摘要
近十余年来，在华北地台太古宙花岗岩－绿岩带金矿的研究中，获取了许多有关地层、岩石金丰度值的资料。早期获取的资料因化验分析方法灵敏度不高且样品中常常包含矿化、蚀变和构造破碎的岩石等原因而使其金丰度值偏高。最新的数据采用了高灵敏度化验分析方法且剔除了矿化、蚀变和破碎的岩石样品，计算出的金丰度值均明显低于或接近于地壳金丰度值。结合其它研究成果，提出绿岩带有关金矿矿源是多源的（变质的、岩浆的），甚至是深源的（下地壳或上地幔）认识。
in recent ten years, much data of the gold abundance of older strata and rocks hadbeen obtained as result of studies on the gold deposits in Archean granite-greenstone belts of NorthChina Platform. But the author considered that the previous data on these studies are highlyinfluence by the lower sensitiveness of chemical analysis and the samples representative ofmineralized, altered and tectonoclastic rocks. The new data which are obtained based on thehigher sensitive chemical analysis and rejecting the samples of mineralized, altered andtectonoclastic rocks are much exact and approach to the gold abundance of the crust. consideredthe other amount of studied information, the author proposed that the gold sources of golddePOsits in Archean granite - greenstone belts are multiple resources, which include metamorphicand magrnatic sources, even deep sources in lower crust/ upper mantle and so on.
出处
《前寒武纪研究进展》
1997年第4期25-34,共10页
Progress in Precambrian Research
关键词
华北地台
花岗岩
绿岩带
含金
丰度值
gold abundance, Archean granite - grenstone belts, North China Platfrom
