STRUCTURAL FEATURES AND TECTONIC EVOLUTION OF THE WEI-ZI-LUO FAULT ZONE IN SOUTHWESTERN GUIZHOU PROVINCE
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摘要: 威-紫-罗断裂带作为扬子板块南缘陆内较大的断裂, 控制着周围地区的盆地沉积及构造样式。本文通过野外地质勘查、平衡剖面技术及流体包裹体测温, 探讨了威-紫-罗断裂带的空间结构特征及构造演化历史。结果显示, NW-SE向威-紫-罗断裂带空间分段特征清楚, 运动性质以逆冲和左旋走滑活动为主。流体包裹体测温结果指示该断裂变形环境位于上地壳, 以脆性变形为主, 温度小于200 ℃。剖面复原结果显示, 断裂带在早泥盆世-中三叠世时期处于引张伸展构造背景下, 控制了断裂两侧沉积序列。断裂带挤压变形起始于中三叠世晚期的印支运动时期, 强烈变形发生在晚侏罗世早燕山运动时期, 与华南地块的向西挤压有关。Abstract: The Wei-Zi-Luo fault develops in southwestern margin of the Yangtze block. This is a deep crustal fault zone and controls the deposition and deformation styles of the region. Based on detailed field observations, fluid inclusion analysis and temperature measurements, and using cross section balance, this paper describes structural texture and segmentation feature of the fault zone and discusses its tectonic evolution. The results show that the Wei-Zi-Luo fault zone consists of several segments with kinematics dominated by reverse and sinistral strike-slip motion.Fluid inclusion analysis indicates brittle environment of deformation occurring in the upper crust, with temperature less than 200 ℃. Restoration of cross section shows that this fault zone was under extension during the Early Devonian to Middle Triassic, which controlled the depositional sequence of the region. It was deformed during the Indosinian orogen at the end of Triassic. The major deformation phase, related to westward push of the South China Block, occurred in Late Jurassic to Early Cretaceous.
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图 2 威-紫-罗断裂带空间结构分段示意图
1.威宁-水城段; 2.小河边-关岭段; 3.紫云-罗甸段; 4.南丹断裂; 5.宜州断裂
Figure 2. Schematic map showing segmentation of the Wei-Zi-Luo fault zone
图 3 贵州威宁-垭都实测构造剖面图（PM01)(剖面位置见图 1)
1.泥岩；2.粉砂质泥岩；3.泥质粉砂岩；4.粉砂岩；5.钙质粉砂岩；6.长石砂岩；7.长石石英砂岩；8.含铁石英砂岩；9.石灰岩；10.砂质灰岩；11;白云质灰岩；12.条带状燧石灰岩；13.瘤状灰岩；14.泥灰岩；15.白云岩；16.灰质白云岩；17.逆断层；18.正断层
Figure 3. Structural section of Weining - Yadu, Guizhou Province (PM01) (see Fig.l for location)
图 4 贵州关岭实测构造剖面图（PM02)(剖面位置见图 1)
1.页岩；2.泥岩；3.粉砂质泥岩；4.泥质粉砂岩；5.粉砂岩；6.石灰岩；7.砂质灰岩；8.泥灰岩；9.白云岩；10.碎裂岩化带；11.角砾岩化带；12.节理化带；13.逆断层；14.正断层
Figure 4. Structural section of Guanling, Guizhou Province (PM02)
图 5 贵州罗甸沫阳实测构造基干剖面(PM03)(剖面位置见图 1)
1.泥岩; 2.粉砂质泥岩; 3.泥质粉砂岩; 4.粉砂岩; 5.石灰岩; 6.泥灰岩; 7.瘤状灰岩; 8.条带状燧石灰岩; 9.竹叶状灰岩; 10.硅质岩; 11.角砾岩化带; 12.逆断层; 13.正断层
Figure 5. Structural section of Luodian-Moyang, Guizhou Province (PM03)
图 6 威-紫-罗断裂带断裂结构模式图
1.角砾岩带; 2.碎裂岩化带; 3.节理破碎带; 4.方解石脉体带; 5.牵引褶皱带; 6.构造透镜体带; 7.劈理化带; 8.逆断层; 9.正断层; 10.地名
Figure 6. Block diagram of the Wei-Zi-Luo fault zone
图 7 威紫罗断裂威宁-紫云段构造岩包裹体均一温度分布
Figure 7. Distribution of homogenized temperatures of fluid inclusions in the Weining-Ziyun section of Wei-Zi-Luo fault zone
图 8 威紫罗断裂紫云-罗甸段构造岩包裹体均一温度分布
Figure 8. Distribution of homogenized temperatures of fluid inclusions in the Ziyun-Luodian segment of the Wei-Zi-Luo fault zone
图 9 威紫罗断裂宜州-南丹段构造岩包裹体均一温度分布
Figure 9. Distribution of homogenized temperatures of fluid inclusions in the Yizhou-Nandan section of the Wei-Zi-Luo fault zone
图 10 贞丰-镇宁构造剖面复原图
Figure 10. Restoration of the structural section of the line Zhenfeng-Zhenning
表 1 威紫罗断裂带构造岩包裹体测试结果
Table 1. Result of fluid inclusion analysis in Wei-Zi-Luo fault zone
表 2 贞丰-镇宁剖面伸长量统计表
Table 2. I, e, β statistics of line Zhenfeng-Zhenning
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