Structure of the mantle transition zone beneath the central and western North China Craton and its adjacent areas revealed by P wave receiver functions
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摘要: 通过处理ChinArray计划二期和三期台阵中823个台站的远震波形数据，共获得174 562个高质量的P波接收函数，采用接收函数共转换点（CCP）叠加方法开展华北克拉通中西部及其邻区的地幔转换带结构研究，获得了研究区地幔转换带的厚度分布。结果表明：研究区内地幔转换带厚度变化幅值在235—280 km范围内，具有分区特征；阿尔金断裂带东部和汉诺坝火山以北厚的转换带异常可能与冷的岩石圈拆沉有关；河套盆地和阴山造山带附近分布着相对薄的地幔转换带，这可能暗示了该地区存在热的地幔物质上涌或岩浆活动；渤海湾盆地下方厚的地幔转换带异常可能是冷的太平洋板片西向俯冲并滞留于地幔转换带所致。Abstract: We obtained a total of 174 562 high quality P wave receiver functions by processing the teleseismic waveform data recorded by 823 temporary seismic stations of ChinArray phase Ⅱ and Ⅲ deployments, and then used the receiver function common conversion point （CCP）stacking method to study the structure of the mantle transition zone beneath the central and western North China Craton and its adjacent areas. The estimated thickness of the mantle transition zone in this studied area varies from 235 km to 280 km and shows partitioned characteristics. The thick mantle transition zones beneath the eastern Altyn Tagh fault belt and the northern Hannuoba volcano may be related to the detachment of the cold lithosphere. The mantle transition zones beneath the Hetao basin and the Yinshan orogenic belt are thinner than the average of the global mantle transition zone, which maybe imply the upwelling of the hot mantle materials or magma activities. The anomaly of the thicker mantle transition zone beneath the Bohai Bay basin may be caused by the westward subduction of the cold Pacific plate and its remaining in the mantle transition zone.
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图 1 研究区地震观测台站位置与区域构造背景
TA Ⅱ和TA Ⅲ分别表示中国地震局地球物理研究所组织实施的第二期和第三期流动观测台阵；61061为位于鄂尔多斯地块内的台站
Figure 1. Locations of the seismic stations and regional tectonic settings in the studied area
TA Ⅱ and TA Ⅲ represent the temporary seismic stations of ChinArray phase II and III deployments respectively organized by Institute of Geophysics，China Earthquake Administration. 61061 is the station located in Ordos block
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图 3 61061台站按震中距排列的接收函数
每条接收函数为震中距5°范围内所有接收函数的叠加结果，四条红色虚线分别表示转换震相Pms，PpPs，P410s和P660s的理论走时
Figure 3. Receiver functions plotted as a function of the epicentral distance at station 61061
Each receiver function indicates the stacking of receiver functions binned every 5° in epicentral distance. Four red dashed lines represent the theoretical arrival times of Pms，PpPs，P410s and P660s phases
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图 6 地幔转换带厚度分布
红色椭圆和矩形分别为厚和薄的地幔转换带厚度异常区，下同
Figure 6. Distribution of the mantle transition zone thickness
Red ellipses and rectangles indicate the thick or thin thickness anomalous regions of the mantle transition zone, the same below
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图 7 520 km深度的P波速度结构 （引自Tao et al，2018）
Figure 7. P wave velocity structure at 520 km depth （after Tao et al，2018）
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