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首页> 外文期刊>Geochemical Journal >Pa-231 in hemipelagic sediments: Is it affected by boundary scavenging?
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Pa-231 in hemipelagic sediments: Is it affected by boundary scavenging?

机译：半海岸沉积物中的Pa-231：是否受到边界清除的影响？

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Sediment cores were obtained at six stations in the area across the northern Japan Trench including hemipelagic and oceanic basin zones, and analyzed for Pa-231 as well as Th-230. The concentration of Pa-231 in the surface sediments increased with both the distance from the coast and the increasing water depth in the slope and the trench zones except the oceanic basin. The vertical profiles varied widely from station to station, but they showed no distinct vertical trend at each station. Although the sedimentation rate of unsupported Pa-231 was more strongly controlled by the accumulation rate of bulk sediments than by its concentration, its sedimentation rates were about 200 times larger in the continental slope and the trench zones than in the oceanic basin. Furthermore, the ratios of Pa-231/Th-230 decreased offshore. The boundary scavenging, therefore, is more pronounced for the removal of Pa-231 from the water column. The activity ratios of Pa-231/Th-230 in the continental slope sediments were considerably greater than the production ratio in the water column of 0.092, and also remarkably larger in the western North Pacific than in the eastern North Pacific. The difference is probably due to biogenic opal, of which fraction is larger in the settling particles in the western North Pacific. [References: 21]
机译：在日本北部海沟区域（包括半流域和大洋盆地地区）的六个站点获得了沉积岩心，并对Pa-231和Th-230进行了分析。 Pa-231在表层沉积物中的浓度随着与海岸的距离增加以及除海洋盆地以外的斜坡和海沟区域中水深的增加而增加。各个站点的垂直剖面差异很大，但每个站点的垂直趋势均不明显。尽管不受支撑的Pa-231的沉积速率受散装沉积物积累速率的控制比受浓度影响更大，但其沉积速率在大陆坡和海沟区比海洋盆地大200倍左右。此外，Pa-231 / Th-230的比例在海上下降。因此，边界清除对于从水柱中除去Pa-231更为明显。 Pa-231 / Th-230在大陆斜坡沉积物中的活度比显着大于水柱中的产水率0.092，并且在北太平洋西部也明显大于北太平洋东部。造成这种差异的原因可能是生物蛋白石，在北太平洋西部的沉降颗粒中，蛋白石的比例更大。 [参考：21]

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