中国东部及近海磁异常特征及大地构造意义
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摘要
根据全球磁异常数据和中国近海高精度、高分辨率的海洋船磁资料,通过频率域的迭代下延方法,将两种不同分辨率的数据进行融合,得到了覆盖我国东部及近海的大面积地磁异常数据。对磁异常进行大范围变倾角化极,并进行了小波分解和频谱分析,计算、分析磁源重力异常、磁异常解析信号及倾斜角等转换场。结果显示中国东部及近海主要地质构造单元的磁异常特征,揭示了华北地块古陆块分布和扬子地块的南北边界走向,并指出浙闽火山岩带向西南可能和东沙隆起相连,都是中生代古俯冲的火山弧,南海北部NW向断裂可能是古特提斯构造域向太平洋构造域转换边界断裂,对中生代古俯冲及由主动陆缘向被动陆缘转化过程都有控制作用。
On the basis of the latest shipboard magnetic data merging with the world digital magnetic anomaly,we have calculated the reduction to the pole(RTP)anomaly,pseudo-gravity anomaly,analytic signal and tilt angle,and used the wavelet decomposition and frequency spectrum analysis for the RTP anomaly.The results revealed the magnetic signature of the main tectonics in eastern China and adjacent sea.The distributions of paleo-continental nucleus in the North China block were indicated as well as the boundaries of Yangzi block.It was pointed out that the volcanic belt in the coastal area of Zhejiang and Fujian provinces connects to the Dongsha Uplift,and both of them are Mesozoic subduction volcanic arc.The NW-oriented fault may be the boundary fault in which Paleo-Tethys tectonic domain converted to the Pacific tectonic domain,and controlled the subduction process during the Late Mesozoic and the conversion from the active continental margin to the passive continental margin since the Mesozoic at the Northern South China Sea continental margin.
On the basis of the latest shipboard magnetic data merging with the world digital magnetic anomaly,we have calculated the reduction to the pole(RTP)anomaly,pseudo-gravity anomaly,analytic signal and tilt angle,and used the wavelet decomposition and frequency spectrum analysis for the RTP anomaly.The results revealed the magnetic signature of the main tectonics in eastern China and adjacent sea.The distributions of paleo-continental nucleus in the North China block were indicated as well as the boundaries of Yangzi block.It was pointed out that the volcanic belt in the coastal area of Zhejiang and Fujian provinces connects to the Dongsha Uplift,and both of them are Mesozoic subduction volcanic arc.The NW-oriented fault may be the boundary fault in which Paleo-Tethys tectonic domain converted to the Pacific tectonic domain,and controlled the subduction process during the Late Mesozoic and the conversion from the active continental margin to the passive continental margin since the Mesozoic at the Northern South China Sea continental margin.
引文
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[49]WESSEL P,SMITH W H F.New,improved version of generic mapping tools released[J].Eos,Transactions American Geophysical Union,1998,79(47):579.
[2]刘光鼎.中国海地球物理场特征[J].地球物理学进展,2002,17(1):1-12.
[3]郝天珧,刘伊克,段昶.中国东部及其邻域地球物理场特征与大地构造意义[J].地球物理学报,1997,40(5):677-690.
[4]戴勤奋.中国海区及邻域地磁场分析[J].海洋地质与第四纪地质,1997,17(2):63-72.
[5]滕吉文,闫雅芬.中国东南大陆和陆缘地带板内构造界带的地磁异常场响应[J].大地构造与成矿学,2004,28(2):105-117.
[6]李春峰,陈冰,周祖翼.中国东部及邻近海域磁异常数据所揭示的深部构造[J].中国科学:D辑,2009,39(12):1770-1779.
[7]MAUS S,SAZONOVA T,HEMANT K,et al.National geophysical data center candidate for the world digital magnetic anomaly map[J].Geochemistry,Geophysics,Geosystems,2007,8(6):Q6017.
[8]徐世浙,沈晓华,邹乐君,等.将航磁异常从飞行高度向下延拓至地形线[J].地球物理学报,2004,47(6):1127-1130.
[9]李三忠,李玺瑶,赵淑娟,等.全球早古生代造山带(Ⅲ):华南陆内造山[J].吉林大学学报(地球科学版),2016(4):1-23.
[10]LI X.Magnetic reduction-to-the-pole at low latitudes:observations and considerations[J].The Leading Edge,2008(8):990-1002.
[11]管志宁.地磁场与地磁勘探[M].北京:地质出版社,2005.
[12]ROEST W R,VERHOETT J,PILKINGTON M.Magnetic interpretation using the 3Danalytic signal[J].Geophysics,1992,57(1):116-125.
[13]VERDUZCO B,AIRHEAD J D,GREEN C M,et al.New insights into magnetic derivatives for structural mapping[J].The Leading Edge,2004,23(2):116-119.
[14]MILLER H G,SINGH V.Potential field tilt:a new concept for location of potential field sources[J].Journal of Applied Geophysics,1994,32(2/3):213-217.
[15]李三忠,赵国春,孙敏.华北克拉通早元古代拼合与Columbia超大陆形成研究进展[J].科学通报,2016(9):919-925.
[16]李三忠,索艳慧,戴黎明,等.渤海湾盆地形成与华北克拉通破坏[J].地学前缘,2010,17(4):64-89.
[17]车自成,刘良,罗金海.中国及其邻区区域大地构造学[M].北京:科学出版社,2002.
[18]陈建峰,张怡志.苏北-南黄海磁性基底[M]∥刘光鼎.中国海区及邻域地质地球物理特征.北京:科学出版社,1992:131-136.
[19]吴其反,路凤香,刘庆生,等.苏鲁地区地壳深部太古宙残留岩片:来自航磁资料的证据[J].科学通报,2003,48(4):395-399.
[20]李兆鼐.中国东部中、新生代火成岩及其深部过程[M].北京:地质出版社,2003.
[21]徐鸣洁,舒良树.中国东南部晚中生代岩浆作用的深部条件制约[J].高校地质学报,2001,7(1):21-33.
[22]刘英会,余学中,黎津.中国东南沿海不同类型花岗岩的磁性特征[J].物探与化探,2007,31(6):526-528.
[23]江为为,郝天珧,刘少华,等.中国东部大陆与东海海域地质构造的相关性分析[J].地球物理学进展,2004,19(1):75-90.
[24]吴时国,刘展,王万银,等.东沙群岛海区晚新生代构造特征及其对弧-陆碰撞的响应[J].海洋与湖沼,2004,35(6):482-490.
[25]SIBUET J C,HSU S K.Geodynamics of the Taiwan arc-arc collision[J].Tectonophysics,1997,274:221-251.
[26]周蒂,王万银,庞雄,等.地球物理资料所揭示的南海东北部中生代俯冲增生带[J].中国科学:D辑,2006,36(3):209-218.
[27]吴招才,高金耀,李家彪,等.南海北部磁异常特征及对前新生代构造的指示[J].地球物理学报,2011,54(12):3292-3302.
[28]唐贤君,於文辉,单蕊.中国东部-朝鲜半岛中生代板块结合带划分研究现状与问题[J].地质学报,2010,84(5):606-617.
[29]LI Z X.Collision between the North and South China blocks:a crustal-detachment model for suturing in the region east of the Tanlu Fault[J].Geology,1994,22(8):739-742.
[30]徐佩芬,孙若昧,刘福田,等.扬子板块俯冲、断离的地震层析成象证据[J].科学通报,1999,44(15):1658-1661.
[31]徐佩芬,刘福田,王清晨,等.大别-苏鲁碰撞造山带的地震层析成像研究:岩石圈三维速度结构[J].地球物理学报,2000,43(3):377-385.
[32]翟明国,郭敬辉,李忠,等.苏鲁造山带在朝鲜半岛的延伸:造山带、前寒武纪基底以及古生代沉积盆地的证据与制约[J].高校地质学报,2007,13(3):415-428.
[33]金峰男,杜劲松,陈超.中朝与扬子地块结合带东部的卫星重力异常特征研究[J].地球物理学进展,2010,25(4):1219-1232.
[34]程裕淇.中国区域地质概论[M].北京:地质出版社,1994.
[35]郝天珧,刘建华,宋海斌,等.华南及其相邻边缘海域一些重要断裂的地球物理证据[J].地球物理学进展,2002,17(1):13-23.
[36]郝天珧,刘建华,王谦身,等.对下扬子与华南边界结合带东延问题的地球物理探讨[J].地球物理学进展,2003,18(2):269-275.
[37]杨金玉,徐世浙,余海龙,等.视密度反演在东海及邻区重力异常解释中的应用[J].地球物理学报,2008,51(6):1909-1916.
[38]李三忠,余珊,赵淑娟,等.东亚大陆边缘的板块重建与构造转换[J].海洋地质与第四纪地质,2013(3):65-94.
[39]李武显,周新民.中国东南部晚中生代俯冲带探索[J].高校地质学报,1999,5(2):164-168.
[40]陈冰.南海东北部新生代沉积盆地基底的地球物理特征及其地质解释[D].上海:同济大学,2004.
[41]ZHAO M H,QIU X L,XIA S H,et al.Seismic structure in the northeastern South China Sea:S-wave velocity and vp/vs ratios derived from three-component OBS data[J].Tectonophysics,2010,480(1/2/3/4):183-197.
[42]刘昭蜀,赵焕庭,范时清,等.南海地质[M].北京:科学出版社,2002.
[43]吴招才,高金耀,赵俐红,等.南海北部陆缘的磁异常特征及居里面深度[J].地球科学:中国地质大学学报,2010,35(6):1060-1068.
[44]钟广见,吴能友,林珍,等.南海东北陆坡断裂特征及其对盆地演化的控制作用[J].中国地质,2008,35(3):456-462.
[45]HSU S K,YEH Y,DOO W B,et al.New bathymetry and magnetic lineations identifications in the northernmost South China Sea and their tectonic implications[J].Marine Geophysical Researches,2004,25:29-44.
[46]高长林,叶德燎,黄泽光,等.中国中生代两个古大洋与沉积盆地[J].石油实验地质,2006,28(2):95-102.
[47]余心起,吴淦国,张达,等.中国东南部中生代构造体制转换作用研究进展[J].自然科学进展,2005,15(10):1167-1174.
[48]程世秀,李三忠,索艳慧,等.南海北部新生代盆地群构造特征及其成因[J].海洋地质与第四纪地质,2012(6):79-93.
[49]WESSEL P,SMITH W H F.New,improved version of generic mapping tools released[J].Eos,Transactions American Geophysical Union,1998,79(47):579.