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六盘山东西两侧第四纪以来构造差异隆升速率递变性

DOI: 10.11928/j.issn.1001-7410.2015.02.19, PP. 445-452

Keywords: 六盘山,河流阶地,第四纪,构造差异隆升速率,区域活动性

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Abstract:

河流阶地作为第四纪以来较新的沉积地貌单元,在研究区域构造隆升和区域断裂活动性方面扮演重要角色.本文利用前人对六盘山东西两侧黄河、渭河及泾河地区阶地研究成果,借用古地磁及14C等方法测定阶地形成年龄和实测阶地拔河高度已有数据,引进构造差异隆升速率(ΔUT)参数来反映区域构造隆升强弱.通过对兰州黄河阶地、陇西渭河阶地与泾河阶地的构造差异隆升速率对比研究表明,第四纪以来,兰州黄河阶地与泾河阶地4个期次平均构造差异隆升速率(ΔUT)分别为76.87mm/ka、42.88mm/ka、421.06mm/ka和1050mm/ka;平均值为397.70mm/ka;陇西渭河阶地与泾河阶地3个期次内(ΔUT)分别为177.37mm/ka、171.83mm/ka和168.27mm/ka;平均值为172.49mm/ka.说明六盘山西侧总体活动性要强于六盘山东侧,同时六盘山构造带北段较南段活动性强,并有逐渐增强趋势.其主要原因可能是六盘山西侧区域系列NWW、NNW活动构造发育对应力的转换和吸收占据重要位置,而六盘山东侧依附于较稳定的鄂尔多斯地块,对区域应力的转换和吸收不明显.

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