藏北地区砂金指纹特征及其对原生金的指示意义  

FINGERPRINT FEATURES OF PLACER GOLD AND ITS INDICATING SIGNIFICANCE FOR PRIMARY GOLD IN THE NORTHERN TIBET

作　　者：卫万顺[1] 路彦明[2] 刘贵阁[2] 张宇辉[2] 

机构地区：[1]北京大学地球与空间科学学院 [2]武警黄金地质研究所,廊坊065000

出　　处：《地质与勘探》2004年第6期42-46,共5页Geology and Exploration

基　　金：国土资源大调查项目"西藏班公湖-怒江成矿带中段金矿资源评价"(编号:199910200245)资助。

摘　　要：砂金指纹(化学成分)特征是利用砂金寻找原生金的重要手段之一。研究表明,藏北地区砂金成色具明显的不均匀性,化学成分在东、西部地区变化较大,反映区内砂金对原生金具有继承性,并受后期地质作用改造明显,表明其原生金来源可能具有近距离搬运的多来源特征;自然金微量元素含量特征则指示:本区原生金的类型主要为浅成低温热液型,矿石富含As、Sb、Cu、Pb、Zn,且剥蚀程度较小,在砂金富集区附近有望找到规模较大的原生金矿床。The fingerprint features (chemical composition) of placer gold has been a important method to seek primary gold. It is shown that the fineness of placer gold in the northern Tibet is obviously uneven and the chemical composition is varied in the east and west parts. Placer gold has inherited from primary gold in the source area, and been clearly remoulded by the later geological events. It is concluded that the primary gold might have multi-source features with short-distance carrying. The features of the native gold microelements indicate that the majority of native gold types are the epithermal ones. Ores are rich in As, Sb, Cu, Pb and Zn, showing being less denuded. It has good prospect to find a large-scale primary gold deposit near the placer gold enriched area.

关 键 词：砂金 指示意义 藏北地区 浅成低温热液 金矿床 地质作用 剥蚀程度 指纹特征 化学成分 后期 

分 类 号：P618.51[天文地球—矿床学] R821.12[天文地球—地质学]