Gravity and Magnetic Field Characteristics in the Covered Area of Eastern Segment of the Qilian Orogenic Belt and the Delineation of the Northern and Central Qilian Tectonic Boundaries
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摘要:
祁连造山带东段覆盖区处于青藏高原东北缘与阿拉善地块、鄂尔多斯地块交汇地带，亦为秦岭造山带与祁连造山带相互作用的部位，构造格局复杂，目前对该区内北祁连和中祁连构造单元边界的划分仍然值得商榷。笔者采用归一化总水平导数垂向导数（NVDR-THDR）、最小曲率位场分离技术，结合小波多尺度分析对布格重力异常及化极磁力异常进行处理分析，综合区域地质特征推断一级断裂4条，二级断裂54条，一级断裂为构造单元边界。在祁连造山带东段覆盖区，中祁连与北祁连的构造边界以平安–乐都–定西–张家川一线为界，即中祁连北缘断裂所在。中祁连与北祁连之间存在1个一级构造单元—北祁连增生楔，祁连造山带东段覆盖区可划分为北祁连岛弧带、北祁连增生楔和中祁连造山带3个构造单元。
Abstract:The eastern segment of the Qilian orogenic belt is situated at the northeastern edge of the Qinghai-Tibetan Plateau, intersecting with the Alxa Massif and Ordos Massif. This region also serves as a transitional zone between the Qinling orogenic belt and the Qilian orogenic belt. The tectonic framework in this region is highly complex, and the current understanding of the boundaries between the north Qilian and central Qilian tectonic units remains relatively limited. In this study, we applied the normalized vertical derivative of the total horizontal derivative (NVDR-THDR), minimum curvature field separation, and wavelet multi-scale decomposition to process and analyze Bouguer gravity anomalies and the magnetic anomalies reduced to the pole. By integrating regional geological characteristics, we inferred four primary faults and fifty-four secondary faults. The primary faults delineate the boundaries of tectonic units. Specifically, the boundary between the Qilian and North Qilian tectonic units is traced by a linear segment connecting Ping'an-Ledu-Dingxi-Zhangjiachuan, corresponding to the northern edge fault of the Qilian Mountains. Furthermore, there exists a prominent first-class tectonic unit known as the north Qilian accretionary wedge between central Qilian and north Qilian units. The eastern coverage area of the Qilian orogenic belt can be divided into three tectonic units: the northern Qilian island arc belt, the Northern Qilian accretionary wedge, and the central Qilian rogenic belt.
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