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首页> 外文期刊>Journal of Asian earth sciences >Intraplate volcanism and mantle dynamics of Mainland China: New constraints from shear-wave tomography
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Intraplate volcanism and mantle dynamics of Mainland China: New constraints from shear-wave tomography

机译：中国大陆的板内火山活动和地幔动力学：剪切波层析成像的新限制

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We determine a new model of S-wave velocity (Vs) tomography beneath Mainland China and surrounding areas by inverting 321,666 S-wave arrival times from 15,618 events recorded by the China Seismic Network (CSN) and at stations in East Asia compiled by the International Seismological Center (ISC). The obtained 3-D Vs model has a generally good resolution down to the uppermost lower mantle, which provides important constraints on the deep structure and origin of intraplate volcanoes in Mainland China. We find a prominent low-Vs body in the upper mantle beneath the Tengchong volcano, which is caused by subduction and rollback of the Burma microplate (or the Indian plate) as well as regional extension of the overriding Eurasian plate. A low-Vs structure is visible beneath the Hainan volcano and it is dominant in two localized zones: one is near the 410-km discontinuity and the other is in the shallow mantle. This feature is compatible with results predicted by the thermochemical plume model. Our Vs tomography reveals a gap between the subducted Indian slab and the Tarim lithosphere beneath the Ashi volcano in northern Tibet, suggesting that hot mantle upwelling could pass through the gap to feed the volcanism in the Ashikule Volcanic Basin. The Datong volcano is underlain by a broadly inclined low-Vs anomaly extending to a depth of similar to 410 km, which possibly reflects focused upwelling produced by avalanche of the stagnant Pacific slab from the mantle transition zone (MTZ) to the lower mantle.
机译：我们通过反转中国地震台网（CSN）记录的15618次事件以及国际地震台编撰的东亚台站中的321666次S波到达时间，来确定中国大陆及周边地区的S波速度（Vs）层析成像的新模型地震中心（ISC）。所获得的3-D Vs模型到下地幔的最上层都具有良好的分辨率，这对中国大陆板内火山的深部结构和成因提供了重要的限制。我们在腾冲火山下方的上地幔中发现了一个突出的低Vs体，这是由于缅甸微板块（或印度板块）的俯冲和回滚以及上覆欧亚板块的区域扩展引起的。在海南火山下面可以看到低Vs结构，它在两个局部区域占主导地位：一个在410公里不连续处附近，另一个在浅地幔中。此功能与热化学羽流模型预测的结果兼容。我们的Vs层析成像显示，俯冲的印度板块与西藏北部阿什火山下方的塔里木盆地岩石圈之间存在缝隙，这表明热幔向上流可以穿过缝隙，以充实阿库库勒火山盆地中的火山岩。大同火山的底部是一个大倾角的低Vs异常，其延伸到大约410 km的深度，这可能反映了停滞的太平洋板块雪崩从地幔过渡带（MTZ）到下地幔的集中上升流。

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