![]() ![]() Chlorine and boron isotope compositions are consistent with fluids dominated by seawater (δ 37Cl = 0‰ δ 11B = 40‰) and sedimentary pore fluids (δ 37Cl ≈ −8‰ to 0‰ δ 11B > ∼17‰). ![]() Despite the change in concentrations along the margin, there is no corresponding trend in isotopic composition. Because Li, Cl, and B are all fluid-mobile elements, their incompatibility potentially limits modification by fluid-rock interaction, making them reliable tracers of fluid source. Most of these elements decrease overall in concentration from north to south, have a concentration peak in the central part of the margin, and have had limited concentration variability during the last three decades. Water samples were analyzed for their cation and anion concentrations, as well as their B, Li, Cl, and O stable isotope compositions. ![]() In order to trace the cycling of fluid-mobile elements (FMEs) through subduction zone forearcs, we collected water samples from two warm and 16 cold springs along the subaerially exposed forearc of the Hikurangi subduction zone in New Zealand. ![]()
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