(Table 1) Interstitial water chemistry at DSDP Leg 63 Holes

Interstitial water studies of drill sites off the California Continental Borderland (Sites 467, 468, 469) reveal that fresh water can penetrate through the sediments as far as the San Miguel Gap (Site 467). In the rapidly deposited sediments of Site 467, decreases in magnesium concentrations can be related to the formation of dolomite in the claystone unit of the sediment column. Decreases in magnesium and increases in calcium at Site 469 at the base of the Patton Escarpment are probably the result of alteration of volcanic matter in the sediments and/or the underlying basalts. […]

对加利福尼亚大陆边缘带近海的467、468、469号钻探站位开展的孔隙水研究表明，淡水可穿透沉积物直至圣米格尔水道（467号站位）。在467号站位快速沉积的沉积物中，镁浓度的降低可与沉积物柱体黏土层段内白云岩的形成相关联。位于帕顿陡崖底部的469号站位处，镁浓度下降与钙浓度上升的现象，大概率是沉积物及/或下伏玄武岩内火山物质发生蚀变的结果。[…]