东大别地磁剖面磁异常的匹配滤波分析与地震研究
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摘要
利用匹配滤波方法对东大别造山带内的六安—英山、白塔畈—无为、金寨青山—万佛湖三条地磁剖面异常数据进行局部与区域异常场分离;基于区域异常场分离结果利用近似线性反演方法对各剖面的居里面埋深进行了定量计算;并结合构造及地震资料对东大别造山带内的地震活动与居里面的关系及其地震成因机制进行了初步研究。结果表明:剖面磁异常曲线较好地反应出研究区构造基底性质之间的差异性,与居里面埋深呈现出较好的镜像关系;居里面的起伏较大约为14km,埋深最浅处位于霍山地区;地震空间分布与居里面相关,主要发生在居里面的梯度带上;居里面梯度带之间的温度差异形成的热应力可能是霍山地区地震发生的直接动力源。居里面反演结果也为晓天—磨子潭断裂下方莫霍面垂向错断提供了证据。
Using matched-filter method,the geomagnetic anomaly data from profiles of Luan-Yingshan(Ⅰ),Baitafan-Wuwei(Ⅱ) and Jinzhaiqingshan-Wanfuhu(Ⅲ) in Eastern Dabie Orogenic belt are processed,the local anomalous field is extracted from regional field.Based on regional anomalous field,the buried depth of Curie surface along profiles are calculated using the approximate linear invertion method.Combined with the geological results and earthquakes distribution in this area,the relations between seismic activity and Curie surfaces,and the seismogenesis mechanism are researched preliminarily.The results show that the curves of geomagnetic anomaly exhibit the various characteristics and differences of structural basements of different profiles,existing apparent mirror image relationship with the depth of Curie surfaces.Fluctuation of Curie surface in the area is about 14 km,the lowest position is at Huoshan,where is the intersection part of profile Ⅰ and Ⅲ.The corresponding relation between earthquakes distribution and Curie surface is apparent,most earthquakes occur on gradient zone of Curie surface.Thermal stress generated from temperature difference of gradient zone might be direct dynamic sources of Houshan area.The invertion result of Curie surface provide proof for offset on Moho along Xiaotian-Muzitan Fault.
Using matched-filter method,the geomagnetic anomaly data from profiles of Luan-Yingshan(Ⅰ),Baitafan-Wuwei(Ⅱ) and Jinzhaiqingshan-Wanfuhu(Ⅲ) in Eastern Dabie Orogenic belt are processed,the local anomalous field is extracted from regional field.Based on regional anomalous field,the buried depth of Curie surface along profiles are calculated using the approximate linear invertion method.Combined with the geological results and earthquakes distribution in this area,the relations between seismic activity and Curie surfaces,and the seismogenesis mechanism are researched preliminarily.The results show that the curves of geomagnetic anomaly exhibit the various characteristics and differences of structural basements of different profiles,existing apparent mirror image relationship with the depth of Curie surfaces.Fluctuation of Curie surface in the area is about 14 km,the lowest position is at Huoshan,where is the intersection part of profile Ⅰ and Ⅲ.The corresponding relation between earthquakes distribution and Curie surface is apparent,most earthquakes occur on gradient zone of Curie surface.Thermal stress generated from temperature difference of gradient zone might be direct dynamic sources of Houshan area.The invertion result of Curie surface provide proof for offset on Moho along Xiaotian-Muzitan Fault.
引文
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[2]路凤香,张本仁,韩吟文,等.秦岭—大别—苏鲁地区岩石圈三维化学结构特征[M].北京:地质出版,2006:1-4.
[3]江来利,吴维平,储东如.大别造山带东段扬子陆块和华北陆块间缝合带的位置[J].地球科学-中国地质大学学报,2005,30(3):264-273.
[4]WANG Xiaomin,Liu J G,Mao H K.Coesite-bearing eclogitefrom Dabie Mountains in central China[J].Geology,1989,17:1085-1088.
[5]XU Shutong,Okay A I,Ji Shouyuan,et a1.Diamonds fromDabieShan metamorphic rocks an d its implication for tectonicsetting[J].Science,1992,256:80-82.
[6]Okay A l,Sengor A M C.Evidence for intracontinental thrust-related exhumation of the ultra-high pressure rocks in Chi-na[J].Geology,1992,20(5):411.
[7]徐树桐,江来利,刘贻灿,等.大别山区(安徽部分)的构造格局和演化过程[J].地质学报,1992,66(1):1-15.
[8]从柏林,王清晨.大别山—苏鲁超高压变质带研展[J].科学通报,1999,44(11):1127-1141.
[9]刘若新,樊祺诚,李惠民,等.大别山碧溪岭石榴橄榄岩-榴辉岩体的原岩性质及同位素年代学的启示[J].岩石学报,1995,11(3):243-256.
[10]徐树桐,苏文,刘怡灿,等.大别山北部榴辉岩的发现及其岩相学特征[J].科学通报,1999,44(13):1452-1456.
[11]张本仁,张宏飞,高山.大别造山带现今地壳结构-岩石组成研究[J].矿物岩石地球化学通报,2004,23(3):187-193.
[12]李曙光.大陆俯冲化学地球动力学[J].地学前缘,1998,5(4):211-230.
[13]董树文,孙先如,张勇,等.大别山碰撞造山带基本结构[J].科学通报,1993,38(6):542-545.
[14]王椿镛,张先康,陈步云,等.大别造山带的地壳结构研究[J].中国科学(D),1997,27(3):221-226.
[15]董树文,吴宣志,高锐,等.大别造山带地壳速度结构与动力学[J].地球物理学报,1998,41(3):349-361.
[16]杨文采.东大别超高压变质带的深部构造[J].中国科学(D),2003,33(2):183-194.
[17]刘福田,徐佩芬,刘劲松,等.大陆深俯冲带的地壳速度结构——东大别造山带深地震宽角反射P波折射研究[J].地球物理学报,2003,46(3):366-372.
[18]赵志新,徐纪人,许志琴.上地幔三维S波速度结构与大别苏鲁超高压变质带俯冲折返机制探讨[J].岩石学报,2004,20(1):157-164.
[19]徐树桐,袁学诚,吴维平,等.大别山黄石六安反射地震剖面新的地质解释[J].地质通报,2008,27(1):19-26.
[20]肖骑彬,赵国泽,詹艳,等.大别山超高压变质带深部电性结构及其动力学意义初步研究[J].地球物理学报,2007,50(3):812-822.
[21]杨文采,方慧,程振炎,等.苏鲁超高压变质带北部地球物理调查(Ⅱ)——非地震方法[J].地球物理学报,1999,42(4):508-519.
[22]徐如刚,张毅,顾春雷,等.九江—瑞昌MS5.7地震前后地磁场水平分量异常追踪与分析[J].地球物理学进展,2010,25(4):1175-1179.
[23]穆石敏,申宁华,孙运生.区域地球物理数据处理方法及其应用[M].长春:吉林科学技术出版社,1990.
[24]刘天佑.重磁勘探软件手册GMS3.0方法原理[M].武汉:中国地质大学出版社,2009:80-84.
[25]管志宁,郝天珧,姚长利.21世纪重力与磁法勘探[J].地球物理学进展,2002,17(2):237-244.
[26]张先,刘敏,赵丽,等.华北地区壳内磁性构造与地震的探讨[J].地震,2000,20(4):50-356.
[27]邵世德,严晓红.安徽省及邻区居里面的地质分析[J].合肥工业大学学报,1992,15(2):100-105.
[28]黄兆熊,高德章.上海及其邻域居里面与地震活动趋势[J].地震学报,1992,14(3):363-365.
[29]郭增建,秦保燕.震源物理[M].北京:地震出版社,1979,35-52.
[30]郝书俭,高华根,王春华.京津唐地区居里等温面及其与地震的关系[J].地球物理学报,1982,25(3):264-269.
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