冲绳海槽中段线性磁条带异常及其构造发育
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摘要
通过对磁场分析发现 ,冲绳海槽中段存在线性磁异常 ,说明海槽轴部地壳已经发生破裂 ,新鲜洋壳已经生成 ,目前已进入扩张阶段 .通过对磁条带和地震地层的研究得出如下结论 :冲绳海槽的张裂具有Ⅲ幕模式 ,即中到晚中新世的开裂幕 (Ⅰ幕 )、上新世—早更新世的拉张幕 (Ⅱ幕 )以及近代的扩张幕 (Ⅲ幕 ) .冲绳海槽中段的地磁场特征和已发生扩张的红海中段的磁场非常相似 ,说明冲绳海槽可能正向着“红海阶段”过渡发展
Linear magnetic anomalies have been found in the middle Okinawa Trough, it means that the continental crust has broken in the extension axis, oceanic crust has been formed. There is a three extension phases model in the Okinawa Trough, namely, “doming” from middle Miocene to early Pliocene (PhaseⅠ),“extension” from Pliocene to early Pleistocene (Phase Ⅱ), and recent “spreading” (Phase Ⅲ). The magnetic anomalies for the middle Okinawa Trough are very similar to those found in the Red Sea, which shows that developing of the Okinawa Trough is going to “Red Sea stage”. Being similar to the Red Sea, there are a “main trough” and a “axial trough” in the Okinawa Trough.
Linear magnetic anomalies have been found in the middle Okinawa Trough, it means that the continental crust has broken in the extension axis, oceanic crust has been formed. There is a three extension phases model in the Okinawa Trough, namely, “doming” from middle Miocene to early Pliocene (PhaseⅠ),“extension” from Pliocene to early Pleistocene (Phase Ⅱ), and recent “spreading” (Phase Ⅲ). The magnetic anomalies for the middle Okinawa Trough are very similar to those found in the Red Sea, which shows that developing of the Okinawa Trough is going to “Red Sea stage”. Being similar to the Red Sea, there are a “main trough” and a “axial trough” in the Okinawa Trough.
引文
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[2 ] KIMURAMasaaki.Back arcriftingintheOkinawaTrough[J].MarineandPetroleumGeology ,1985 ,2 :2 2 2～ 2 39.
[3] 金翔龙 ,喻普之 .冲绳海槽的构造特征与演化 [J].中国科学 (B辑 ) ,1987,2 (2 ) :196～ 2 0 3.
[4 ] 梁瑞才 ,王 勇 ,韩树桥 .冲绳海槽北段地磁场持征及其地质解释 [J].青岛海洋大学学报 ,1999,2 9(4 ) :715～ 72 0
[5 ] 翟世奎 ,干晓群 .冲绳海槽海底热液活动区玄武岩的矿物学和岩石化学特征及其地质意义 [J].海洋与湖沼 ,1995 ,2 6(2 ) :115～ 12 3 .
[6 ] 王舒畋 ,梁寿生 .冲绳海槽盆地的地质构造特征与盆地演化历史 [J].海洋地质与第四纪地质 ,1986 ,6 (2 ) :17～ 2 9.
[7] LEEChao Shing .OkinawaTrough :originofaback arcbasin[J].MarineGeology ,1980 ,35 :2 19～ 2 41.
[8] COCHRANJamesR .AModelforDevelopmentofRedSea[M ].TheAmericanAssociationofPetroleumGeologists,1982 .41～ 6 9.
[9] 李乃胜 .冲绳海槽地热 [M ].青岛 :青岛出版社 ,1995 .83～ 88.
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