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地质通报  2010 

鄂尔多斯盆地上三叠统延长组凝灰岩夹层Th元素的富集特征

, PP. 1185-1191

Keywords: 鄂尔多斯盆地,上三叠统延长组,沉积环境,凝灰岩夹层,烃源岩,Th元素

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Abstract:

鄂尔多斯盆地上三叠统延长组凝灰岩夹层分布广泛,能谱测井资料解释凝灰岩夹层Th元素含量为25×10-6~35×10-6,元素地球化学测试结果Th含量在15×10-6~80×10-6之间,平均36.6×10-6,明显高于与其互层的泥岩或炭质泥岩的平均值,也高于地球各圈层的平均值,属于Th富集状态。延长组凝灰岩夹层中Th的富集可能主要有2个方面的原因,其一是原始岩浆中Th含量较高,因其性质相对不活泼,未发生明显的迁移;其二是凝灰岩经历了较强烈的水解蚀变作用,蚀变产物以粘土矿物为主,从而可能吸附了上下地层中的Th,最终导致了凝灰岩夹层中Th的富集。Th的富集可以作为研究区识别凝灰岩夹层的标志,有利于进行更精细的地层对比。同时,Th/U比值反映出的延长期凝灰岩沉积作用所引起的元素迁移和古环境变化,可能对延长组优质烃源岩的发育有重要作用。

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