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首页> 外文期刊>Marine Geology >Authigenic P formation and reactive P burial in sediments of the Nazare canyon on the Iberian margin (NE Atlantic)
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Authigenic P formation and reactive P burial in sediments of the Nazare canyon on the Iberian margin (NE Atlantic)

机译：伊比利亚边缘（东北大西洋）纳萨尔峡谷沉积物中的自生磷形成和反应性磷埋藏

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摘要

Profiles of different forms of sedimentary phosphorus were measured at four sites at the Iberian margin (NE Atlantic), which were chosen on the basis of differences in depositional environment: a shelf site (113 m), a mid-slope station (1387 m) and two stations at the head (396 m) and base (3097 m) of the Nazare Canyon. The sediment was sequentially extracted for Fe-bound P, carbonate fluorapatite (CFA)+biogenic P+CaCO_3-bound P and detrital Ca-P, and non-sequentially for total P and inorganic P, where the difference between total and inorganic P was assumed to be organic P. Measurements of organic carbon and nitrogen, citrate-dithionite-bicarbonate- and citrate-ascorbate-bicarbonate-extractable Fe, carbon oxidation rates, Fe reduction rates, phosphate effluxes and sedimentation rates were used to quantify the cycling and burial of phosphorus at each site. CFA formation was observed only in sediments of the Nazare canyon, where enhanced rates of organic matter decomposition and Fe reduction provided the necessary conditions. The concentrations of reactive P were similar at all sites, but the sediment accumulation rates differed greatly. The high bulk accumulation rate at the base of the canyon results in a reactive P burial rate exceeding those estimated for continental margins including the Iberian margin by an order of magnitude. The estimated P burial efficiency is smallest at the slope station (3-24 percent), reasonably high (63-86 percent) at the shelf and head of the canyon stations and extremely high (>97 percent) at the base of the canyon. we propose that local depositories such as those at the base of canyons may be key sites for reactive P burial.
机译：在伊比利亚边缘（东北大西洋）的四个地点测量了不同形式的沉积磷剖面，这些地点是根据沉积环境的差异选择的：一个架子地点（113 m），一个中坡站（1387 m）在纳扎雷峡谷的顶部（396 m）和底部（3097 m）有两个站。依次提取沉积物的铁结合磷，碳酸盐氟磷灰石（CFA）+生物磷+ CaCO_3结合磷和碎屑Ca-P，无序提取总磷和无机磷，其中总磷与无机磷之差为假定为有机磷。通过测量有机碳和氮，柠檬酸盐-连二碳酸氢盐-碳酸氢盐和柠檬酸盐-抗坏血酸盐-碳酸氢盐可萃取的铁，碳氧化速率，铁还原速率，磷酸盐外排量和沉降速率来量化循环和埋葬。每个站点的磷含量。仅在纳萨尔峡谷的沉积物中观察到CFA的形成，那里的有机物分解速率加快和铁含量降低提供了必要条件。在所有地点，反应性P的浓度相似，但沉积物的沉积速率差异很大。峡谷底部的高堆积速率导致反应性P埋葬速率比大陆边缘（包括伊比利亚边缘）估计的P埋葬速率高一个数量级。估计的P埋葬效率在斜坡站最小（3％至24％），在峡谷站的架子和首部相当高（63-86％），在峡谷底部极高（> 97％）。我们建议，诸如峡谷底部的当地存放处可能是反应性P埋葬的关键地点。

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