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Quantitative evaluation of the biostratigraphic distribution of acanthomorphic acritarchs in the Ediacaran Doushantuo Formation in the Yangtze Gorges area, South China
McFadden, Kathleen A.1; Xiao, Shuhai1; Zhou, Chuanming (周传明)2; Kowalewski, Michal1
2009-09-01
Source PublicationPRECAMBRIAN RESEARCH
ISSN0301-9268
Volume173Issue:1-4Pages:170-190
Abstract

Doushantuo acanthomorphic acritarchs are large morphologically complex organic-walled microfossils broadly constrained between the similar to 635 Ma Nantuo glaciation and the similar to 551 Ma Miaohe Biota. They are potential biostratigraphic tools for subdivision and correlation of the Ediacaran System in South China. However, major variations in sedimentary facies and stratigraphic thickness present challenges in understanding the spatial and temporal distribution of these acritarchs. Further, the distribution of acritarchs in the Doushantuo Formation is associated with the presence of early diagenetic chert and phosphate, implying a certain degree of preservational bias and/or environmental control. The purpose of this paper is to document the stratigraphic distribution of Doushantuo acritarchs and to quantitatively evaluate their biostratigraphic significance and possible taphonomic-environmental biases, based on high-resolution paleontological data from six sections over similar to 100 km in the Yangtze Gorges area, South China. A total of 1082 acritarch fossils were recorded from 84 chert horizons in the six sections of the study area. These chert horizons are not uniformly distributed throughout the Doushantuo Formation, thus the presence/absence of early diagenetic chert does play a role in controlling the distribution of acritarchs. The sampled chert horizons can be grouped into two stratigraphic intervals in the lower and upper Doushantuo Formation, respectively, based on regional stratigraphic correlation. Quantitative analysis shows that the two intervals are distinct taxonomically and largely independent of taphonomic or facies controls. Thus, the two intervals can be regarded as assemblage biozones. The lower biozone (biozone 1) is numerically dominated by Tianzhushania spinosa (n = 587; 68.3%) and Meghystrichosphaeridium magnificum (n = 74; 8.6%), whereas the upper biozone (biozone 2) is dominated by Ericiasphaera rigida (n = 104; 47.1%) and Tianzhushania spinosa (n = 34; 14.1%). The three most common genera, Meghystrichosphaeridium, Tianzhushania, and Ericiasphaera, have been identified in all sections. Correspondence analysis (CA), detrended correspondence analysis (DCA), discriminant analysis (DA). and pairwise comparisons of samples (Spearman rank coefficient and Jaccard-Chao index), all consistently support biostratigraphic zonations. Thus, the distribution of the Doushantuo acanthomorphs is primarily controlled by biostratigraphic position of samples, with facies and taphonomic differences playing a secondary role. Our case study suggests that acanthomorphic acritarchs can offer a viable toot for regional correlation of the Ediacaran System. (C) 2009 Elsevier B.V. All rights reserved.

KeywordEdiacaran Doushantuo Formation South China Acritarchs Multivariate Analysis
DOI10.1016/j.precamres.2009.03.009
Language英语
WOS KeywordEarly Vendian Microfossils ; Cambrian Microfossils ; Siberian Platform ; Officer Basin ; Diversification ; Assemblages ; Australia ; Evolution ; Stratigraphy ; Signatures
Funding ProjectUS National Science Foundation ; National Natural Science Foundation of China ; Paleontological Society ; Evolving Earth Foundation
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000269297400018
Funding OrganizationUS National Science Foundation ; National Natural Science Foundation of China ; Paleontological Society ; Evolving Earth Foundation
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:66[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/277
Collection中国科学院南京地质古生物研究所
其他
Corresponding AuthorXiao, Shuhai
Affiliation1.Virginia Polytech Inst & State Univ, Dept Geosci, Blacksburg, VA 24061 USA
2.Chinese Acad Sci, Nanjing Inst Geol & Paleontol, State Key Lab Paleobiol & Stratig, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
McFadden, Kathleen A.,Xiao, Shuhai,Zhou, Chuanming ,et al. Quantitative evaluation of the biostratigraphic distribution of acanthomorphic acritarchs in the Ediacaran Doushantuo Formation in the Yangtze Gorges area, South China[J]. PRECAMBRIAN RESEARCH,2009,173(1-4):170-190.
APA McFadden, Kathleen A.,Xiao, Shuhai,Zhou, Chuanming ,&Kowalewski, Michal.(2009).Quantitative evaluation of the biostratigraphic distribution of acanthomorphic acritarchs in the Ediacaran Doushantuo Formation in the Yangtze Gorges area, South China.PRECAMBRIAN RESEARCH,173(1-4),170-190.
MLA McFadden, Kathleen A.,et al."Quantitative evaluation of the biostratigraphic distribution of acanthomorphic acritarchs in the Ediacaran Doushantuo Formation in the Yangtze Gorges area, South China".PRECAMBRIAN RESEARCH 173.1-4(2009):170-190.
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