Lithospheric Electrical Structure of the Qinling Orogen and its Geodynamic Implication
Lithospheric Electrical Structure of the Qinling Orogen and its Geodynamic Implication
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DOI：
10.1002/cjg2.3373
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发表时间：
2003-05
期刊：
影响因子：
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通讯作者：
Shunyou Cheng;Guo‐Wei Zhang;L. Li
中科院分区：
文献类型：
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作者：
Shunyou Cheng;Guo‐Wei Zhang;L. Li
通过对秦岭造山带岩石圈三维电性结构特征的详细研究，并结合其它地球物理和地质资料，发现自中新生代以来，特别是晚地质时期以来，由于华北陆块向南、扬子陆块向北向秦岭造山带的持续陆内俯冲，现今的腹地断限褶皱带（HLZ）和北秦岭厚皮叠瓦冲断带（NQZ），是由于南秦岭岩石圈楔入北秦岭岩石圈而叠加增厚，同时处于初始拆沉期。相反，SQZ正在经历拆沉和底侵作用，导致壳幔物质能量循环，佛坪地区可能形成新的地幔柱。此外，在秦岭造山带南北北方边界和内部岩石圈边界，还伴随着强烈的不同性质的岩石圈走滑断裂作用，导致物质的侧向转移。最后，探讨了岩石圈增厚与大规模构造拆沉和走滑断裂共存的地球动力学意义。
Studying in detail three-dimensional electrical structural features of lithospheres and combining with other geophysical and geological data in the Qinling orogenic belt, we find that since Mesozoic-Cenozic eras, particularly late-geological time, as a result of continuous intracontinental subduction beneath the Qinling orogen by the North China block (NCB) southward and the Yangtze block (YZB) northward, the present Hinterland fault-bounded fold zone (HLZ) and North Qinling thick-skinned imbricated thrust zone (NQZ), owing to the lithosphere of the South Qinling zone (SQZ) wedging into that of the NQZ, has a superimposed and thickened lithosphere and is simultaneously in initial delamination period. In contrast, the SQZ is undergoing delamination and underplating to cause mass-energy recycling between crust and mantle, and around the Foping region probably developing a new plume. In addition, between southern and northern as well as internal lithospheric boundaries of the Qinling orogen also accompany intensive lithospheric strike-slip faulting with different properties to lead to lateral mass transfer. Finally, we probe and discuss geodynamic implication of the coexistence of the thickened lithosphere and a large-scale tectonic delamination as well as strike-slip faulting.