基于重磁多尺度边缘检测的长江中下游成矿带构造格架研究
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摘要
采用重磁多尺度边缘检测方法,对长江中下游成矿带区域重力和航磁数据进行了边缘检测,结合大地电磁剖面和地质资料,建立了长江中下游地区构造格架。根据重磁多尺度边缘检测结果,重新厘定了断裂系统的展布位置,确定了宁芜、庐枞等火山岩盆地的准确边界,划分了板块、火山岩盆地等横向结构的边界。认为长江深断裂沿安庆—铜陵北—芜湖—马鞍山—南京一线连续分布,在南京附近走向转换为近东西向,到镇江后一直往东延续至南通,进一步向东延续进入东海;长江南侧未见与郯庐断裂带连接的密度或磁性线状边界,认为郯庐断裂带穿过长江的可能性较小。在此基础上,分析了长江中下游成矿带主要矿集区与构造格架的关系,认为长江深断裂是地幔上涌引起的裂谷型断裂,来自下地壳或地幔的深部矿源物质通过深断裂向上运移,在合适的位置形成目前所见的金属矿集区。大别-舟山断裂将长江深断裂在铜陵一带错断,形成深大断裂的交汇,对铜陵、庐枞、宁芜矿集区的形成有重要贡献。
The tectonic framework of the Middle and Lower Reaches of the Yangtze River was established based on multi-scale edge detection using regional magnetic and gravimetric data and integrated with analysis of magnetotelluric profiling and geological information.According to gravity and magnetic multi-scale edge detection,the distribution and location of the fault system was redefined,the exact boundary of volcanic basin such as Nanjing-Wuhu and Lujiang-Zongyang ,etc were confirmed,and the plate border were also devised.We consider that the extending to the east of the Yangtze fault zone and its continuation pass through Anqing,north of Tongling,Wuhu,Maanshan,Nanjing,Zhenjiang,Nantong and sea waters of eastern the East China Sea.There is less possibility that Tanlu fault zone traverse of Yangtze River because the linear boundary of gravity and magnetism is not found.Considering the relationship between ore-concentrating district and tectonic framework of the Middle and Lower Reach of the Yangtze River,we consider that the deep fracture of Yangtze River is caused by the upwarping of mantle.The metallic ore-concentrating district comprises mineral resources that was migrated upwards along deep faults from lower crust or mantle.The fracture of Yangtze River has been broken at Tongling by the fault of Dabie-Zhoushan.It plays an important role in the formation of Tongling,Luzhong,Ningwu ore districts.
The tectonic framework of the Middle and Lower Reaches of the Yangtze River was established based on multi-scale edge detection using regional magnetic and gravimetric data and integrated with analysis of magnetotelluric profiling and geological information.According to gravity and magnetic multi-scale edge detection,the distribution and location of the fault system was redefined,the exact boundary of volcanic basin such as Nanjing-Wuhu and Lujiang-Zongyang ,etc were confirmed,and the plate border were also devised.We consider that the extending to the east of the Yangtze fault zone and its continuation pass through Anqing,north of Tongling,Wuhu,Maanshan,Nanjing,Zhenjiang,Nantong and sea waters of eastern the East China Sea.There is less possibility that Tanlu fault zone traverse of Yangtze River because the linear boundary of gravity and magnetism is not found.Considering the relationship between ore-concentrating district and tectonic framework of the Middle and Lower Reach of the Yangtze River,we consider that the deep fracture of Yangtze River is caused by the upwarping of mantle.The metallic ore-concentrating district comprises mineral resources that was migrated upwards along deep faults from lower crust or mantle.The fracture of Yangtze River has been broken at Tongling by the fault of Dabie-Zhoushan.It plays an important role in the formation of Tongling,Luzhong,Ningwu ore districts.
引文
①数据源自国土资源部航空物探遥感中心.
常印佛,刘湘培,吴言昌.1991.长江中下游铜铁成矿带.北京:地质出版社,1~325.
管烨.2005.云南三江地区地壳三维构造与矿集区关系研究.中国地质科学院博士论文.
侯明金,朱光,Jacques Mercier.2007.郯庐断裂带(安徽段)及邻区的动力学分析与区域构造演化.地质科学,42(2):362~381.
刘光鼎,郝天珧.1998.中国的地质环境与隐伏矿床.地球物理学报,41(2):182~188.
刘光鼎,郝天珧,刘伊克.1997.中国大地构造宏观格架及其矿产资源的关系.科学通报,42:2.
刘金兰,李庆春,赵斌.2007.位场场源边界识别新技术及其在山西古构造带与断裂探测中的应用研究.工程地质学报,15(4):213~217.
刘湘培,常印佛,吴言昌.1988.论长江中下游地区成矿条件和成矿规律.地质学报,2:167~177.
秦大正,刘昌森,丁项华.1983.长江断裂带东延问题及裂谷特性的讨论.地震地质,3(2):69~73.
孙文珂,黄宗轲,丁鹏飞.2001.重点成矿区带的区域构造和成矿构造文集.北京:地质出版社,1~20.
唐永成,吴言昌,储国正,等.1998.安徽沿江地区铜多金属矿产地质.北京:地质出版社,10~11.
汤加富.2003.大别山及邻区地质构造特征与形成演化:地幔差速环流与陆内多期造山.北京:地质出版社,36~40.
涂广红,江为为,朱东英.2006.中国东北地区剩余重磁异常特征与地质构造及成矿带的关系.地球物理学进展,21(3):746~755.
王京彬.1991.中国东部郯庐断裂南延新解.大地构造与成矿学,170~176.
吴根耀,梁兴,陈焕疆.2007.试论郯城-庐江断裂带的形成、演化及其性质.地质科学,42(1):160~175.
禹尧,徐夕生.2009.长江中下游地区白垩纪富碱火山岩浆作用地球科学,34(1):105~116.
裴荣富,熊群尧.1999.中国特大型金属矿床成矿偏在性与成矿构造聚敛(场).矿床地质,18(1):37~45.
严加永.2010.长江中下游成矿带深部背景综合地球物理研究.中国科学院博士论文.
张季生.2006.位场自动反演技术的研究现状及意义.地球学报,27(6):609~612.
Archibald N,GowP,Boschetti F.1999.Multiscale edge analysis of potential field data.Explore Geophys,30:38~44.
Austin J R,Blenkinsop T G.2008.The Cloncurry Lineament:Geophysical and geological evidence for a deep crustal structurein the Eastern Succession of the Mount Isa Inlier.PrecambrianResearch,163:50~68.
Cordell,Lindrith.1979.Gravi metric expression of graben faultingin Santa Fe County and the Espanola basin,New Mexico:NewMexico Geological Guidebook,30th Field Conference,Santa FeCounty,59~64.
Holden D J,Archibald N J,Boschetti F,Jessell M W,2000.Inferring geological structures using wavelet-based multiscaleedge analysis and forward models.(in Exploration beyond2000;conference handbook)Preview84,97.
Hornby P,Boschetti F,Horowitz F G.1999.Analysis of potentialfield data in the wavelet domain.Geophys,137,175~196.
Horowitz,Hornby,Boschetti.2000.Developments in the analysisof potential field data via multiscale edge representation.(inExploration beyond2000;conference handbook)Preview,84,77.
Miller H G,Singh V.1994.Potential field tilt-A newconcepet forlocation of potential field source.Journal of AppliedGeophysics,32(3):213~217.
Murphy F C.2005.Composition of multi-scale wavelets(WORMS)in the potential field of the Mt Isa region.I2+3final report,pmdCRC,243~259.
Verduzco B,Fairhead J D,Green C M,et.al.2004.Newinsightsinto magnetic derivatives for structural mapping.The leadingedge,23:116~119.
Wijns C,Perez C,Kowalczyk P.2005.Theta map:Edge detectionin magnetic data.Geophysics,70(4):39~43.
常印佛,刘湘培,吴言昌.1991.长江中下游铜铁成矿带.北京:地质出版社,1~325.
管烨.2005.云南三江地区地壳三维构造与矿集区关系研究.中国地质科学院博士论文.
侯明金,朱光,Jacques Mercier.2007.郯庐断裂带(安徽段)及邻区的动力学分析与区域构造演化.地质科学,42(2):362~381.
刘光鼎,郝天珧.1998.中国的地质环境与隐伏矿床.地球物理学报,41(2):182~188.
刘光鼎,郝天珧,刘伊克.1997.中国大地构造宏观格架及其矿产资源的关系.科学通报,42:2.
刘金兰,李庆春,赵斌.2007.位场场源边界识别新技术及其在山西古构造带与断裂探测中的应用研究.工程地质学报,15(4):213~217.
刘湘培,常印佛,吴言昌.1988.论长江中下游地区成矿条件和成矿规律.地质学报,2:167~177.
秦大正,刘昌森,丁项华.1983.长江断裂带东延问题及裂谷特性的讨论.地震地质,3(2):69~73.
孙文珂,黄宗轲,丁鹏飞.2001.重点成矿区带的区域构造和成矿构造文集.北京:地质出版社,1~20.
唐永成,吴言昌,储国正,等.1998.安徽沿江地区铜多金属矿产地质.北京:地质出版社,10~11.
汤加富.2003.大别山及邻区地质构造特征与形成演化:地幔差速环流与陆内多期造山.北京:地质出版社,36~40.
涂广红,江为为,朱东英.2006.中国东北地区剩余重磁异常特征与地质构造及成矿带的关系.地球物理学进展,21(3):746~755.
王京彬.1991.中国东部郯庐断裂南延新解.大地构造与成矿学,170~176.
吴根耀,梁兴,陈焕疆.2007.试论郯城-庐江断裂带的形成、演化及其性质.地质科学,42(1):160~175.
禹尧,徐夕生.2009.长江中下游地区白垩纪富碱火山岩浆作用地球科学,34(1):105~116.
裴荣富,熊群尧.1999.中国特大型金属矿床成矿偏在性与成矿构造聚敛(场).矿床地质,18(1):37~45.
严加永.2010.长江中下游成矿带深部背景综合地球物理研究.中国科学院博士论文.
张季生.2006.位场自动反演技术的研究现状及意义.地球学报,27(6):609~612.
Archibald N,GowP,Boschetti F.1999.Multiscale edge analysis of potential field data.Explore Geophys,30:38~44.
Austin J R,Blenkinsop T G.2008.The Cloncurry Lineament:Geophysical and geological evidence for a deep crustal structurein the Eastern Succession of the Mount Isa Inlier.PrecambrianResearch,163:50~68.
Cordell,Lindrith.1979.Gravi metric expression of graben faultingin Santa Fe County and the Espanola basin,New Mexico:NewMexico Geological Guidebook,30th Field Conference,Santa FeCounty,59~64.
Holden D J,Archibald N J,Boschetti F,Jessell M W,2000.Inferring geological structures using wavelet-based multiscaleedge analysis and forward models.(in Exploration beyond2000;conference handbook)Preview84,97.
Hornby P,Boschetti F,Horowitz F G.1999.Analysis of potentialfield data in the wavelet domain.Geophys,137,175~196.
Horowitz,Hornby,Boschetti.2000.Developments in the analysisof potential field data via multiscale edge representation.(inExploration beyond2000;conference handbook)Preview,84,77.
Miller H G,Singh V.1994.Potential field tilt-A newconcepet forlocation of potential field source.Journal of AppliedGeophysics,32(3):213~217.
Murphy F C.2005.Composition of multi-scale wavelets(WORMS)in the potential field of the Mt Isa region.I2+3final report,pmdCRC,243~259.
Verduzco B,Fairhead J D,Green C M,et.al.2004.Newinsightsinto magnetic derivatives for structural mapping.The leadingedge,23:116~119.
Wijns C,Perez C,Kowalczyk P.2005.Theta map:Edge detectionin magnetic data.Geophysics,70(4):39~43.
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