东秦岭邓县—南漳反射地震剖面及其构造意义
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摘要
邓县—南漳剖面是叶县—邓县剖面南延部分,其反射地震剖面的测定使得从中朝克拉通到扬子克拉通横穿秦岭造山带的第一条反射地震剖面得以完成。邓县—南漳反射地震剖面清楚显示了扬子克拉通地壳俯冲到秦岭造山带之下的客观事实,证明襄樊—广济断裂带(即北大别山—大巴山前缘断裂带)并不是一条板块缝合带,而是一条大陆壳俯冲断裂带,扬子克拉通的大陆地壳沿大约20km深的上地壳底面向秦岭造山带之下俯冲。
The reflection seismic profile from Dengxian to Nanzhang is the southward extension of the re-flection seismic profile from Yexian to Dengxian.The completion of this profile declared the first reflection seismic profile from the Sino-Korean craton to the Yangtze craton,across the Qinling orogen.The Dengxian-Nanzhang reflection profile clearly shows the fact that the crust of the Yangtze craton was sub-ducted beneath the Qinling orogen and gives evidence that the Xianyang-Guangji fault(i.e.the North Dabie-Daba frontal fault-fold zone)is not a plate suture,but a continental crustal subducting fault.The crust of the Yangtze craton was subducted beneath the Qinling orogen along the bottom of the upper crust at a depth of about 20km.
The reflection seismic profile from Dengxian to Nanzhang is the southward extension of the re-flection seismic profile from Yexian to Dengxian.The completion of this profile declared the first reflection seismic profile from the Sino-Korean craton to the Yangtze craton,across the Qinling orogen.The Dengxian-Nanzhang reflection profile clearly shows the fact that the crust of the Yangtze craton was sub-ducted beneath the Qinling orogen and gives evidence that the Xianyang-Guangji fault(i.e.the North Dabie-Daba frontal fault-fold zone)is not a plate suture,but a continental crustal subducting fault.The crust of the Yangtze craton was subducted beneath the Qinling orogen along the bottom of the upper crust at a depth of about 20km.
引文
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[2]HuangTK.OnMajorTectonicFormsofChina[J].GeologicalMemoirs,Ser.A,1945,(20):165.
[3]任纪舜,姜春发,张正坤,等.中国大地构造及其演化[M].北京:科学出版社,1980.
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[5]张国伟,张本仁,袁学诚,等.秦岭造山带与大陆动力学[M].北京:科学出版社,2001.
[6]张二朋.秦岭—大巴山及邻区地质图(1∶100万)[M].北京:地质出版社.1992.
[7]任纪舜,陈廷愚,牛宝贵,等.中国东部及邻区大陆岩石圈的构造演化与成矿[M].北京:科学出版社,1990.
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