前言在最早对金矿区的描述中,突出了安大略东北部阿比蒂比绿岩带的碳酸盐化岩石与金矿床的一般伴生关系(Burrows,1924;Hurst,1936)。在蒂明斯地区,碳酸盐化玄武岩含有方解石或铁白云石,而碳酸盐化超镁铁岩流则可能含有方解石、白云石或菱镁矿(Fryer 等,1979)。在玄武岩中,方解石和白云石分别产于弱蚀变带和强蚀变带(Fyon 和 Crocket,1981)。在拉德尔湖断裂带的蚀变玄武质岩流和超镁铁岩流中均能观察到类似的矿物组合(Tihor,1978)。 Foreword Earliest descriptions of gold mines highlight the general association of carbonated rocks with gold deposits in the Abidibite greenstone belt in northeastern Ontario (Burrows, 1924; Hurst, 1936). In the Timmins area, carbonate basalts contain calcite or dolomite, while carbonate-derived ultramafic streams may contain calcite, dolomite or magnesite (Fryer et al., 1979). In basalts, calcite and dolomite are produced in weakly altered and strongly altered zones, respectively (Fyon and Crocket, 1981). Similar mineral assemblages are observed in altered basaltic rocks and ultramafic rocks in the Lake Riddle (Tihor, 1978).