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U-Pb sensitive high-resolution ion microprobe ages from the Doushantuo Formation in south China: Constraints on late Neoproterozoic glaciations
Zhang, SH; Jiang, GQ; Zhang, JM; Song, B; Kennedy, MJ; Christie-Blick, N
2005-06-01
Source PublicationGEOLOGY
ISSN0091-7613
Volume33Issue:6Pages:473-476
AbstractTwo distinctive volcanic ash beds were found in the terminal Proterozoic Doushantuo Formation in south China. The lower ash bed, similar to 2.5 m above the cap carbonate at the base of the Doushantuo, yields a U-Pb zircon age of 621 :+/- 7 Ma, providing the closest upper limit for a correlative of the Marinoan glaciation. The upper ash bed, near the Doushantuo-Dengying boundary, yields a U-Pb zircon age of 555.2 +/- 6.1 Ma, providing for the first time a direct age determination for a prominent negative delta(13)C excursion above the Marinoan glacial level. This excursion, if interpreted to be of glacial origin, is much younger than the Gaskiers Formation (ca. 580 Ma) in Newfoundland, and perhaps the fifth or sixth such level in the Neoproterozoic. That interpretation, however, is not supported by the proliferation of organisms within strata encompassing the negative delta(13)C excursion in south China and globally, by the lack of a ca. 555 Ma glacial record, and by the absence of stratigraphic evidence for sea-level change. The data call for alternative paleoceanographic models for the origin of Neoproterozoic delta(13)C excursions not clearly related to glaciation.
KeywordU-Pb SHRIMP geochronology neoproterozoic glaciation cap carbonates south China
DOI10.1130/G21418.1
Language英语
WOS KeywordSNOWBALL EARTH ; METAZOAN EVOLUTION ; YANGTZE PLATFORM ; LESSER HIMALAYA ; ISOTOPES ; SEA ; STRATIGRAPHY ; SUPERGROUP ; CARBONATES ; SEAWATER
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000229454800011
PublisherGEOLOGICAL SOC AMERICA, INC
Citation statistics
Cited Times:161[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/723
Collection中国科学院南京地质古生物研究所
Corresponding AuthorJiang, GQ
Affiliation1.Univ Nevada, Dept Geosci, Las Vegas, NV 89154 USA
2.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
3.Chinese Acad Geol Sci, Beijing SHRIMP Ctr, Inst Geol, Beijing 100037, Peoples R China
4.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China
5.Univ Calif Riverside, Dept Earth Sci, Riverside, CA 92521 USA
6.Columbia Univ, Lamont Doherty Geol Observ, Palisades, NY 10964 USA
Recommended Citation
GB/T 7714
Zhang, SH,Jiang, GQ,Zhang, JM,et al. U-Pb sensitive high-resolution ion microprobe ages from the Doushantuo Formation in south China: Constraints on late Neoproterozoic glaciations[J]. GEOLOGY,2005,33(6):473-476.
APA Zhang, SH,Jiang, GQ,Zhang, JM,Song, B,Kennedy, MJ,&Christie-Blick, N.(2005).U-Pb sensitive high-resolution ion microprobe ages from the Doushantuo Formation in south China: Constraints on late Neoproterozoic glaciations.GEOLOGY,33(6),473-476.
MLA Zhang, SH,et al."U-Pb sensitive high-resolution ion microprobe ages from the Doushantuo Formation in south China: Constraints on late Neoproterozoic glaciations".GEOLOGY 33.6(2005):473-476.
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