新疆霍什布拉克铅锌矿床地质、地球化学特征研究  

GEOLOGICAL AND GEOCHEMICAL CHARACTERISTICS OF HUOSHIBULAKE PB-ZN DEPOSIT IN XINJIANG

作　　者：张志斌[1] 叶霖[1] 李文铅[1] 李朝阳[1] 高珍权[2] 李建峰[1] 徐力峰[1] 

机构地区：[1]中国科学院广州地球化学研究所 [2]中国科学院地球化学研究所,贵州贵阳550002

出　　处：《大地构造与成矿学》2007年第2期205-217,共13页Geotectonica et Metallogenia

基　　金：国家重点基础研究发展规划项目(2001CB409805);中科院创新重要方向性项目(KZCX3-SW-137)资助

摘　　要：新疆霍什布拉克铅锌矿床的矿体和含矿地层的产状一致,主矿体的矿石具有条带状、纹层状构造,矿石中大量发育霉球状、管状和环带状生物结构,显示出层控、热水沉积成因的特点。含矿地层和矿石样品的主量元素PER图解显示含矿碳酸盐岩以含石膏的灰岩为主,围岩的白云岩化微弱,矿化与硅化关系密切。矿石、含矿碳酸盐岩和页岩、粉砂质灰岩和泥质粉砂岩等碎屑岩具有各自鲜明的微量元素分布特征,上层矿体矿石中较强的富集过渡族元素Ti、V、Cr、Mn、Co、Ni、非活动性元素Zr、Hf及大离子亲石元素Sr和Pb,亏损活动性元素Na、K、Rb、Ba和非活动性元素Nb、Th。其围岩重结晶泥晶灰岩富集Ti、Mn、Ni、Sr和Pb,亏损Na、K、V、Fe、Rb、Ba、Zr、Hf、Nb和Th。下层矿体的围岩页岩和泥质、粉砂质灰岩样品的微量元素分布在平均上地壳线附近,部分样品较明显的富集Ti、V、Cr、Mn、Co、Ni、Rb、Y、Zr和Hf,亏损Na、Fe、Sr、Nb。上层矿体矿石和下层矿体围岩中的部分碎屑岩富集强亲岩浆元素Cr、Co、Ni,且上层矿体矿石的稀土元素分布模式具有强的正Eu异常,部分下层矿体围岩具有较明显的正Eu异常。地质和地球化学特征显示该矿床属于热水沉积矿床中的SEDEX型矿床。The ore bodies and their hosting strata of Huoshibulake Pb-Zn deposit show consistent occurrence, and the ores of the main orebody are characterized by striped and laminar structures, in addition to well-developed organic textures such as framboidal spherules, tubular and zonal textures. All of these show that the ore deposit is strata-bound and of hydrothermal origin. The major elemental PER diagrams for samples of ores and ore-hosting rocks reveal that the ore-hosting carbonate rocks are mainly gypsiferous limestones with development of weak dolomitization, and that mineralization is intimately correlated to silicification. The ores, ore-hosting carbonate rocks and clastic rocks including shale, silt limestone and pelitic siltstone all show distinct trace elemental distribution patterns. Ore samples of the upper ore-body are enriched in transitional elements like Ti, V, Cr, Mn, Co and Ni, immobile elements like Zr and Hf, as well as large ion lithophile elements like Sr and Pb, but are depleted in mobile elements such as Na, K, Rb, Ba and immobile elements such as Nb, Th. Samples of recrystallized micritic limestones are enriched in transitional elements like Ti, Mn, Ni, large ion lithophile elements like Sr, Pb, depleted Zr, Hf, Nb, Th, and trace elements of the surrounding rocks for the lower ore-body. Samples of shales, silt limestones and pelitic sihstones distributed near the average upper crust line are obviously enriched in transitional elements like Ti, V, Cr, Mn, Co and Ni, large ion lithophile element Rb and immobile elements like Y, Zr, Hf, but are depleted in Na, Fe, Sr, Nb. All ore samples from the upper ore-body and part of the samples from the lower ore-body and its surrounding rocks are enriched in strong magmaphile elements like Cr, Co and Ni. The rare earth elemental distribution patterns for ore samples from the upper ore-body are characterized by strong positive europium anomaly, while samples from the wall rocks for the lower ore-body show clearly positive europium anomaly, which is lower t

关 键 词：西南天山 霍什布拉克铅锌矿床 热水沉积矿床 矿床地质 矿床地球化学 

分 类 号：P611.1[天文地球—矿床学]