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地球学报  2010 

皖北新元古代贾园组混积岩物源和构造背景的地球化学示踪

DOI: 10.3975/cagsb.2010.06.07

Keywords: 物源,构造背景,混积岩,地球化学,新元古代,皖北

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Abstract:

在野外调查和岩石学研究的基础上,对皖北新元古代贾园组混积岩进行了系统的元素地球化学(包括稀土元素)分析,结果表明:该套混积岩主要由不同比例(1:1.5~1:9)的碳酸盐和陆源碎屑组分混合而成,属于“相缘渐变沉积混合”。其元素含量与碳酸盐组分和陆源碎屑组分比例密切相关,但La、Th、Zr及Sc等元素之间的比值主要受控于陆源碎屑而相对稳定,可以用于识别碎屑物源区及其构造背景。地球化学特征证实混积岩中陆源碎屑组分主要来自与大陆岛弧有关的长英质火山岩,但也存在少量古老基底的参与。结合最近研究进展推断,皖北新元古代沉积活动可能主要发生在与1.0~0.8Ga之间,其沉积环境与Rodinia超大陆汇聚过程中导致的华北板块东南缘弧后伸展有关。

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