Abundance variation of iridium and trace elements at the Permian/Triassic boundary at Shangsi in China

Autor:	Xu Dao-Yi, Ma Shulan, Chai Zhifang, Mao Xuo-Ying, Zhang Qin-Wen, Yang Zheng-Zhong, Sun Yi-Ying
Rok vydání:	1985
Předmět:	Multidisciplinary biology Paleozoic Permian Trias chemistry.chemical_element biology.organism_classification Paleontology Boundary layer chemistry Stratigraphy Sedimentary rock Iridium Mesozoic Geology
Zdroj:	Nature. 314:154-156
ISSN:	1476-4687 0028-0836
DOI:	10.1038/314154a0
Popis:	Despite recent searches for anomalous iridium(Ir) concentrations at the Permian/Triassic boundary (P/Tr) of marine sediments1–3, no Ir above a level of 0.5 p.p.b. (parts per 109) has been found. Detailed event–stratigraphical research has revealed a comparatively high platinum-group enrichment and geochemical anomalies of trace elements in the P/Tr boundary clay at Meishan, Changxing County, Zhejiang Province, China4. We report here an investigation of Ir and trace-element abundances in the P/Tr boundary layer of Shangsi section, Guangyuan County, Sichuan Province (Fig. 1). An Ir value of 2 p.p.b. detected in the boundary layer supports the occurrence of an extraterrestrial event at the end of the Permian.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::707cff80bf1d21407f118b57891d06a4 https://doi.org/10.1038/314154a0 Zobrazit plný text záznamu