【引用本文】 王忠强, 李超, 江小均, 等. 滇西北休瓦促钼钨矿床白钨矿原位微量和Sr同位素特征及其对成矿作用的指示[J]. 岩矿测试, 2020, 39(5): 767-781. doi: 10.15898/j.cnki.11-2131/td.201907310118
WANG Zhong-qiang , LI Chao , JIANG Xiao-jun , et al. In situ Trace Element and Sr Isotope Composition of Scheelite in the Xiuwacu Molybdenum-Tungsten Deposit, Northwest Yunnan: Constraints on Mineralization[J]. Rock and Mineral Analysis, 2020, 39(5): 767-781. doi: 10.15898/j.cnki.11-2131/td.201907310118

滇西北休瓦促钼钨矿床白钨矿原位微量和Sr同位素特征及其对成矿作用的指示

1. 昆明理工大学国土资源工程学院, 云南 昆明 650093;

2. 国家地质实验测试中心, 北京 100037;

3. 中国地质科学院Re-Os同位素地球化学重点实验室, 北京 100037;

4. 云南锡业集团老厂分公司, 云南 个旧 661000

收稿日期: 2019-08-12  修回日期: 2019-09-02 

基金项目: 国家自然科学基金项目(41673060,41873065)

作者简介: 王忠强,硕士研究生,从事矿物学、地球化学研究。E-mail:kmustwzq@126.com。。

In situ Trace Element and Sr Isotope Composition of Scheelite in the Xiuwacu Molybdenum-Tungsten Deposit, Northwest Yunnan: Constraints on Mineralization

1. Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China;

2. National Research Center for Geoanalysis, Beijing 100037, China;

3. Key Laboratory of Re-Os Isotope Geochemistry, Chinese Academy of Geological Sciences, Beijing 100037, China;

4. Laochang Branch, Yunnan Tin Industry Group, Gejiu 661000, China

Received Date: 2019-08-12
Revised Date: 2019-09-02

摘要:滇西北休瓦促钼钨矿床是义敦岛弧Cu-Mo成矿带南缘典型的热液石英脉型钼钨矿床,目前前人对该矿床主要开展了成岩-成矿年代学、岩石成因、动力学过程等研究。本文以白钨矿为研究对象,利用原位微量LA-ICP-MS以及原位Sr同位素LA-MC-ICP-MS测试技术对成矿流体演化及成矿物质来源开展了系统研究。白钨矿的产状和阴极发光图像显示其存在早中晚三个阶段,以中阶段白钨矿最为发育。早阶段白钨矿稀土配分与斑状二长花岗岩相似,呈轻稀土富集的右倾模式,Eu具有中等负异常(δEu=0.42),Mo平均含量为3.0%,87Sr/86Sr平均值为0.7098,与斑状二长花岗岩(0.7075~0.7098)接近;与早阶段相比,中阶段白钨矿轻稀土含量降低,Eu也具有中等负异常(δEu=0.37),Mo平均含量降低至2445μg/g,87Sr/86Sr值升高至0.7113;晚阶段白钨矿稀土配分呈中稀土相对富集的拱形模式,Eu基本无异常(δEu=0.93),Mo平均含量降低至56μg/g,87Sr/86Sr平均值为0.7083。从早到晚,白钨矿中轻稀土元素尤其是La和Ce的逐渐亏损表明存在氟碳铈镧矿的结晶;δEu升高和Mo急剧降低指示成矿流体从氧化到还原的转换;Sr同位素组成的变化指示了成矿物质来源的转变,早阶段岩浆流体贡献大,在中阶段白钨矿岩浆热液与围岩地层大规模作用下,地层为白钨矿的形成提供了大量Ca,表明强烈的水岩交互作用对矿床的形成发挥了重要作用。

关键词: 白钨矿, Sr同位素, LA-ICP-MS, fs-LA-MC-ICP-MS, 成矿流体演化, 成矿物质来源

In situ Trace Element and Sr Isotope Composition of Scheelite in the Xiuwacu Molybdenum-Tungsten Deposit, Northwest Yunnan: Constraints on Mineralization

KEY WORDS: scheelite, Sr isotope, LA-ICP-MS, fs-LA-MC-ICP-MS, metallogenic fluid evolution, ore-forming material source

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Figures And Tables

滇西北休瓦促钼钨矿床白钨矿原位微量和Sr同位素特征及其对成矿作用的指示

王忠强, 李超, 江小均, 周利敏, 赵九江, 严清高, 李亚东, 陈耀坤