摘要
利用宇生核素测年技术对老冰碛形成年代的测定,受到侵蚀速率未知的限制,但可以通过侵蚀速率的最大值2.943*10^-4g/(cm^2*a)及最小值1.81*10^-4g/(cm^2*a)加以界定,取两者的平均值作为该地区的平均侵蚀速率ε平均=2.38*10^-4g/(cm^2*a),同时宇生核素形成速率还受到青藏高原隆升的影响,在隆升速率为0.1875em/a的情况下,计算出老冰碛的形成年代为614.305Ka,相当于深海氧同位素第16期,即该老冰碛是在大约发生于614.
Dating the age of glaciation using cosmogenic isotopes is limited by the unknown erosion rate. But it can be restricted using the maximum erosion rate 2.943 * 10 -4g/cm2/a and minimum erosion rate 1.81 * 10 -4 g/cm2/a. The mean value can be regard as average erosion rate of this region. Uplift of Tibetan Plateau can affect the formation rate of cosmogenic isotopes. When the uplift rate is 0. 1875cm/a , it can be calculated that the formation age of the old glaciation is about 614.3 Ka BP(stage 16 of oxygen isotope of deep sea).
出处
《江苏教育学院学报(自然科学版)》
2003年第3期128-131,共4页
Journal of Jiangsu Institute of Education(Social Science)