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Temperature fluctuation of the Iceland mantle plume through time

机译：冰岛地幔柱随时间的温度波动

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The newly developed Al-in-olivine geothermometer was used to find the olivine-Cr-spinel crystallization temperatures of a suite of picrites spanning the spatial and temporal extent of the North Atlantic Igneous Province (NAIP), which is widely considered to be the result of a deep-seated mantle plume. Our data confirm that start-up plumes are associated with a pulse of anomalously hot mantle over a large spatial area before becoming focused into a narrow upwelling. We find that the thermal anomaly on both sides of the province at Baffin Island/West Greenland and the British Isles at approximate to 61 Ma across an area approximate to 2000 km in diameter was uniform, with Al-in-olivine temperatures up to approximate to 300 degrees C above that of average mid-ocean ridge basalt (MORB) primitive magma. Furthermore, by combining our results with geochemical data and existing geophysical and bathymetric observations, we present compelling evidence for long-term (>10(7) year) fluctuations in the temperature of the Iceland mantle plume. We show that the plume temperature fell from its initial high value during the start-up phase to a minimum at about 35 Ma, and that the mantle temperature beneath Iceland is currently increasing.
机译：使用最新开发的Al-in-olivine地热仪来发现横跨北大西洋火成岩省（NAIP）时空范围的一系列微晶岩的橄榄石-Cr-尖晶石结晶温度。根地幔柱。我们的数据证实，启动羽状流与大空间区域上异常热的地幔脉冲有关，然后才被集中到狭窄的上升流中。我们发现，巴芬岛/西格陵兰岛和不列颠群岛两省的热异常在直径约2000 km的区域内约为61 Ma，是均匀的，橄榄石中铝的温度高达比平均中洋脊玄武岩（MORB）原始岩浆高300摄氏度。此外，通过将我们的结果与地球化学数据以及现有的地球物理和水深观测数据相结合，我们为冰岛地幔柱温度的长期（> 10（7）年）波动提供了令人信服的证据。我们表明，羽流温度从启动阶段的初始高值下降到约35 Ma的最小值，并且冰岛下方的地幔温度目前正在升高。

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