Crustal P-wave velocity distributions and metallotectonics around the North China Craton
Crustal P-wave velocity distributions and metallotectonics around the North China Craton
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DOI：
10.1144/sp280.15
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
X. Chang;Y. Liu;Mingguo Zhai;Yanghua Wang
中科院分区：
文献类型：
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作者：
X. Chang;Y. Liu;Mingguo Zhai;Yanghua Wang
摘要收集了华北克拉通的地震资料，进行了高分辨率地震层析成像，分析了地壳地震速度分布与区域构造成矿作用的关系。在上地壳和中地壳，速度异常沿东西向和北北东—西南向构造分布。华北克拉通新生代金矿带多与高速异常带重合，华北盆地多与低速异常带重合。与上地壳相比，下地壳的低速异常较为分散和广泛，表明高温物质从地幔上涌。下地壳中的高温物质提供了浮力、热的矿化流体，这些流体抬升并形成了上地壳的白垩纪矿床。
Abstract We have collected seismic data, performed high-resolution seismic tomography in the North China Craton and analysed the relationships between crustal seismic velocity distributions and regional tectonics and metallogenesis. In the upper and middle crust velocity anomalies are distributed along east–west- and NNE–SSW-trending structures. Most belts of Cenozoic mineral deposits including gold in the North China Craton coincide with high-velocity anomalies, and the North China basin coincides with a low-velocity zone. Compared with the upper crust, the low-velocity anomalies in the lower crust are diffuse and extensive, which suggests that high-temperature material has upwelled from the mantle. High-temperature material in the lower crust provided buoyant, hot, mineralizing fluids that uplifted and formed the Cretaceous mineral deposits in the upper crust.