摘要
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 p H(>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 ,海底硅酸盐矿物钙长石、钾长石可风化为钙蒙脱石、高岭石等 ,钠长石仅表现为溶解 。
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.
出处
《海洋科学》
CAS
CSCD
北大核心
1997年第1期48-52,共5页
Marine Sciences
关键词
硅酸盐体系
热力学平衡
东海
沉积物
间隙水
Silicate system, Thermodynamic equilibrium, Sediment interstitial water of the East China Sea
