Reactivation and mantle dynamics of North China Craton: insight from P-wave anisotropy tomography
Reactivation and mantle dynamics of North China Craton: insight from P-wave anisotropy tomography
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华北克拉通的再激活和地幔动力学：纵波各向异性层析成像的见解
DOI：
10.1093/gji/ggt333
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发表时间：
2013-12
影响因子：
2.8
通讯作者：
Zhao, Dapeng
中科院分区：
文献类型：
--
作者：
Tian, You;Zhao, Dapeng
我们利用大量当地地震和远震事件的高质量到达时资料，首次确定了北中国克拉通下的3-DP波各向异性层析成像，揭示了600公里以下地壳和上地幔随深度变化的方位各向异性。NCC西部地块的快速度方向(FVD)从南部的东西向到北部的东北-西南方向变化，可能反映了扬子地块与NCC的相互作用，也可能反映了克拉通内的古岩石圈组构。在NCC东部地块下，上地幔下部(300-410 km深度)和地幔过渡带(410-660 km深度)出现了一条均匀的西北-东南向FVD，这可能反映了地幔过渡带中停滞太平洋板块上方的大地幔楔体(BMW)的水平和上升流。NCC中央地块呈东北-西南方向的FVD，与地表构造方向一致，表明NCC西部地块冷厚(>；300 km)的克拉通根部可能阻挡了太平洋板块俯冲引起的西北-东南方向的地幔流动，从而导致中心地块下方的东北-西南方向的地幔流动。我们的研究结果表明，与太平洋板块的深俯冲有关的宝马转角流是东中国盆地核壳体再活化和地幔动力学的主要原因。
We determined the first 3-DP-wave anisotropic tomography beneath the North China Craton (NCC) using a large number of high-quality arrival-time data from local earthquakes and teleseismic events, which reveals depth-dependent azimuthal anisotropy in the crust and upper mantle down to 600 km depth. In the NCC western block, the fast velocity direction (FVD) varies from east–west in the southern part to northeast–southwest in the northern part, which may reflect either the interaction between the Yangtze block and NCC or fossil lithospheric fabrics in the craton. Under the NCC eastern block, a uniform northwest–southeast FVD is revealed in the lower part of the upper mantle (300–410 km depths) and the mantle transition zone (410–660 km depths), which may reflect horizontal and upwelling flows in the big mantle wedge (BMW) above the stagnant Pacific slab in the mantle transition zone. The NCC central block exhibits a northeast–southwest FVD, consistent with the surface tectonic orientation there, suggesting that the cold and thick (>300 km) cratonic root of the NCC western block may obstruct the northwest–southeast trending mantle flow induced by the Pacific Plate subduction, resulting in a northeast–southwest trending mantle flow under the central block. Our present results indicate that the corner flow in the BMW associated with the deep subduction of the Pacific Plate is the main cause of NCC reactivation and mantle dynamics under East China.
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影响因子：
2.9
作者：
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DOI：
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期刊：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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