%0 Journal Article %T 南海北部陆坡晚白垩世构造逆冲及其成因<br>Lata Cretaceous Tectonic Thrusting and Its Genesis in Northern Slope of South China Sea %A 王长势 %A 朱伟林 %A 钟 锴 %A 许长海< %A br> %A WangZhangshi %A ZhuWeilin %A ZhongKai %A XuChanghai %J 地球科学(中国地质大学学报) %D 2015 %R 10.3799/dqkx.2015.135 %X 地震资料显示南海北部中生界发育褶皱和逆冲断层等挤压构造,但目前对其成因仍存在争议.通过对南海北部珠江口 盆地东南部陆坡的二维地震剖面进行研究,发现在云荔低隆起-兴荔凸起-兴宁凹陷一带存在2条近NWSE走向并往NE 方向逆冲的逆断层,在东沙隆起南部有2条近南-北走向并具有压扭性质的走滑断层,上述4条断层的平面延伸距离分别约 为130、110、55和58km.综合分析可知,现今位于南海南部的礼乐-巴拉望地块经中侏罗世-早白垩世与华南陆缘发生软碰 撞后,在晚白垩世与华南陆缘在现今荔湾-兴宁凹陷一带进行最后的“焊接缝合”,而上述4条断层可作为该次“焊接缝合”的 间接证据.由于太平洋向华南的俯冲板片在晚白垩世发生了后撤,华南大陆边缘在晚白垩世末开始张裂之前可能整体为区域 均衡抬升、局部陆-陆碰撞缝合的构造格局.<br>TherearefoldsandthrustfaultsinMesozoicstratainthenortherncontinentalmarginoftheSouthChinaSea,how ever,theirgenesesarestillincontroversy.Inthisstudy,2DseismicprofilesinthesoutheastregionofthePearlRiverMouth basin(PRMB)areinterpreted.TwonortheastwardsthrustingfaultswithapproximatelyNWSEstrikeareidentifiedinthearea ofYunliloweruplift,XingliriseandXingningsag,andtwoapproximatelynorthsouthstrikingcompressionalstrikeslipfaults aredistinguishedinthesouthernareaofDongshauplift.The4faultsmentionedaboveareabout130,110,55and58kmlong, respectively.ItcanbeconcludedthattheLiyue(Reed)BankPalawanblockwhichliesinthesoutherncontinentalmarginofthe SCSunderwentasoftcollisionwithSouthChinacontinentalmarginin MiddleJurassictoEarlyCretaceous,andtheyfinally unitedandsuturedinLateCretaceousapproximatelyalongLiwantoXingningsags.Theaforementioned4faultsmaybethe circumstantialevidencesforthefinalunitingandsuturingbetweentheLiyueBankPalawanblockandtheSouthChinacontinen talmarginintheLateCreta %K 南海北部陆缘 %K 乐-巴拉望地块 %K 晚白垩世 %K 逆冲断层 %K 走滑断层 %K 碰撞缝合 %K 均衡抬升 %K 海洋地质< %K br> %K northerncontinentalmarginoftheSouthChinaSea %K Liyue(Reed)BankPalawanblock %K LateCretaceous %K thrusting %U http://www.earth-science.net/WebPage/Article.aspx?id=3154