中国北方晚新生代红粘土研究之若干问题

Issues on Late Cenozoic red-earth in northern China

对于中国北方地区晚第三纪以来沉积的红粘土的成因,近年来不少学者通过对其粒度、地球化学及古生物等替代性指标的研究,认为该套沉积物为风尘沉积.通过大量野外考察、理论与室内分析测定,认为粒度、地球化学等指标存有多解性,而古生物证据与所谓风成的干旱化环境不相一致,上述指标并不足以成为红粘土风成的确凿证据.因此,进一步深入研究相关替代性指标的研究是今后努力的方向,对红粘土成因的确认不能仅局限于青藏高原的可能影响,全球环境的变化才有可能是解决问题的关键途径.参17.

In recently years, many scholars began to study on the origin of the Neogene red clay in northern China. By analyzing the sediment characters of the grainsize, geochemistry and paleontology,they hold that the red clay was eolian deposition.However, according to a large amount of field investigations,theoretical analysis and data analysis,we suggest that the indexes of grainsize and geochemistry had the multiple solutions character and the palaeontologic evidences weren＇t consistent with the arid climate environment. So the above indexes weren＇t adequate to be the authentic evidences of the red clay＇s eolian origin.Therefore,the trend of future main work is further studies on the correlation indexes.Finally,on the red-earth origin verification, we suggest that one can＇t only limit to the possible impact of Tibet Plateau uplift and the global environment change maybe the key methods for solving the problem. 17refs.