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- W2602808287 abstract "Elemental abundance variations across a Devonian Carboniferous (D'C) boundary section located at Huangmao, Guangxi Zhuang Autonomous Region. China, have been investigated by INAA and RNAA. Abundances of Ir, Au. Ni, Co. Cr, As. Sb, Se, U and V at the D/C boundary shale (14 cm thick) are 156ppt, 14.5ppb. 494ppm. 51.4ppm, 113ppm. 109ppm, 16.4ppra. 16.8ppm. 55.3ppm and 709ppm, higher than the background values of the underlying and overlying stratigraphic samples by factors of 20–100. The geochemical anomaly at the D/C boundary is correlated with the biological mass extinction, e.g. of Palmatolepic gracilis expansa. Pseudopolygnathus trigonicus and other conodont species, and especially of the Clymenides. It implies that an event occurred at the end of the Devonian. But neither volcanic eruption, nor extraterrestrial impact can explain the geochemical anomaly." @default.
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- W2602808287 date "1989-01-01" @default.
- W2602808287 modified "2023-09-27" @default.
- W2602808287 title "Geochemical anomaly at the Devonian/ Carboniferous BOUNDARY, Huangmao, Guangxi, China" @default.
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- W2602808287 doi "https://doi.org/10.1080/08912968909386492" @default.
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