The geochemistry of iodine and bromine in sediments of the Panama Basin
The geochemistry of iodine and bromine in sediments of the Panama Basin
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发表时间：
2019
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通讯作者：
F. Pedersen;N. Price
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作者：
F. Pedersen;N. Price
碘，溴和有机碳的区域和垂直分布已在巴拿马盆地的一套沉积物芯进行了检查。这两种卤素与表层沉积物中有机碳的相关性较好。所有三种元素的浓度随深度而变化，特别是在赤道碳酸盐软泥中，观察到明显的中深度（40-80 cm）浓度最大值。碘化物是间隙水中的主要碘物种。详细的孔隙水剖面的两个核心显示碘的深度增加，在一个核心的中间深度卤素富集显然是一个主要的地点溶解碘生产。沉积物中Au的特征为1/C呈一级递减。,.与深度的比值。而Br/ C.剖面显示出相当大的变化，地下峰值的比例大致反映了沉积物溴的分布。这两种卤素的成岩行为的对比表明它们通过不同的有机配体成键。同时碳，碘和溴的生物赤道沉积物中的深度峰值在时间上与最大的威斯康星州冰川前进。简单的计算表明，一小部分的太平洋碘水库可能已被转移到富含碳的赤道太平洋沉积物在威斯康星州最大，这意味着气候波动可能间接有一个次要的重要性，在调节海洋碘平衡。
The areal and vertical distribution of iodine, bromine and organic carbon has been examined in a suite of sediment cores from the Panama Basin. Both halogens are approximately correlative with organic carbon in surface sediments. The concentrations of all three element s vary sympathetically but considerably with depth, especi ally in equatorial carbonate oozes where a distinct mid-depth (40-80 cm) concentration maximum is observed. Iodide is the dominant iodine species in interstitial water. Detailed pore water profiles of two cores display iodine increases at depth; in one of the cores the mid-depth halogen enrichment is clearly a major locus of dissolved iodine production. AU cores characteri stically show a first-order decrease in the sediment 1/C. ,. ratio with depth. In contrast, Br/ C. ,, profiles show considerable variation; subsurface peaks in the ratio roughly reflect the sediment Br distribution. The contrastive diagenetic behavior of the two halogens implies bonding by different organic ligands. The coincident carbon, iodine and bromine peaks at depth in biogenic equatorial sediments are temporally related to the maximum of the Wisconsin glacial advance. Simple calculations suggest that a minor proportion of the Pacific iodine reservoir could have been removed to carbon-rich equatorial Pacific sediments during the Wisconsin maximum, implying that climatic fluctuations may indirectly have a minor importance in regulating the oceanic iodine balance.