新疆白杨河大型铍铀矿床成矿流体特征及矿床成因初探
Geochemical characteristics of the ore-forming fluid and ore genesis of the Baiyanghe Be-U deposit, Xinjiang, China
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文摘
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新疆和布克赛尔县白杨河大型铍铀矿床是亚洲最大的铍矿床,其矿体产出于晚石炭世微晶花岗斑岩与上泥盆统塔尔巴哈台组(D3t)中酸性火山岩的接触带上,该矿床为典型的热液矿床。萤石作为白杨河铍铀矿床中与成矿作用密切相关的脉石矿物,发育大量气液包裹体。通过对萤石中流体包裹体的显微测温,获得了其主成矿期包裹体的均一温度,为237~372℃(n=40),平均为308.5℃,反映该矿床为中高温热液矿床。萤石以相对富集中稀土(MREE)((La/Yb)N=3.18-3.55),强烈亏损Eu(δEu=0.01),REE分布模式呈“V”字型为特征。萤石锶钕同位素数据显示出较高的锶同位素初始比值(0.7106),以及正εNd(t)值(3.50~2.95),相似于微晶花岗斑岩的锶钕同位素组成((~(87)Sr/~(86)Sr)=0.7143~0.7466,εNd(t)=4.06-5.29),由此提出成矿流体主要来自微晶花岗斑岩岩浆分异的晚期热液。主成矿期的萤石包裹体显示高温、低盐度的特征,推断成矿流体源于微晶花岗斑岩晚期岩浆热液与大气降水的混合。 |
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其他语种文摘
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Xinjiang Baiyanghe Be-U deposit is the largest Be deposit in Asia. The deposit is typical hydrothermal in origin, characterized by veinlet disseminated and mainly developed on the contact zone between a Late Carboniferous granite porphyry and Late Devonian intermediate-acidic volcanic rocks. Fluorite, as the main gangue mineral of the deposit, is rich fluid inclusions. The homogenization temperature of the primary inclusions ranged from 237 to 372 ℃(n = 40),with an average of 308.5 ℃, suggesting that the Baiyanghe Be-U deposit is a kind of intermediate-high temperature hydrothermal deposit. The chondrite-normalized REE diagram of the fluorite is characterized by enrichment of MREE ((La/Gd)_N = 0.60-0.66), with strong negative Eu anomalies and V-shaped pattern. Similar to isotopic compositions of the granite porphyry ((~(87)Sr/~(86)Sr)_i = 0.7143-0.7466,εNd(t)= 4.06-5.29),fluorite shows high initial Sr isotope ratio (0.7106) and positive eNd(t) values (2.95-3.50),indicating the ore-forming fluid was possibly late magmatic-hydrothermal differentiated from the granite porphyry. As characterized by high temperature and low salinity of the primary fluid inclusions in fluorite, it is deduced that the ore-forming fluid was probably originated from mixing of magmatic hydrothermal and meteoric water. |
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来源
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地球化学
,2013,42(2):143-152 【核心库】
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关键词
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流体包裹体
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锶钕同位素
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萤石
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白杨河铍铀矿床
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西准噶尔
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地址
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中国科学院地球化学研究所, 贵州, 贵阳, 550002
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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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0379-1726 |
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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973计划
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国家科技部支撑计划“305”项目
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文献收藏号
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CSCD:4794120
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