| 词条 | Flaser bed |
| 释义 |
Flaser beds are a sedimentary, bi-directional, bedding pattern created when a sediment is exposed to intermittent flows, leading to alternating sand and mud layers. While flaser beds typically form in tidal environments, they can (rarely) form in fluvial conditions - on point bars or in ephemeral streams.[1] Individual sand ripples are created, which are later infilled by mud during quieter flow periods.[1] These mud drapes are typically a minor constituent of the deposit; they can consolidate within three hours, protecting the underlying layer from erosion.[1] Flaser bedding typically forms in high-energy environments[2][3] but some have also been described in turbiditic sediments reworked by contour currents (Rebesco, 2014). References1. ^1 2 {{cite journal | author = Martin, A.J. | year = 2000 | title = Flaser and wavy bedding in ephemeral streams: a modern and an ancient example | journal = Sedimentary Geology | volume = 136 | issue = 1-2 | pages = 1–5 | url = http://linkinghub.elsevier.com/retrieve/pii/S0037073800000853 | accessdate = 2008-04-29 | doi = 10.1016/S0037-0738(00)00085-3|bibcode = 2000SedG..136....1M }} {{geology-stub}}2. ^{{cite web|title=Tidal deposits|url=http://www.uwm.edu/Course/geosci697/tidal/tidal-deposits.html|author=Tom Bellile |date=2003-10-23}} (with photograph) 3. ^{{cite journal | author = Reineck, H.E. |author2=Wunderlich, F. | year = 1968 | title = Classification And Origin Of Flaser And Lenticular Bedding | journal = Sedimentology | volume = 11 | issue = 1-2 | pages = 99–104 | doi = 10.1111/j.1365-3091.1968.tb00843.x|bibcode = 1968Sedim..11...99R }} 1 : Sedimentary structures |
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