摘要: Abstract The low-temperature synthesis of clay minerals is possible through the aging freshly prepared hydroxide—silica precipitates. rapid nontronite only at surface temperatures under reducing conditions. Under oxidizing conditions, pure Fe(III)- or Al-smectite could not be synthesized low temperatures. It from Fe(II)-containing solutions that and lembergite, di-[Fe(III)] tri-[Fe(II)] octahedral three-layer silicates, are built up in several days presence Fe(II) enables an layer brucite—gibbsite type to formed. These necessary for bidimensional orientation SiO 4 tetrahedrons, leading clay-mineral formation. Fe 2+ and/or Mg ions formation Al 3+ - -containing silicate minerals. diagenetic contents recent sediments sufficient build Al-rich both fresh-water salt-water
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