KMS Nanjing Institute of Geology and Palaeonotology,CAS
THE GREAT LATEST ORDOVICIAN EXTINCTION ON THE SOUTH CHINA PLATE - CHEMOSTRATIGRAPHIC STUDIES OF THE ORDOVICIAN SILURIAN BOUNDARY INTERVAL ON THE YANGTZE PLATFORM | |
WANG, K; ORTH, CJ; ATTREP, M; CHATTERTON, BDE; WANG, XF; LI, JJ (李积金) | |
1993-09-01 | |
发表期刊 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY |
ISSN | 0031-0182 |
卷号 | 104期号:1-4页码:61-79 |
摘要 | Continuous samples from four Ordovician Silurian boundary sections of graptolitic shales and mudstones in the Yangtze Basin (Yangtze Platform) on the South China Plate, spanning the latest Ordovician mass extinction of many unrelated groups of organisms, were chemically analyzed for the abundances of about 40 common and trace elements and iridium. It is observed that the abundances of Ir and other siderophile and chalcophile elements (e.g., Co, Cr, As, Mo, Sb and V) show elevated values in the extinction horizon at the base of the graptolite persculptus Zone, which corresponds to the stratigraphic level for the local systemic boundary in China between the ''Ordovician'' and ''Silurian''. Iridium abundances show maxima at this extinction level in three of the four sections analyzed with varying strength, 230 ppT at Yichang, 92 ppT at Jinxian, and 88 ppT at Youyang (but 50 ppT at Xiushan). These geochemical patterns appear to be of global significance, since similar geochemical anomalies (including weak Ir anomaly) were also recorded at about the same stratigraphic level in many other sections previously studied in Quebec, Yukon, Arctic and Northwest Territories, Canada, and Scotland. Although impact by a comet with low platinum group element abundances could have been responsible for the geochemical anomalies, we find it is most plausible to attribute the geochemical signal to the effects of a lower sedimentation rate and reducing water conditions at this horizon, the beginning of a rapid transgression induced by rapid melting of the ice caps on Gondwana. Carbon isotope excursions in organic material at Yichang, together with other carbon isotope data from central Sweden, northwestern Canada, Latvia, Quebec and Wisconsin, suggest that, after a period of decreasing atmospheric and marine pCO2 in the latest Ordovician (the Hirnantian), a sudden, large PCO2 increase in the ocean and atmosphere may have occurred at the extinction horizon at the base of the persculptus Zone. A greenhouse effect might have existed for a short time. What triggered such a sudden pCO2 increase is uncertain, but a rapid CO2 degassing caused by volcanism, tectonics, and/or extraterrestrial impact could have been responsible. |
语种 | 英语 |
关键词[WOS] | Isotopic Composition ; Geochemical Evidence ; Carbon ; Record ; Co2 ; Productivity ; Glaciation |
WOS研究方向 | Physical Geography ; Geology ; Paleontology |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology |
WOS记录号 | WOS:A1993MC87300006 |
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/332004/1310 |
专题 | 中国科学院南京地质古生物研究所 |
作者单位 | 1.UNIV ALBERTA,DEPT GEOL,EDMONTON T6G 2E3,ALBERTA,CANADA 2.YICHANG INST GEOL & MINERAL RESOURCES,YICHANG,PEOPLES R CHINA 3.NANJING INST GEOL & PALEONTOL,NANJING,PEOPLES R CHINA |
推荐引用方式 GB/T 7714 | WANG, K,ORTH, CJ,ATTREP, M,et al. THE GREAT LATEST ORDOVICIAN EXTINCTION ON THE SOUTH CHINA PLATE - CHEMOSTRATIGRAPHIC STUDIES OF THE ORDOVICIAN SILURIAN BOUNDARY INTERVAL ON THE YANGTZE PLATFORM[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,1993,104(1-4):61-79. |
APA | WANG, K,ORTH, CJ,ATTREP, M,CHATTERTON, BDE,WANG, XF,&LI, JJ .(1993).THE GREAT LATEST ORDOVICIAN EXTINCTION ON THE SOUTH CHINA PLATE - CHEMOSTRATIGRAPHIC STUDIES OF THE ORDOVICIAN SILURIAN BOUNDARY INTERVAL ON THE YANGTZE PLATFORM.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,104(1-4),61-79. |
MLA | WANG, K,et al."THE GREAT LATEST ORDOVICIAN EXTINCTION ON THE SOUTH CHINA PLATE - CHEMOSTRATIGRAPHIC STUDIES OF THE ORDOVICIAN SILURIAN BOUNDARY INTERVAL ON THE YANGTZE PLATFORM".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 104.1-4(1993):61-79. |
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 |
个性服务 |
查看访问统计 |
谷歌学术 |
谷歌学术中相似的文章 |
[WANG, K]的文章 |
[ORTH, CJ]的文章 |
[ATTREP, M]的文章 |
百度学术 |
百度学术中相似的文章 |
[WANG, K]的文章 |
[ORTH, CJ]的文章 |
[ATTREP, M]的文章 |
必应学术 |
必应学术中相似的文章 |
[WANG, K]的文章 |
[ORTH, CJ]的文章 |
[ATTREP, M]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
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