广东大宝山多金属矿床同位素特征研究及其意义

Isotope Characteristics of Dabaoshan Polymetallic Deposit in Guangdong Province and Its Significance

热液矿床中硫的来源主要有三种:地幔硫、地壳硫和混合硫。在成矿热液的水-岩反应过程中,岩石中硫在转移进入成矿热液时,其硫同位素组成仍能保持源岩的同位素组成,因此可以根据矿床中硫化物的δ34S所获取的成矿溶液的总硫同位素组成,判断矿床中硫的来源。碳-氢-氧同位素、铅同位素亦能判断矿床成因和大地构造位置。本文对大宝山多金属矿硫同位素、氢-氧同位素、碳-氧同位素、铅同位素进行了系统的分析。

There are three main sources of sulfur in hydrothermal deposits: mantle sulfur, crustal sulfur and mixed sulfur. During the water-rock reaction of ore-forming hydrothermal solution, the sulfur isotopic composition of the source rock can still be maintained when the sulfur in the rock is transferred into the ore-forming hydrothermal solution. Therefore, the source of sulfur in the deposit can be judged according to the total sulfur isotopic composition of the ore-forming solution obtained by δ 34S of sulfide in the deposit. Carbon-hydrogen-oxygen isotopes and lead isotopes can also determine the genesis and tectonic location of the deposit. In this paper, sulfur isotopes, hydrogen-oxygen isotopes, carbon-oxygen isotopes and lead isotopes of the Dabaoshan polymetallic ore deposit are systematically analyzed.