DOI: 10.1007/s00531-015-1155-5
Scopus记录号: 2-s2.0-84931575069
论文题名: Types of soft-sediment deformation structures in a lacustrine Ploužnice member (Stephanian, Gzhelian, Pennsylvanian, Bohemian Massif), their timing, and possible trigger mechanism
作者: Stárková M. ; Martínek K. ; Mikuláš R. ; Rosenau N.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2015
卷: 104, 期: 5 起始页码: 1277
结束页码: 1298
语种: 英语
英文关键词: Bioturbation
; Bohemian Massif
; Early diagenetic carbonate
; Krkonoše Piedmont Basin
; Lacustrine facies
; Soft-sediment deformation structures
; Stephanian C
Scopus关键词: bioturbation
; carbonate sediment
; deformation
; facies analysis
; fluvial deposit
; lacustrine deposit
; paleoenvironment
; sedimentary structure
; Stephanian
; trigger mechanism
; Bohemian Massif
; Czech Republic
英文摘要: The succession of Stephanian C lacustrine and fluvial facies of the Ploužnice member (Semily Formation) paleolake in the Krkonoše Piedmont Basin (northern Czech Republic) preserved in borehole Sm-1 shows five types of soft-sediment deformation structures (SSDS): (1) sediment injections (clastic dikes), (2) load structures and ball-and-pillow structures, (3) water-escape structures (discontinuous laminations, deformed wavy bedding, recumbent folding, and dish or pillar structures), (4) deformations by growth of carbonate and silica minerals during diagenesis, and (5) bioturbation. Bioturbations disturbing mechanical SSDS suggest that soft-sediment deformations may occur syndepositionally or soon after deposition. The discussed mechanical SSDS are developed in a lacustrine environment, most being in lower shoreface and offshore facies. The mechanical SSDS found in the Ploužnice lake deposits occur in all lacustrine facies associations (290 SSDS horizons in a 67-m-thick succession). The cumulative thickness in cm of mechanical SSDS horizons per meter of thickness (ratio cm SSDS/m) is the highest in lower shoreface facies where it reaches from 50 up to 59.7 cm SSDS/m. Offshore facies association reaches 44 cm SSDS/m. Upper shoreface facies associations have 25.9 and 26.0 cm SSDS/m, while nearshore/mudflat facies associations preserve from 22.5 to 20.5 cm SSDS/m, and in palustrine carbonate, 13.5 cm mechanical SSDS/m was found. SSDS in fluvial facies are rare (2.9 cm SSDS/m). The distribution of SSDS in the Sm-1 borehole shows clear relationships to sedimentary facies and processes such as density flows or fluctuation of water level. The relationships of particular structures indicate a relative timing of formation which is as follows: sediment deposition was followed by the formation of mechanical SSDS, then by bioturbation, and finally by deformations due to early diagenetic growth of carbonates and silica. The distribution of SSDS in vertical sections and their direct relationship to sedimentary facies point to endogenic rather than external trigger mechanisms such as seismic activity. The main endogenic trigger mechanisms responsible for the origin of SSDS included a Stephanian semi-humid seasonal climate, basin morphology with relatively steep gradients, and elevated source areas, which created a conducive environment for rapid and repeated deposition of sheetfloods and hyperconcentrated flows and turbidites causing syndepositional loading. © 2015, European Union. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84931575069&doi=10.1007%2fs00531-015-1155-5&partnerID=40&md5=7d067d0300668b6298d24f3e969d28b7
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70277
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: Czech Geological Survey, Klárov 3, Prague 1, Czech Republic; Institute of Geology, Academy of Science of the Czech Republic, Rozvojová 269, Prague 6, Czech Republic; Roy M. Huffington Department of Earth Sciences, Southern Methodist University, 3225 Daniel Avenue, Dallas, TX, United States
Recommended Citation:
Stárková M.,Martínek K.,Mikuláš R.,et al. Types of soft-sediment deformation structures in a lacustrine Ploužnice member (Stephanian, Gzhelian, Pennsylvanian, Bohemian Massif), their timing, and possible trigger mechanism[J]. International Journal of Earth Sciences,2015-01-01,104(5)