秦岭造山带中段中新生代构造抬升的热年代学证据  

Thermochronological Evidence of Tectonic Uplift for the Middle Area of Qinling in Meso-Cenozoic

作　　者：李齐[1] 王瑜[1] 万景林[1] 李大明[1] 王非[1] 

机构地区：[1]中国地震局地质研究所,北京100029

出　　处：《矿物岩石地球化学通报》2001年第4期263-265,共3页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目 ( 4 99730 18)

摘　　要：秦岭造山带中段沙沟街韧性剪切南北两侧岩体的Ar Ar、MDD模式计算及磷灰石裂变径迹测量结果表明 ,秦岭造山带中新生代期间南北两侧表现出不同的冷却过程 ,北侧在 140Ma期间发生快速冷却 ,而南侧除 30 0～ 2 0 0Ma期间发生过快速冷却外 ,在 130～ 90Ma期间发生过快速冷却。反映了秦岭造山带碰撞之后陆内造山的不一致性 ,这与区内的构造作用过程相一致。Using cooling curves of K-feldspars obtained by specific 40Ar/ 39Ar step heating procedure and multiple diffusion domain modeling (MDD model), together with results of biotite and apatite dating, the cooling history of rock body from Cuihua Mountain in NE to Fuping in SW middle area of Qinling belt is discussed. The results indicate that there are different cooling histories at the area in Meso-Cenozoic. In N-Qinling the happening time of rapid cooling began at 140 Ma,but in S-Qinling there existed two times of the rapid cooling events,the first happened at the period of 300-200 Ma,the second during 130-90 Ma.

关 键 词：秦岭造山带 MDD模式 热年代学 

分 类 号：P542[天文地球—构造地质学] P597[天文地球—地质学]