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江西会昌盆地晚白垩世站塘高钠埃达克质岩石的地球化学特征及岩石成因

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Keywords: 高钠安山岩,埃达克岩,富碱玄武岩熔融,底侵作用,江西

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Abstract:

江西会昌盆地晚白垩世喷发的站塘安山岩,其形成与晚中生代岩石圈伸展和玄武质岩浆的底侵作用有关。这些岩石是高Na(6.59%~8.46%Na2O)、高Al的奥长花岗质岩石,具有与埃达克岩相似的高Sr和Ba、低Y和HREE、高Sr/Y和La/Yb比等特点。与埃达克岩相比,它们的Na2O较高而CaO较低,其εNd(t)值-2.3~-3.8和87Sr/86Sr初始比值0.707~0.708也与具大洋同位素组成特征的埃达克岩有明显区别。这些化学的和同位素特征,表明它们并非消减板片部分熔融的产物。站塘埃达克质岩浆可能源自底侵玄武质下地壳,其异常的高Na和低Ca特点反映其源岩成分的特殊性。因其成分与由实验产生的富碱玄武岩部分熔融体组成相当,因此,我们认为站塘高钠安山质岩浆可能是富碱玄武质岩石部分熔融的产物。

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