Despite the importance of fluids in subduction zone processes, the extent of mass transfer and fluid circulation from the subducting plate through the forearc region remain unclear. To estimate the fluid budget and scale of fluid circulation in subducted sediments, we assess the distribution and retention of fluid-mobile elements (FME) in metamorphically equivalent metapelites from the Kodiak complex (Alaska) and the Shimanto Belt (Japan). The temperature range of interest is 230–350 °C, i.e., encompasses the base of the seismogenic zone. We examine the Li, B, Rb, Sr, Cs, and Ba concentrations in the bulk rock, as well as in fluid inclusions and individual minerals by (LA-) ICP-MS.

中文翻译：

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追踪俯冲带弧前流体流动的规模：流体流动因素的影响


尽管流体在俯冲带过程中很重要，但从俯冲板块通过弧前区域的质量传递和流体循环的程度仍不清楚。为了估计俯冲沉积物中的流体预算和流体循环规模，我们评估了科迪亚克杂岩（阿拉斯加）和四万十带（日本）的变质等效变泥岩中流体流动元素（FME）的分布和保留。感兴趣的温度范围是 230–350 °C，即涵盖地震发生带的底部。我们通过 (LA-) ICP-MS 检查大块岩石以及流体包裹体和单个矿物中的 Li、B、Rb、Sr、Cs 和 Ba 浓度。