Abstract
On the basis of isotopic ages of hydrothermal deposits and host magmatic rocks in eastern China, combined with geological and geochemical investigations of the deposits, it is suggested that the intervals between the host magmatic rock-and ore-forming times successively increase in order of tungsten-beryllium-niobium-tantalumgb→-lead-zinc(copper)→gold-silver→fluorite deposits. Such time interval sequence is in agreement with the sequence of ore-forming elements arranged in increasing S2980/di values, and also coincides with the change in physicochemical conditions of the ore-forming solutions (temperature and depth become lower and smaller, respectively, and ore-forming fluids vary from magmatic solution to meteoric water as the dominant source). With the growing time interval, the ore-bearing structure commonly changes from extremely crowded joints or fissures to sparsely-distributed faults or fractures.
