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氧同位素组成对于了解岩石成因、地幔不均一性和壳-幔相互作用等具有重要意义。国外对幔源物质的δ~(18)O作了大量测定,揭示了地幔δ~(18)O的不均一性,玄武岩的高、低δ~(18)O的地幔源区,以及扩δ~(18)O和Nd,Sr,Pb同位素组成的协变性等。国内研究报道甚少,与Sr,Nd,Pb同位素和REE等痕量元素地球化学研究相比较,存在明显差异。本文报道皖苏地区新生代大陆玄武岩、幔源橄榄岩包体、单斜辉石和歪长石巨晶捕虏体的δ~(18)O,并讨论其地球化学意义。
Oxygen isotopic compositions are of great importance for understanding the origin of rocks, the heterogeneity of the mantle and the crust-mantle interaction. A large number of δ 18 O observations from mantle sources have been made abroad, revealing the inhomogeneity of mantle δ 18 O, the mantle source areas of high and low δ 18 O basalt, and the δ ~ (18) O and Nd, Sr, Pb isotopic composition of the covariant and so on. There are few reports in China, which are obviously different from the trace element geochemical studies of Sr, Nd, Pb isotopes and REE. This paper reports the δ 18 O of the Cenozoic continental basalts, mantle-derived peridotite inclusions, clinopyroxene and albite feldspar in the Wan-Su area and their geochemical implications.