断层泥ESR测年在南方地区地震地质调查中的应用——以萧山—球川断裂(富阳—盐官段)为例
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摘要
由于南方地区断裂活动性弱且风化作用强烈,断层泥ESR测年在城市断层活动性调查中具有很好的应用前景。在杭州地区断裂活动性研究中,利用ESR方法直接测定断层泥年龄,来判断萧山—球川断裂的活动性。通过对断层泥ESR数据的分析,认为萧山—球川断裂富阳—盐官段最后一次强烈活动的时代可能发生于中更新世晚期,并以孝丰—三门湾断裂为界,具有很好的分段性。孝丰—三门湾断裂带以南段落的活动性可能比以北段落较强。
Direct ESR dating of fault gouge is a long-awaited assessment in seismic risk evaluation especially in the Southern part of China for fewer earthquakes and stronger weathering than the western part of China.In the research of fault activity in Hangzhou City,the assessment of direct ESR dating of fault gouge was used to estimate the Xiaoshan-Qiuchuan Fault(XQF) activity in Quaternary.The youngest age of(12.8±1.3)Ma indicates the last major faulting episode of the XQF.The data showed two subsection of the XQF with the Xiaofeng-Sanmenwan Fault(XSF) as its boundary.The Southwest section of XQF may have higher seismic risk than the northeast section.
Direct ESR dating of fault gouge is a long-awaited assessment in seismic risk evaluation especially in the Southern part of China for fewer earthquakes and stronger weathering than the western part of China.In the research of fault activity in Hangzhou City,the assessment of direct ESR dating of fault gouge was used to estimate the Xiaoshan-Qiuchuan Fault(XQF) activity in Quaternary.The youngest age of(12.8±1.3)Ma indicates the last major faulting episode of the XQF.The data showed two subsection of the XQF with the Xiaofeng-Sanmenwan Fault(XSF) as its boundary.The Southwest section of XQF may have higher seismic risk than the northeast section.
引文
[1]中国地震活动断层探测技术系统技术规程:JSGC-04.[S].北京:地震出版社,2005.
[2]朱金芳,徐锡伟,黄宗林,等,福州市活断层探测与地震危险性评价,中国城市活断层探测丛书[M].北京:科学出版社,2005.
[3]邓起东,徐锡伟,张先康,等,城市活动断裂探测的方法和技术[J].地学前缘,2003,10(1):93-103.
[4]业渝光.电子自旋共振(ESR)测年方法简介[J].中国地质,1992,(3):28-29.
[5]K.Tanaka,T.Shidahara,Fracturing,crushing andgrinding effects on ESR signal of quartz[M].ESRDating and Dosimetry(IONICS,Tokyo,1985).
[6]Ikeya M,Miki T,Tanaka K.Dating of a fault by ESRon intra fault material[J].Science,1982,215:1392-1393.
[7]Fukuchi T.ESR studies for absolute dating of faultmovements[J].Journal of the Geological Society ofLondon,1992,149:265-272.
[8]Toyoda S,Ikeya M.Thermal stabilities of paramag-netic defect and impurity centres in quartz:basis forESR dating of thermal history[J].Geochemical Jour-nal,1991,25:437-445.
[9]Tanaka H,Hinoki S,Kosaka K,Lin A.TakemuraK,Murata A,Miyata T.Deformation mechanismand fluid behaviour in a shallow,brittol fault zoneduring coseismic and interseismic periods:resultsfrom drill core penetrating the Nojima Fault[J].Ja-pan.Island Arc,2001,10(3/4):381-391.
[10]Tatsuro Fukuchi.Assessment of fault activity byESR dating of fault gouge;an example of the 500 mcore samples drilled into the Nojima earthquakefault in Japan[J].Quaternary Science Reviews2001,20:1005-1008.
[11]孙瑛杰,卢演俦,尹功明,沂沭断裂带大水场剖面断层泥的ESR年代学研究[J].地震地质,1999,21(4):346-350.
[12]叶建青,城市活断层研究与浙江省的城市化建设[J].上海地质,2001,4:31-33.
[13]Anne R Skinner.ESR dating:is it still an‘experi-mental’technique?[J].Applied Radiation and Iso-topes 2000,52:1311-1316.
[14]Fukuchi T.Quartet ESR signals detected from nat-ural clay minerals and their applicability to radiationdosimetry and dating[J].Japanese Journal of Ap-plied Physics,1996 a.35:1977-1982.
[15]Fukuchi T.Direct ESR dating of fault gouge usingclay minerals and the assessment of fault activity[J].Engineering Geology,1996 b,43:201-211.
[16]Fukuchi T,Imai N.ESR isochron dating of the No-jima Fault Gouge,Southwest Japan,using ICP-MS;an approach to fluid flow events in the fault zone[C]//Parnell,J.Dating and Duration of Fluid Flowand Fluid-Rock Ineraction,Geological Society,Lon-don Special Publication,1998,144:261-277.
[17]Fukuchi T,Imai N.ESR and ICP analyses of theOgura 500 m core samples drilled into the NojimaFault[C]//Japan:Evidence for hot fluids throughthe fault plane.The Island Arc(in review),1999.
[18]杨坤光,梁兴中,谢建磊,ESR定年:一种确定脆性断层活动年龄的方法原理与应用[J].地球科学进展,2006,21(4):430-435.
[2]朱金芳,徐锡伟,黄宗林,等,福州市活断层探测与地震危险性评价,中国城市活断层探测丛书[M].北京:科学出版社,2005.
[3]邓起东,徐锡伟,张先康,等,城市活动断裂探测的方法和技术[J].地学前缘,2003,10(1):93-103.
[4]业渝光.电子自旋共振(ESR)测年方法简介[J].中国地质,1992,(3):28-29.
[5]K.Tanaka,T.Shidahara,Fracturing,crushing andgrinding effects on ESR signal of quartz[M].ESRDating and Dosimetry(IONICS,Tokyo,1985).
[6]Ikeya M,Miki T,Tanaka K.Dating of a fault by ESRon intra fault material[J].Science,1982,215:1392-1393.
[7]Fukuchi T.ESR studies for absolute dating of faultmovements[J].Journal of the Geological Society ofLondon,1992,149:265-272.
[8]Toyoda S,Ikeya M.Thermal stabilities of paramag-netic defect and impurity centres in quartz:basis forESR dating of thermal history[J].Geochemical Jour-nal,1991,25:437-445.
[9]Tanaka H,Hinoki S,Kosaka K,Lin A.TakemuraK,Murata A,Miyata T.Deformation mechanismand fluid behaviour in a shallow,brittol fault zoneduring coseismic and interseismic periods:resultsfrom drill core penetrating the Nojima Fault[J].Ja-pan.Island Arc,2001,10(3/4):381-391.
[10]Tatsuro Fukuchi.Assessment of fault activity byESR dating of fault gouge;an example of the 500 mcore samples drilled into the Nojima earthquakefault in Japan[J].Quaternary Science Reviews2001,20:1005-1008.
[11]孙瑛杰,卢演俦,尹功明,沂沭断裂带大水场剖面断层泥的ESR年代学研究[J].地震地质,1999,21(4):346-350.
[12]叶建青,城市活断层研究与浙江省的城市化建设[J].上海地质,2001,4:31-33.
[13]Anne R Skinner.ESR dating:is it still an‘experi-mental’technique?[J].Applied Radiation and Iso-topes 2000,52:1311-1316.
[14]Fukuchi T.Quartet ESR signals detected from nat-ural clay minerals and their applicability to radiationdosimetry and dating[J].Japanese Journal of Ap-plied Physics,1996 a.35:1977-1982.
[15]Fukuchi T.Direct ESR dating of fault gouge usingclay minerals and the assessment of fault activity[J].Engineering Geology,1996 b,43:201-211.
[16]Fukuchi T,Imai N.ESR isochron dating of the No-jima Fault Gouge,Southwest Japan,using ICP-MS;an approach to fluid flow events in the fault zone[C]//Parnell,J.Dating and Duration of Fluid Flowand Fluid-Rock Ineraction,Geological Society,Lon-don Special Publication,1998,144:261-277.
[17]Fukuchi T,Imai N.ESR and ICP analyses of theOgura 500 m core samples drilled into the NojimaFault[C]//Japan:Evidence for hot fluids throughthe fault plane.The Island Arc(in review),1999.
[18]杨坤光,梁兴中,谢建磊,ESR定年:一种确定脆性断层活动年龄的方法原理与应用[J].地球科学进展,2006,21(4):430-435.
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