ACTIVITIES OF PALEOGENE FAULTS IN LANGGU SAG, JIZHONG DEPRESSION
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摘要: 采用断层落差法和生长指数法计算冀中坳陷廊固凹陷活动断层的古落差和生长指数，绘制了凹陷各地质历史时期的古落差和生长指数平面分布图，并详细分析了各时期断层活动特征。分析研究可知，一级控凹断层大兴断层的活动存在分段性，整体上表现为自南西到北东逐渐减弱；孔店—沙四期，三级活动性断层主要集中在凹陷的东南部，但活动都比较弱；沙三—沙二期，活动性断层的分布整体向凹陷北东方向扩展，三级以上断层活动比较强。研究结果表明，古近纪廊固凹陷断层活动主要受控于构造演化背景，大兴断层对次级断层活动具有重要的影响。Abstract: By calculating the fault throw index and growth index of the active faults in Langgu sag, Jizhong depression, the fault throw figures and fault growth index figures of this sag in each geological time were drawn out. Research showed that Daxing fault had different activities at different locations. The activity was weakened gradually from the southwest to the northeast as a whole. During the sedimentary period of Ek to Es4, the three-level active faults were mainly located in the southeastern part of the sag, and were active weakly. During the sedimentary period of Es3 to Es2, the distribution of active faults was gradually extended to northeast from the southeastern part of the sag, with intense faults activity. The results suggested that the activity of active faults in Paleogene was mainly controlled by structural evolution background, and the activity of other active faults was also influenced by Daxing Fault.
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Key words:
- Langgu Sag /
- Paleogene /
- fault activity /
- fault throw /
- growth index /
- genesis analysis
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图 2 廊固凹陷各级断层平面分布图
Figure 2. Planar distribution of the all levels of faults in Langgu Sag
图 3 大兴断层古近纪断层落差折线图
Figure 3. Broken line graph of Paleogene fault throw in Daxing Fault
图 4 廊固凹陷孔店—沙四期断层落差图
Figure 4. Fault throw figures during the sedimentary period of Ek to Es4 in Langgu Sag
图 5 廊固凹陷孔店—沙四期断层生长指数图
Figure 5. Fault growth index figures during the sedimentary period of Ek to Es4 in Langgu Sag
图 6 廊固凹陷沙三-沙二期断层落差图
Figure 6. Fault throw figures during the sedimentary period of Es3 to Es2 in Langgu Sag
图 7 廊固凹陷沙三—沙二期断层生长指数图
Figure 7. Fault growth index figures during the sedimentary period of Es3 to Es2 in Langgu Sag
表 1 廊固凹陷三级以上断层基本情况
Table 1. Basic information of the main faults in Langgu Sag
断层级别 断层名称 走向 倾向 活动时期 一级 大兴断层 NE SE Ek—Q 河西务断层 NE SE Es3晚—Q 二级 桐柏镇断层 NWW SSW Ek—Q 王居断层 NE NW Es3中—Q 杨税务断层 NE NW Es3早—Q 琥珀营断层 NE NW Es2—Q 三级 刘其营断层 NE SE Ek—Es4早 半截河断层 NE SE Ek—Es4晚 别古庄西断层 NE NW Es4早—Es4晚 安29断层(永清断层) NE NW Es4中—Es3中 安36井断层 NE SE Es4晚—Es3早 中岔口断层 NE NW Es3中—Es3晚 中岔口北断层 NE NW Es3中 
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