利用1∶20万区域重力资料研究宁夏断裂体系
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摘要
宁夏大面积为新生界地层覆盖,构造格架的划定一直是本区研究的难点。对比了边界识别的五种常用方法(垂向二阶导数、总水平导数、水平一阶方向导数、斜导数与小波变换),首先分别利用五种方法对全区断裂进行系统独立划定,再对比五种方法独立划定结果,最后综合得出全区断裂构体系。结果表明,重新划定的宁夏全区断裂体系为以后在该区进一步研究活动断层与城市安全、区域与深部构造及其成矿作用提供了新的基础资料。
Ningxia is covered by a large area of the Cenozoic strata,and the delineation of tectonic frames has been a difficult problem in the area.This paper compares five common methods of edge detection(second-order vertical derivative,total horizontal derivative,first-order horizontal derivative,tilt derivative and wavelet analysis).First,these five methods are used to delineate faults systematically and independently in the whole area Then,the five results which are inferred from the above methods are compared.Finally,the re-evaluated fault system can be put forward under comprehensive considerations.The new fault system in Ningxia area provides new elementary materials that can be used to study active faults,city safety,regional and deep structures,andtheir mineralization.
Ningxia is covered by a large area of the Cenozoic strata,and the delineation of tectonic frames has been a difficult problem in the area.This paper compares five common methods of edge detection(second-order vertical derivative,total horizontal derivative,first-order horizontal derivative,tilt derivative and wavelet analysis).First,these five methods are used to delineate faults systematically and independently in the whole area Then,the five results which are inferred from the above methods are compared.Finally,the re-evaluated fault system can be put forward under comprehensive considerations.The new fault system in Ningxia area provides new elementary materials that can be used to study active faults,city safety,regional and deep structures,andtheir mineralization.
引文
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[2]钟清.区域重力资料在地质填图中的边界定位问题研究[D].北京:中国地质大学,2006.
[3]钟清,孟小红,刘士毅.重力资料定位地质体边界问题的探讨[J].物探化探计算技术,2007,29(增刊):35-38.
[4]Cordell L.Gravimetic expression of graben faulting in Santa Fe country and Espanola basin[J].New Mexico GeolSoc Guidenbook,30th Field Conf,1979:59-64.
[5]Fedi M.Florio G.Detection of potential fields source boundaries by enhanced horizontal derivative method[J].Geophysical Prospecting,2001,49(1):40-58.
[6]Wang Wanyin,PanYu,Qiu Zhiyun.A new edge recognition technology based on the normalized vertical derivative of the total horizontal derivative for potential field data[J].Applied Geophysics,2009,6(3):226-233.
[7]胡中栋,余钦范,楼海.三维解析信号法[J].物探化探计算技术,1995,17(3):36-42.
[8]刘义波,曾昭发,陈雄,等.解析信号和水平导数法超贫铁矿磁探测——以内蒙古凉城铁矿为例[J].世界地质,2013,32(4):839-846.
[9]秦葆瑚.用解析信号计算倾角异常[J].物探化探计算技术,1998,20(3):261-266.
[10]张季生.用三维解析信号技术处理化南航磁异常[J].物探与化探,2000,24(3):190-196.
[11]王万银.位场解析信号振幅极值位置空间变化规律研究[J].地球物理学报,2012,55(4):1 288-1 299.
[12]李卓聪.斜导数方法研究及其在道郎和都格矿区重力资料解释中的应用[D].吉林:吉林大学,2009.
[13]郭华,于长春,吴燕冈.改进的斜导数方法及应用[J].物探与化探,2009,33(2):212-216.
[14]杨建国.小波分析及其工程应用[M].北京:机械工业出版社,2005.
[15]Meyer Y.Waveletand applications[M].Philadephia:SIAM,1993.
[16]DaubechiesI.The Wavelet Transform,time-frequency localization and signal analysis[J].IEEE Transaction on Information Theory,1990,36:961-1 005.
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