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前波断层是卡拉水电站工程区内规模最大的断裂构造,断层活动性研究对水电站建设有着重要的意义。通过野外地质调查发现:断层通过之处无动态构造地貌发育,断裂构造岩中的石英颗粒形态以深度溶蚀的桔皮状-苔藓状为主,ESR测年结果显示断层为晚更新世活动构造,而现场氡气测量显示断层的脉冲值峰值与本底值比值相对较大、愈合程度相对较弱,证明前波断层自全新世(Q4)以来已无活动痕迹,不属于活动构造,因此断层对工程建设影响不大。
The forewave fault is the largest fault structure in the engineering area of Kala Hydropower Station. The study of fault activity has important significance for the construction of hydropower station. Through the field geological survey, it is found that there is no dynamic tectonic landform where the fault passes, and the quartz grain morphology in the fault tectonic rocks is dominated by the orange peel-moss with deep erosion. ESR dating shows that the fault is a Late Pleistocene active structure, The on-site radon gas measurement shows that the ratio of the peak value to the background value of the fault is relatively large, and the healing degree is relatively weak. It proves that the fore-wave fault has no active traces since the Holocene (Q4) and does not belong to the active structure. Therefore, Project construction has little effect.