青藏高原东南部及三江地区新生代构造隆升——来自裂变径迹热史反演分析  

Uplift of southeastern Tibet and Sanjiang area during Cenozoic era——Thermal inversion analysis from fission track data

作　　者：金维浚[1] 何登发[2] 雷振宇[3] 孔祥儒[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国地质大学,北京100083 [3]中国石油勘探开发研究院,北京100083

出　　处：《地质科学》2012年第3期714-729,共16页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金重大项目(编号:90714007)资助

摘　　要：通过对青藏高原东南部及三江地区8个样品磷灰石和锆石裂变径迹分析、热史反演,对这一地区构造运动及隆升作用进行定量分析。表明青藏高原东南部新生代以来经历两次构造抬升期,在50 Ma和6～5 Ma,其特点是早期为缓慢隆升;晚期为快速抬升期,抬升速率为0.5 mm/a。位于三江地区扬子地块的楚雄盆地构造隆升受青藏高原隆升的影响,受盆地中部构造和古隆起影响,盆地东西部次级坳陷在120～60 Ma表现为相反垂向运动趋势,盆地表现为50 Ma左右有一次相一致抬升运动趋势。总结本区裂变径迹年龄及长度分布规律,表明北东向构造分界明显,可能是印度地块与冈底斯地块碰撞后在东南无约束边界条件下侧向扩展形成。We analysis the regional tectonics uplift quantitatively and the thermal history inversion of in the southeast Tibet Plateau and Sanjiang area by 8 apatite and zircon fission track samples. The research indicates that the southeast Tibet Plateau experiences two tectonics uplift stages. The tectonics uplift is at 50 Ma and 6 - 5 Ma separately. Its characteristic is of slow uplift in the early stage, and fast uplift rate at 0.5 mm/a during the later stage. The tectonics uplift in Chuxiong Basin of Sanjiang area is affected by the middle fault and basement uplifts. The vertical movements are shown opposite trend in the Eastern and Western sub depression separately during 120 - 60 Ma. The cohesive uplift is occurred about 50 Ma affected by the Tibet Plateau uplift. The NE trend of ages and lengths distribution of samples in the area is resulted by the lateral extension on the condition of SE free boundary after Indian and Gangdese blocks collision.

关 键 词：裂变径迹 热史反演 构造分析 隆升 

分 类 号：P542[天文地球—构造地质学]