Archaean carbon reservoirs and their relevance to the fluid source for gold deposits

It is commonly assumed that seawater-derived carbon in altered volcanic rock is the only major pre-metamorphic carbon-in-carbonate reservoir in Archaean greenstone belts. A study which shows why the mere existence of two carbon-in-carbonate reservoirs and variation in carbon isotope ratios between individual gold deposits negate some of the fundamental assumptions used to support magmatic-fluid models is discussed.