance into the southeastern North Sea Basin. The glaciotectonic complex underwent further shortening and the Elsterian tunnel-valley fills that were incised into the glaciotectonic complex were partly deformed during the Saalian Drenthe and Warthe (1) ice advances. © 2019 The Authors
英文关键词	Glaciotectonics; North Sea; Pre-Elsterian ice-margin; Retrodeformation; Tunnel valley; Warthian ice-margin
语种	英语
scopus关键词	Deformation; Deposits; Faulting; Landforms; Offshore oil well production; Restoration; Sea level; Seismic waves; Seismology; Underwater construction; Glaciotectonics; North Sea; Pre-Elsterian ice-margin; Retrodeformation; Warthian ice-margin; Ice; deformation; environmental restoration; glaciotectonics; ice margin; Neogene; permafrost; Saalian; seismic reflection; seismicity; thrust fault; tunneling; Atlantic Ocean; Denmark; Drenthe; Germany; Helgoland; Netherlands; North Frisian Islands; North Sea; Poland [Central Europe]; Schleswig-Holstein; Warta River
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151655
作者单位	Institut für Geologie, Leibniz Universität Hannover, Callinstraße 30, Hannover, 30167, Germany; Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, Hannover, 30655, Germany; Leibniz Institut für Angewandte Geophysik, Stilleweg 2, Hannover, 30655, Germany
推荐引用方式 GB/T 7714	Winsemann J.,Koopmann H.,Tanner D.C.,et al. Seismic interpretation and structural restoration of the Heligoland glaciotectonic thrust-fault complex: Implications for multiple deformation during (pre-)Elsterian to Warthian ice advances into the southern North Sea Basin[J],2020,227.
APA	Winsemann J..,Koopmann H..,Tanner D.C..,Lutz R..,Lang J..,...&Gaedicke C..(2020).Seismic interpretation and structural restoration of the Heligoland glaciotectonic thrust-fault complex: Implications for multiple deformation during (pre-)Elsterian to Warthian ice advances into the southern North Sea Basin.Quaternary Science Reviews,227.
MLA	Winsemann J.,et al."Seismic interpretation and structural restoration of the Heligoland glaciotectonic thrust-fault complex: Implications for multiple deformation during (pre-)Elsterian to Warthian ice advances into the southern North Sea Basin".Quaternary Science Reviews 227(2020).