摘要
对新疆阿尔泰山、西准噶尔山地、天山南北及昆仑山26 条河流河谷阶地的年代学研究表明:高河漫滩主要形成于晚全新世时期3 000 aB.P.;Ⅰ级阶地形成于中全新世时期6 000 aB.P.;Ⅱ和Ⅲ级阶地形成于晚更新世晚期13 000~34 000 aB.P.;Ⅳ级以上阶地形成于晚更新世早期67 000~95 000 aB.P.。这些地貌面的年代是第四纪重要地质事件出现的时期。阶地高出河床的高度(H)与其相应的形成年代(A)有较好的线性对数关系。
By studying the ages of valley terraces of 26 rivers at Altai Mountain, West Jungeer Mountain,southern and northern Tianshan, and Kunlun Mountain, it is indicated that high alluvial flats were mainly formed in 3 000 aB.P. of Late Recent, first order terraces in 6 000 aB.P. of Middle Recent, second and third order terraces in 13 000~34 000 aB.P. of late Late Epileistocene, and the forth or more order terraces in 67 000~95 000 aB.P.of early Late Epileistocene. These ages of the geomorphic surfaces were the periods in which important Quaternary' s geological events took place. In addition, there is a better linear logarithmic relation between the height (H) of a terrace over river bed and its corresponding formation age (A).
出处
《内陆地震》
1998年第1期13-19,共7页
Inland Earthquake
关键词
新疆
河谷阶地
年代学
阶地高程
线性关系
Xinjiang Valley terrace Chronology Terrace elevation Linear relation