A possible causal relationship between extinction of dinosaurs and K/T iridium enrichment in the Nanxiong Basin, South China: evidence from dinosaur eggshells
文献类型：期刊论文
| 作者 | Zhao, ZK; Mao XY(毛雪瑛); Chai ZF(柴之芳) ; Yang GC(杨高创); Mao, XY; Chai, ZF; Yang, GC; Kong, P; Ebihara, M; Zhao, ZH
|
| 刊名 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
 |
| 出版日期 | 2002 |
| 卷号 | 178期号:1-2页码:1-17 |
| 关键词 | K/T boundary Ir anomaly trace element dinosaur eggshell dinosaur extinction |
| 通讯作者 | Zhao, ZK (reprint author), Acad Sinica, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China. |
| 英文摘要 | Multiple distinct iridium anomalies have been observed in dinosaur eggshells in the K/T boundary sections of the Nanxiong Basin, Guangdong Province, South China. The eggshells collected at and near the fossil-pollen-defined K/T boundary interval show iridium increases of about 19 and 28 times, respectively, above the background level. The enrichment of other trace elements in the eggshells occurs mostly at and near the interval. The distribution of Ir-bearing levels proves the existence of at least six Ir-delivering events from the latest Cretaceous into the earliest Paleocene. The enrichment of Ir and other trace elements in eggshells may have been caused by the assimilation of these elements into the dinosaur body through food, and then into the eggs laid by them. Two types of pathological development, i.e. variation in eggshell thickness and eggshell microstructure, have been observed from the basin. It seems that they occur frequently during the K/T transition. The physiological mechanisms producing pathologic dinosaur eggshells are evaluated in the light of homologous phenomena occurring in living birds. On this basis, it is concluded that the formation of pathologic dinosaur eggshells was caused by anomalous trace element concentrations. The extinction of the dinosaurs in the Nanxiong Basin did not occur instantaneously, but spread out within 250 ka with major extinction beginning at the boundary interval. The cause may have been environmental poisoning and adverse changes in climatic conditions as indicated by the geochemical analyses of the dinosaur eggshells. A repeating short- and long-term geochemically induced environmental stress adversely affected the reproductive process and contributed to the extinction of the dinosaurs. (C) 2002 Elsevier Science B.V. All rights reserved. |
| 学科主题 | Physical Geography; Geology; Paleontology |
| 类目[WOS] | Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology |
| 收录类别 | SCI |
| WOS记录号 | WOS:000175622600001 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/225427]  |
| 专题 | 高能物理研究所_院士 |
| 推荐引用方式 GB/T 7714 | Zhao, ZK,Mao XY,Chai ZF,et al. A possible causal relationship between extinction of dinosaurs and K/T iridium enrichment in the Nanxiong Basin, South China: evidence from dinosaur eggshells[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2002,178(1-2):1-17. |
| APA | Zhao, ZK.,毛雪瑛.,柴之芳.,杨高创.,Mao, XY.,...&Zhao, ZH.(2002).A possible causal relationship between extinction of dinosaurs and K/T iridium enrichment in the Nanxiong Basin, South China: evidence from dinosaur eggshells.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,178(1-2),1-17. |
| MLA | Zhao, ZK,et al."A possible causal relationship between extinction of dinosaurs and K/T iridium enrichment in the Nanxiong Basin, South China: evidence from dinosaur eggshells".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 178.1-2(2002):1-17. |
入库方式： OAI收割
来源：高能物理研究所
浏览0
下载0
收藏0
其他版本
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。