DOI: 10.1007/s00531-016-1393-1
Scopus记录号: 2-s2.0-84988568945
论文题名: Early Cambrian wave-formed shoreline deposits: the Hardeberga Formation, Bornholm, Denmark
作者: Clemmensen L.B. ; Glad A.C. ; Pedersen G.K.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2017
卷: 106, 期: 6 起始页码: 1889
结束页码: 1903
语种: 英语
英文关键词: Bornholm
; Early Cambrian
; Hardeberga Formation
; Medusoids
; Shoreline deposits
; Wave-formed sediments
Scopus关键词: arenite
; Cambrian
; coastal sediment
; dune
; mudstone
; ripple
; shoreline
; transgression
; Bornholm
; Denmark
; Hovedstaden
; Bacteria (microorganisms)
; Discoidae
; Hydroida
英文摘要:
During the early Cambrian, the Danish island Bornholm was situated on the northern edge of the continent Baltica with palaeolatitudes of about 35°S. An early Cambrian (Terreneuvian) transgression inundated large areas of Baltica including Bornholm creating shallow marine and coastline environments. During this period, wave-formed shoreline sediments (the Vik Member, Hardeberga Formation) were deposited on Bornholm and are presently exposed at Strøby quarry. The sediments consist of fine- and medium-grained quartz-cemented arenites in association with a few silt-rich mudstones. The presence of well-preserved subaqueous dunes and wave ripples indicates deposition in a wave-dominated upper shoreface (littoral zone) environment, and the presence of interference ripples indicates that the littoral zone environment experienced water level fluctuations due to tides and/or changing meteorological conditions. Discoidal structures (medusoids) are present in the quarry, but due to the relative poor preservation of their fine-scale structures it is difficult to determine if the discoids represent true medusae imprints or inorganic structures. The preservation of the shallow-water bedforms as well as the possible medusae imprints is related to either the formation of thin mud layers, formed during a period of calm water when winds blew offshore for a longer period, or to the growth of bacterial mats. The orientation of the wave-formed bedforms indicates a local palaeoshoreline trending NE–SW and facing a large ocean to the north. © 2016, Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84988568945&doi=10.1007%2fs00531-016-1393-1&partnerID=40&md5=7feee4810f37b3c737e5bc170dfef8e0
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69985
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: Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, Copenhagen K, Denmark; Geological Survey of Denmark and Greenland, Øster Voldgade 10, Copenhagen K, Denmark
Recommended Citation:
Clemmensen L.B.,Glad A.C.,Pedersen G.K.. Early Cambrian wave-formed shoreline deposits: the Hardeberga Formation, Bornholm, Denmark[J]. International Journal of Earth Sciences,2017-01-01,106(6)