西昆仑帕米尔逆掩推覆带结构分析
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摘要
综合利用地震剖面解释和地面地质资料分析,较为准确地揭示了位于西昆仑帕米尔逆掩推覆带的结构和变形特征。研究表明,帕米尔逆掩推覆带是帕米尔与南天山对冲碰撞带,呈东西走向,区内发育三、四排逆冲断层,且逆冲断层出露地表,反映出帕米尔向北逆冲推覆的特征。帕米尔逆掩推覆带由南向北的冲断作用表现为浅层滑脱的薄皮冲断为主,各次级断片成叠瓦状构造样式,其断片南倾的格局是由于来自南天山冲断系统深部双重冲断构造的背景下实现。
Based on various date such as 2D seismic profile and field geologic survey,the structural and deformation al features more accurately of fold-thrust belt in the Pamir,West Kunlun was disclosed.The study indicates that the Pamir overthrust nappe structure is the ramp collision belt of Pamir and Southern Tienshan fold-thrust belt,and shows east-west direction,the belt can be divided into several rows of surface thrust faults,the thrust faults exposed surface,reflecting the Pamir thrust northward features.Thin-shinned fold-thrust of detachment can be reacted by fold-thrust effection from south to north of the Pamir overthrust nappe structure,and the secondary fault section shows imbricate structure style,the south slope faults are controlled by deep duplex structure of the South Tienshan fold-thrust belt.
Based on various date such as 2D seismic profile and field geologic survey,the structural and deformation al features more accurately of fold-thrust belt in the Pamir,West Kunlun was disclosed.The study indicates that the Pamir overthrust nappe structure is the ramp collision belt of Pamir and Southern Tienshan fold-thrust belt,and shows east-west direction,the belt can be divided into several rows of surface thrust faults,the thrust faults exposed surface,reflecting the Pamir thrust northward features.Thin-shinned fold-thrust of detachment can be reacted by fold-thrust effection from south to north of the Pamir overthrust nappe structure,and the secondary fault section shows imbricate structure style,the south slope faults are controlled by deep duplex structure of the South Tienshan fold-thrust belt.
引文
[1]钱俊锋,肖安成,程晓敢,等.喀什北缘南天山冲断带构造变形分析[J].中国矿业大学学报(中文版),2008,37(4):538-544.
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[13]伍秀芳.塔里木盆地西南缘前陆褶皱冲断带构造几何学与运动学分析[D].杭州:浙江大学地球科学系,2003.
[14]伍秀芳,刘胜,汪新,等.帕米尔-西昆仑北麓新生代前陆褶皱冲断带构造剖面分析[J].地质科学,2004,39(2):260-271.
[2]曲国胜,Joseph Canerot,王宗起,等.造山带弧形构造一西昆仑-帕米尔弧及其预测[J].地质科学,1996,31:313-326.
[3]曲国胜,陈杰,陈新安,等.西昆仑-帕米尔造山带及其北缘前陆盆地板内构造变形[J].地质论评,1998,44(4):419-429.
[4]潘裕生.西昆仑山构造特征与演化[J].地质科学,1990,3:224-232.
[5]潘裕生.喀喇昆仑山-昆仑山综合考察导论[M].北京:气象出版社,1992:167-201.
[6]潘裕生.青藏高原第五缝合带的发现与论证[J].地球物理学报,1994,37(2):184-192.
[7]刘本培,王自强,张传恒,等.西南天山构造格局及演化[M].北京:中国地质大学出版社,1996:1-120.
[8]孙肇才.碰撞造山带与前陆盆地的演化[M].西北大学出版社,1993:85-95.
[9]何登发,李德生.塔里木盆地构造演化与油气聚集[M].北京:地质出版社,1996a.
[10]何登发,李德生.中国西北地区含油气盆地构造[J].石油学报,1996b,17(4):8-17.
[11]陈杰,曲国胜,胡军,等.帕米尔北缘弧形推覆构造带东段的基本特征与现代地震活动[J].地震地质,1997,19(4):301-312.
[12]肖安成,杨树锋,陈汉林,等.西昆仑山前冲断系的结构特征[J].地学前缘,2000a,7(B08):128-135.
[13]伍秀芳.塔里木盆地西南缘前陆褶皱冲断带构造几何学与运动学分析[D].杭州:浙江大学地球科学系,2003.
[14]伍秀芳,刘胜,汪新,等.帕米尔-西昆仑北麓新生代前陆褶皱冲断带构造剖面分析[J].地质科学,2004,39(2):260-271.
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