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地质通报  2003 

滇西南耿马地区弄巴剖面早石炭世硅质岩的地球化学特征及古地理意义

, PP. 335-340

Keywords: 滇西南弄巴剖面硅质岩玄武岩地球化学

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Abstract:

滇西南耿马地区弄巴剖面由不同时代、不同岩性的地层断片组成,其中早石炭世2个断片由玄武岩和灰白色、紫红色放射虫硅质岩、硅质泥岩、凝灰岩组成。对硅质岩进行地球化学研究后发现,该地区硅质岩SiO2含量均在80%以上,MnO/TiO2的平均值为0.58,Al/(AlFeMn)的平均值约为0.48,Ce/Ce*的平均值为0.91,与已知大地构造背景的硅质岩地球化学特征对比,表明其为近大陆边缘的洋盆边缘型硅质岩。

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