嘉黎断裂带两侧晚新生代差异隆升的磷灰石裂变径迹纪录  

Record of Apatite Fission Track of the Differential Uplift in Both Sides of Jiali Fault Belt since Late Cenozoic

作　　者：向树元民 马新民[1] 泽仁扎西 巴桑次仁 

机构地区：[1]中国地质大学地球科学学院,湖北武汉430074 [2]西藏自治区地质调查院,西藏拉萨850007

出　　处：《地球科学（中国地质大学学报）》2007年第5期615-621,共7页Earth Science-Journal of China University of Geosciences

基　　金：中国地质调查局综合研究项目(No1212010610103);区调项目(No200313000022);国家自然科学基金项目(No40672137)

摘　　要：对嘉黎断裂带两侧的磷灰石裂变径迹年代学测试表明，断裂带北侧的磷灰石裂变径迹年龄在5．6～11．7Ma之间，属中新世晚期；断裂带南侧的磷灰石裂变径迹年龄明显较小，6个样品中有5个样品的磷灰石裂变径迹年龄在4．0～5．9Ma之间，属上新世早期．嘉黎断裂带北侧5．6～11．7Ma期间的隆升速率为0．07～0．09mm／a．5．8Ma以来平均剥露速率为0．50mm／a，平均隆升速率1．33mm／a．断裂带南侧4．7Ma以来平均剥露速率为0．62mm／a，平均隆升速率1．68mm／a．两侧样品都反映上新世以来有较强烈的隆升作用，并且南侧比北侧隆升作用更强烈．The apatite fission track （AFT） chronology in both sides of Jiali fault belt shows that the AFT age in the north side of the fault belt is 5.6-11.7 Ma which belongs to Late Miocene; and the age of the south side is obviously younger, because the ages of five out of six samples are between 4.0 Ma and 5, 9 Ma, belonging to early Pliocene. During 5. 6- 11.7 Ma, the uplift rate in the north side of Jiali fault belt is 0. 07-0.09 mm/a. Since 5.8 Ma, the average denudation rate is 0. 50 mm/a, and the average uplift rate is 1.33 mm/a in the north side. While, the average rate of denudation and uplift is 0. 62 mm/a and 1.68 mm/a in the south side of Jiali fault belt since 4.7 Ma. The samples collected from both sides of Jiali fault belt reflect the strong uplift since Pliocene, and the south side uplifts more strongly than the north side.

关 键 词：嘉黎断裂带 晚新生代 磷灰石裂变径迹 高原隆升 

分 类 号：P54[天文地球—构造地质学]