DOI: 10.1111/gbi.12229
Scopus记录号: 2-s2.0-85012108876
论文题名: Experimental fossilization of mat-forming cyanobacteria in coarse-grained siliciclastic sediments
作者: Newman S.A. ; Klepac-Ceraj V. ; Mariotti G. ; Pruss S.B. ; Watson N. ; Bosak T.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2017
卷: 15, 期: 4 起始页码: 484
结束页码: 498
语种: 英语
Scopus关键词: Cambrian
; clay mineral
; cyanobacterium
; Ediacaran
; environmental factor
; experimental study
; fossilization
; marine environment
; microbial mat
; microorganism
; preservation
; sandstone
; siliciclastic deposit
; siltstone
; taphonomy
; Cyanobacteria
; Nostoc sp.
; silicon dioxide
; chemistry
; cyanobacterium
; environment
; fossil
; growth, development and aging
; microbiology
; sediment
; Cyanobacteria
; Environment
; Fossils
; Geologic Sediments
; Silicon Dioxide
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences
; Environmental Science: General Environmental Science
; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: Microbial fossils and textures are commonly preserved in Ediacaran and early Cambrian coarse-grained siliciclastic sediments that were deposited in tidal and intertidal marine settings. In contrast, the fossilization of micro-organisms in similar marine environments of post-Cambrian age is less frequently reported. Thus, temporal discrepancies in microbial preservation may have resulted from the opening and closing of a unique taphonomic window during the terminal Proterozoic and early Phanerozoic, respectively. Here, we expand upon previous work to identify environmental factors which may have facilitated the preservation of cyanobacteria growing on siliciclastic sand, by experimentally determining the ability of microbial mats to trap small, suspended mineral grains, and precipitate minerals from ions in solution. We show that (i) fine grains coat the sheaths of filamentous cyanobacteria (e.g., Nodosilinea sp.) residing within the mat, after less than 1 week of cell growth under aerobic conditions, (ii) clay minerals do not coat sterile cellulose fibers and rarely coat unsheathed cyanobacterial cells (e.g., Nostoc sp.), (iii) stronger disturbances (where culture jars were agitated at 170 rpm; 3 mm orbital diameter) produce the smoothest and most extensive mineral veneers around cells, compared with those agitated at slower rotational speeds (150 and 0 rpm), and (iv) mineral veneers coating cyanobacterial cells are ~1 μm in width. These new findings suggest that sheathed filamentous cyanobacteria may be preferentially preserved under conditions of high fluid energy. We integrate these results into a mechanistic model that explains the preservation of microbial fossils and textures in Ediacaran sandstones and siltstones, and in fine-grained siliciclastic deposits that contain exceptionally preserved microbial mats. © 2017 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85047
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Biological Sciences, Wellesley College, Wellesley, MA, United States; Department of Geosciences, Smith College, Northampton, MA, United States; W. M. Keck Imaging Facility, Whitehead Institute, Cambridge, MA, United States; G. Mariotti. Department of Oceanography and Coastal Sciences & Center for Computation and Technology, Louisiana State University, Baton Rouge, LA, United States
Recommended Citation:
Newman S.A.,Klepac-Ceraj V.,Mariotti G.,et al. Experimental fossilization of mat-forming cyanobacteria in coarse-grained siliciclastic sediments[J]. Geobiology,2017-01-01,15(4)