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本文提供了一组小秦岭金矿区的~(40)Ar/~(39)Ar定年数据。根据地质体的形成温度和被测定矿物封闭温度之间的关系,讨论了各个年龄的地质含义。认为东闯钾长花岗岩墙和文峪二长花岗岩体分别形成于印支期和燕山早期,主要金矿化发生在文峪二长花岗岩体已固结之后(132Ma)。自1.3Ga以来,本区遭受过的区域性热事件温度不会超过350℃。
This paper provides a set of ~ (40) Ar / ~ (39) Ar dating data for Xiaoqinling gold deposit. According to the relationship between the formation temperature of geologic body and the closed temperature of the mineral being measured, the geological meaning of each age is discussed. It is concluded that the Dongchuangchuan granite wall and the Wenyu granodiorite were formed in the Indosinian and Early Yanshanian, respectively. The main gold mineralization took place after the Wenyu granite body had been consolidated (132 Ma). Since 1.3Ga, the temperature of the regional thermal event suffered by this zone will not exceed 350 ℃.