Average Background Values of 39 Chemical Elements in Stream Sediments of China
Shi Changyi
Liang Meng
Feng Bin
Abstract：Large amounts of high quality basic geochemical data covering a land area of about 6 900 000 square kilometers have been gained by regional geochemical survey mainly featuring stream sediment measurement since 1978 in China.The develop-ment and utilization of the comparative data in different areas and different ranges is an important part of the research of disper-sion of element enrichment,metallogenic tendency,and anomaly evaluation.Based on the total original data of the national 1:200 000 stream sediment survey,background values of 39 elements in stream sediments are calculated for the nationwide 9 tec-tonic units,12 landscape areas and 19 metallogenic belts.The median of the data set after disposable eliminating outliers from a data population with X±3S as the critical value is used as an estimate value of geochemical background values.Different ele-ment distributions and characters of background values of the nationwide tectonic units,landscape areas and metallogenic belts are discussed.The results show that geochemical distributions of elements are different among various landscapes,metallogenic belts and tectonic units because of different geological backgrounds and landscape conditions.It shows there are different region-al distribution characteristics and the different distribution patterns.These background values can be used as basic data for com-parison for further development and utilization of regional geochemical data.
Keywords：medianbackground valuestream sedimentregional geochemical surveygeochemistry
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：18( 234-251 )