| 钾长石中的铅及其对成矿的贡献 |
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| 引用本文： | 张乾,刘志浩,裘愉卓,高计元,王一先.钾长石中的铅及其对成矿的贡献[J].地质与勘探,2004,40(1):45-49. |
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| 作者姓名： | 张乾 刘志浩 裘愉卓 高计元 王一先 |
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| 作者单位： | 中国科学院地球化学研究所,贵阳,550002;中国科学院广州地球化学研究所,广州,510640 |
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| 基金项目： | 国家攀登计划，国家重点基础研究发展计划(973计划) |
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| 摘 要： | 在中-酸性岩浆岩、碱性岩浆岩、片麻岩及混合岩等岩石类型中,钾长石是含铅最高的造岩矿物,其铅含量是全岩铅含量的2～10倍,云母类矿物铅含量的3～16倍,石英铅含量的6～32倍.早元古代、太古宙岩石中钾长石含量低,钾长石中的铅占全岩铅含量的比例低于10%,中元古代以来的碱性岩浆岩、富含钾长石的花岗岩和变质岩,钾长石含量增高,其中所含的铅占全岩铅的比例明显增大,钾长石含量达50%～70%的碱性岩,钾长石中的铅约占全岩总铅量的70%～95%.钾长石在后期极易发生水热蚀变,转变为绢云母、方解石、石英等,在这种转变过程中,铅大量析出进入流体相.这种变化能够为后期铅的成矿提供成矿物质.
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| 关 键 词： | 岩石 钾长石 含铅性 变化特点 成矿作用 |
| 文章编号： | 0495-5331(2004)01-0045-05 |
| 修稿时间： | 2002年11月12 |
LEAD IN POTASSIUM FELDSPAR AND CONTRIBUTION TO MINERALIZATION |
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| ZHANG Qian,LIU Zhi-hao,QIU Yu-zhuo,GAO Ji-yuan,WANG Yi-xian.LEAD IN POTASSIUM FELDSPAR AND CONTRIBUTION TO MINERALIZATION[J].Geology and Prospecting,2004,40(1):45-49. |
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| Authors: | ZHANG Qian LIU Zhi-hao QIU Yu-zhuo GAO Ji-yuan WANG Yi-xian |
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| Institution: | ZHANG Qian~1,LIU Zhi-hao~1,QIU Yu-zhuo~1,GAO Ji-yuan~2,WANG Yi-xian~2 |
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| Abstract: | Potassium feldspar from the middle-acidic and alkaline igneous rocks, gneiss and migmatite possesses the highest lead in comparison with the other rock-forming minerals such as quartz, plagioclase, hornblende, pyroxene, etc. Lead contents in potassium feldspar are 2 to 10 times of the whole rocks, 3 to 16 times of mica and 6 to 32 times of quartz. The rocks of early Proterozoic and Archaean contain the lower potassium feldspar and lead number in potassium feldspar is lower than 10% of lead in the whole rocks. The alkaline rock, kali-granite and metamorphic rocks contain higher potassium feldspar, which content in some rocks may reach 50% to 70% in volume. Lead in potassium feldspar from these rocks reaches the weight of 70% to 95% of the whole rock lead. Potassium feldspar is easily altered and entered generally into sericite, calcite and quartz, etc. In this alteration process, a great quantity of lead in potassium feldspar is released and get into fluids so that to form the ore-forming fluids. Therefore, it is inferred that such changes of lead in potassium feldspar can provide the ore-forming material for late Pb mineralization. |
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| Keywords: | rock potassium feldspar lead changing characteristics mineralization |
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