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本文通过黄河晋陕峡谷河段21个地点的阶地横剖面观察和阶地对比研究,确定出6级宽谷阶地序列,同时,依据17个放射性测年数据对阶地定年。6级宽谷阶地序列揭示了鄂尔多斯高原第四纪区域造陆隆起和局部构造变形,区域造陆隆起的发生时间比之青藏高原隆起要滞后0.113~0.25Ma,而且,平均区域造陆隆起量比之青藏高原的内部和边缘的隆起量小得多。晋陕峡谷河段发生过3期加积作用幕,指示着造陆隆起景观中的气候变化时间线。渭河盆地北缘的韩城断裂悬崖带记录着构造基准面下降,影响的河流长度仅为21~127km。
In this paper, through the cross-section observation and territorial contrast study of 21 sites in the Yellow River and Jin-Shan Canyon, the sequence of 6-level broad valley terrace was determined. Meanwhile, 17 terrestrial dating data were used to date the terraces. The sequence of 6th grade hilly valley revealed the continent uplift and local tectonic deformation in the Quaternary area of the Ordos Plateau. The occurrence time of regional land uplift was delayed by 0.113 ~ 0.25Ma than the Qinghai-Tibet Plateau uplift, and the average area The uplift is much smaller than the uplift of the interior and margins of the Tibetan Plateau. There are three episodes of accretion action in the section of the Shanxi-Shaanxi Gorge River, indicating the timeline of climate change in the land-built uplift landscape. The Hancheng fault cliff belt at the northern margin of the Weihe River basin recorded a decrease in the structural datum, with the length of only 21-127 km.