KMS Nanjing Institute of Geology and Palaeonotology,CAS
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 (张俊明); Song, B; Kennedy, MJ; Christie-Blick, N | |
2005-06-01 | |
发表期刊 | GEOLOGY |
ISSN | 0091-7613 |
卷号 | 33期号:6页码:473-476 |
摘要 | Two 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. |
关键词 | U-pb Shrimp Geochronology Neoproterozoic Glaciation Cap Carbonates South China |
DOI | 10.1130/G21418.1 |
语种 | 英语 |
关键词[WOS] | Snowball Earth ; Metazoan Evolution ; Yangtze Platform ; Lesser Himalaya ; Isotopes ; Sea ; Stratigraphy ; Supergroup ; Carbonates ; Seawater |
WOS研究方向 | Geology |
WOS类目 | Geology |
WOS记录号 | WOS:000229454800011 |
出版者 | GEOLOGICAL SOC AMERICA, INC |
文献类型 | 期刊论文 |
条目标识符 | http://ir.nigpas.ac.cn/handle/332004/723 |
专题 | 中国科学院南京地质古生物研究所 |
通讯作者 | Jiang, GQ |
作者单位 | 1.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 |
推荐引用方式 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. |
条目包含的文件 | ||||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论