古地理学报2017，Vol.19Issue(1)：175-184,10.DOI:10.7605/gdlxb.2017.01.014
物源分析的一个误区：砂粒在河流搬运过程中的变化
A misunderstanding in provenance analysis:Sand changes of mineral, roundness,and size in flowing-water transportation
摘要
Abstract
There is a big misunderstanding in the community of Chinese sedimentologists and was written into the textbooks since 1 970s,that is, “during sediment transport in flowing water,unstable minerals will be eliminated,while the surviving minerals become rounded progressively,and minerals si-zes get smaller”.This idea was wrongly applied in sandstone provenance analysis.This paper overviewed the literatures over one century on this topic,and introduced the research advances of modern river sand studies,especially on the physic controls of sand mineral,roundness,size during transportation.Numer-ous studies in big rivers sands in the world indicated that the unstable minerals such as olivine,pyroxene, amphibole,feldspars and lithic grains survive in thousands of kilometers transportation,while the sand size do not get smaller and sand roundness do not increase with distance downstream.Therefore,the idea to infer distance of provenance based on the amount of unstable minerals,size,and roundness of sand-stones is not based on scientific investigation,and should be corrected in the textbooks.关键词
河流砂/搬运/物源分析/沉积学/磨圆度/碎屑矿物Key words
river sand/transportation/provenance analysis/sedimentology/roundness/detrital mineral分类
天文与地球科学引用本文复制引用
胡修棉..物源分析的一个误区：砂粒在河流搬运过程中的变化[J].古地理学报,2017,19(1):175-184,10.基金项目
国家杰出青年基金项目（编号41525007）和国家自然科学基金项目（编号41472081）共同资助。［Co-funded by the Chinese Na-tional Natural Science Funds for Distinguished Young Scholar （No．41525007） and the National Natural Science Foundation of China （No．41472081）］ （）
