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首页> 外文期刊>Physics of the Earth and Planetary Interiors: A Journal Devoted to Obsevational and Experimerntal Studies of the Chemistry and Physics of Planetary Interiors and Their Theoretical Interpretation >Seismic imaging of the crust and upper mantle beneath the North China Craton
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Seismic imaging of the crust and upper mantle beneath the North China Craton

机译：华北克拉通下方地壳和上地幔的地震成像

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摘要

We determined three-dimensional (3D) P-wave velocity structure down to 600km depth beneath the North China Craton using 149,054 arrival times from 7940 local and regional earthquakes, and 193,085 data from 12,657 teleseismic events. which were recorded by 585 seismic stations ill our study region. Our-tomographic images show some new features. Prominent low-velocity (low-V) and high-velocity (high-V) anomalies are imaged beneath the North China Basin, Trans-North China Orogen, and the cratonic Ordos Block. A lithospheric root of over 250 km thick is imaged clearly beneath the Ordos block. A high-Vanomaly which may represent the subducting Pacific slab is imaged in the mantle transition zone beneath the eastern edge of the study area. A few other high-V zones are also imaged in the deep portion of the upper mantle, which may reflect the stagnant Pacific slab and detached Archaean continental lithosphere. Two prominent low-V anomalies are imaged beneath the North China Basin, which may reflect asthenospheric upwelling associated with the deep subduction of the Farallon and Pacific plates since late Mesozoic. We consider that the lithospheric thinning of the eastern part of the North China Craton was Caused by the long-term replacement, metamorphism, and chemical and thermal erosion of the ancient lithosphere by the hot asthenosphere.
机译：我们使用来自7940次本地和区域地震的149,054次到达时间，以及来自12,657次远程地震事件的193,085次数据，确定了华北克拉通下方至600 km深度的三维（3D）P波速度结构。在我们的研究地区，有585个地震台站记录了这些记录。我们的断层图像显示了一些新功能。在华北盆地，华北北部的造山带和克拉通的鄂尔多斯地块下方成像了明显的低速（低伏）和高速（高伏）异常。鄂尔多斯地块下方清楚地成像了厚度超过250公里的岩石圈根。在研究区域东部边缘以下的地幔过渡带中，可以成像出一个高涡度，可能代表俯冲的太平洋板块。在上地幔的深部还成像了其他一些高V区，这可能反映了太平洋板块停滞和古罗马大陆岩石圈分离。在华北盆地下方成像了两个明显的低伏异常，这可能反映了自中生代晚期以来与法拉隆和太平洋板块的深俯冲有关的软流圈上升。我们认为华北克拉通东部的岩石圈变薄是由热流软流圈的长期替换，变质以及古代岩石圈的化学和热侵蚀引起的。

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