(Table 1) Interstitial water chemistry at DSDP Leg 81 Holes

Interstitial water studies on samples obtained during Leg 81 have revealed substantial changes with depth in dissolved calcium, magnesium, strontium, potassium, and lithium. Calcium and magnesium concentration changes result from alteration reactions, primarily in the basalts and also in the volcanic sediments overlying the basalts. Similarly, depletions in potassium are the result of reactions in volcanic sections of the drill holes. Lithium has its main source in the volcanic sediments. On the other hand, strontium-concentration maxima occur at the ooze-chalk boundary and are the result of carbonate recrystallization reactions. Distinct correlations between calcium gradients and extents of concentration maxima in strontium with sedimentation rates suggest (1) build up of calcium concentrations below diffusion communication depth and (2) increased rates of recrystallization of carbonate with rate of sedimentation. The latter process is probably related to the more "corrosive" character of the sediments as the result of organic carbon diagenesis.

针对第81航次（Leg 81）采集的样品开展的孔隙水（interstitial water）研究，揭示了溶解态钙、镁、锶、钾与锂的浓度随深度呈现出显著变化。钙、镁浓度的变化主要源自玄武岩及其上覆火山沉积物中的蚀变反应。同理，钾的损耗源于钻孔火山岩段内的反应过程。锂的主要赋存来源为火山沉积物。而锶浓度峰值则出现在软泥-白垩界面，由碳酸盐重结晶反应所导致。钙浓度梯度与锶浓度峰值幅度同沉积速率之间存在显著关联，据此可推断：（1）在扩散连通深度以下，钙浓度会发生累积；（2）碳酸盐重结晶速率随沉积速率的提升而加快。后一过程或与有机碳成岩作用赋予沉积物更强的"corrosive"特征相关。