Abstract:The silicon isotopic composition (δ 30 Si) of deep sea sponges' skeletal element -spicules -reflects the silicic acid (DSi) concentration of their surrounding water and can be used as natural archives of bottom water nutrients. In order to reconstruct the past silica cycle robustly, it is essential to better constrain the mechanisms of biosilicification, which are not yet well understood. Here, we show that the apparent isotopic fractionation (δ 30 Si) during spicule formation in deep sea sponges from the equa… Show more
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