广西热水沉积矿床中硅质岩岩石学及岩石化学特征

Petrological and petrochemical characteristics of siliceous rocks in hydrothermal sedimentary deposit of Guangxi Province

研究区硅质岩主要呈层状、似层状及透镜状产出。岩石中矿物成分主要为玉髓及石英,具细粒—显微晶质或显微隐晶质结构及球粒结构,并具块状、条带状、纹层状构造。对硅质岩常量元素含量特征、Al/(Al+Fe+Mn)比值、Fe/Ti-Al(Al+Fe+Mn)关系图、Al-Fe-Mn三元图解特征及Fe-Mn-(Cu+Ni+Co)×10三角图解综合研究表明,广西热水沉积矿床中的硅质岩主要为热水沉积作用产物。

The siliceous rocks of the studying region, which occurred mainly in bed, like-bed forms and lens, have their main compositive mineral being calcedony and quartz which present in fine to microscopic crystalline texture or microscopic cryptocrystalline texture as well as spherulitic texture and have owned massive, banding and lamellar structure. It has concluded that the siliceous rocks in hydrothermal sedimentary deposit of Guangxi Province mainly result from the hydrothermal depositing effect after a comprehensive study of the content characteristics of major element in siliceous rocks, Al/（Al ＋Fe ＋Mn） value, the relationship diagram of Fe/Ti-Al（Al＋Fe＋Mn）, the features of three component diagram of Al -Fe-Mn as well as trigangular diagram of Fe-Mn- （Cu＋Ni＋Co）× 10.