龙泉山断裂带隐伏断层氡气特征及其活动性分析
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摘要
龙泉山断裂构造带作为龙门山推覆带的前陆隆起,严格控制了成都平原东边界,其活动性历来受到人们的关注。通过对龙泉山断裂带的氡气进行测量,可以有效地判断隐伏断层的位置及其活动性。测量结果显示,龙泉山断裂带北段东坡活动性强于西坡,主断层的活动性明显强于边缘隐伏断层,4条断层的活动性由强到弱依次为合兴场断层>红花塘断层>龙泉驿断层>松林场断层。龙泉山断裂带同一条断层在地表由多个破碎带组成,其氡气异常特征与断层活动性和破碎带特征呈正相关性,即断层活动性越强,氡气异常特征越显著。龙泉山断裂带氡气平均异常浓度是背景值的9.6倍,将各异常带峰值浓度与背景值进行对比分析,大致归纳出了龙泉山地区隐伏断层活动性的相对判别标准。
The Longquanshan fault zone as the foreland uplift of the Longmenshan nappe zone lies at the eastern boundary of the Chengdu plain, and has long been studied by the geologists concerning the activity of the faults in this zone. The measurement of the soil gas radon may be applied to determine the location and activity of the hidden faults. The measurements of radon in this paper show that there occurs stronger fault activity on the eastern slope than on the western slope, and in the major faults than in the surrounding hidden faults in the northern part of the Longquanshan fault zone. There is a positive correlation between the radon anomaly and fault activity. The average radon concentrations within the Longquanshan fault zone are generally 9.6 times higher than the background values in this area. On the whole, the Longquanshan fault zone is a slightly active to moderately active fault zone.
The Longquanshan fault zone as the foreland uplift of the Longmenshan nappe zone lies at the eastern boundary of the Chengdu plain, and has long been studied by the geologists concerning the activity of the faults in this zone. The measurement of the soil gas radon may be applied to determine the location and activity of the hidden faults. The measurements of radon in this paper show that there occurs stronger fault activity on the eastern slope than on the western slope, and in the major faults than in the surrounding hidden faults in the northern part of the Longquanshan fault zone. There is a positive correlation between the radon anomaly and fault activity. The average radon concentrations within the Longquanshan fault zone are generally 9.6 times higher than the background values in this area. On the whole, the Longquanshan fault zone is a slightly active to moderately active fault zone.
引文
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[13] 孟晓捷,王根龙,张茂省,等.土壤氡气测量在活动断裂探测中的应用——以大西安西咸新区为例[J].西北地质,2016,(3):175-186.
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[15] 王志成.土氡测量在海口市活动断层探测中的初步应用[J].华南地震,2006,26(4):61-66.
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[20] 邓起东,陈社发,赵小麟,等.龙门山及其邻区的构造和地震活动及动力学[J].地震地质,1994,16(4):389-403.
[21] 孟广魁,何开明,班铁,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.
[22] 王运生,测氡在区域构造稳定性研究中的应用—以滇西北北部区域构造稳定性研究为例[J].山地学报,2002,20(4):505-508.
[23] 张骏,高秀君,等.霍州矿区隐伏断裂(带)活动性氡气测试成果解释分析[J].高原地震,2000,12(1):16-20.
[24] 王诗东,庹先国,李怀良,等,氡气测量法高密度电法在断层定位中的应用[J].地学前缘,2011,18(2):315-320.
[25] 张平安,东莞某工程场地隐伏断裂a卡氡气勘查技术应用[J].西部探矿工程,2006,(4):118-120.
[2] 徐水森,任寰,宋杰.龙泉山断裂带地震活动性浅析[J].四川地震,2006,(2):21-27.
[3] 王伟涛,等.四川龙泉山断裂带变形特征及其活动性初步研究[J].地震地质,2008,30(4):969-973.
[4] 董顺利,李勇,乔宝成,等.汶川特大地震后成都盆地内隐伏断层活动性分析[J].沉积与特提斯地质,2008,28(3):1-7.
[5] 高尚华,佘雅文,付广裕.利用重力/GPS联合观测数据计算地壳垂向构造应力的新方法[J].地球物理学报,2016,59(6):2006-2013.
[6] Shao Y,Yang X,Li Y.Measurement and result of soil gas radon and soil gas mercury in the exploration of Haihe hidden fault[J].中国地震研究(英文版),2008,22(2):185-194.
[7] Lazaromancilla O,Lopez D L,Reyeslopez J A,et al.222Radon Concentration Measurements biased to Cerro Prieto Fault for Verify its Continuity to the Northwest of the Mexicali Valley.[C]// Agu Spring Meeting.2009.
[8] Seminsky K Z,Bobrov A A,Demberel S.Variations in radon activity in the crustal fault zones:Spatial characteristics[J].Izvestiya Physics of the Solid Earth,2014,50(6):795-813.
[9] Ioannides K,Papachristodoulou C,Stamoulis K,et al.Soil gas radon:a tool for exploring active fault zones[J].Applied Radiation & Isotopes,2003,59(2):205-213.
[10] King C Y.Radon emanation on San Andreas Fault [J].Nature,1978,271:516～519.
[11] King C Y.Episodic radon changes in subsurface soil gas along active faults and possible relation to earthquakes [J].J.Geophys.Res.,1980,85(B6):3065-3078.
[12] 汪成民,李宣珊等.断层气测量在地震科学中的应用[M].北京:地震出版社,1991.1-197.
[13] 孟晓捷,王根龙,张茂省,等.土壤氡气测量在活动断裂探测中的应用——以大西安西咸新区为例[J].西北地质,2016,(3):175-186.
[14] 宇文欣,简春林,朱自强.断裂逸出氡震前异常变化与地震对应关系的初步研究[M].北京:地震出版社,1995.173-179.
[15] 王志成.土氡测量在海口市活动断层探测中的初步应用[J].华南地震,2006,26(4):61-66.
[16] 魏树群,李炜.测氡法探测煤矿地质构造的研究[J].核电子学与探测技术,1993,13(4):309-313.
[17] 陈社发,邓起东,赵小麟,等.龙门山中段推覆构造带及相关构造的演化历史和变形机制(二)[J].地震地质,1994,16(4):413-421.
[18] 李勇,曾允孚.龙门山逆冲推覆作用的地层标识[J].成都理工大学学报(自然科学版),1995,(2):1-10.
[19] 刘树根,罗志立,赵锡奎,等.中国西部盆山系统的耦合关系及其动力学模式—以龙门山造山带—川西前陆盆地系统为例[J].地质学报,2003,77(2):177-186.
[20] 邓起东,陈社发,赵小麟,等.龙门山及其邻区的构造和地震活动及动力学[J].地震地质,1994,16(4):389-403.
[21] 孟广魁,何开明,班铁,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.
[22] 王运生,测氡在区域构造稳定性研究中的应用—以滇西北北部区域构造稳定性研究为例[J].山地学报,2002,20(4):505-508.
[23] 张骏,高秀君,等.霍州矿区隐伏断裂(带)活动性氡气测试成果解释分析[J].高原地震,2000,12(1):16-20.
[24] 王诗东,庹先国,李怀良,等,氡气测量法高密度电法在断层定位中的应用[J].地学前缘,2011,18(2):315-320.
[25] 张平安,东莞某工程场地隐伏断裂a卡氡气勘查技术应用[J].西部探矿工程,2006,(4):118-120.