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https://ibb.co/RL0bLBX

論文出處：

https://doi.org/10.1016/j.epsl.2025.119467



儘管缺乏現今的地表火山活動，但此地函柱可以透過密集區域地震台網記錄的遠震P波和
S波到時殘差進行清晰成像。

410公里不連續面約14公里的下沉和660公里不連續面約20公里的向上偏轉進一步證實了
熱異常。成像的低速結構被正的當今殘餘地形所覆蓋，該區域自晚始新世（約40Ma）
以來神秘地抬升。

Mantle plumes are hot, buoyant upwellings that rise from Earth’s
core-mantle-boundary (CMB) at ~2890 km depth to the surface. As they ascend
towards the lithosphere – our planet’s rigid outermost shell –
decompression melting results in surface volcanism. In continental interiors,
a thicker lithosphere restricts plume ascent and associated decompression
melting. However, it remains uncertain whether limited continental volcanism
implies few sub-continental mantle plumes.

Here, we present inter-disciplinary evidence revealing the first clear
example of an amagmatic “ghost” plume in eastern Oman – the Dani plume.

Despite lacking present-day surface volcanism, this plume is robustly imaged
 using P- and S-wave arrival-time residuals from distant earthquakes,
recorded by a dense regional seismic network. A positive thermal anomaly is
further corroborated by a ~14 depression of the 410-km discontinuity and
a ~20 km upward deflection of the 660-km discontinuity.

The imaged low-velocity structure is overlain by positive present-day
 residual topography in a region enigmatically uplifted since the
late Eocene (~40 Ma).

超級地幔柱有三種規模，小如冰島大至德干暗色岩事件。

https://ibb.co/DfkgNhL6



目前還不確定阿曼的超級地幔柱會不會爆開就是。


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※ 作者: STAV72 2025-06-18 18:16:50
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