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Vanadium isotope compositions of mid-ocean ridge lavas and altered oceanic crust

机译:中海里奇兰花和改变海洋地壳的钒同位素组成

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摘要

Vanadium isotope compositions of igneous rocks have the potential to constrain variations of physicochemical conditions such as oxidation states during magmatism. Here, we present V isotope data for 27 fresh lavas (ranging from basaltic to dacitic compositions) from mid-ocean ridges, 31 altered basalts and gabbros from IODP site 1256 near the East Pacific Rise (EPR), and 2 back arc basin basalts (BABB). Our analyses of fresh mid-ocean ridge basalt (MORB) provide new constraints on the V isotope composition of MORBs, i.e. delta V-51 = -0.84 +/- 0.02 parts per thousand (2SE, n = 22). In addition, the mean delta V-51 of MORBs from individual segments is correlated with the mean ridge depth and Na-8.0 of the segment, which might reflect the effect of melting extent on V isotope fractionation during mantle melting.
机译:火岩的钒同位素组合物具有在岩浆中限制诸如氧化状态的物理化学条件的变化。 在这里,我们向中海山脊的27个新鲜熔岩(从玄武岩组合物的范围)呈现V同位素数据,从东太平洋上升(EPR)附近的IODP网站1256和2后弧盆地玄武岩( BABB)。 我们对新海洋脊玄武岩(Morb)的分析为Morbs的V同位素组成提供了新的约束,即ΔV-51 = -0.84 +/- 0.02份(2se,n = 22)。 另外,来自各个段的性器的平均delta V-51与分段的平均脊深度和Na-8.0相关,这可能反映熔化程度在裂缝熔化过程中V同位素分馏的影响。

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