Arid
DOI10.1134/S0869593812060068
Microfossils from cap dolomites of the Lower Vendian Churochnaya Formation in the Polyudov Range (North Urals): Paleoecological approach to interpretation of Late Proterozoic glaciations
Sergeev, V. N.; Chumakov, N. M.; Semikhatov, M. A.; Vorob’eva, N. G.
通讯作者Sergeev, V. N.
来源期刊STRATIGRAPHY AND GEOLOGICAL CORRELATION
ISSN0869-5938
EISSN1555-6263
出版年2013
卷号21期号:1页码:1-7
英文摘要

Microfossils from silicified varieties of cap dolomites crowning the section of the tillite-bearing Lower Vendian (Ediacaran) Churochnaya Formation in the Polyudov Range (North Urals) are characterized. These microfossils are the first to be found from Vendian sections of the region and from all the terminal post-glacial sediments, one of the most significant global glaciation Marinoan of the African Glacial Era, when glaciers reached the equator. They are represented by remains of hormogonian and chrococcacean cyanobacteria as well as possible green filamentous algae. This microbiotic assemblage is of relatively low diversity, being composed of taxa with wide stratigraphic ranges characteristic of Proterozoic conservative microbiotas developed in shallow-water siliceous-carbonate facies. The lack of phytoplanktonic microfossils in this biota including Pertatataka-type acanthomorphic acritarchs or Ediacaran Complex Acanthomorph Palynoflora (ECAP) is also consistent with the conclusion on shallow-water deposition of the Churochnaya Formation. Moreover, most cyanobacteria representatives occurring in the latter are characteristic of shallow-water arid environments that confirm a theory of significant temperature increase during accumulation of the cap dolomites after termination of the above-mentioned glaciation. In addition to these microfossils, the cap dolomite member of the Churochnaya Formation contains filamentous and coccoidal pseudofossils formed under influence of post-sedimentary fluids. In their morphometric parameters, they resemble structures described from Archean sections as microfossil remains, which may be a key to interpreting their nature.


英文关键词microfossils cyanobacteria cap dolomites tillites Polyudov Range
类型Article
语种英语
国家Russia
收录类别SCI-E
WOS记录号WOS:000314686100001
WOS关键词BARBERTON MOUNTAIN LAND ; ONVERWACHT GROUP
WOS类目Geology ; Paleontology
WOS研究方向Geology ; Paleontology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/180051
作者单位Russian Acad Sci, Inst Geol, Moscow 119017, Russia
推荐引用方式
GB/T 7714
Sergeev, V. N.,Chumakov, N. M.,Semikhatov, M. A.,et al. Microfossils from cap dolomites of the Lower Vendian Churochnaya Formation in the Polyudov Range (North Urals): Paleoecological approach to interpretation of Late Proterozoic glaciations[J],2013,21(1):1-7.
APA Sergeev, V. N.,Chumakov, N. M.,Semikhatov, M. A.,&Vorob’eva, N. G..(2013).Microfossils from cap dolomites of the Lower Vendian Churochnaya Formation in the Polyudov Range (North Urals): Paleoecological approach to interpretation of Late Proterozoic glaciations.STRATIGRAPHY AND GEOLOGICAL CORRELATION,21(1),1-7.
MLA Sergeev, V. N.,et al."Microfossils from cap dolomites of the Lower Vendian Churochnaya Formation in the Polyudov Range (North Urals): Paleoecological approach to interpretation of Late Proterozoic glaciations".STRATIGRAPHY AND GEOLOGICAL CORRELATION 21.1(2013):1-7.
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