SOME CHARACTERISTICS OF DEEP STRUCTURE OF THE ZHANGZHOU GEOTHERMAL FIELD AND IT'S NEIGHBOURHOOD IN THE FUJIAN PROVINCE
SOME CHARACTERISTICS OF DEEP STRUCTURE OF THE ZHANGZHOU GEOTHERMAL FIELD AND IT'S NEIGHBOURHOOD IN THE FUJIAN PROVINCE
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发表时间：
1991
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通讯作者：
S. Xiong
中科院分区：
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作者：
S. Xiong
1985-1986年在福建漳州地热田进行了北北东向地震折射剖面测量。利用一、二维射线追踪、合成地震记录拟合和反演等方法，结果表明：漳州地热田正处于地壳厚度突变区，地壳从漳州市区向南向海岸方向隆起，地壳厚度仅为29.5km。在地壳结构突变处，地壳中的地震速度界面全部弯曲甚至断裂，这可能是一条断裂带。在中上地壳存在横向有限伸展的P波低速带。低纬带的速度小于5.80 km/s，顶深大于10.0 km。低纬带位于漳州地热田下方的地壳中，处于地壳突变带。这表明低纬带是地热场的深源，可能是部分熔融体。
A seismic refraction profile in the NNE direction passing the Zhangzhou geothermal field in the Fujian Province carred out in 1985-1986. By use of one- and two-dimensions ray tracing, synthetic seismograms fitting and inversion etc., a detailed image of structure and velocity distribution of the crust and uppermost mantle in the region has been obtained.The result shows that: The Zhangzhou geothermal field is just located an area that the crustal thickness changes suddenly there- The crust uplifts in the direction from the Zhangzhou city to the seacoast in the south, and the crustal thickness is only 29.5 km there. But it increases rapidly to about 32.0 km to the north.At the suddenly changed position of the crustal structure, all the seismic velocity interfaces in the crust has been crooked or even broken, this suggests probably a fault belt. There is a P-wave low-velocity zone (LVZ), which is a limited extension laterally, in the middle-upper crust. The velocity of the LVZ is less than 5.80 km/s and it's top depth is more than 10.0 km. The LVZ is just located in the crust beneath the Zhangzhou geothermal field and at the suddenly changed zone of the crust. It suggests that the LVZ is the deep source of the geothermal field and it is probably a portion meltting body.