The crust-mantle velocity structure beneath the Wudalianchi-Erkeshan-Keluo volcanic belt by joint inversion of receiver functions and ambient noise

IF 2.4 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Juntong Liu , Yinshuang Ai , Ying Chen , Jianshe Lei
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Abstract

The Wudalianchi-Erkeshan-Keluo (WEK) volcanic belt is a significant component of intraplate volcanism in Northeast China and is composed of the Wudalianchi, Erkeshan, and Keluo volcanic clusters. Using joint inversion of receiver functions and ambient noise, we construct a high-resolution 3-D S-wave velocity model of the WEK volcanic belt and its adjacent region, taking advantage of a deployed dense seismic array around this volcanic belt. There is a prominent low-velocity anomaly at 8–15 km depth beneath the Wudalianchi volcanic cluster, suggesting the presence of a crustal magma chamber. Low-velocity anomalies are also observed at 30–35 km depth beneath the Erkeshan volcanic cluster and 30–40 km depth beneath the Keluo volcanic cluster, resulting in discontinuous velocity structures at the Moho discontinuity. We further find a distinct low-velocity anomaly in the uppermost mantle beneath the WEK volcanic belt. Combined with previous geophysical and geochemistry studies, we propose a magma system scenario for the WEK volcanic belt. The upwelling molten material from the asthenosphere accumulated in the uppermost mantle and the magma chamber was formed, which provided the same uppermost mantle magma sources for the WEK volcanic belt.

Abstract Image

通过接收器函数和环境噪声联合反演研究五大连池-额尔齐斯山-开鲁火山带下的地壳-地幔速度结构
五大连池-额尔齐斯山-开鲁(WEK)火山带是中国东北板内火山活动的重要组成部分,由五大连池、额尔齐斯山和开鲁火山群组成。利用对接收函数和环境噪声的联合反演,我们构建了WEK火山带及其邻近地区的高分辨率三维S波速度模型。在五大连池火山群下方8-15千米深处有一个突出的低速异常,表明地壳岩浆腔的存在。在埃尔克山火山群下30-35千米处和凯洛火山群下30-40千米处也观测到了低速异常,从而在莫霍不连续处形成了不连续的速度结构。我们进一步发现,在WEK火山带下的最上层地幔中存在明显的低速异常。结合之前的地球物理和地球化学研究,我们提出了WEK火山带的岩浆系统方案。来自星体层的上涌熔融物质在最上层地幔积聚,形成岩浆腔,为WEK火山带提供了相同的最上层地幔岩浆源。
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来源期刊
Physics of the Earth and Planetary Interiors
Physics of the Earth and Planetary Interiors 地学天文-地球化学与地球物理
CiteScore
5.00
自引率
4.30%
发文量
78
审稿时长
18.5 weeks
期刊介绍: Launched in 1968 to fill the need for an international journal in the field of planetary physics, geodesy and geophysics, Physics of the Earth and Planetary Interiors has now grown to become important reading matter for all geophysicists. It is the only journal to be entirely devoted to the physical and chemical processes of planetary interiors. Original research papers, review articles, short communications and book reviews are all published on a regular basis; and from time to time special issues of the journal are devoted to the publication of the proceedings of symposia and congresses which the editors feel will be of particular interest to the reader.
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