Mathematics – Logic
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.314..154x&link_type=abstract
Nature (ISSN 0028-0836), vol. 314, March 14, 1985, p. 154-156. Research supported by the Chinese Academy of Sciences.
Mathematics
Logic
17
Geological Surveys, Iridium, Sedimentary Rocks, Stratigraphy, Trace Elements, Abundance, Boundary Layers, China, Fossils
Scientific paper
Despite recent searches for anomalous iridium (Ir) concentrations at the Permian/Triassic boundary (P/Tr) of marine sediments, no Ir above a level of 0.5 p.p.b. 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, China. An investigation of Ir and trace-element abundances in the P/Tr boundary layer of Shangsi section, Guangyuan County, Sichuan Province is reported here. 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.
Chai Zhi-Fang
Ma Sheng-Li
Mao Xue-Ying
Sun Yadong
Xu Yong-Da
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