哈图金矿带成矿流体组分、硫同位素分析及矿床成因  

Ore-forming Fluid Composition,Sulfur Isotope Analysis of and Genesis of the Hatu Gold Metallogenic Belt in Xinjiang

作　　者：李晶[1,2] 许英霞 申萍[2] 潘鸿迪[3] 钟世华[2] 李昌昊[2] 郭勃巍 

机构地区：[1]华北理工大学,河北唐山063009 [2]中国科学院地质与地球物理研究所,北京100029 [3]长安大学地球科学与资源学院,陕西西安710054

出　　处：《地质与勘探》2016年第2期199-208,共10页Geology and Exploration

基　　金：国家自然科学基金项目(U1303293;41390442;41272109);国家305项目(2011BAB06B01);中国科学院重点部署项目(KJZDEW-TZ-G07);国际科技交流与合作专项(2010DFB23390)联合资助

摘　　要：哈图金矿带位于新疆西准噶尔地区,是新疆北部最重要的金成矿带之一。哈图金矿带内依次分布有哈图(齐Ⅰ)、齐Ⅱ、齐Ⅲ、齐Ⅳ以及齐Ⅴ五个金矿床(点),其成矿作用和地质特征相似。本文重点对哈图、齐Ⅱ和齐Ⅴ金矿石英脉样品中的石英进行了流体包裹体成分分析,结果显示三者流体包裹体具类似成分特征。气相成分均以H_2O为主,其次是CO_2和CH_4,液相成分为Cl^-+SO_4^(2-)+Na^++K^+组合。按成矿作用从早至晚,流体中H_2O的含量增加,而CO_2含量和Cl^-+SO_4^(2-)+Na^++K^+含量均显著降低。对三个金矿床的矿石样品中的黄铁矿进行了硫同位素分析,δ^(34)S值为-2.0~3.7‰,集中于±0‰附近,表明三者具相同的硫同位素来源,其可能来源于岩浆流体或容矿岩石-玄武岩。哈图金矿带矿床的赋矿围岩、控矿构造、矿石类型和热液蚀变、成矿流体等方面与造山型金矿床相应特征相符,因此认为哈图金矿带中,哈图(齐Ⅰ)、齐Ⅱ和齐Ⅴ金矿均属造山型金矿床。The Hatu gold metallogenic belt is located in west Junggar, one of the most significant gold metallogenic zones in northern Xinjiang. It includes QⅠ（Hatu）, QⅡ, QⅢ, QⅣ and QⅤ gold deposits, which bear similar mineralization and geological characteristics. The quartz samples from Hatu,QⅡ, and QⅤ gold deposits are selectively analyzed for mass fluid inclusions analysis. The results show that the three deposits have similar composition. The gas phase composition is mainly H2O with CO2 and CH4, while the liquid phase composition is mainly Cl^-＋SO4^2-＋Na^＋＋K^＋. The ore-forming fluid has increasing H2O and decreasing CO2 and Cl^-＋SO4^2-＋Na^＋＋K^＋. Meanwhile, the pyrite from ore samples of the three deposits is made for sulfur isotope composition analysis. And the results show that δ34S of them is -2.0‰-3.7‰ concentrating on ±0‰, which indicates that the three deposits are derived from the some source of sulfur.The source may be magma genesis or the ore-hosted rocks-basalt. The geological features such as host rocks, conform to that of orogenic gold deposit,thus suggesting that Hatu, QⅡ, and QⅤ gold deposits in Hatu metallogenic belt are of the orogenic gold deposit.

关 键 词：成矿流体成分 硫同位素 造山型金矿 哈图金矿带 新疆 

分 类 号：P612[天文地球—矿床学]