NDLI: Terminal Ediacaran anoxia in deep-ocean: Trace element evidence from cherts of the Liuchapo Formation, South China

Content Provider	Springer Nature Link
Author	Chang, HuaJin Chu, XueLei Feng, LianJun Huang, Jing
Copyright Year	2009
Abstract	Here we report a detailed trace element study of the cherts from Liuchapo Formation, which is a terminal Ediacaran (551-542 Ma) succession in South China deposited in deep-water basinal setting. The REE of Liuchapo cherts shows similar features as observed for anoxic modern seawater (but not for hydrothermal fluids), characterized by positive La anomaly (La$_{N}$/Ce$_{N}$ = 0.83–1.91, average 1.37), moderately negative Ce anomaly (0.53–1.1, average 0.73), positive Gd anomaly (average 1.08), positive Y anomaly (average 1.21), and depleted LREE and MREE. In addition, the Liuchapo cherts have low ΣREE (3.36–56.13 ppm, average 20.6 ppm), low Al$_{2}$O$_{3}$, Ti, Th and Zr concentrations, and high Y/Ho ratios (up to 43.9). The redox-sensitive trace elements concentrations in the cherts do not correlate with detrital input proxies. All of these features suggest that the redox-sensitive trace elements in the cherts were authigenically concentrated in water column and their concentrations thus are excellent indicators of ancient redox conditions. Very low Th/U ratios, high V/(V+Ni) and Fe$_{⊤}$/Al ratios, enrichments of redox-sensitive trace elements (U, V, Mo), and low concentration of Mn in the cherts imply anoxia in the deep seawater. Our data reveal that the terminal Ediacaran ocean was not completely oxidized and the deep ocean was still anoxic, at least in South China. We propose that although the oxidative events existed in the terminal Ediacaran oceans, decomposition of organic matter prolonged anoxia in the deep ocean.
Starting Page	807
Ending Page	822
Page Count	16
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	52
Issue Number	6
e-ISSN	18622801
Language	English
Publisher	SP Science in China Press
Publisher Date	2009-06-12
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	chert anoxia trace elements redox proxy Ediacaran South China Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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