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首页> 外文期刊>Geochemistry, geophysics, geosystems >Contrasting sediment melt and fluid signatures for magma components in the Aeolian Arc: Implications for numerical modeling of subduction systems
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Contrasting sediment melt and fluid signatures for magma components in the Aeolian Arc: Implications for numerical modeling of subduction systems

机译：风沙弧中岩浆成分的沉积物融解和流体特征对比：对俯冲系统数值模拟的启示

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摘要

The complex geodynamic evolution of Aeolian Arc in the southern Tyrrhenian Sea resulted in melts with some of the most pronounced along the arc geochemical variation in incompatible trace elements and radiogenic isotopes worldwide, likely reflecting variations in arc magma source components. Here we elucidate the effects of subducted components on magma sources along different sections of the Aeolian Arc by evaluating systematics of elements depleted in the upper mantle but enriched in the subducting slab, focusing on a new set of B, Be, As, and Li measurements. Based on our new results, we suggest that both hydrous fluids and silicate melts were involved in element transport from the subducting slab to the mantle wedge. Hydrous fluids strongly influence the chemical composition of lavas in the central arc (Salina) while a melt component from subducted sediments probably plays a key role in metasomatic reactions in the mantle wedge below the peripheral islands (Stromboli). We also noted similarities in subducting components between the Aeolian Archipelago, the Phlegrean Fields, and other volcanic arcs/arc segments around the world (e.g., Sunda, Cascades, Mexican Volcanic Belt). We suggest that the presence of melt components in all these locations resulted from an increase in the mantle wedge temperature by inflow of hot asthenospheric material from tears/windows in the slab or from around the edges of the sinking slab.
机译：在第勒尼安海南部，风弧的复杂地球动力学演化导致了全球范围内不相容的痕量元素和放射性同位素中沿弧地球化学变化最明显的熔体，可能反映了弧岩浆源成分的变化。在这里，我们通过评估上地幔中耗尽但富含俯冲板片的元素的系统，阐明了俯冲分量对沿风成弧不同断面的岩浆源的影响，重点研究了一组新的B，Be，As和Li测量值。根据我们的新结果，我们认为含水流体和硅酸盐熔体都参与了从俯冲板到地幔楔的元素运移。含水流体强烈影响中心弧（萨利纳）熔岩的化学成分，而俯冲沉积物的熔体成分可能在外围岛下方的地幔楔的交代反应中起关键作用（斯特龙博利）。我们还注意到，风成群岛，Phlegrean油田和世界其他火山弧/弧段（例如，Sunda，Cascades，墨西哥火山带）的俯冲分量相似。我们建议在所有这些位置都存在熔体成分，这是由于热的软流层材料从板中的裂缝/窗口或从下沉板的边缘流入而导致地幔楔温度升高所致。

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