DOI: 10.1007/s00531-013-0977-2
论文题名: Buried pockmarks on the Top Chalk surface of the Danish North Sea and their potential significance for interpreting palaeocirculation patterns
作者: Masoumi S. ; Reuning L. ; Back S. ; Sandrin A. ; Kukla P.A.
刊名: International Journal of Earth Sciences
出版年: 2014
卷: 103, 期: 2 起始页码: 563
结束页码: 578
语种: 英语
英文关键词: 3D seismic
; Bottom current
; Danish North Sea
; Pockmark
; Top Chalk
英文摘要: Three-dimensional (3D) seismic data from the southern Danish North Sea were used to analyse the morphology and spatial distribution of depressions in the Danian Chalk deposit. Previously, these depressions were either interpreted as karst structures or pockmarks. The observed depressions occur in an interval from 25 ms below to 12 ms above the Top Chalk surface. Three types of depressions were differentiated based on their plan-view geometry and their degree of symmetry: Type 1, comprising sub-circular and symmetrical depressions, is the dominant group (ca. 70 %). Type 2, elongated and symmetrical depressions, represents only a small fraction (ca. 5 %). The elongated and asymmetrical depressions of Type 3 compose ca. 25 %. In cross section, each depression type can be either characterised by a V- or a U-shape. The maximum size of the depressions ranges from 50 to 580 m, with an average internal depth of 10 m. We interpret the depressions as pockmarks formed by the expulsion of biogenic or thermogenic fluids at the Danian seafloor. Likely, the initial form of the pockmarks has been circular (Type 1) and was subsequently modified for Types 2 and 3 to an elongated form by currents. The long axis of the pockmarks is interpreted to represent the effective current direction. The inferred direction is sub-parallel to the palaeobathymetric contours. The 3D seismic interpretation of pockmarks presented in this paper contributes to the understanding of fluid migration and palaeocirculation patterns during the sedimentation of the terminal Chalk Group in the southern Danish North Sea. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84894275147&doi=10.1007%2fs00531-013-0977-2&partnerID=40&md5=54f54b351c85fba0c014480f8913e015
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70352
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Geological Institute, RWTH Aachen University, Wüllnerstr. 2, 52062 Aachen, Germany; Maersk Oil, Esplanaden 50, 1263 Copenhagen K, Denmark
Recommended Citation:
Masoumi S.,Reuning L.,Back S.,et al. Buried pockmarks on the Top Chalk surface of the Danish North Sea and their potential significance for interpreting palaeocirculation patterns[J]. International Journal of Earth Sciences,2014-01-01,103(2)