CHARACTERISTICS OF PALEOTECTONIC STRESS FILED ON THE AILAOSHAN STRUCTURAL BELT
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摘要: 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。Abstract: By observing and recording structural feature and deformation of the Ailaoshan Group in the field at Mosha and Jiasa, the stress filed shall be preliminarily divided into two stages: the ductile deformation and brittle deformation. Based on the structural analysis of the stress field for all sorts of small structures, such as schistosity, cleavage, fold, tectonic lens, scratch and the conjugated joints, etc. in the field, it reveals that there exists two tectonic stress fields in the Ailaoshan structural belts, with main stress orientations of NE-SW and NW-SE compressions. The present stress filed sustains the paleotectonic stress filed. Combing with the previous research results, the dynamic sources of two different tectonic stress fields on the Ailaoshan belt are studied briefly, which may be critically linked to its peripheral plates and deep fluid extrusion.
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Key words:
- Ailaoshan /
- structural belt /
- tectonic stress filed /
- dynamics
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图 3 哀劳山群典型构造透镜体产状及赤平投影
Figure 3. The typical tectonic lens in Ailaoshan group and its stereographic projection
图 2 哀牢山群片理带(劈理)及赤平投影
Figure 2. The schistosity zone of Ailaoshan group and its stereographic projection
图 4 哀牢山群中典型褶皱及褶皱轴面赤平投影
Figure 4. The stereographic projection of the axis planes in Ailaoshan group
图 5 哀牢山群中典型的藕节状构造和拉伸线理
Figure 5. The typical joints of lotus roots structure and stretching lineation in Ailaoshan group
图 6 哀牢山群中云母的扭折(正交偏光)
哀牢山群中云母的扭折, 石英波状消光, 同长石构成长英质条带
Figure 6. The mica kinks in Ailaoshan group(Cross-polarized light)
图 7 典型的擦痕及NW-SE向挤压应力场反演结果
Figure 7. Typical scratch and inversion results of the NW-SE compressional stress field
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