兰州市刘家堡隐伏断层的地球化学探测方法试验
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摘要
应用JM-4数字金膜测汞仪和FD-3017RaA测氡仪,分别对兰州市刘家堡隐伏断层孔家崖地段处的土壤气汞、气氡进行场地观测试验,并通过对汞、氡地球化学变化特征的研究,证实了兰州刘家堡隐伏断层在该地段处的存在性,同时也证实了以往地质工作者对兰州刘家堡隐伏断层位置展布的推测,并结合相关理论,初步确定了该区段断层的具体位置,进而推断出该断层的走向与倾角。试验结果相继得到钻孔、电法等多种手段的验证,利用不同手段所得的结果都能较好地吻合。试验表明:利用土壤气汞和氡地球化学探测手段对断层活动性研究以及对寻找隐伏断层具有相当的可行性和重要性。
Radon and mercury in soil gas were monitored in the field by using JM-4 gold membrane mercury analyzer and FD-3017 radon detector at Kongjia'ai section of Liujiapu fault in Lanzhou city.The geochemical characters of radon and mercury in soil gas were analyzed.The result shows that the Liujiapu buried fault really exists at Kongjia'ai section.Thus,the assumption of some geologists about the Liujiapu buried fault location is confirmed.The exactly location of the fault in this section and its trend and obliquity are also ascertained according to correlative theory.The test result above is validated by other methods such as drilling and electric prospecting.The test accounts for that the explore of soil gas Rn and Hg is a useful method for researching active faults and looking for buried faults.
Radon and mercury in soil gas were monitored in the field by using JM-4 gold membrane mercury analyzer and FD-3017 radon detector at Kongjia'ai section of Liujiapu fault in Lanzhou city.The geochemical characters of radon and mercury in soil gas were analyzed.The result shows that the Liujiapu buried fault really exists at Kongjia'ai section.Thus,the assumption of some geologists about the Liujiapu buried fault location is confirmed.The exactly location of the fault in this section and its trend and obliquity are also ascertained according to correlative theory.The test result above is validated by other methods such as drilling and electric prospecting.The test accounts for that the explore of soil gas Rn and Hg is a useful method for researching active faults and looking for buried faults.
引文
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[2] 卫敬生.地球化学测汞方法应用讨论[J].物探与化探,1998,22(6):21～27.
[3] 孟广魁,何开明,等.氡、汞测量用于断裂活动性和分段的研究[J].中国地震,1997,13(1):43～51.
[4] 韩许恒,郁春霞.氡射气测量在西安地裂缝勘察中的应用研究[J].工程地质学报,1997,5(1):65～71.
[5] 吴慧山,等.氡的测量方法与应用[M].北京:原子能出版社,1995.08.55～67.
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