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A possible causal relationship between extinction of dinosaurs and K/T iridium enrichment in the Nanxiong Basin, South China: evidence from dinosaur eggshells
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
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
学科分类Physical Geography; Geology; Paleontology
DOI10.1016/S0031-0182(01)00361-3
通讯作者Zhao, ZK (reprint author), Acad Sinica, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China.
文章类型Article
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.
类目[WOS]Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
收录类别SCI
WOS记录号WOS:000175622600001
引用统计
被引频次:33[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/225427
专题院士_期刊论文
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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.
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