冲绳海槽中段磁异常特征  

Magnetic Anomaly Characteristics in the Middle Okinawa Trough

作　　者：梁瑞才[1] 刘育丰 王俊勤 王勇[1] 苏天赟[1] 吴金龙[1] 

机构地区：[1]国家海洋局第一海洋研究所,山东青岛266061 [2]中海石油研究中心,北京100027

出　　处：《海洋科学进展》2002年第4期19-26,共8页Advances in Marine Science

基　　金：国家"863"高新技术重大专项--数字海底技术渤海油田示范区的建设(2001AA60 2019)资助项目

摘　　要：磁异常显示在东海陆架坳陷带以降低负磁异常为主 ,而陆架边缘隆褶带异常区则以跳跃升高的正磁异常为主 ,冲绳海槽异常区表现出 2种磁异常面貌 :在西部陆坡表现为较平缓的负磁异常 ,而冲绳海槽底部则表现为高频跳跃变化升高异常。琉球岛弧异常区则表现为降低平缓负磁异常 ,只有在靠近冲绳海槽一带表现为高频升高正磁异常。磁力异常在这几个构造带显示出明显的条带状分布特征。在测区的中南部 (2 7°4 0′ N ,12 7°0 0′ E附近 ) ,磁异常呈现出明显的磁条带特征 ,与海底地形吻合很好 。Itis shown from the magnetic anomaly data thatthe shelf depression zone is characteristic of de- creasing negative magnetic anomalies,and the shelf edge folded belt is characteristic of jump- increasing positive anomalies;the Okinawa Trough area shows 2 types of magnetic anomalies,its west slop area is characteristic of gentle negative magnetic anomalies,and its through area is characteristic of increasing magnetic anomalies with high frequency fluctuation.The Ryukyu Island arc area is characteristic of gently decreasing negative magnetic anomalies,butthe island arc area near the Okinawa Trough is characteristic of high frequency increasing positive magnetic anomalies.The magnetic anomalies in these tectonic belts show significantly banded distributions,the magnetic anomalies in the southern survey area( near2 7°40′ N,1 2 7°0 0′ E) show obviously banded feature and are well consistent with the bottom topography,which indicates thatthe middle Okinawa Trough has entered a spreading stage.

关 键 词：冲绳海槽 磁异常 海底地形 扩张 磁条带特征 东海 陆架坳陷带 

分 类 号：P738.3[天文地球—海洋地质] P736.[天文地球—海洋科学]