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一、问题的提出和结果近年来,随着武岩岩理学研究的深入,已有不少学者应用地幔岩的不相容痕量元素来讨论玄武岩形成的地幔源性质、熔融过程、分离结晶历史及其大地构造环境.特别是那些高场强(离子电荷/离子半径)的惰性不相容元素(Zr、Hf、Ti、P、Nb、Ta等).在岩石成因研穷中已经显示了比常量元素更加突出优越性.这是因为地幔岩的惰性不相容元素含量、比值等特征是在分离结晶过程中不易变化为地球化学参数(Chen C—Y等.1983),它们可以反映岩浆来源的特征(例如富集的或亏损的)及其形成年用.而受表生风化及变质作用(对岩石成分特征)的影响不大(Winchester.J.A.等,1976).
I. PROBLEM PROPOSALS AND RESULTS In recent years, with the deepening of the research on the petrophysics of the Wuyan rocks, many scholars have used the incompatible trace elements of the mantle rocks to discuss the mantle source properties, the melting process, and the crystallization history And its tectonic setting, especially those of inert incompatible elements (Zr, Hf, Ti, P, Nb, Ta, etc.) with high field strength (ionic charge / ionic radius) This is because the characteristics of inert incompatible elements and ratios of mantle rocks are not easily changed into geochemical parameters during the separation and crystallization (Chen C-Y et al., 1983), and they can reflect the source of magma (Eg, enriched or depleted) and their annual formation, while epigenetic weathering and metamorphism (to the composition of rocks) have little effect (Winchester, JA et al., 1976).