RESEARCH ON THE MAJOR ACTIVE FAULTS IN ZHENJIANG, JIANGSU AND THEIR LATE QUATERNARY ACTIVITIES
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摘要: 镇江地区位于宁镇山脉东端，地质构造复杂，尤其断裂构造的活动性塑造了镇江地区如今的地形地貌格架。通过地质地貌调查、遥感影像解译、地球物理勘探、钻探、探槽等勘探手段，对镇江地区断裂构造两侧第四纪地层进行年代学研究，基本确定了断裂构造的活动机制、活动时间，结合镇江地区地震发生的规律及地应力场特征的研究，认为镇江地区断裂构造的最后活动时间在更新世，全新世活动较弱，并趋于稳定。Abstract: Combined with a series of measures from geophysical exploration, drilling and trench, through surveying the geomorphology and interpreting the remote sensing image at Zhenjiang, Jiangsu province, we discussed the age of Quaternary strata at both sides of Zhenjiang fault, then confirmed the activity mechanism and activity time of the fault. Research showed that the faults formed in different periods divided by directions include NE-NEE, NW, nearly EW, nearly NS and strike thrust (eversed) faults associated with fold, etc. Strike thrust (eversed) faults and early nearly EW trending faults formed in the late Indosinian to early Yanshanian fold orogenesis, NE-NNE trending and NW trending faults are the largest faults, formed mainly in Yanshan regional fault blockperiod. Nearly SN and late nearly EW trending tectonics controlled the spacial distribution of the Cenozoic sedimentary depression, which formed in late Yanshanianto Himalayan period. The faults that have inheritance activities include Mufushan-jiaoshan fault, Maoshan fault (belt) and fault along the river since the Quaternary, they are the main fault tectonics to Shape the modern landscape. Combining the regularity of seismic occurrence at Zhenjiang region with the charactristics of stress field, we consider the last activity time of the fault tectonics in Zhenjiang region is Pleistocene, activity is weak at Holocene, and then tends to be stable.
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图 1 镇江及邻近地区地震带分区图
Ⅱ－华南地震区; Ⅱ-1－长江中游地震带; Ⅲ－华北地震区; Ⅲ-1－长江下游-黄海地震带; Ⅲ-2－郯庐地震带; Ⅲ-3－华北平原地震带
Figure 1. Earthquake belts in Zhenjiang and adjacent areas
图 2 镇江地区及其外围地震震中分布图
Figure 2. Epicenter distribution of the earthquakes in Zhenjiang and adjacent areas
图 3 镇江地区主要断裂(含活动断裂)分布图
Figure 3. Distribution of the main faults (including active faults) in Zhenjiang area
图 4 幕府山—焦山断裂特征图片
Figure 4. Photos showing the characteristics of the Mifushan-Jiaoshan fault
图 5 幕府山—焦山断层(F11) 钻探联合地质剖面图(据江苏省地震工程研究院)
Figure 5. Drilling geological profiles in the Mufushan-Jiaoshan fault (F11)
图 8 重力布格异常等值线平面图及推测茅山断裂图
Figure 8. Gravity Bouguer anomaly contour map and inferred Maoshan fault
图 9 上党120线CSAMT反演电阻率断面及地质解译图
Figure 9. CSAMT inversion resistivity section and geological interpretation of Shangdang-120 Line
图 10 上会100线CSAMT反演电阻率断面及地质解译图
Figure 10. CSAMT inversion resistivity section and geological interpretation of Shanghui-100 Line
图 11 茅山断裂两侧钻孔联孔剖面第四系差异性沉积特征
Figure 11. Quaternary differential sedimentary characteristics of the drilling profiles in both sides of Maoshan fault
图 12 1:5万化极等值线推断断裂图
Figure 12. The inferred fault according to 1:50000 aeromagnetic anomaly contour
图 15 镇江新区大路镇1000 m深度电阻率切片图
Figure 15. A resistivity slice map in the depth of 1000 m in Dalu Town, Zhenjiang New Area
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