The complex 660 km discontinuity beneath eastern of North China
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摘要: 利用华北固定台网的宽频带地震远震记录波形资料,提取P波接收函数,通过偏移成像和共转换点叠加,得到华北地区东部地幔过渡带深度及厚度的图像.研究结果显示,地幔过渡带上界面(410 km间断面)深度起伏变化不大;在华北地区东部,存在较厚的地幔过渡带,地幔过渡带下界面(660 km间断面)在660 km深度附近出现两个不同的界面.造成地幔过渡带增厚并出现两个深度不同的界面的原因可能是存在橄榄岩以外的地幔物质相变,该物质相变拥有与橄榄岩向钙钛矿转变不同的克拉伯龙斜率,太平洋俯冲板块的低温造成两种不同的相变界面发生不同程度的改变.双重660 km间断面的范围存在向北西方向延伸的趋势并且向南至少延伸到30°N.本文的结果可为古西太平洋板块向华北俯冲前缘位置的研究提供约束.
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关键词:
- 地幔过渡带 /
- 双层660 km间断面 /
- 华北 /
- 接收函数
Abstract: The P-wave receiver functions were obtained from the teleseismic waveform data recorded by the permanent stations in the east of north China. The mantle transition zone was imaged by migrating and common conversion point stacking of receiver functions. The results show that the 410 km discontinuity is flat and influenced slightly by Western Pacific subduction slabs. But two sharp discontinuities near the depth of 660 km are found in the east of the study region. It may derive from some other components transported by the subduction slabs into the mantle transition zone, and the Clapeyron slope of the immigrated components is different from the slope of olivine to perovskite. So the low temperature brought by the subduction slabs makes the discontinuities separate with each other. The front of double 660 km discontinuities shows a north-west trending and extends southward to the latitude of 30°N. Our results may be taken as an indication of the location of the Western Pacific subduction slabs beneath the north China.-
Key words:
- Mantle transition zone /
- Double 660 km discontinuities /
- North China /
- Receiver funtion
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