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普遍认为黄河上游积石峡地区厚约30m的纹泥沉积是由于大型滑坡堵江形成的,然而,滑坡堵江时代以及堵江形成的堰塞湖纹泥沉积历时仍有争议。为了探讨研究区大型滑坡堵江时代及纹泥沉积历程,文中在纹泥底部和顶部各采集1个样品进行14C年代测定。纹泥底部样品的14C年代为9016±425 cal a B.P.,纹泥顶部样品的14C年代为7984±334 cal a B.P.。研究结果表明:黄河上游积石峡地区曾在全新世早期距今约9ka左右发生过大型堵江事件,纹泥沉积的沉积历程约为1ka,这与前人利用纹泥层厚度估算的沉积历程相吻合。该研究可为下游地区第四纪时期文明演化的研究提供一些新的参考。
It is generally accepted that the thick sediments of about 30 m thick in the area along the Yellow River are formed due to the large-scale landslides. However, the sedimentation of the dammed lake sediments during the plugging of the landslide and the blocking of the river is still controversial. In order to discuss the age of the large-scale landslide plugging and the sediment deposition in the study area, one sample was collected at the bottom and the top of the sediment for 14C dating. The 14C age at the bottom of the moat was 9016 ± 425 cal a B.P., and the 14C age at the top of the moat was 7984 ± 334 cal a B.P. The results show that large-scale plug-in events happened in Jishishiag area in the upper Yellow River at about 9 ka ago, and the depositional process of albite sediments is about 1ka, which is consistent with the sedimentary history Match. This study may provide some new references for the study of the evolution of civilization in Quaternary period in the downstream area.