Neoproterozoic fossils in Mesoproterozoic rocks? Chemostratigraphic resolution of a biostratigraphic conundrum from the north China platform
Xiao, SH; Knoll, AH; Kaufman, AJ; Yin, LM (尹磊明); Zhang, Y
1997-10-01
发表期刊PRECAMBRIAN RESEARCH
ISSN0301-9268
卷号84期号:3-4页码:197-220
摘要

Siliciclastic rocks of the Ruyang Group, southern Shanxi, and the broadly equivalent Gaoshanhe Group, Shaanxi, contain exceptionally well-preserved, large (empty set approximate to 150 mu m) acanthomorphic acritarchs recently interpreted as late Neoproterozoic (Sinian, c. 800-544 Ma) in age. This biostratigraphic interpretation is based on the presence of large acanthomorphs in Sinian successions of South China and elsewhere and the perceived absence of comparable forms in older rocks; it casts doubt on the long-accepted interpretation of Ruyang and correlative rocks as Mesoproterozoic in age (1600-1000 Ma). In contrast, thick marine dolomites in overlying units contain abundant radial fibrous fabrics and a narrow range of delta(13)C values (c. 0+/-1 parts per thousand vs. PDB), features which characterize unambiguously Mesoproterozoic carbonates elsewhere on the North China Platform and on other continents. Age estimates based on petrofabrics and chemostratigraphy are corroborated by a U-Pb zircon age of 999 Ma (no recorded error) for granites which intrude overlying carbonates. Thus, in combination, the available data constrain the Ruyang siliciclastics and overlying carbonates to be older than about one billion years, making Shuiyousphaeridium Yan and other large process-bearing acritarchs from these units among the oldest known distinctly ornamented eukaryotic microfossils. (C) 1997 Elsevier Science B.V.

关键词Acritarchs Chemostratigraphy North China Platform Petrofabrics Proterozoic
语种英语
关键词[WOS]Isotopic Compositions ; Igneous Events ; Carbonate ; Canada ; Australia ; Sediments ; Precipitation ; Successions ; Diagenesis ; Sequences
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:A1997XY30700005
出版者ELSEVIER SCIENCE BV
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/1272
专题中国科学院南京地质古生物研究所
作者单位1.HARVARD UNIV, BOT MUSEUM, CAMBRIDGE, MA 02138 USA
2.ACAD SINICA, NANJING INST GEOL & PALEONTOL, NANJING 210008, PEOPLES R CHINA
3.BEIJING UNIV, FAC LIFE SCI, BEIJING 100871, PEOPLES R CHINA
推荐引用方式
GB/T 7714
Xiao, SH,Knoll, AH,Kaufman, AJ,et al. Neoproterozoic fossils in Mesoproterozoic rocks? Chemostratigraphic resolution of a biostratigraphic conundrum from the north China platform[J]. PRECAMBRIAN RESEARCH,1997,84(3-4):197-220.
APA Xiao, SH,Knoll, AH,Kaufman, AJ,Yin, LM ,&Zhang, Y.(1997).Neoproterozoic fossils in Mesoproterozoic rocks? Chemostratigraphic resolution of a biostratigraphic conundrum from the north China platform.PRECAMBRIAN RESEARCH,84(3-4),197-220.
MLA Xiao, SH,et al."Neoproterozoic fossils in Mesoproterozoic rocks? Chemostratigraphic resolution of a biostratigraphic conundrum from the north China platform".PRECAMBRIAN RESEARCH 84.3-4(1997):197-220.
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