(Table 3) Interstitial water elemental composition at DSDP Leg 86 Holes

Interstitial water samples from Leg 86 were analyzed for Cl-, SO42-, Ca2+, Mg2+, K+ , Li+ , Sr2+, Mn2+, Si, NO3-, NH4+ , and d18O. The principal findings are as follows. (1) The chloride profiles consistently show a about 1.5% downcore increase to about 40 m sub-bottom depth. This increase is consistent with model profiles generated by considering the effects of variations in seawater salinity resulting from Pleistocene glaciation on pore-water composition. d18O profiles support this model. This agreement of model and observation precludes advection of the pore fluids at rates greater than 1 mm/yr. (2) Ca2+ and Mg2+ gradients are small relative to other Deep Sea Drilling Project sites, likely resulting from low diffusive fluxes through underlying chert horizons. (3) Other constituents exhibit profiles consistent with previous observations.

对第86航次采集的孔隙水样品开展了Cl⁻、SO₄²⁻、Ca²⁺、Mg²⁺、K⁺、Li⁺、Sr²⁺、Mn²⁺、Si、NO₃⁻、NH₄⁺以及δ¹⁸O的分析。主要研究结果如下：(1) 氯离子浓度剖面整体呈现随海底以下深度向下至约40米处升高约1.5%的变化趋势。该变化与考虑更新世冰川作用引发的海水盐度变化对孔隙水组成影响所构建的模型剖面相符，δ¹⁸O剖面亦支持该模型。模型结果与观测数据的一致性，排除了孔隙流体以大于1毫米/年的速率发生平流的可能性。(2) 相较于其他深海钻探计划（Deep Sea Drilling Project）站位，Ca²⁺与Mg²⁺的浓度梯度较小，这一现象大概率源于穿过下伏燧石层的扩散通量较低。(3) 其余观测组分的浓度剖面特征与既往研究报道的结果一致。