庐枞火山岩盆地及其外围重、磁场特征
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摘要
为探测长江中下游成矿带庐江-枞阳白垩纪火山岩盆地的深部构造和地壳结构,2007年初在庐枞火山岩盆地进行了以深反射地震剖面探测为主的,新一轮重力、磁力和大地电磁剖面测量。作者在前人研究的基础上对庐枞火山岩盆地及其外围重、磁场特征进行了研究。作者首先分析长江中下游地区重、磁场的分布特征,然后以区域重、磁场特征为背景来认识庐枞地区重、磁场的分布特征。研究各类地质体的物性参数是开展地球物理解释的前提,文中收集并分析了前人对庐枞地区的岩石物性的较为系统研究成果。为了提取重、磁异常的特征,文中对重、磁异常进行了位场转换和图像处理。利用新的深反射地震剖面探测和大地电磁剖面研究成果,采用定性和定量解释方法对庐枞地区重、磁场的分布特征进行了研究并提出新的认识。庐枞火山岩盆地深部存在隐伏的磁性强的中碱性岩类是产生区域磁异常的主要原因。庐枞火山岩盆地下部火成岩所侵入的地层向盆地东南方向延伸,盆地的西北边界向东南方向倾斜。而在罗河断裂带以西没有火成岩存在。亦即庐枞火山岩盆地是一个沿北东向罗河断裂向东发育的非对称火山盆地。另外,在庐枞火山岩盆地西部边缘罗河深部存在切穿莫霍面的断裂带沿北东向延展数十千米。
In order to explore the crustal structure of Lujiang-Zongyang volcanic basin in Middle-Lower Yangtze rift metallogenic belt during Cretaceous,deep reflection seismic,magnetotelluric,magnetic and gravity profiles through volcanic basin were finished in 2007.On the basis of the new data,we study the feature of gravity and magnetic anomalies of Luzong volcanic basin and its periphery.We analyzed the gravity and magnetic anomalies of in Middle-Lower Yangtze rift area firstly.We analyze the rock physical characteristics,and process the gravity and magnetic data in Luzong area by using transformation of potential field and image processing technique.Gravity and magnetic modeling is restricted in the deep reflection seismic data.We suggest that the phenomena of high regional magnetic anomaly are mainly caused by the intermediate-alkaline rocks buried in the Luzong volcano basin.The research results of the gravity and magnetic models and the feature of gravity and magnetic anomalies support the idea that the "ear-shape" Luzong basin was a dissymmetrical basin along Luohe fault with north-east strike direction and eliminated the judgment that another half basin was buried,below red layer,west side of Luohe fault.In addition,the Luohe fault,which cuts across the MOHO,trend several ten kilometers in the direction of NE.
In order to explore the crustal structure of Lujiang-Zongyang volcanic basin in Middle-Lower Yangtze rift metallogenic belt during Cretaceous,deep reflection seismic,magnetotelluric,magnetic and gravity profiles through volcanic basin were finished in 2007.On the basis of the new data,we study the feature of gravity and magnetic anomalies of Luzong volcanic basin and its periphery.We analyzed the gravity and magnetic anomalies of in Middle-Lower Yangtze rift area firstly.We analyze the rock physical characteristics,and process the gravity and magnetic data in Luzong area by using transformation of potential field and image processing technique.Gravity and magnetic modeling is restricted in the deep reflection seismic data.We suggest that the phenomena of high regional magnetic anomaly are mainly caused by the intermediate-alkaline rocks buried in the Luzong volcano basin.The research results of the gravity and magnetic models and the feature of gravity and magnetic anomalies support the idea that the "ear-shape" Luzong basin was a dissymmetrical basin along Luohe fault with north-east strike direction and eliminated the judgment that another half basin was buried,below red layer,west side of Luohe fault.In addition,the Luohe fault,which cuts across the MOHO,trend several ten kilometers in the direction of NE.
引文
[1]战双庆,陈社教,冯向东等.2008.庐枞罗河矿集区高精度重磁测量成果报告
[1]地质矿产部区域重力调查方法技术中心,地质矿产部区地球物理地球化学勘查研究所.1999.中国及毗邻海域布格重力异常图,1:5000000,内部出版
[1]高锐,卢占武.2008.庐枞火山岩铁多金属矿集区二维反射地震试验研究课题研究报告
[2]战双庆,汪启年,李涛.2008.庐枞火山岩盆地大地电磁测深(MT)剖面成果报告
Chang YF,Liu XP and Wu YC.1991.The Iron-Copper MineralizationBelt of Middle-Lower Yangtze Valley.Beijing:Geological PublishingHouse,134-147(in Chinese)
Chen HS.1988.Comprehensive geophysical survey of HQ-13line in theLower Yangtze Reaches and its geological significance.Oil and GasGeology,9(3):211-222(in Chinese with English abstract)
Dong SW.1991.Tectonic analysis on genesis of metallogenetic belt ofMiddle-Lower Yangtze River.Bulletin of the Chinese Academy ofGeological Sciences,23:43-56(in Chinese with English abstract)
Dong SW,Wu XZ,Gao Ret al.1998.On the crust velocity levels anddynamics of the Dabieshan orogenic belt.Acta Geophysica Sinica,41(3):349-361(in Chinese with English abstract)
Dong SW,Gao R,Lv QTet al.2009.Deep structure and ore-forming inLujiang-Zongyang ore concentrated area.Acta Geoscientica Sinica,30(3):279-284(in Chinese with English abstract)
Gao R,Lu ZW,Liu JK,Kuang CY,Feng SY,Li PY,Zhang JS andWang HY.2010.A result of interpreting from deep seismicreflection profile:Revealing fine of the crust and tracing deepprocess of the minetalization in Luzong deposit area.Acta PetrologicaSinica,26(9):2543-2552(in Chinese with English abstract)
LüQT,Hou ZQ,Zhao JHet al.2003.Complicated structure of crust inTongling ore district revealed by using deep reflection seismicprofile.Sciences in China(Series D),33(5):442-449(in Chinese)
Ren QJ,Wang DZ,Xu YWet al.1993.Formation and development ofthe Mesozoic Lujiang-Zongyang volcanic-structural depression inAuhui Province and their relation to mineralization.Acta GeologicaSinica,67(2):131-145(in Chinese with English abstract)
Talwani M and Heirtzler JR.1964.Computation of magnetic anomaliescaused by two-dimensional bodies of arbitrary shape.In:Parks GAG(ed.).Computers in the Mineral Iindustries,Part1.StandfordUniv.Publ.,Geological Sciences,9:464-480
Teng JW,Song KZ,Xiong SBet al.1985.Explosion seismological studyfor velocity distribution and structure of the crust and upper mantlefrom Maanshan to Aidong of the sourthern parts of China.ActaGeophys Sin,28(2):155-169(in Chinese)
Wang CY,Zeng RS,Mooney WDet al.2000.A crustal model of theultrahigh-pressure Dabie Shan orogenic belt,China,derived fromdeep seismic refraction profiling.J.Geophys.Res.,105(B5):10857-10869
Wang DZ,Ren QJ,Qiu JS,Chen KR,Xu ZW and Zen JH.1996.Characteristics of volcanic rocks in the shoshonite province,easternChina,and their metallogenesis.Acta Geoscientica Sinica,70(1):23-34(in Chinese with English abstract)
Xiong SB and Liu HB.2000.Crust-mantle structure of Zhejiang-Anhuiregion and the boundary between Yangzi block and Huanan block.Geophysical Progress,15(4):3-17(in Chinese with Englishabstract)
Yu XY and Bai ZH.1981.Latitic series in Lujiang-Zongyang region.Geochimica,1:57-64(in Chinese with English abstract)
Yuan F,Zhou TF,Fan Yet al.2006.Characteristics of Nd-Sr isotopes ofthe Yanshanian magmatic rocks in the Jiangnan rise bordering Anhuiand Jiangxi provinces.Chinese Journal of Geology,41(1):133-142(in Chinese with English abstract)
Zhang ZJ,Li YK,Lu DYet al.2000.Velocity and anisotropy structureof the crust in the Dabie shan orogenic belt from wide-angle seismicdata.Phys.Earth Planet.Int.,122:115-131
Zheng Y and Teng JW.1989.The structure of the crust and upper mantlein the Shuixian-Maanshan zone and some characteristics of the southpart of the Tan-Lu tectonic belt.Acta Geophysica Sinica,32(6):648-659(in Chinese with English abstract)
Zhu G,Liu GS,Li SYet al.2000.“Four-story”structure of the basinsin the Lower Yangtze region and their geodynamic setting.Journal ofHefei University of Technology,23(1):648-659(in Chinese withEnglish abstract)
常印佛,刘湘培,吴吉昌.1991.长江中下游铜铁成矿带.北京:地质出版社
陈沪生.1988.下扬子地区HQ-13线的综合地球物理调查及其地质意义.石油与天然气地质,9(3),211-222
董树文.1991.长江中下游铁铜矿带成因之构造分析.中国地质科学院院报,23:43-56
董树文,吴宣志,高瑞等.1998.大别造山带地壳速度结构与动力学.地球物理学报,41(3):349-361
董树文,高锐,吕庆田等.2009.庐江-枞阳矿集区深部结构与成矿.地球学报,30(3):47-52
高锐,卢占武,刘金凯,匡朝阳,酆少英,李朋武,张季生,王海燕.2010.庐-枞金属矿集区神地震反射剖面解释结果——揭露地壳精细结构,追踪成矿深部过程.岩石学报,26(9):2543-2552
吕庆田,侯增谦,赵金花等.2003.深地震反射剖面揭示铜陵矿集区复杂地壳结构形态.中国科学(D辑),33(5):442-449
任启江,王德滋,徐兆文等.1993.安徽庐枞火山-构造洼地的形成、演化及成矿.地质学报,67(2):131-145
滕吉文,姚虹,孙克忠等.1985.中国东部马鞍山-常熟-启东地带地壳与上地幔结构和速度分布的爆炸地震研究.地球物理学报,28(2):156-168
王德滋,任启江,邱检生等.1996.中国东部橄榄安粗岩省的火山岩特征及其成矿作用.地质学报,70(1):23-34
熊绍柏,刘宏兵.2000.浙皖地区地壳-上地幔结构和华南与扬子块体边界.地球物理学进展,15(4):3-17
于学元,白正华.1981.庐枞地区安粗岩系.地球化学,1:57-64
袁峰,周涛发,范裕等.2006.江南隆起带皖赣相邻区燕山期岩浆岩Nd-Sr同位素特征.地质科学,41(1):133-142
郑晔,滕吉文.1989.随县-马鞍山地带地壳与上地幔结构及郯庐构造带南段的某些特征.地球物理学报,32(6):648-659
朱光,刘国生,李双应等.2000.下扬子地区盆地的“四层楼”结构及其动力学机制.合肥工业大学学报(自然科学版),23(1):648-659
[1]地质矿产部区域重力调查方法技术中心,地质矿产部区地球物理地球化学勘查研究所.1999.中国及毗邻海域布格重力异常图,1:5000000,内部出版
[1]高锐,卢占武.2008.庐枞火山岩铁多金属矿集区二维反射地震试验研究课题研究报告
[2]战双庆,汪启年,李涛.2008.庐枞火山岩盆地大地电磁测深(MT)剖面成果报告
Chang YF,Liu XP and Wu YC.1991.The Iron-Copper MineralizationBelt of Middle-Lower Yangtze Valley.Beijing:Geological PublishingHouse,134-147(in Chinese)
Chen HS.1988.Comprehensive geophysical survey of HQ-13line in theLower Yangtze Reaches and its geological significance.Oil and GasGeology,9(3):211-222(in Chinese with English abstract)
Dong SW.1991.Tectonic analysis on genesis of metallogenetic belt ofMiddle-Lower Yangtze River.Bulletin of the Chinese Academy ofGeological Sciences,23:43-56(in Chinese with English abstract)
Dong SW,Wu XZ,Gao Ret al.1998.On the crust velocity levels anddynamics of the Dabieshan orogenic belt.Acta Geophysica Sinica,41(3):349-361(in Chinese with English abstract)
Dong SW,Gao R,Lv QTet al.2009.Deep structure and ore-forming inLujiang-Zongyang ore concentrated area.Acta Geoscientica Sinica,30(3):279-284(in Chinese with English abstract)
Gao R,Lu ZW,Liu JK,Kuang CY,Feng SY,Li PY,Zhang JS andWang HY.2010.A result of interpreting from deep seismicreflection profile:Revealing fine of the crust and tracing deepprocess of the minetalization in Luzong deposit area.Acta PetrologicaSinica,26(9):2543-2552(in Chinese with English abstract)
LüQT,Hou ZQ,Zhao JHet al.2003.Complicated structure of crust inTongling ore district revealed by using deep reflection seismicprofile.Sciences in China(Series D),33(5):442-449(in Chinese)
Ren QJ,Wang DZ,Xu YWet al.1993.Formation and development ofthe Mesozoic Lujiang-Zongyang volcanic-structural depression inAuhui Province and their relation to mineralization.Acta GeologicaSinica,67(2):131-145(in Chinese with English abstract)
Talwani M and Heirtzler JR.1964.Computation of magnetic anomaliescaused by two-dimensional bodies of arbitrary shape.In:Parks GAG(ed.).Computers in the Mineral Iindustries,Part1.StandfordUniv.Publ.,Geological Sciences,9:464-480
Teng JW,Song KZ,Xiong SBet al.1985.Explosion seismological studyfor velocity distribution and structure of the crust and upper mantlefrom Maanshan to Aidong of the sourthern parts of China.ActaGeophys Sin,28(2):155-169(in Chinese)
Wang CY,Zeng RS,Mooney WDet al.2000.A crustal model of theultrahigh-pressure Dabie Shan orogenic belt,China,derived fromdeep seismic refraction profiling.J.Geophys.Res.,105(B5):10857-10869
Wang DZ,Ren QJ,Qiu JS,Chen KR,Xu ZW and Zen JH.1996.Characteristics of volcanic rocks in the shoshonite province,easternChina,and their metallogenesis.Acta Geoscientica Sinica,70(1):23-34(in Chinese with English abstract)
Xiong SB and Liu HB.2000.Crust-mantle structure of Zhejiang-Anhuiregion and the boundary between Yangzi block and Huanan block.Geophysical Progress,15(4):3-17(in Chinese with Englishabstract)
Yu XY and Bai ZH.1981.Latitic series in Lujiang-Zongyang region.Geochimica,1:57-64(in Chinese with English abstract)
Yuan F,Zhou TF,Fan Yet al.2006.Characteristics of Nd-Sr isotopes ofthe Yanshanian magmatic rocks in the Jiangnan rise bordering Anhuiand Jiangxi provinces.Chinese Journal of Geology,41(1):133-142(in Chinese with English abstract)
Zhang ZJ,Li YK,Lu DYet al.2000.Velocity and anisotropy structureof the crust in the Dabie shan orogenic belt from wide-angle seismicdata.Phys.Earth Planet.Int.,122:115-131
Zheng Y and Teng JW.1989.The structure of the crust and upper mantlein the Shuixian-Maanshan zone and some characteristics of the southpart of the Tan-Lu tectonic belt.Acta Geophysica Sinica,32(6):648-659(in Chinese with English abstract)
Zhu G,Liu GS,Li SYet al.2000.“Four-story”structure of the basinsin the Lower Yangtze region and their geodynamic setting.Journal ofHefei University of Technology,23(1):648-659(in Chinese withEnglish abstract)
常印佛,刘湘培,吴吉昌.1991.长江中下游铜铁成矿带.北京:地质出版社
陈沪生.1988.下扬子地区HQ-13线的综合地球物理调查及其地质意义.石油与天然气地质,9(3),211-222
董树文.1991.长江中下游铁铜矿带成因之构造分析.中国地质科学院院报,23:43-56
董树文,吴宣志,高瑞等.1998.大别造山带地壳速度结构与动力学.地球物理学报,41(3):349-361
董树文,高锐,吕庆田等.2009.庐江-枞阳矿集区深部结构与成矿.地球学报,30(3):47-52
高锐,卢占武,刘金凯,匡朝阳,酆少英,李朋武,张季生,王海燕.2010.庐-枞金属矿集区神地震反射剖面解释结果——揭露地壳精细结构,追踪成矿深部过程.岩石学报,26(9):2543-2552
吕庆田,侯增谦,赵金花等.2003.深地震反射剖面揭示铜陵矿集区复杂地壳结构形态.中国科学(D辑),33(5):442-449
任启江,王德滋,徐兆文等.1993.安徽庐枞火山-构造洼地的形成、演化及成矿.地质学报,67(2):131-145
滕吉文,姚虹,孙克忠等.1985.中国东部马鞍山-常熟-启东地带地壳与上地幔结构和速度分布的爆炸地震研究.地球物理学报,28(2):156-168
王德滋,任启江,邱检生等.1996.中国东部橄榄安粗岩省的火山岩特征及其成矿作用.地质学报,70(1):23-34
熊绍柏,刘宏兵.2000.浙皖地区地壳-上地幔结构和华南与扬子块体边界.地球物理学进展,15(4):3-17
于学元,白正华.1981.庐枞地区安粗岩系.地球化学,1:57-64
袁峰,周涛发,范裕等.2006.江南隆起带皖赣相邻区燕山期岩浆岩Nd-Sr同位素特征.地质科学,41(1):133-142
郑晔,滕吉文.1989.随县-马鞍山地带地壳与上地幔结构及郯庐构造带南段的某些特征.地球物理学报,32(6):648-659
朱光,刘国生,李双应等.2000.下扬子地区盆地的“四层楼”结构及其动力学机制.合肥工业大学学报(自然科学版),23(1):648-659
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