An extensive data set of biogenic silica (BSi) fluxes is presented for the Peruvian oxygen minimum zone (OMZ) at 11°S and 12°S. Each transect extends from the shelf to the upper slope (∼1,000 m) and dissects the permanently anoxic waters between ∼200 and 500 m water depth. BSi burial (2,100 mmol m⁻² yr⁻¹) and recycling fluxes (3,300 mmol m⁻² yr⁻¹) were highest on the shelf with mean preservation efficiencies (34% ± 15%) that exceed the global mean of 10%–20%. BSi preservation was highest on the inner shelf (up to 56%), decreasing to 7% and 12% under anoxic waters and below the OMZ, respectively. The data suggest that the main control on BSi preservation is the rate at which reactive BSi is transported away from undersaturated surface sediments by burial and bioturbation to the underlying saturated sediment layers where BSi dissolution is thermodynamically and/or kinetically inhibited. BSi burial across the entire Peruvian margin between 3°S to 15°S and down to 1,000 m water depth is estimated to be 0.1–0.2 Tmol yr⁻¹; equivalent to 2%–7% of total burial on continental margins. Existing global data permit a simple relationship between BSi rain rate to the seafloor and the accumulation of unaltered BSi, giving the possibility to reconstruct rain rates and primary production from the sediment archive in addition to benthic Si turnover in global models.

中文翻译：

---

开放边界氧气最小区域中生物硅的回收和埋葬

给出了在11°S和12°S下秘鲁最小氧气区（OMZ）的大量生物硅（BSi）通量数据集。每个横断面从架子延伸到上坡（〜1,000 m），并解剖水深在〜200至500 m之间的永久缺氧水。BSi埋葬（2,100 mmol m ^-2  yr ^-1）和循环流量（3,300 mmol m ^-2  yr ^-1））在货架上最高，其平均保存效率（34％±15％）超过了全球平均水平的10％-20％。BSi的保存在内层架上最高（达56％），在缺氧水域和OMZ以下分别降低至7％和12％。数据表明，对BSi保存的主要控制是通过埋藏和生物扰动将反应性BSi从欠饱和表层沉积物运移到下面的饱和沉积物层的速率，其中BSi的溶解在热力学和/或动力学上受到抑制。在3°S至15°S至水深1000 m的整个秘鲁边界埋藏的BSi估计为0.1–0.2 Tmol yr ^-1; 相当于大陆边缘埋葬总数的2％–7％。现有的全球数据允许BSi到海底的降雨率与未改变的BSi的积累之间的简单关系，除了全球模型中底栖硅的周转量外，还可以从沉积物档案中重建降雨率和初级生产。