| 袁小平,薛燕萍,李保飞,苏宏建,刘龙龙.内蒙古北三段银铅多金属矿硫铅同位素、微量元素特征及成矿物质来源[J].矿产勘查,2016,7(3):404-411 |
| 内蒙古北三段银铅多金属矿硫铅同位素、微量元素特征及成矿物质来源 |
| Characteristics of S, Pb isotope composition and trace elements and source of ore-forming materials in the Beisanduan Ag-Pb polymetallic deposit, Inner Mongolia |
| 投稿时间：2015-09-08 |
| DOI： |
| 中文关键词: 硫同位素 铅同位素 微量元素 岩浆作用 内蒙古 |
| 英文关键词: sulfur isotope, lead isotope, trace element, magmatism, Inner Mongolia |
| 基金项目: |
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| 中文摘要: |
| 北三段矿区地处大兴安岭金属省南段,矿区内银、铅、锌等多金属矿产资源丰富,且成矿与岩浆活动具有密切关系。区内出露的岩浆岩主要有闪长玢岩、花岗斑岩、花岗岩,岩石化学成分以高钾、富碱为特征。矿区样品的δ34S值变化范围为-0.24‰~2.37‰,平均值为1.29‰,含量显示矿石中的硫主要来源于深部岩浆,并有少量生物还原硫的加入。铅同位素特征表明铅源物质成熟度较高,且具相对富集铀铅的特点,成矿物质可能由造山带物质和地幔物质两部分提供。花岗岩物源以壳源为主,富集Ba、Th、K 等大离子亲石元素( LILE) ,而高场强元素( HFSE) Nb、Ti 等则相对亏损,其中Sr 和P 出现强烈亏损。 |
| 英文摘要: |
| The Beisanduan deposit is located in the southern section of Xingan mountain metallic provinces. The deposit is rich in Ag, Pb, Zn and other polymetallic elements. The deposit formation has close relationship with magmatic activity. The exposed magmatic rocks are diorite porphyrite, graniteporphyry and granite. The chemical composition of rock is characterized with high potassium and rich alkali. The δ34S values range from - 0.24‰ to 2.37‰ with an average of 1.29‰, it indicated that the sulfur of the ore- forming fluid was derived from hypomagma with the mixture of biological reduction. Lead isotopic results indicate that the maturity of source materials is high and relative rich in uranium and lead. The lead of the ore-forming fluid was derived from orogenic belt materials and mantle materials. The source materials from granite intrusions are probably from crust source and are rich Ba, Th, K and other large ion lithophile elements (LILE),while other high field strength elements are poor such as Nb, Ti elements especially Sr and P. |
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