走滑变形过程中的流体包裹体研究——以湘东地区为例

走滑断裂是大陆造山带中一种非常重要的构造类型，并常常成为各种流体异常活动的场所。湘东地区自晚三叠世以来的陆内造山作用形成了ＮＮＥ 向走滑断裂系统。该走滑断裂系统经历了从会聚走滑（Ｔ３ － Ｊ） 向离散走滑（Ｋ－ Ｅ１） 的重大构造性质转换，并明显控制了该地区中新生代的岩浆活动、断陷盆地和区域热液铀成矿作用。本文以湘东地区若干走滑断裂为例， 研究了其中各种构造岩的流体包裹体特征。结果表明，走滑变形过程中伴随着显著的流体活动， 而且在不同变形时期或同一变形期不同变形环境，其流体作用有显著不同。走滑断裂中的流体作用对区域热液铀矿床的形成具有重要意义。

FLUID INCLUSIONS STUDY IN THE PROCESS OF STRIKE SLIP FAULTING--A Case Study in eastern Hunan Province

Strike slip fault is an important tectonic type in continental orogenic belts,and usually acts as a channel way of fluid flow.The intracontinental orogeny since Late Triassic time in eastern Hunan province resulted in a NNE-trending strike slip fault system,which has underwent a critical transformation of tectonic property from convergent(T3-J)to divergent(K-E1)strike slip faulting,and controlled Mesozoic-Cenozoic magmatic activities,fault basins and uranium mineralization in this region.The study of fluid inclusions in tectonites formed in some strike slip faults indicates that intense fluid activities during strike slip faulting not only are very obvious but also have various features at different deformation stages or under different deformation regimes at the same stage.Fluid flow in strike slip fault zones has significant effects on regional hydrothermal uranium mineralization.