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首页> 外文期刊>Contributions to Mineralogy and Petrology >An experimental study of a minette from the Milk River area, southern Alberta, Canada
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An experimental study of a minette from the Milk River area, southern Alberta, Canada

机译：来自加拿大艾伯塔省南部米尔克河地区的薄饼的实验研究

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Buhlmann et al. (Can J Earth Sci 37: 1629-1650, 2000) studied the minettes and xenoliths from the Milk River area of southern Alberta, Canada. Based on previous work, they hypothesized that the minettes were derived from a source containing phlogopite + clinopyroxene ± olivine, at pressures ≥ 1.7 GPa. To test this hypothesis, liquidus experiments were performed on a primitive minette between 1.33 and 2.21 GPa and between 1,300 and 1,400 °C to constrain the mineralogy of its source region. We found a multiple saturation point along the liquidus at 1.77 GPa and 1,350 °C, where the liquid coexists with orthopyroxene and olivine. Neither phlogopite nor clinopyroxene were found to be liquidus phases, which is inconsistent with Buhlmann et al.'s hypothesis. We suggest that our minette is not primary, but had re-equilibrated with harzburgitic mantle subsequent to formation. In such a scenario, partial melting of a veined source containing mica and clinopyroxene occurred at or near the base of the Wyoming craton (~ 200 km). Minimal heating or the introduction of hydrous fluids into the source would be required to induce partial melting. Rapid ascent rates, coupled with slow cooling rates, of the "primary minette magma" would preserve the high temperature observed in our experiments. At ~58 km, our "primary minette magma" likely stalled and re-equilibrated with the harzburgite surroundings.
机译：Buhlmann等。 （Can J Earth Sci 37：1629-1650，2000）研究了来自加拿大艾伯塔省南部米尔克河地区的细小薄片和异岩。根据先前的工作，他们假设这些薄片是在压力≥1.7 GPa的情况下衍生自含有金云母+ Clinopyroxene±橄榄石的材料。为了验证这一假设，在1.33至2.21 GPa和1,300至1,400°C之间的原始细碎板上进行了液相线实验，以限制其源区的矿物学。我们在1.77 GPa和1,350°C的液相线处发现了多个饱和点，其中液相与邻苯二酚和橄榄石共存。既没有金云母也没有clinopyroxene是液相，这与Buhlmann等人的假设相矛盾。我们建议，切碎板不是主要的，但在形成后已与哈茨堡地幔重新平衡。在这种情况下，怀俄明克拉通底部（或约200 km）或其附近发生了含有云母和斜柏的脉状源的部分熔化。为了引起部分熔化，将需要最小限度的加热或将含水流体引入到源中。快速的上升速率，再加上缓慢的冷却速率，使“原始碎浆岩浆”保持了我们实验中观察到的高温。在约58公里处，我们的“主要碎浆岩浆”可能停滞了，并与Harzburgite环境重新平衡。

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