澳大利亚前寒武纪大陆地壳演化的Nd模式年龄制约--《地质调查与研究》1993年02期

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【摘要】:本文介绍了澳大利亚大陆元古和太古造山带Sm-Nd同位素体系广泛的调查结果。目的之一是为了查明原始地壳形成的主要时期,特别是为了辨别新地壳是在早元古时期新生的还是太古宙地壳的再造或重熔。地壳生长速率的评价不仅对确定大陆地壳生长和循环的总速率,同样对制约大陆壳综合演化模示均具重要意义。

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地壳演化 Nd模式年龄

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p sy%_@k-{01 Nd模式年龄 Nd模式年龄是由计算确定出的,样品具有与其源区相同同位素成分时的那个时间。模式年龄的计算包括了如下二个假设:即(1)大陆地慢源区库的Sm一Nd同位素组成及演化是已知的;(2)地壳样品的Sm一Nd同位素自从地慢源区库分离出来后保持近似的封闭,未受地壳内事件的改变

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