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Buoyant hydrous mantle plume from the mantle transition zone

机译：来自地幔过渡带的漂浮性含水幔幔

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摘要

Magmatism at some intraplate volcanoes and large igneous provinces (LIPs) in continental areas may originate from hydrous mantle upwelling (i.e. a plume) from the mantle transition zone (MTZ) at 410–660 km depths in the Earth’s deep interior. However, the ultimate origin of the magmatism, i.e. why mantle plumes could have been generated at the MTZ, remains unclear. Here, we study the buoyancy of a plume by investigating basalts from the Changbaishan volcano, beneath which a mantle plume from the hydrous MTZ is observed via seismology. Based on carefully determined water contents of the basalts, the potential temperature of the source mantle is estimated to be 1310–1400 °C, which is within the range of the normal upper mantle temperature. This observation suggests that the mantle plume did not have a significant excess heat, and that the plume upwelled because of buoyancy resulting from water supplied from the Pacific slab in the MTZ. Such a hydrous mantle plume can account for the formation of extremely hydrous LIP magmatism. The water was originally sourced from a stagnant slab and stored in the MTZ, and then upwelled irrespective of the presence or absence of a deep thermal plume.
机译：大陆地区某些板内火山和大火成岩省（LIP）的岩浆作用可能来自地幔过渡区（MTZ）在地球深部内部410-660 km深度处的含水地幔上升流（即羽状流）。但是，尚不清楚岩浆作用的最终成因，即为何可能在MTZ产生地幔柱。在这里，我们通过研究长白山火山的玄武岩来研究羽流的浮力，然后通过地震学观察到来自含水MTZ的地幔羽。根据仔细确定的玄武岩含水量，地幔的潜在温度估计为1310–1400 C，处于正常的上地幔温度范围内。该观察结果表明，地幔柱没有明显的多余热量，并且由于MTZ太平洋板块供应的水产生了浮力，因此柱流上升了。这种含水的地幔柱可以解释极端含水的LIP岩浆作用的形成。水最初来自停滞的平板，并存储在MTZ中，然后无论是否存在深层热羽流都向上涌水。

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