【摘要】 甘肃临夏盆地毛沟剖面上半部高精密度古地磁测年结果表明该剖面磁极性年龄为4．34-13．07 MaBP,其中东乡组、柳树组与何王家组的年龄分别为13．07-7．8 Ma,7．8-6．4 Ma和6．40-4．34 MaBP．该测年结果与文献[1]测得的结果基本一致．临夏盆地6．40-6．16 MaBP湖泊沉积环境突变,8 MaBP左右毛沟剖面地层磁偏角发生明显偏转,盆地中王家山剖面银川沟背斜大约在6 MaBP左右发生倾斜与变形,这表明临夏盆地8-6 MaBP经历了一次强烈的构造运动．更多还原

【Abstract】 Maogou Section is located in Linxia Basin, Gansu Province. The fine paleomagnetic measurement of age suggests that the polarity time of Maogou upper section is 4.34-13.07 MaBP. The result is basically consistent with the result of reference [1]. The obvious changes of the sedimental type and the average declinations of Maogou Section by formations both indicate that Linxia Basin experienced a strongly tectonic movement during 8-6 MaBP; the tilting and folding of the strata in the Yingchuanggou anticline, where the Wangjiashan Section is located, further supports the above idea.更多还原