苏鲁地区航磁异常特征及其深部地质意义
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摘要
以地震测深剖面提供的地壳结构为初始模型,结合大陆科学钻探岩芯和地表地质资料,对苏鲁地区40000 km2的1∶10万航磁资料进行了处理。根据岩石磁性参量与岩性的相互关系,对该区3条断面进行了约束反演计算,获得了3条断面的岩层结构特征:5 km深度范围内主要为榴辉岩、大理岩和片麻岩,5~7 km为含柯石英榴辉岩的超高压变质岩片,7 km至上地壳底部为经历超高压变质的片麻岩或花岗闪长岩;中地壳(10~19 km)主要为高压变质片麻岩和后期侵入的花岗岩,下地壳(>19 km)主要为酸性、基性麻粒岩。3条剖面上的超高压变质岩片向北倾斜至地表,说明它很可能是华北克拉通的俯冲和原路折返的结果。
The areomagnetic data of the 1∶100 000 from JiangsuShandong orogenic belt are processed based on the primary model of the earth crust structure provided by the deep seismic reflection and other geophysical investigations with magnetism of the core petrology at the CCSD pilot-hole.According to the relationship between the magnetic parameters of the rocks and lithology,restraint inversion is carried out for three sections.Based on the magnetic features of the three sections and deep seismic feflection data,the terrane structure characteristics are given.Pofile I,46 km long,starts from Dazhai of Zhucheng to Boerzhen of Jiaonan;profile II,80 km,from Bahu of Linyi City to Hushan,Rizhao City;and Profile Ⅲ,139 km long,from Tancheng,Shandong to Lianshui,Jiangsu.The inversion results show that the area within a depth of 5 km is dominated by eclotite,marble and gneiss.While inversed magnetic bodies,5 and 7 kilometers deep below the surface,are mainly the UHPM rock slices containing mainly coesite-bearing eclogite.The strata from 7 km to the bottom of upper crust mainly consist of gneiss,granite and granite diorite that have undergone ultra high pressure metamorphic process.Middle crust(10—19 km) is mostly composed of UHPM gneiss and granite of later intrusion.The lower crust contains acid and basic granulite.The northward dipping to the surface of the three profiles reveals that they may have been resulted from the subduction of North China craton and returned along the original path in Triassic period.
The areomagnetic data of the 1∶100 000 from JiangsuShandong orogenic belt are processed based on the primary model of the earth crust structure provided by the deep seismic reflection and other geophysical investigations with magnetism of the core petrology at the CCSD pilot-hole.According to the relationship between the magnetic parameters of the rocks and lithology,restraint inversion is carried out for three sections.Based on the magnetic features of the three sections and deep seismic feflection data,the terrane structure characteristics are given.Pofile I,46 km long,starts from Dazhai of Zhucheng to Boerzhen of Jiaonan;profile II,80 km,from Bahu of Linyi City to Hushan,Rizhao City;and Profile Ⅲ,139 km long,from Tancheng,Shandong to Lianshui,Jiangsu.The inversion results show that the area within a depth of 5 km is dominated by eclotite,marble and gneiss.While inversed magnetic bodies,5 and 7 kilometers deep below the surface,are mainly the UHPM rock slices containing mainly coesite-bearing eclogite.The strata from 7 km to the bottom of upper crust mainly consist of gneiss,granite and granite diorite that have undergone ultra high pressure metamorphic process.Middle crust(10—19 km) is mostly composed of UHPM gneiss and granite of later intrusion.The lower crust contains acid and basic granulite.The northward dipping to the surface of the three profiles reveals that they may have been resulted from the subduction of North China craton and returned along the original path in Triassic period.
引文
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[2]Liu Qingsheng,Gao Shan,Liu Yongsheng.Magnetic structureof the continental crustal cross-section in central North ChinaCraton[J].Journal of Geodynamics,2000,29(1/2):1-13.
[3]Liu Qingsheng,Gao Shan.Magnetic petrology of high-gradeterrains in the Archean shield areas:Window into deep crustalstructure and geodynamic processes[J].Journal of China Uni-versity of Geosciences,1998,9(1):81-85.
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[5]金振民,余日东,杨文采,等.江苏东海县幔源橄榄岩包体及其深部构造意义[J].地质学报,2003,77(4):452-459.
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[10]张国伟,张本仁,袁学诚,等.秦岭造山带与大陆动力学[M].北京:科学出版社,2004.
[11]董树文,孙先知,张勇,等.大别山碰撞造山带基本结构[M].科学通报,1993,38(6):542-545.
[12]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):349-360.
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[14]Okay A I,Sengoer A M C,Satn M.Tectonics of an ultrahigh-pressure metamorphic terran:The Dabie shan/Tongbai Shanorogen,China[J].Tectonics,1993,12(6):1 320-1 334.
[15]王清晨,孙枢,李继亮,等.秦岭的大地构造演化[J].地质科学,1989,2:129-142.
[16]刘景波,游振东.秦岭群中条带状混合岩质量等比线分析[J].岩石学报,1997,13(3):427-438.
[17]索书田,钟增球,游振东.大别苏鲁超高压—高压变质带伸展构造格架及其动力学意义[J].地质学报,2001,75(1):14-24.
[18]Xu S T,Okay A,Ji S,et al.Diamond from the Dabie Shan met-amorphic rocks and its implication for tectonic setting[J].Sci-ences,1992,256:80-82.
[19]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辑,1997,27(3):221-226.
[20]袁学诚,任纪舜,徐明才,等.东秦岭邓县—南漳反射地震剖面及其构造意义[J].中国地质,2002,29(1):14-19.
[21]杨文采,余长青.根据地球物理资料分析大别—苏鲁超高压变质带演化的运动学与动力学[J].地球物理学报,2001,44(3):61-75.
[22]杨文采,程振炎,张春贺.中国科学深钻选址地球物理调查与大别—苏鲁岩石圈[J].地球学报,2003,24(5):391-404.
[23]杨文采,杨午阳,程振炎.中国大陆科学钻探主孔区三维地震资料的初步解释[J].岩石学报,2004,20(1):128-134.
[24]王有学,姜枚,韩国华.中国大陆科学钻探场址区的地壳速度结构特征[J].地球科学:中国地质大学学报,2004,29(6):667-672.
[25]徐纪人,赵志新.苏鲁造山带区域地壳山根结构特征[J].岩石学报,2004,20(1):149-156.
[26]杨文采,程振炎,陈国九,等.苏鲁超高压变质带北部地球物理调查(Ι)——深反射地震[J].地球物理学报,1999,42(1):41-52.
[27]杨文采,胡振远,程振炎,等.郯城—涟水综合地球物理剖面[J].地球物理学报,1999,42(2):206-217.
[28]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.
[29]吴其反,路凤香,刘庆生,等.苏鲁地区地壳深部太古代残留岩片:来自航磁资料的证据[J].科学通报,2003,48(4):395-399.
[30]余钦范,姚长利,孟小红,等.苏北大陆科学钻探靶区重磁异常反演解释[J].地球物理学报,2001,44(6):825-832.
[31]余钦范,郭友钊,孟小红,等.苏北大陆科学钻探靶区岩石物理性质[J].地球物理学报,2002,45(1):93-100.
[32]多而特曼H B.岩石和矿物的物理性质[M].蒋宏耀译.北京:科学出版社,1985.
[33]Liu Qingsheng,Gao Shan.Magnetic structure of the continen-tal crust:Implications for crustal structure and evolution[J].Journal of China University of Geosciences,2000,11(3):356-360.
[34]胥颐.北天山地震带的航磁异常与深部构造[J].内陆地震,1996,10(4):304-310.
[35]Fausto F,Franco C,Emanuele B,et al.Rifted(?)crust at theEast Antarctic Craton margin:Gravity and magnetic interpre-tation along a traverse across the Wilkes Subglacial Basin re-gion[J].Earth Planetary Science Letters,2001,192:407-421.
[36]Mark P,John A P.Relating crustal magnetization and satellite-altitude magnetic anomalies in the Ungava Peninsula,northenQuebec,Canada[J].Earth Planetary Science Letters,2001,194:127-133.
[37]Brown D,Carbonell R,Kukkonen I,et al.Compositon of theUralide crust from seismic velocity(vp,vs),heat flow,gravity,and magnetic data[J].Earth Planetary Science Letters,2003,210:333-349.
[38]戴明刚.东海及邻域的两条剖面地球物理反演与综合解释[J].地球物理学进展,2004,19(2):331-340.
[39]Qiao Qingqing,Liu Qingsheng.Curie point depth investigationof the Dabie-Sulu UPH metamorphic belt[J].Tectonophysics,2007.
[40]张家声,劳秋元.航磁异常的构造解释和华北—塔南—扬子超陆块演化[J].地学前缘,1999,6(4):379-390.
[41]徐海军.中国大陆科学钻探工程主孔(100~2 000 m)岩芯及周边地区岩石的磁化率研究[D].武汉:中国地质大学,2005.
[42]路凤香,王春阳,胡宝群,等.南秦岭下地壳组成及岩石圈的拆离俯冲作用[J].中国地质,2005,30(2):113-119.
[43]李曙光.大别山超高压变质岩折返机制与华北华南陆块碰撞过程[J].地学前缘,2004,11(3):63-70.
[2]Liu Qingsheng,Gao Shan,Liu Yongsheng.Magnetic structureof the continental crustal cross-section in central North ChinaCraton[J].Journal of Geodynamics,2000,29(1/2):1-13.
[3]Liu Qingsheng,Gao Shan.Magnetic petrology of high-gradeterrains in the Archean shield areas:Window into deep crustalstructure and geodynamic processes[J].Journal of China Uni-versity of Geosciences,1998,9(1):81-85.
[4]Liu Qingsheng,Gao Shan,Xu Qingdong,et al.Magnetic struc-ture of Archean Kongling Group from Yangtze Craton,SouthChina[J].Journal of China University of Geosciences,1998,9(2):144-151.
[5]金振民,余日东,杨文采,等.江苏东海县幔源橄榄岩包体及其深部构造意义[J].地质学报,2003,77(4):452-459.
[6]Fountain D M,Salisbury M H.Exposed cross sections throughthe continental crust:Implications for crustal structure,petrol-ogy and evolution[J].Earth Planetary Science Letters,1981,5:263-277.
[7]Shive P N,Blakely R J,Frost B R,et al.Magnetic properties ofthe lower continental crust[M]∥Fountain D M.Continentallower crust.New York:Elsevier,1992:145-177.
[8]刘庆生,高山,刘勇胜.华北克拉通中部大陆地壳断面磁性结构研究及意义[J].地球物理学报.2000,43(1):64-72.
[9]McEnroe S A,Langenhorst F,Robinson P,et al.What is mag-netic in the lower crust?[J].Earth Planetary Science Letters,2004,226:175-192.
[10]张国伟,张本仁,袁学诚,等.秦岭造山带与大陆动力学[M].北京:科学出版社,2004.
[11]董树文,孙先知,张勇,等.大别山碰撞造山带基本结构[M].科学通报,1993,38(6):542-545.
[12]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):349-360.
[13]刘建华,刘福田,孙若昧,等.秦岭—大别造山带及其南北缘地震层析成像[J].地球物理学报,1995,38(1):46-54.
[14]Okay A I,Sengoer A M C,Satn M.Tectonics of an ultrahigh-pressure metamorphic terran:The Dabie shan/Tongbai Shanorogen,China[J].Tectonics,1993,12(6):1 320-1 334.
[15]王清晨,孙枢,李继亮,等.秦岭的大地构造演化[J].地质科学,1989,2:129-142.
[16]刘景波,游振东.秦岭群中条带状混合岩质量等比线分析[J].岩石学报,1997,13(3):427-438.
[17]索书田,钟增球,游振东.大别苏鲁超高压—高压变质带伸展构造格架及其动力学意义[J].地质学报,2001,75(1):14-24.
[18]Xu S T,Okay A,Ji S,et al.Diamond from the Dabie Shan met-amorphic rocks and its implication for tectonic setting[J].Sci-ences,1992,256:80-82.
[19]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辑,1997,27(3):221-226.
[20]袁学诚,任纪舜,徐明才,等.东秦岭邓县—南漳反射地震剖面及其构造意义[J].中国地质,2002,29(1):14-19.
[21]杨文采,余长青.根据地球物理资料分析大别—苏鲁超高压变质带演化的运动学与动力学[J].地球物理学报,2001,44(3):61-75.
[22]杨文采,程振炎,张春贺.中国科学深钻选址地球物理调查与大别—苏鲁岩石圈[J].地球学报,2003,24(5):391-404.
[23]杨文采,杨午阳,程振炎.中国大陆科学钻探主孔区三维地震资料的初步解释[J].岩石学报,2004,20(1):128-134.
[24]王有学,姜枚,韩国华.中国大陆科学钻探场址区的地壳速度结构特征[J].地球科学:中国地质大学学报,2004,29(6):667-672.
[25]徐纪人,赵志新.苏鲁造山带区域地壳山根结构特征[J].岩石学报,2004,20(1):149-156.
[26]杨文采,程振炎,陈国九,等.苏鲁超高压变质带北部地球物理调查(Ι)——深反射地震[J].地球物理学报,1999,42(1):41-52.
[27]杨文采,胡振远,程振炎,等.郯城—涟水综合地球物理剖面[J].地球物理学报,1999,42(2):206-217.
[28]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.
[29]吴其反,路凤香,刘庆生,等.苏鲁地区地壳深部太古代残留岩片:来自航磁资料的证据[J].科学通报,2003,48(4):395-399.
[30]余钦范,姚长利,孟小红,等.苏北大陆科学钻探靶区重磁异常反演解释[J].地球物理学报,2001,44(6):825-832.
[31]余钦范,郭友钊,孟小红,等.苏北大陆科学钻探靶区岩石物理性质[J].地球物理学报,2002,45(1):93-100.
[32]多而特曼H B.岩石和矿物的物理性质[M].蒋宏耀译.北京:科学出版社,1985.
[33]Liu Qingsheng,Gao Shan.Magnetic structure of the continen-tal crust:Implications for crustal structure and evolution[J].Journal of China University of Geosciences,2000,11(3):356-360.
[34]胥颐.北天山地震带的航磁异常与深部构造[J].内陆地震,1996,10(4):304-310.
[35]Fausto F,Franco C,Emanuele B,et al.Rifted(?)crust at theEast Antarctic Craton margin:Gravity and magnetic interpre-tation along a traverse across the Wilkes Subglacial Basin re-gion[J].Earth Planetary Science Letters,2001,192:407-421.
[36]Mark P,John A P.Relating crustal magnetization and satellite-altitude magnetic anomalies in the Ungava Peninsula,northenQuebec,Canada[J].Earth Planetary Science Letters,2001,194:127-133.
[37]Brown D,Carbonell R,Kukkonen I,et al.Compositon of theUralide crust from seismic velocity(vp,vs),heat flow,gravity,and magnetic data[J].Earth Planetary Science Letters,2003,210:333-349.
[38]戴明刚.东海及邻域的两条剖面地球物理反演与综合解释[J].地球物理学进展,2004,19(2):331-340.
[39]Qiao Qingqing,Liu Qingsheng.Curie point depth investigationof the Dabie-Sulu UPH metamorphic belt[J].Tectonophysics,2007.
[40]张家声,劳秋元.航磁异常的构造解释和华北—塔南—扬子超陆块演化[J].地学前缘,1999,6(4):379-390.
[41]徐海军.中国大陆科学钻探工程主孔(100~2 000 m)岩芯及周边地区岩石的磁化率研究[D].武汉:中国地质大学,2005.
[42]路凤香,王春阳,胡宝群,等.南秦岭下地壳组成及岩石圈的拆离俯冲作用[J].中国地质,2005,30(2):113-119.
[43]李曙光.大别山超高压变质岩折返机制与华北华南陆块碰撞过程[J].地学前缘,2004,11(3):63-70.
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