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Characteristics of Strontium Isotopic Geochemistry of Sublacustrine Hydrothermal Sedimentary Rock of Xiagou Formation in Qingxi Sag, Jiuquan Basin
Pages: 642-649
Year: Issue:  4
Journal: Acta Sedimentologica Sinica

Abstract: 以地质背景、物质组分和岩石组构分析为基础,对酒泉盆地青西凹陷下沟组湖相热水沉积钠长石-铁白云石岩进行了Sr同位素地球化学研究.结果表明,热水沉积岩87Sr/86Sr比值变化范围为0.712 25~0.717 81,平均值0.715 61,远高于同期海水和下沟组玄武岩,略高于代表早白垩世湖水锶同位素组成的藻灰岩,但低于基底壳源硅铝质岩,反映热流体不可能为单纯的湖水或幔源岩浆水;其中直接化学结晶沉淀的...
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