Abstract：Recently,an article with title of “A misunderstanding in provenance analysis: Sand changes of mineral,roundness,and size in flowing-water transportation”published by Professor Hu made a conclusion that,there is a paradox about changing of mineral,roundness,and size between phenomenon from modern river and conclusion from sedimentary petrology textbooks in China,which has been wrongly informed when used in source analysis based on Krumbein tumbling experiment and observation data. Based on former research,this paper holds that results from tumbling experiment shows indicative meaning to sand transportation from river. The results indicate that, as the transportation distance increases, sands get smaller and roundness gets better, and unstable components get less coupled with the chemical during the transportation. Due to the mixing action, the sands are mixed with those with various transportation distance in the transporting process, which leads to the changes of unstable mineral content, roundness and sand size. Textbooks of sedimentary petrology in China made description of the phenomenon mentioned above to different degree, which was widely recognized by a number of sedimentologists. However, it was not fully discussed in Professor Hu's paper published in 2017. Moreover, it seems improper for Professor Hu to determine the transportation distance only by geographic location. And there is no direct evidence showing roundness and sand size are transformed by river transportation. The observation with marked samples is recommended.
Miao Xiaolong,Du Yan. Discussion with Hu: Significant influence of mixing action to clastic particles during the process of flowing transportation and sedimentation[J]. JOPC, 2017, 19(4): 648-652.
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