哀牢山构造带古构造应力场特征

通过野外对哀牢山构造带漠沙镇、戛洒镇两地的哀牢山群中的构造形迹和形变特征进行观察和记录，将哀牢山构造带的应力场初步划分为韧性和脆性两期，并通过对构造带中的各种小构造（片理、劈理、褶皱、构造透镜体、擦痕及节理等）进行构造解析，初步获得了哀牢山构造带中至少存在两期构造应力场，其主压应力方向:北东—南西和北西—南东向挤压，现今构造应力场继承了古构造应力场；最后结合前人研究成果，简要分析了哀牢山构造带两种不同构造应力场的动力来源，即可能与构造带所处的周边板块和深部流体挤压作用有重要联系。 

CHARACTERISTICS OF PALEOTECTONIC STRESS FILED ON THE AILAOSHAN STRUCTURAL BELT

By observing and recording structural feature and deformation of the Ailaoshan Group inthe field at Mosha and Jiasa, the stress filed shall be preliminarily divided into two stages： theductile deformation and brittle deformation. Based on the structural analysis of the stress field for allsorts of small structures, such as schistosity, cleavage, fold, tectonic lens, scratch and theconjugated joints, etc. in the field, it reveals that there exists two tectonic stress fields in theAilaoshan structural belts, with main stress orientations of NE-SW and NW-SE compressions. Thepresent stress filed sustains the paleotectonic stress filed. Combing with the previous researchresults, the dynamic sources of two different tectonic stress fields on the Ailaoshan belt are studiedbriefly, which may be critically linked to its peripheral plates and deep fluid extrusion.