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A fixed sublithospheric source for the late Neogene track of the Yellowstone hotspot: Implications of the Heise and Picabo volcanic fields

机译：黄石热点新近纪晚期轨道的固定岩下层气源：海斯和皮卡波火山场的含意

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The Heise and Picabo volcanic fields of eastern Idaho are part of the more extensive time-transgressive Yellowstone-Snake River Plain hotspot track. Calderas associated with these two silicic volcanic fields are buried under 1 to 3 km of younger basalt, so their locations and eruption record histories have been based on analysis of silicic units along the margins of the eastern Snake River Plain along with some limited geophysical data. A 1.5 km borehole penetrating through basalt into underlying silicic rocks provides new data we used to reassess caldera locations and the timing of eruptions of these volcanic fields. Using these new caldera locations, we calculate an extension-adjusted rate of 2.35 cm/yr for the North American plate over the last 6.66 m.y. and a velocity of 2.30 cm/yr over the 10.27 m.y. Recalculation of a previously determined plate velocity-based migration of the deformation field surrounding the eastern Snake River Plain yields an extension-adjusted rate of 2.38 ± 0.21 cm/yr. These migration rates all fall within the previously published range of North American plate velocities of 2.2 ± 0.8 cm/yr, 2.4 cm/yr, and 2.68 ± 0.78 cm/yr based on a global hot spot reference frame. The consistency of these rates suggest that over the last 10 m.y., the Yellowstone hot spot is fixed with respect to the motion of the North American plate and therefore consistent with a classical deep-sourced hotspot model.
机译：爱达荷州东部的海斯（Heise）和皮卡博（Picabo）火山场是更广泛的时移性黄石-蛇河平原热点路线的一部分。与这两个硅质火山场相关的破火山口被埋藏在新生玄武岩的1至3千米以下，因此它们的位置和喷发记录的历史都是基于对蛇河平原东部边缘硅质单元的分析以及一些有限的地球物理数据。一个1.5平方公里的钻孔穿过玄武岩穿透到下伏的硅质岩中，提供了我们用来重新评估破火山口位置和这些火山场喷发时间的新数据。使用这些新的破火山口位置，我们计算出北美板块在最近的6.66 m.y处的延伸调整速率为2.35 cm / yr。在10.27 m.y上的速度为2.30 cm / yr。重新计算先前基于板速度的蛇形河东部平原周围变形场的迁移，得出扩展调整后的速率为2.38 2.±0.21yrcm / yr。基于全球热点参考系，这些迁移速率均落在北美板块速度的先前公布范围内，分别为2.2±0.8 cm / yr，2.4 cm / yr和2.68±0.78 cm / yr。这些速率的一致性表明，在过去的10 y.y.，黄石热点相对于北美板块的运动是固定的，因此与经典的深源热点模型一致。

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