西秦岭南亚带太阳顶群硅质岩的沉积地球化学及成因研究  

SEDIMENTARY GEOCHEMISTRY AND GENESIS OF TAIYANGDING GROUP CHERTS FROM SOUTHERN SUBZONE OF WESTERN QINLING AREA

作　　者：董维全[1] 陈先沛[1] 高计元[1] 

机构地区：[1]中国科学院广州地质新技术研究所

出　　处：《地球化学》1994年第C00期145-153,共9页Geochimica

摘　　要：西秦岭南亚带太阳顶群硅质岩是碳硅泥岩型微细粒浸染状金矿的主要赋存岩石。硅质岩总厚度５５５ｍ，呈层状、透镜状产出。太阳顶群除硅质岩外，其余主要为细碎屑岩。硅质岩的主元素特征为富Ｓｉ、Ｆｅ，贫Ａｌ、Ｔｉ、Ｃａ、Ｍｇ等；微量元素贫Ｃｕ、Ｎｉ、Ｃｏ，富Ｕ；稀土元素表现出较明显的铈负异常。硅质岩的全岩氧同位素δ１８ＯＳＭＯＷ（‰）值为１８．６０±１，表明太阳顶群硅质岩具有热水沉积的地球化学特征。The Taiyangding Group cherts are the main host rock of the calcareous-siliceousargillaceous type gold deposits in the southern subzone of western Qinling area.The cherts occur in beds and lens,and have a thichness of 555 m.Besides cherts,the Taiyangding Group also contains some microclastic rocks.The cherts are characterized by rich Si and Fe and poor Al,Ti,Ca,Mg and the like.High U and low Cu,Ni and Co contents and strongly negative Ce anomaly are also characteristic.The average δ18OSMOW values of quartz from bulk-rock samples is 18.60‰.The Taiyangding Group cherts are similar in geochemistry to sedimendary rocks of hydrothermal origin.

关 键 词：太阳顶群 硅质岩 沉积地球化学 成因分析 西秦岭南亚带 赋存岩石 微细粒浸染状金矿 

分 类 号：P618.51[天文地球—矿床学] P611.22[天文地球—地质学]