江西大湖塘石门寺钨矿硫同位素特征及成矿物质研究

Geochemical Characteristics and Source of Ore Forming Material of the Shimensi Tungsten Deposit in Dahutang, Jiangxi Province

为探讨大湖塘石门寺钨矿床的成矿物质来源,以大湖塘石门寺钨矿床为研究对象,从野外采样、岩矿鉴定、稳定同位素分析等方面,初步探讨大湖塘石门寺钨矿床矿床地球化学特征和成矿物质来源。针对隐爆角砾岩型和细脉浸染型样本中的S同位素进行测定,选取了27个样本进行测定,测定结果显示隐爆角砾岩型矿床的δ34S的值高于细脉浸染型矿床的可能性要更大,且样品的δ34S值具有明显的塔式分布特征,矿床硫化物的硫同位素组成较为稳定。总δ34S值都接近幔源硫,表明S主要来自于深部岩浆或者上地幔。稳定同位素研究成果显示:大湖塘石门寺矿区燕山期花岗岩为钨矿的矿源层,矿区内的成矿物质主要来源于大湖塘燕山期S型花岗岩岩浆,但不排除成矿流体在上升的过程中萃取了一部分围岩的成矿物质。

The tungsten deposit of Shimensi in Dahutang was studied to explore the source of the ore-forming materials The geochemical characteristics and source of ore-forming materials of Tungsten deposit were studied from field sampling, rock and mineral identification, stable isotope analysis and other aspects. Sulfur isotopes in the samples of the concealed explosive angle conglomerate type and the fine vein disseminated type were determined, and 27 samples were selected for determination. Results show that the value of delta34 S of the concealed explosive angle conglomerate type deposit was higher than the fine vein disseminated type deposit. The delta34 S value of the sample had an obvious characteristic of ower distribution. Sulfur isotopic composition of sulfide deposits in the ore deposit was relatively stable. The total value of delta34 S was close to the mantle source of sulfur, which meant sulfur was mainly derived from the deep magma or the upper mantle.Research results showed that the granite in Shimensi mining area of Yanshan period was a mineral source layer of tungsten.The ore-forming materials were mainly derived from the sulfur type granite magma in the Great Lakes of Yanshan period.However, situation did not exclude that other ore forming materials were extracted in the rising process.