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惠民凹陷渐新世玄武岩地球化学特征及大地构造意义

, PP. 303-315

Keywords: 玄武岩,地球化学,伸展减薄,沙河街组三段,惠民凹陷

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Abstract:

采用主量、微量元素和Sr-Nd同位素地球化学研究手段和大地构造分析方法,旨在阐明惠民凹陷渐新世玄武岩地球化学特征和揭示渤海湾盆地形成的地球动力学背景。研究认为:渐新世沙河街组三段玄武岩为碱性橄榄玄武岩;呈轻稀土富集型分布模式,无Eu异常,稀土总量较低(∑REE=109.4~146.8μg/g);大离子亲石元素富集,蛛网图显示负斜率较大的右倾曲线,并有不同程度的Nb-Ta和Sr元素富集、以及Ti和Y元素的轻度亏损,含量较低的不相容元素基本上呈平滑分布;Sr-Nd同位素组成较为均一,玄武岩岩浆主要来自亏损软流圈地幔,同时存在轻微的岩石圈地幔混染作用。综合分析区域地质和地球物理研究成果认为,包括惠民凹陷在内的渤海湾盆地是地幔上隆而造成岩石圈伸展减薄的产物,是太平洋板块向欧亚板块之下俯冲形成的陆内扩张盆地。

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