利用深地震反射剖面研究北祁连─河西走廊地壳细结构
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摘要
在北祁连－河西走廊测制了一条深反射地震剖面．查明测区莫霍界面深４０－５０ｋｍ，向南倾向祁连山区．北祁连山前逆掩断裂面南倾，上陡下缓消失于３．５－４ｓ处（可能是滑脱带）．阿尔金断裂向东延伸到宽滩山深部，倾向南，下切到下地壳．阿尔金断裂带与北祁连道冲断裂带吸收了印度板块向北推移产生的压应力．
A 94 kilometer long deep seismic reflection profile was completed from northern Qilianmountain to Hexi corridor in Gansu province of China. The Moho is about 40─50 km deepand tilts southwards to Qilian mountain. The North Qilian Front Thrust is also dippingsouthwards, steeply in shallow with decreasing dip to merge with a reflection energy zone at3. 5─4 s, probably coming from a detechment. The Altun fault zone is likely extending eastto Kuantanshan, also inclined southerly and reaches the lower crust. It is the Altun faultzone and the North Qilian Front Thrust which absorb the press stress in Qilian regioncaused by the indian plate's northward movement.
A 94 kilometer long deep seismic reflection profile was completed from northern Qilianmountain to Hexi corridor in Gansu province of China. The Moho is about 40─50 km deepand tilts southwards to Qilian mountain. The North Qilian Front Thrust is also dippingsouthwards, steeply in shallow with decreasing dip to merge with a reflection energy zone at3. 5─4 s, probably coming from a detechment. The Altun fault zone is likely extending eastto Kuantanshan, also inclined southerly and reaches the lower crust. It is the Altun faultzone and the North Qilian Front Thrust which absorb the press stress in Qilian regioncaused by the indian plate's northward movement.
引文
［1］甘肃省地质矿产局，甘肃区域地质志，北京：地质出版社，1989．［2］李庆山，河西走廊西部地区的活动构造特点，见：赵国光主编，地壳构造与地壳应力文集5，北京：地质出版社，38－49，1991．［3］王多杰，赤金堡－金塔断裂带的基本特征及有关问题的讨论，内陆地震，2（2），142－146，1988．［4］胡军，阿尔金断裂及其区域意义，内陆地震，1（1），1－9，1987．［5］郑剑东，阿尔金断裂与大陆走滑断裂，内陆地震，2（2），123－130，1988．［6］范东琴，阿尔金地区构造应力场研究，内陆地震，7（4），370－378，1993．
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