Crust and Uppermost Mantle Magma Plumbing System Beneath Changbaishan Intraplate Volcano, China/North Korea, Revealed by Ambient Noise Adjoint Tomography
Crust and Uppermost Mantle Magma Plumbing System Beneath Changbaishan Intraplate Volcano, China/North Korea, Revealed by Ambient Noise Adjoint Tomography
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DOI：
10.1029/2022gl098308
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发表时间：
2022-06
影响因子：
5.2
通讯作者：
Xing-Zhao Fan;Zhen Guo;Yang Zhao;Qi-fu Chen
中科院分区：
文献类型：
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作者：
Xing-Zhao Fan;Zhen Guo;Yang Zhao;Qi-fu Chen
长白山火山（CBV）位于中朝边境，是地球上最具吸引力的爆发性火山之一，它在全新世爆发规模巨大，岩浆成分异常，处于大陆板内环境。尽管它的规模巨大，过去曾有过破坏性的历史，但其潜在的岩浆管道系统仍然存在争议，人们对其知之甚少。我们通过对中国和朝鲜记录的地震环境噪声数据应用先进的三维全波形伴随层析成像，提出了CBV的高分辨率三维地壳和上地幔S波速度（Vs）模型。新获得的地震图像详细描述了CBV下方岩浆管道系统的3D结构，其特征是存在一个突出的下地壳糊状物区，估计熔融分数为1.5%-3.6%，其来源于上涌的软流圈通过最上部地幔区域的垂直狭窄管道，估计熔融分数为1.6%。
Changbaishan volcano (CBV), straddling the border between China and North Korea, is one of the most intriguing and explosive volcanoes on Earth owing to its voluminous Holocene eruptions and unusual magma composition within a continental intraplate setting. Despite the enormous size and destructive past, its underlying magma plumbing system remains debated and poorly understood. We present a refined high‐resolution 3D crust and uppermost mantle S‐wave velocity (Vs) model of CBV by applying advanced 3D full‐waveform adjoint tomography on seismic ambient noise data recorded in both China and North Korea. The newly obtained seismic images detail a 3D architecture of magma plumbing systems beneath CBV, characterized by the presence of a prominent lower‐crustal mush zone with an estimated melt fraction of ∼1.5%–3.6%, which is sourced from upwelling asthenosphere through a vertical narrow conduit in the uppermost mantle region that contains an estimated melt fraction of ∼6%.