【摘 要】
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The sedimentary sequence of the Lower Cambrian is a key interval to reveal the early evolution history of the Earth and there occur widespread cherts worldwide.
【机 构】
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StateKeyLaboratoryofGeologicalProcessesandMineralResources,DepartmentofGeology
【基金项目】
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This study is jointly supported by the National Natural Science Foundation of China,科技部资助项目,the Special Foundation for Doctor Subjects in China,We are grateful to Professor Qiu Yuzhuofor his help in t