摘要
陕西柞水银洞子银铅矿含矿层中发育一种似碧玉岩(硅质岩)。岩石同生沉积且速率较快,含钠长石晶屑、重晶石和镁电气石,未见生物作用痕迹。组成元素的分布、变化或关系与现代或古代海底热液沉积物/(岩)一致或相似。稀土配分式样相似于热液沉积硅质岩及现代海水。氧同位素组成与国外热液沉积的硅质岩相近,石英形成温度(80.8℃)高于正常海水温度。地质、岩石学及地球化学提供了较系统的信息证明似碧玉岩的海底热液沉积成因特征。
In Yindongzi Ag-Pb ore deposit in Zhashui, there is a kind of jasperoid rock. The rock deposited syngeneticaly with high accumulative rate. It contains debris of albite crystalls, barite and tourmaline, without any traces of biologic process. The changes, distributions or relations the contained elements are the same as or similer to that of recent or old seafloor hydrothermal sediments. The REE patterns bear a resemblance to that of hydrothermal sedimentary Silicious rock and seawater. Its oxygen isotope is close to that of hydrothermal sedimentary silicious rock reported abroad and the forming temperature (80.8℃) of quartz is higher than that of seawater. Geologic, petrologic and geochemic evidences provide more systematic informations to illustrate the seafloor hydrothermal sedimentary nature of the jasperoid rock.
出处
《矿物岩石》
CAS
CSCD
1991年第2期31-40,共10页
Mineralogy and Petrology
基金
中国科学院矿床地球化学开放研究实验室科学基金
关键词
似碧玉岩
热液沉积
银洞子
jasperoid rock, hydrothermal sediment, Yindongzi, Qinling Mountain
