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华南陆弧深部地幔多样性与俯冲动力学新发现
研究发现,华南中生代陆弧的碱性玄武岩形成于121Ma,具有典型的大洋岛弧玄武岩地球化学特征。这些岩石的高Nd同位素值(3.5-3.7)、低Sr同位素值(0.7034-0.7040)和低La/Nb比值(0.5-1.0)表明它们主要起源于软流圈地幔。与华 ...
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