祖辅平,舒良树,李成

• 1:南京大学地球科学与工程学院

摘要(Abstract)：

晚古生代永安盆地位于华夏块体武夷山隆起南缘,发育在前泥盆纪基底之上,是在政和—大埔断裂带基础上经伸展作用而成的一个沉积断陷盆地。盆内不同时代含碳层位样品δ13Corg值的变化及其与邻区样品δ13Corg值的对比研究显示了盆地本身乃至整个中国东南部沉积环境在不同地质时期以及同一时期不同区段沉积相变化的异同特征;永安盆地晚古生代沉积物有机碳δ13Corg值区间主要为(-15~-25‰),与同时期金衢盆地北缘沉积物有机碳δ13Corg值区间(-20~-30‰)较为相似,盆地有机碳TOC与同时期萍乐盆地TOC也有相似之处,这些特征表明,永安盆地成盆时期的沉积环境在区域范围内与其他盆地具有相同之处,即同为海陆过渡环境;同时,又有一定的区别,浙闽沿海地区含碳层位多为中新生代,而永安盆地则为晚古生代。在晚古生代永安盆地成盆期,浙闽沿海地区为一隆起区,该隆起区和武夷山隆起区共同构成了永安盆地的主要物源区,这一认识与区域古流向调查结果基本一致。

关键词(KeyWords)： 同位素;有机碳;沉积环境;晚古生代;永安盆地;福建

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(No.40634022,40972132);; 内生金属矿床成矿机制研究国家重点实验室项目(2008-I-01)资助

作者(Author): 祖辅平,舒良树,李成

DOI: 10.19839/j.cnki.dcxzz.2011.03.004

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