滇东北茂租铅锌矿床热液方解石稀土元素地球化学特征
REE Geochemical Features of Hydrothermal Calcite from Maozu Pb-Zn Deposit, Northeastern Yunnan Province, China
查看参考文献13篇
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文摘
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滇东北茂租铅锌矿床赋存于震旦系灯影组白云岩中,矿体呈似层状、脉状和不规则状,矿石主要由黄铁矿、闪锌矿、方铅矿、方解石和白云石等组成。方解石是该矿床中最为主要的脉石矿物,其形成贯穿整个成矿过程。本文选择与硫化物紧密共生的团斑状方解石为研究对象,借助等离子体质谱仪(ICP-MS),获得了5件热液方解石的稀土元素含量数据。结果显示,全部样品的总稀土元素含量较低(ΣREE=19.56×10~(-6)~62.55×10~(-6)),轻、重稀土元素间分异较明显[ΣLREE/ΣHREE=1.30~10.83,(La/Yb)_N=2.83~31.40]。全部样品的(La/Sm)_N(0.92~6.30)和(Gd/Yb)_N(3.08~5.24)值表明轻稀土和重稀土元素内部分异不显著,δEu=1.87~4.27,呈明显的Eu正异常特征,而δCe=0.83~1.18,显示Ce异常特征不明显。茂租铅锌矿床中热液方解石稀土元素含量、配分模式及相关参数与赋矿围岩灯影组白云岩不同,与区域上不同时代地层沉积岩及二叠纪峨眉山玄武岩也不同,但与会泽超大型铅锌矿床中的团斑和脉状热液方解石相似,暗示茂租铅锌矿床成矿流体中的REE来源与可能会泽矿床相似。结合同标本的C-O同位素组成和Sm-Nd同位素年龄,认为茂租铅锌矿床形成于晚三叠纪(196±13 Ma),其成矿流体中的不同组分具有不同的来源,可能与川滇黔铅锌矿床属于同构造热事件的产物,与VMS、SEDEX和MVT型不同,暂归为川滇黔型。 |
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其他语种文摘
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Maozu Pb-Zn deposit is hosted in dolomite from the Sinian Dengying Formation. Its ore bodies show bedded, vein and irregular shapes. Ores are composed of pyrite, sphalerite, galena, calcite and dolomite. Calcite is the most important gangue minerals, which forms throughout the ore-forming process. Porphyritic hydrothermal calcites coexisting with sulfides are chosen as research object, with ICP-MS, the contents of rare earth element are obtained. The results show that contents of total REE are lower (ΣREE range from 19.56×10~(-6) to 62.55×10~(-6)), and differentiations between LREE and HREE are obvious (ΣLREE/ΣHREE range from 1.30 to 10.83, (La/Yb)_N range from 2.83 to 31.40). The ratios of (La/Sm)_N (0.92–6.30) and (Gd/Yb)_N (3.08–5.24) show that the internal differentiations of LREE and HREE are not obvious. δEu values range from 1.87 to 4.27, showing an obviously Eu positive anomaly, but δCe values range from 0.83 to 1.18, not showing an anomalous feature of Ce. The REE contents and distribution patterns and parameters are not only different from that of the host Dengying Formation dolomite, but also different from the country sedimentary rocks and the Permian Emeishan basalts. However, it is similar with porphyritic and vein hydrothermal calcite in Huize super-large Pb-Zn ore deposit, which suggests that the sources of REE in hydrothermal fluids of Maozu Pb-Zn deposit are similar with those of Huize deposit. Associated with C-O isotopic compositions and Sm-Nd isotopic age of the same samples, Maozu Pb-Zn deposit is considered to be formed during the Late Triassic (196±13 Ma) and its different constituents in the hydrothermal fluids have different sources. The origin of Maozu Pb-Zn deposit may be the product of the same structural thermal events occurring in the Sichuan-Yunnan-Guizhou Pb-Zn metallogenic province, which is different from the known VMS, SEDEX and MVT-types, and is named as the SYG-type in this paper. |
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来源
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矿物学报
,2013,33(4):681-685 【核心库】
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关键词
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热液方解石
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稀土元素
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成矿流体来源
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茂租铅锌矿床
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地址
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
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云南省有色地质局, 云南, 昆明, 650051
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昆明理工大学国土资源工程学院, 云南, 昆明, 650093
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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国家自然科学基金项目
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国家973计划
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文献收藏号
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CSCD:4968250
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