DOI: 10.1016/j.palaeo.2014.02.026
论文题名: Late Jurassic Epiphyton-like cyanobacteria: Indicators of long-term episodic variation in marine bioinduced microbial calcification?
作者: Sǎsǎran E. ; Bucur I.I. ; Pleş G. ; Riding R.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 401 起始页码: 122
结束页码: 131
语种: 英语
英文关键词: Calcification
; Cyanobacteria
; Epiphyton
; Late Jurassic
; Romania
英文摘要: Epiphytaceans occur in Late Jurassic shallow-marine reef limestones at several localities in the Carpathian Mountains of Romania. These calcified dendritic microfossils are well-preserved in sparry calcite as sub-millimetric radial clusters of narrow well-defined filaments, 10-30. μm in diameter that show dichotomous branching and consist of dense dark micrite, locally with tubiform structure. Epiphytaceans are widely interpreted as photosynthetic algae or bacteria, but their precise affinities remain elusive and the group may be heterogeneous. These Late Jurassic examples most closely resemble Cambrian Tubomorphophyton and Late Devonian Paraepiphyton. We interpret them to be calcified cyanobacterial sheaths. Post-Devonian records of epiphytaceans are extremely scarce. The Kimmeridgian-Tithonian specimens reported here represent one of the youngest known occurrences of epiphytaceans. Their highly sporadic geological distribution resembles that of marine calcified cyanobacteria, which show Phanerozoic abundance peaks in the Early Paleozoic, Late Devonian-Mississippian, and Late Jurassic-Early Cretaceous. We propose that Kimmeridgian-Tithonian epiphytacean cyanobacteria reflect environmental conditions that favored bioinduced calcification, in particular elevated seawater carbonate saturation state. © 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69374
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology, Babeş-Bolyai University, Str. M. Kogǎlniceanu 1, 400084 Cluj-Napoca, Romania; Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996-1410, United States
Recommended Citation:
Sǎsǎran E.,Bucur I.I.,Pleş G.,et al. Late Jurassic Epiphyton-like cyanobacteria: Indicators of long-term episodic variation in marine bioinduced microbial calcification?[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,401