黄海中央断裂带的地球物理证据及其与边缘海演化的关系
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摘要
根据黄海及周边地区的布格重力资料 ,通过解析延拓、目标场提取、任意水平方向导数计算、离散小波变换等处理 ,得到各种有关断裂的信息 .经过与地震层析成像结果和地质资料的综合分析 ,认为黄海中央断裂带是一组“X”型交叉断裂而不仅仅是一条NW向延伸的断裂 ,并提出了有关的地球物理证据 .经分析认为 :黄海中央断裂带的存在是造成黄海东西两侧在地球物理场面貌、断裂分布特点与规模上有较大差异的原因之一 .由于该断裂带的存在 ,致使郯庐断裂带的右旋活动所产生的应力对黄海东西两侧的影响不一致 ,因而产生了黄海西部重力异常等值线凌乱、密集、断裂密布但规模相对东部较小的现象 .认为黄海中央断裂带受扬子块体向中朝块体嵌入过程的影响 ,形成一组近SN向为锐角的“X”断裂带 ,但该断裂带具有明显多期活动的迹象 ,不仅与特提斯体制下块体碰撞、俯冲作用有关 ,也与后期太平洋板块向欧亚板块的聚敛、俯冲作用有关 .
In light with Bouguer gravity data, various information on faults were obtained after the processing (upward, arbitrary horizontal direction derivative, wavelet transform etc.). It is shown that the Center Faults in Yellow Sea are 2 faults instead of one fault in NW direction. The geophysical evidences are shown after comprehensive analysis on gravity, tomography result and geological information. We believe that existence of the Center Faults in Yellow Sea is of reasons for the differences on geophysical field , distribution and size of faults. Stress from dextrorotation activity of Tanlu Fault brings different effect to the west and east parts of Yellow Sea because of the existing of the Center Faults in Yellow Sea. Isolines of gravity in the west part of Yellow Sea are dense but the size of gravity anomaly is less than in the east part of Yellow Sea. The sharp angle in SN direction of “X”—sharp faults in one group were formed during the inset process from Yangtze block to Sino-korean Bolck. The center fautls in Yellow Sea show the active evidences in different time. They are related not only with block collision in Tethyan System but also with subduction afterward from Pacific Plate to Euro-Asia Plate.
In light with Bouguer gravity data, various information on faults were obtained after the processing (upward, arbitrary horizontal direction derivative, wavelet transform etc.). It is shown that the Center Faults in Yellow Sea are 2 faults instead of one fault in NW direction. The geophysical evidences are shown after comprehensive analysis on gravity, tomography result and geological information. We believe that existence of the Center Faults in Yellow Sea is of reasons for the differences on geophysical field , distribution and size of faults. Stress from dextrorotation activity of Tanlu Fault brings different effect to the west and east parts of Yellow Sea because of the existing of the Center Faults in Yellow Sea. Isolines of gravity in the west part of Yellow Sea are dense but the size of gravity anomaly is less than in the east part of Yellow Sea. The sharp angle in SN direction of “X”—sharp faults in one group were formed during the inset process from Yangtze block to Sino-korean Bolck. The center fautls in Yellow Sea show the active evidences in different time. They are related not only with block collision in Tethyan System but also with subduction afterward from Pacific Plate to Euro-Asia Plate.
引文
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[16] 万天丰,朱 鸿,赵 磊等.郯庐断裂带的形成与演化:综述.现代地质,1996,10(2):159～168WANTianfeng,ZHUHong,ZHAOLei,etal.FormationandevolutionofTancheng lujiangfaultzone:areview.Geoscience,1996,10(2):159～168
[17] 王小凤,李中坚,陈柏林等.郯庐断裂带.北京:地质出版社,2000WANGXiaofeng,LIZhongjian,CHENBailin,etal.TanchengLujiangfault.Beijing:GeologicalPublishingHouse,2000
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[19] 吴根耀,陈焕疆,马 力等.苏皖地块———特提斯演化阶段独立的构造单元.考古地理学报,2002,4(2):77～87WUGenyao,CHENHuanjiang,MALi,etal.SuWanBlock:Anindependenttectonicunitduringperiodoftethyanevolution.JournalofPalaeogeography,2002,4(2):77～87
[2] 刘光鼎主编.中国海区及邻域地球物理场特征,北京:科学出版社,1992LIUGuangdinged.GeophysicalFieldFeaturesofChinaSeaandAdjacentRegions.Beijing:SciencePress,1992
[3] 金翔龙.北黄海的构造轮廓.见:黄东海地质.北京:科学出版社,1982.23～29JINXianglong.TectonicOutlineofNorthernYellowSea.In:GeologyofEastChinaSeaandYellowSea.Beijing:SciencePress,1982.23～29
[4] CONGBolin,ZHAIMingguo,DENNISA .Carswell,etal.Petrogenesisofultrahigh pressurerocksandtheircountryrockatShuangheinDabieshan,CentralChina.Eur.J.Mineral,1995,7:119～138
[5] LEEDongwoo.StrikeslipfaulttectonicsandbasinformationduringtheCretaceousintheKoreanPeninsula.TheIslandArc,1999,8:218～231
[6] 杨志坚.胶东地块构造演化及其东延去向问题.海洋地质与第四纪地质,1989,9(2):1～11YANGZhijian.OnthetectonicevolutionofJiaodongmassanditsextensiontoEast.MarineGeology&QuaternaryGeology,1989,9(2):1～11
[7] YinA ,NieS .AnindentationmodeforthenorthandsouthChinacollisionandthedevelomentoftheTan luandHonamfaultsystems,easternAsia.Tectonics,1993,12:801～813
[8] 郝天珧,SuhMancheol,王谦身等.根据重力数据研究黄海周边断裂带在海区的延伸.地球物理学报,2002,45(3):385～397HAOTianyao,SUHMancheol,WANGQianshen,etal.ThestudyofextensionoffaultsinYellowSeaandadjacentregionfromgravitydata.ChineseJ .Geophys.,2002,45(3):385～39
[9] 蔡 峰.北黄海盆地基底地质特征.海洋地质动态,1996,100(169):1～3CAIFeng.GeologicalfeatureofthebasementintheNorthYellowSeabasin.TrendsofMarineGeology,1996,100(169):1～3
[10] 王谦身,安玉林.南黄海西部及邻域重力场与深部构造.科学通报,1999,44(22):2448～2453WANGQianshen,ANYulin.GravityfieldanddeepstructureinthewesternpartofSouthYellowSeaandadjacentarea.ChineseScienceBulletin(inChinese),1999,44(22):2448～2453
[11] 郝天珧,刘伊克,段昶.根据重磁资料探讨中国东部及其邻域断裂体系.地球物理学报,1996,39(增刊):141～149HAOTianyao,LIUYike,DUANChang.ApproachingfaultsystemoftheEastChinaandadjacentareafromgravityandmagneticdata.ChineseJ.Geophys.(ActaGeophysicaSinica),1996,39(Suppl.):141～149
[12] 秦蕴珊,赵一阳,陈丽蓉等主编,黄海地质.北京:海洋出版社,1989QINYunshan,ZHAOYiyang,CHENLirong,etal.GeologyofYellowSea.Beijing:ChinaOceanPress,1989
[13] 刘光鼎主编.中国海区及邻域地质地球物理场系列图.北京:科学出版社,1992LIUGuangdinged.GeophysicalseriesmapsinChinaSeaandadjacentregions.Beijing:SciencePress,1992
[14] 郝天珧,刘伊克,徐万哲.黄海和邻区重磁场及区域构造特征.地球物理学进展,1998,13(1):27～39HAOTianyao,LIUYike,SUHMancheol.GravityandmagneticfieldfeaturesandtectonicscharacteristicsinYellowSeaandadjacentregion.ProgressinGeophysics,1998,13(1):27～39
[15] 徐佩芬.大别-苏鲁造山带与华北陆块东部岩石层三维速度结构[博士论文].北京:中国科学院地质与地球物理研究所,2001XUPeifen.SeismictomographybeneaththeDabieSulucollisionorogenanditsimplicationstotheformationandexhumationoftheultrahighpressuremetamorphicrocks[Ph.D .Dissertation].Beijing:InstituteofGeologyandGeophysics,CAS.2001
[16] 万天丰,朱 鸿,赵 磊等.郯庐断裂带的形成与演化:综述.现代地质,1996,10(2):159～168WANTianfeng,ZHUHong,ZHAOLei,etal.FormationandevolutionofTancheng lujiangfaultzone:areview.Geoscience,1996,10(2):159～168
[17] 王小凤,李中坚,陈柏林等.郯庐断裂带.北京:地质出版社,2000WANGXiaofeng,LIZhongjian,CHENBailin,etal.TanchengLujiangfault.Beijing:GeologicalPublishingHouse,2000
[18] 徐嘉炜,马国峰.郯庐断裂带研究的十年回顾.地质论评,1992,38(4):316～324XUJiawei,MAGuofeng.ReviewforthetenyearsofresearchonTancheng lujiangfault.GeologicalReview,1992,38(4):316～324
[19] 吴根耀,陈焕疆,马 力等.苏皖地块———特提斯演化阶段独立的构造单元.考古地理学报,2002,4(2):77～87WUGenyao,CHENHuanjiang,MALi,etal.SuWanBlock:Anindependenttectonicunitduringperiodoftethyanevolution.JournalofPalaeogeography,2002,4(2):77～87
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