摘要
云南墨江金矿和陕西煎茶岭金矿中Ａｇ、Ａｕ和ＰＧＥ（铂族元素）的丰度和共生状况如下：（１）两矿床中的Ａｇ－Ａｕ关系呈三种情况：硅质岩型矿石和其他类型低品位金矿石中Ａｇ－Ａｕ基本上不具相关关系；石英脉型矿石中Ａｇ－Ａｕ呈明显的正相关关系；氧化矿石中Ａｇ－Ａｕ呈负相关关系。（２）所有样品中的ＰＧＥ均低于７１×１０（－６），其ＰＧＥ的特征是Ｐｔ≥Ｐｄ和Ｒｕ＞Ｏｓ、Ｉｒ、Ｒｈ。（３）这些样品的地幔标准化ＰＧＥ分布模式是以Ｒｈ为峰的上凸曲线，而墨江样品又具Ｉｒ的负异常。与一般超基性岩的情况不同，这些样品的模式曲线中Ｐｄ－Ａｕ部分呈陡弯折，它表明矿化元素金可能主要由区域成矿流体提供。
The abundances and associations of Ag, Au and PGE in the two gold deposits related to carbonatized ultrabasic rock massives in Mojiang, Yunnan and Jianchaling, Shaanxi provinces are summarized as follows:1 . There are three kinds of correlations between Ag and Au in these deposits, i. e., Ag in the siliceous rock type of gold ore and other types of ores with lower gold grade has no correlation with Au; Ag in quartz vein type of gold ore has obviously positive correlation with Au;Ag and Au are negatively correlated in the oxidized ore.2. Total content of PGE in all samples is lower than 71×10(-9). They are featured by Pt≥Pd and Ru > Os, Ir and Rh.3. The mantle-normalized patterns of PGE of these samples from the two deposits are the convex curves with Rh peak, but those from the Mojiang deposit with negative ir anomaly. The suddenly rising of the patterns from Pd to Au exsits, which isn't found in the usual ultrabasic rocks, implying that the ore-forming element (Au) might mainly be provided by the regional metallogenetic fluid.
出处
《地球化学》
CSCD
北大核心
1996年第5期520-528,共9页
Geochimica
