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本文研究中太平洋约翰斯顿岛卡林海山铁锰结壳ＲＤ４—２和东太平洋海盆铁锰结壳５４０５的锶同位素组成特征，并利用铁锰结壳的锶同位素组成与大洋海水锶同位素演化标准曲线对比，推断出结壳生长起始年龄，按三元混合模式，计算玄武质组分和硅铝质组分对锶同位素的贡献。
In this paper, we study the strontium isotopic composition of the Carlin seamounts RD4-2 in the Johnston Island of the Pacific Ocean and the ferromanganese crusts 5405 in the East Pacific Ocean. Using the strontium isotopic compositions of ferromanganese crusts and the strontium isotope evolution of oceanic seawater By contrasting the curves, the initial age of crust growth is deduced. According to the ternary mixing model, the contribution of basaltic component and silicon-aluminum component to strontium isotopes is calculated.