Mantle Transition Zone Structure Beneath Southeastern China and its Implications for Stagnant Slab and Water Transportation in the Mantle
Mantle Transition Zone Structure Beneath Southeastern China and its Implications for Stagnant Slab and Water Transportation in the Mantle
复制标题
中国东南部地幔过渡带结构及其对地幔停滞板片和水运移的意义
DOI：
10.1007/s00024-014-0837-4
复制
发表时间：
2014
影响因子：
2
通讯作者：
Jiang Xiaohuan
中科院分区：
文献类型：
--
作者：
Huang Rong;Xu Yixian;Luo Yinhe;Jiang Xiaohuan
我们利用121个中国永久地震台站的共转换点叠加波接收函数，确定了中国东南部410和660公里的结构面深度变化。然后将结果与地震速度变化相结合，估计了该地区地幔过渡带的温度和含水量变化。以前的层析成像研究表明，东亚的地幔过渡带中有一个停滞的板块，与西太平洋的俯冲有关。得到的温度变化清晰地勾勒出停滞板的形状，其西缘在113.5E，南缘在28.5N。停滞板块的位置与地表构造的对比表明，中国东部新生代的伸展与西太平洋的俯冲和东移密切相关。停滞板块的含水率低于周围板块，表明水已经从俯冲板块释放到上地幔。
We determined depth variation of the 410- and 660-km discontinuities beneath southeastern China by common-converted-point stacking of-wave receiver functions of 121 permanent Chinese seismic stations. We then combined the results with seismic velocity variation to estimate temperature and water content variations in the mantle transition zone of the region. Previous tomographic studies have shown a stagnant slab in the mantle transition zone in eastern Asia that is connected to subduction of the western Pacific. Temperature variations obtained clearly outline the shape of the stagnant slab, with its western edge at 113.5E and the southern edge at 28.5N. The correlation between the location of the stagnant slab and surface tectonics suggests that the Cenozoic extension in eastern China is closely associated with the subduction of the western Pacific and its eastward migration. The water content of the stagnant slab is lower than in surrounding slabs, suggesting that the water has already been released from the subducting slab into the upper mantle.