Discovery of a 1.0 Ma Yellow River terrace and redating of the fourth Yellow River terrace in Lanzhou area  

作　　者：PAN Baotian SU Huai HU Chunsheng HU Xiaofei ZHOU Tian LI Jijun 

机构地区：[1]Key Laboratory of Western China＇s Environmental Systems, Ministry of Education, and Department of Geography, Lanzhou Universi-ty, Lanzhou 730000, China

出　　处：《Progress in Natural Science:Materials International》2007年第2期197-205,共9页自然科学进展·国际材料（英文版）

基　　金：Supported by National Natural Science Foundation of China (Grant Nos. 40421101 and 40471016); the Major State Basic Research Development Program of China (Grant Nos. 2005CB422001)

摘　　要：Based on the aeolian loess sequenee-stratigraphie division and paleomagnetie datings on terraces, we found that an undiscovered terrace with the age of 1.0 Ma BP lies between the Dunwashan terrace and Wuyishan terrace. This terrace recorded an intensive Yellow River incision event during that period. Results of paleornagnetic dating and optically stimulated luminescence （OSL） dating of the Wuyishan loess section and Zaoshngou loess section on the fourth Yellow River terrace （T4） show that the age of the fourth Yellow River terrace in Lanzhou area is 0.86 Ma BP rather than the previously believed 0.6 Ma BP. This result answers a long-term question in the geomorphology community of whether there exists a 0.8 Ma terrace in Lanzhou area. The discovery of the 1.0 Ma Yellow River terrace and redating of the age of 0.6 Ma terrace in Lanzhou area provide new insights into further research on the evolution of Yellow River.基于在平台上标明日期的风神的黄土 sequence-stratigraphic 部门和 paleomagnetic，我们与在 Dunwashan 平台和 Wuyishan 梯田之间的 1.0 个妈 BP 谎言的年龄发现那一个未被发现的平台。这在那个时期期间记录了一个集中的黄河切口事件。paeomagnetic 标明日期和在第四个黄河平台(T4 ) 上 Wuyishan 黄土节和 Zaoshugou 黄土节标明日期的光学地刺激的光(OSL ) 的结果证明在 Lanzhou 区域的第四个黄河平台的年龄是在 Lanzhou 区域的 0.86 妈梯田。1.0 妈黄河平台的发现和在 Lanzhou 区域的 0.6 妈梯田的年龄的红 ating 提供新卓见进关于黄河的进化的进一步的研究。

关 键 词：Lanzhou area Yellow River terrace dating. 

分 类 号：P343.5[天文地球—水文科学]