东海沉积物间隙水中K,Na,Xa,Mg硅酸盐的热力学平衡

研究了东海沉积物间隙水中Ｋ，Ｎａ，Ｃａ，Ｍｇ硅酸盐的热力学平衡，结果表明，间隙水中的镁有明显转移，在较高的ｐＨ（〉８．５）下，可形成带Ｍｇ（ＯＨ）２夹层的无序海泡石（Ｗ）沉淀，从而有效地除去间隙水中的镁及溶解硅，海底到盐矿物钙长石，钾长石可风化为钙蒙脱石，高岭石等，钠长石仅表现为溶解，使间隙水中钠浓度增高。

THERMODYNAMIC EQUILIBRIA OF K.Na.Ca.Mg SILICATES IN SEDIMENT INTERSTITIAL WATERS OF THE EAST CHINA SEA

This paper mainly deals with the thermodynamic equilibria of K,Na. Ca Mg silicates in sediment interstitial waters of the East China Sea. The main results show as follows: Magnesium can be transfered into sediment from interstitial waters under the high pH values (pH>8.5) conditions. Authigenic magnesium silicate could be sepiolite (W) mixed with brucite (Mg(OH) 2) that can obviously remove dissolved magnesium and silicate. Bethic silicate minerals such as Ca feldspar (anorthite),K feldspar can weather into Ca montmorillonite and kaolinite. Na feldspar (albite) can be dissolved into interstitial waters that cause the sodium concentration to increase. The inverse relationship between phosphate with silicate in interstitial waters indicated that phosphate and silicate were controlled by early chemical diagenesis.