(Table T3) Major element oxides and atomic formulas of Mg-rich and Fe-rich saponites from ODP Leg 168 sites@en

Sediment depth is given in mbsf. Formulas have been calculated on the basis of 20 oxygens and four hydroxyls per unit cell, considering (Si + Al)IV = 8 atoms per formula units and assigning the remaining Al to the octahedral sites together with Fe and Mg. The Mg excess in octahedral sites has been assigned to the interlayer positions.沉积物深度以海底以下米（meters below sea floor，mbsf）为单位给出。本次计算所采用的化学式以每个晶胞含20个氧原子与4个羟基为基准，同时规定每个化学式单位中四配位的硅（Si）与铝（Al）原子总数为8，并将剩余的铝与铁（Fe）、镁（Mg）一同分配至八面体位点。八面体位点中过量的镁被划归至层间位置。