投稿时间：2015-05-26
修订日期：2016-06-20
网络发布日期：2016-08-25
中文摘要:卡拉塔格矿集区梅岭铜（金）矿床位于新疆吐哈盆地南缘的古生代卡拉塔格隆起带中，在大地构造位置上处于大南湖-头苏泉晚古生代岛弧带中段的火山盆地中，赋存于一套基性-中性-酸性火山岩-火山碎屑岩和次火山岩中，矿体由细脉浸染状（M1）和热液脉状（M2）的铜矿体组成。文章在前人研究的基础上开展了矿床中石英流体包裹体的测温分析、成分分析及包裹体水的氢、氧同位素分析。研究发现，梅岭矿床中原生流体包裹体类型多为气液两相包裹体，个体较小，气相分数较小；流体包裹体均一温度为117~238℃，w（NaCleq）为2.4%~9.3%，为中-低温、中-低盐度流体；成矿压力为6.8~60.6 MPa，成矿深度约为0.2~2.0 km。流体包裹体气相成分以H2O为主，其次为CO2，并含有少量CH4、CO等还原性气体；液相成分中阳离子以K+、Na+为主，阴离子以Cl-和SO42-占主导地位，成矿流体属H2O-NaCl体系。成矿流体的δ18O水值为-5.75‰~-2.61‰，δD值为-135.6‰~-117.2‰，表明成矿流体主要为岩浆水及大气降水的混合水。流体包裹体的研究成果和矿床地质特征显示，梅岭铜（金）矿床属于浅成低温热液矿床。梅岭铜锌（金）矿床成矿流体研究为矿床成因提供了成矿流体特征方面的证据，为该区成矿系统的综合研究提供了理论依据。
Abstract:Located in the Paleozoic Kalatage uplift on the southern margin of Tu-Ha basin in eastern Xinjiang, the Meiling copper (gold) deposit occurs in the Mesozoic volcanic basin superimposed upon the middle part of Late Paleozoic Dananhu-Tousuquan accretionary arc. The orebodies are hosted by basic-neutral-acid volcanic, volcaniclastic and sub-volcanic rocks, consist of veinlet disseminated sulfide orebodies and a sulfide-silicate stockwork vein system. In this paper, the authors studied the homogenization temperature and the hydrogen and oxygen isotopic compositions of the fluid inclusions based on the previous researches, with the purpose of revealing the characteristics of the ore-forming fluid and the ore-forming material source and, what is more, exploring the genetic type of the Meiling deposit. The fluid inclusions mainly consist of aqueous fluid inclusions, characterized by very small and sparse and small gas to liquid ratios, the medium-low homogenization temperature (ranging from 117℃ to 238℃) and the medium-low salinity (ranging from 2.4% to 9.3%). The ore-forming pressure varies from 6.8 MPa to 60.6 MPa, and ore-forming depth varies from 0.2 km to 2.0 km. The ore-forming fluid belongs to the H2O-NaCl system with the gas phase mainly composed of H2O together with minor CO2, while the liquid phase is mainly composed of Na+, K+, Cl- and SO42-. The hydrogen and oxygen isotopic compositions of fluid inclusions show that the δ18OH2O value varies from -5.75‰ to -2.61‰ whereas the δD value varies from -136‰ to -117‰. It is therefore held that the ore-forming fluid was the mixture of magmatic water and atmospheric water. In summary, all the geological and fluid characteristics indicate that the Meiling copper (gold) deposit belongs to the epithermal copper deposit. The research on ore-forming fluid of the Meiling copper(gold)deposit provides the evidence of the ore-forming fluid characteristics for the genesis of the deposit and fills in the research gap of previous studies. What's more, the research provides a train of theoretical basis for the comprehensive study of the metallogenic system.
keywords:geochemistry fluid inclusion hydrogen-oxygen isotope Meiling copper-zinc (gold) deposit East Tianshan Mountains Xinjiang
文章编号：
中图分类号：P618.41;P618.43;P618.51
文献标志码：
基金项目:本文得到"十二五"国家科技支撑计划项目（编号：2011BAB06B04-03）、中国地质调查局基础性公益性矿产地质调查项目（编号：DD20160071）和国土资源部公益性行业科研专项经费项目（编号：201411026）的资助
引用文本：
于明杰,王京彬,毛启贵,方同辉,张锐.2016.新疆东天山卡拉塔格矿集区梅岭铜锌(金)矿床成矿流体特征及地质意义[J].矿床地质,35(4):829~845YU MingJie,WANG JingBin,MAO QiGui,FANG TongHui,ZHANG Rui.2016.Characteristics of ore-forming fluids of Meiling copper-zinc (gold) deposit in Kalatage ore concentration area of East Tianshan Mountains, Xinjiang, and their geological significance[J].Mineral Deposits35(4):829~845
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