Abstract：Chemical weathering is a key process in source-to-sink depositional systems,which is controlled by climate,tectonics,topography,vegetation and lithology. Quantifying the intensity of silicate chemical weathering is beneficial to carry out global case study comparison. This paper aims to summarize the sediment chemical weathering indicators,including petrological and mineralogical,element geochemical and non-traditional stable isotope proxies,and point out the potential problems in application. Among these proxies,the composition of sandy sediment framework grains,mineral composition of silty sediments and textural characteristics of mineral surface can clearly indicate chemical weathering intensity,which have been overlooked in most studies and deserve more attention. Clay mineral assemblages and element geochemical indicators,such as CIA,Rb/Sr and αAlE,are most widely used for quantitative analysis of chemical weathering intensity. However,these proxies are easily affected by the sediment source and hydrodynamic sorting. The newly developed indexes of Li,B,K,Mg and Si isotopes show high potentials to evaluate chemical weathering intensity and need further study on their fractionation mechanism. It's important to note that all indicators can be affected by other geological processes from source to sink,e.g., source,hydrodynamic sorting,diagenesis,sediment recycling,pedogenesis,leaching and biological utilization. It is highly suggested to comprehensively use multiple indexes for evaluating silicate chemical weathering intensity,which can effectively improve the accuracy of the analytic results.
Fu Han-Jing,Jian Xing,Liang Hang-Hai. Research progress of sediment indicators and methods for evaluation of silicate chemical weathering intensity[J]. JOPC, 2021, 23(6): 1192-1209.
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