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地质论评  2005 

中国东南部中一新生代地球动力学背景若干问题的探讨

Keywords: 地幔性质,岩石圈减薄,地壳拉张,构造背景,中国东南部

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Abstract:

近年来,有关中国东南部中新生代地球动力学背景的研究已取得了重要的进展,主要体现在:地幔性质、岩石圈减薄、岩石圈伸展和构造背景四个方面。研究表明,中国东南部中新生代的地幔性质主体是亏损地幔和EMⅡ型富集地幔混合,中生代以富集地幔为主,而新生代主体为亏损地幔。中国东南部晚中生代经历了岩石圈减薄,并伴生了玄武质底侵作用,具有较为复杂的岩石圈增生~减薄过程。大量事实表明中国东南部中新生代存在多期岩石圈伸展事件,侏罗纪存在局部岩石圈伸展,主要集中于内陆地区,白垩纪经历了区域性岩石圈伸展。近二十年来,中国东南部大规模岩浆的构造背景一直存在着争论,焦点在于太平洋俯冲对中国东南部产生什么的影响。从目前已有的资料来看,白垩纪地幔源区受到太平洋俯冲的影响,太平洋俯冲和玄武质岩浆底侵诱发了地壳加厚,岩石圈拆沉和软流圈上涌而导致岩石圈伸展是中国东南部主要构造背景。但是,中国东南部晚中生代以来的岩石圈伸展一减薄及其深部动力学机制是目前急需进一步深入探讨的问题。

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