用红外光谱方法确定微细浸染型金矿床的成矿温度

Determination of Metallogenic Temperature of Fine Disseminated Gold Deposits by Way of Infrared Spectroscopic Method

本文用干酪根的红外光谱方法，分析了广西金牙金矿的成矿温度为２５５—３００℃。比包裹体均一法测定结果温度范围更窄。该方法样品用量只需０．２—０．５ｍｇ干酪根。碎屑镜质体反射率测定和Ｒｏｃｋ—Ｅｖａｌ热解分析证实了红外测温的正确性。以广西金牙金矿为例，探讨了确定微细浸染型金矿成矿温度的另一有效途径。在缺乏镜质体的海相地层和前泥盆纪地层中，应用该方法分析古地温更具有实际意义。

The metallogenic temperature of Jinya gold deposit in Guangxi province has been analysed by way of infrared spectroscopic method in the paper, which is 255-300℃.It has a narrower temperature range than that measured by inclusion homogenization method. In the disscussed method, only small amount of samples (0. 2-0. 5mg kerogen ) are needed. Taking Jinya gold deposit in Guangxi as an example, another effective way of determining the metellogenic temperature of fine disseminated gold dePOsits is disscussed, which is confirmed by the Rock-Eval analyses and the elastic vitrinite reflectance measurment.This method has a practical significance if it is used to determine palaeogeotherm in the marine and pre-Devonian strata which are lacking in vitrinite.