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NH4+和K+具有相同的离子半径(K+半径为0.133nm,NH4+半径为0.148nm),导致NH4+可以替代K+参与成岩作用形成含铵硅酸盐矿物,常见的含铵矿物有:水铵长石,含铵黑云母、铵伊利石等(Higashi S,1982;Juster T C,1987)。铵伊利石常见于有机质丰富的沉积地层
NH4 + and K + have the same ion radius (K + radius of 0.133nm, NH4 + radius of 0.148nm), resulting in NH4 + can replace K + to participate in diagenesis to form ammoniated silicate minerals. The common ammonium-containing minerals are: Ammonium-containing biotite, ammonium illite etc. (Higashi S, 1982; Juster TC, 1987). Ammonium ammonium illite is common in organic-rich sedimentary formations