论文部分内容阅读
昆仑山垭口地区是东昆仑山现代冰川作用中心之一,在第四纪冰期间冰期旋回中保留了多套较为完整的冰川沉积.位于垭口盆地西侧山脊上的望昆冰碛,是本区已知最老的冰川沉积.应用宇宙成因核素10Be暴露年龄方法对望昆冰碛进行年代测定,5个样品中有4个介于(56.9±5.6)～(38.2±3.5)ka BP之间,相当于MIS3阶段,明显年轻于前人所测ESR和古地磁年代,且与地貌系列不符.这一结果不能代表望昆冰碛的实际年代,而应为所测漂砾后期暴露的年代,反映了MIS3阶段昆仑山垭口地区曾遭受过强烈地表剥蚀过程.望昆冰碛10Be暴露年龄显著地年轻,表明应用宇宙核素暴露年代测定冰碛物形成时代具有复杂性,应充分考虑后期剥蚀等地表过程,并应使用其他测年方法进行相互验证.
The Kunlun Mountain Pass area is one of the centers of modern glaciation in the East Kunlun Mountains and has preserved several sets of relatively complete sets of glacial deposits in the glacial cycles during the Quaternary ice period.The Wangkun moraine on the west ridge of the Yakou Basin is the The oldest known glacial sediments were identified, and dating of the Kunlun moraine was performed using the age-exposed cosmic nuclide 10Be. Four of the five samples ranged from (56.9 ± 5.6) to (38.2 ± 3.5) ka BP , Equivalent to the MIS3 stage, significantly younger than the ESR measured by predecessors and paleomagnetic age, and does not match with the series of landforms.This result can not represent the actual age of Wang Kun moraine, but should be the age of the measured late exposure of boulders, Reflecting that the Kunlun Pass area in MIS3 had been subjected to intense surface erosion process.The apparent exposure age of 10Be in the Kunlun Moraine was significantly younger than that in the Mudanjiang Pass, indicating that the age of formation of the moraine was complicated by the age of exposure to the cosmic nuclide and should fully consider the post-denudation Surface processes should be validated using other dating methods.