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首页> 外文期刊>Contributions to Mineralogy and Petrology >Water and other volatile systematics of olivine-hosted melt inclusions from the Yellowstone hotspot track
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Water and other volatile systematics of olivine-hosted melt inclusions from the Yellowstone hotspot track

机译：黄石热点轨道中橄榄石包裹的熔融包裹体的水和其他挥发性系统

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摘要

Major oxide, trace element and volatile (H_2O, CO_2, S, F, and Cl) compositions have been analyzed for olivine-hosted melt inclusions in eight basalt samples from Yellowstone National Park and the Snake River Plain (SRP) to identify the least differentiated melt compositions and assess the volatile budget of the Yellowstone hotspot. Melt-inclusion chemistry was evaluated to understand potential overprinting effects in the shallow mantle and crust of magmas derived from deeper levels. Maximum water concentrations of 3.3 wt% and CO_2 up to 1,677 ppm have been observed in olivine-hosted melt inclusions from the Gerritt Basalts at Mesa Falls, Idaho (SRP region), which is significantly higher than the maximum concentrations measured in lavas from other hotspots such as Hawaii (~0.8-0.9 wt%). Maximum water concentrations were generally observed in the least differentiated melt inclusions in terms of incompatible major oxide concentrations, indicating that high water concentrations are characteristic of the mantle or perhaps lower crust rather than resulting from differentiation enhancement within the shallow crust, even taking into account the fact that water behaves as an incompatible element during crystal frac-tionation. Enrichment in Ba coupled with depletion in Th in many of the melt inclusions and their host rocks is a characteristic of many arc lavas and may indicate that volatiles in Yellowstone-Snake River Plain basalts could have a subduction zone origin.
机译：分析了黄石国家公园和蛇河平原（SRP）的8个玄武岩样品中主要氧化物，痕量元素和挥发性成分（H_2O，CO_2，S，F和Cl）的橄榄石熔体夹杂物，以识别差异最小的矿物。融化成分并评估黄石热点地区的挥发性预算。对熔体包裹体化学进行了评估，以了解浅层地幔和深层岩浆壳中的潜在叠印作用。在爱达荷州梅萨福尔斯（SRP地区）的Gerritt玄武岩中，橄榄石包裹的熔岩夹杂物中观察到的最大水浓度为3.3 wt％，CO_2高达1677 ppm，这明显高于其他热点熔岩中测得的最大浓度。例如夏威夷（〜0.8-0.9 wt％）。通常在不相容的主要氧化物浓度方面，在差异最小的熔体夹杂物中观察到最大水浓度，这表明高水浓度是地幔或下部地壳的特征，而不是由浅地壳内部的分化增强所致，即使考虑到水在晶体破碎过程中表现为不相容元素这一事实。许多弧形熔岩的特征是许多熔体包裹体及其母岩中Ba的富集和Th的枯竭，这可能表明黄石-蛇河平原玄武岩中的挥发物可能具有俯冲带成因。

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