地壳中主要氧化物的含量(%)元素Na2OMgOAl2O3SiO2P2O5K2OCaOTi2OMnOFeO大陆上地壳3.90%2.20%15.20%66.00%0.15%3.40%4.20%0.65%0.08%4.50%大陆中地壳3.20%3.40%15.50%52.30%0.10%2.01%5.10%0.70%0.10%6.40%大陆下地壳2.60%7.10%16.60%59.10%0.10%0.60%9.40%0.80%0.10%8.14%大陆地壳整体3.20%4.40%15.80%49.50%0.20%1.88%6.40%0.70%0.14%6.60%大洋地壳2.80%7.70%16.00%0.14%11.30%1.50%0.13%10.50%规律总结:1.奇偶规律:原子序数为偶数的元素其丰度大大高于相邻原子序数为奇数的丰度。2..地壳贫铁镁,富铝钾钠。3.递减规律:原子序数较低的的范围内,元素丰度随原子序数增大呈指数递减。4.较轻易熔的铝硅酸盐在地壳表层富集,较重的镁铁向深部集中。地壳15种稀有元素丰度表(10-6)元素YLaCePrNdSmEuGdTbDyHoErTmYbLu上地壳2230647.1264.50.883.80.643.50.82.30.332.20.3中地壳2217155.8244.41.540.583.80.82.32.30.4下地壳168202.6112.81.13.10.483.10.71.90.321.50.3规律总结:1原子系数为偶数的元素丰度大于相邻原子系数为奇数的元素,具有偶数质子数或中子数的核数丰度总是高于奇数质子数或中子数的核数。2在稀有元素中,SmEuGdTbDyHoErTmYbLu随着深度的增加丰度几乎不变,Ce的含量最高,Tm,Lu的含量最低,LaCePrNd的丰度随着深度的增加逐渐减少。3稀土元素的分布是不均匀的,原子序数为偶数的元素一般比相邻的原子序数为奇数的元素含量高。4大陆地壳稀土元素总量高,相对富轻稀土;大洋地壳稀土元素含量较低,相对富重稀土。