贵州水银洞金矿床砂岩成分与构造背景探讨

研究表明,砂岩成分受物源区岩性特征、搬运方式及沉积环境的综合影响,而母岩区和沉积盆地的关系,受板块构造的控制,即砂岩成分与其形成时所处的板块构造环境有关。因此,砂岩的成分可作为构造环境分析的标志。选取水银洞砂岩样品,进行主量元素地球化学分析,并利用分析结果对其物源区沉积大地构造背景进行判别。结果表明,水银洞矿区砂岩物源主要来自大洋岛弧,少量来自大陆边缘,显示研究区当时处于邻近大洋岛弧的周缘前陆盆地环境。

Discussion on tectonic setting and sandstone composition of Shuiyindong gold deposit, Guizhou province

Studies have shown that sandstone composition is influenced by the material source area lithology,handling methods and the depositional environment. While the relationship between the parent rock area and the sedimentary basin is controlled by the plate tectonics,that is the sandstone composition related to the plate tectonic environment during its formation period. Therefore,the sandstone composition can be used as a sign of structural environment analysis. Sandstone samples are collected from Shuiyindong gold deposit to carry out major element geochemical analysis for tectonic setting discrimination of material source areas. The result indicates that most of sandstone material source is from the oceanic island arc and a few from the continental edge,and the studying area is a basin around the oceanic island arc.