| 辽吉内生硼矿反吸收性金云母的发现及其地质意义 |
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| 引用本文： | 黄作良,王濮.辽吉内生硼矿反吸收性金云母的发现及其地质意义[J].化工矿产地质,1994(1). |
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| 作者姓名： | 黄作良 王濮 |
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| 作者单位： | 化学工业部化学矿产地质研究院，中国地质大学 |
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| 摘 要： | 在对辽吉内生硼矿床的矿物学研究中，笔者于营口后仙峪硼矿床首次发现了反吸收的金云母。相对于正常金云母，从围岩到矿体逐渐增多，矿体中几乎均为反吸收性的金云母。对其进行的电子探针以及穆斯堡尔谱的研究表明，同正吸收的金云母相比，反吸收性金云母的Ｓｉ－Ａｌ四面体位置上Ａｌ３＋亏损，Ｆｅ３＋替代Ａｌ３＋占据四面体位置；当金云母四面体中Ｆｅ３＋的量是总铁量的２２％以上，即在一种相对贫Ａｌ氧化的条件下就形成反吸收性的金云母。它具有明显的成因标型特征，对找寻硼矿具有重要的指示意义。
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| 关 键 词： | 金云母，反吸收性，硼矿床 |
DISCOVERY AND GEOLOGICAL SIGNIFICANCE OF REVERSED PLEOCHROISM PHLOGOPITE IN THE ENDOGENETIC BORATE DEPOSITS ACROSS THE LIAONING-JILING REGION |
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| Abstract: | Abstract A reversed pleochroism phlogopite is discovered for the first time in Houxianyu borate deposit, Liaoning province, in the course of mineralogical researches on the endogenetic borate deposits across the Liaoning- Jilin region. Unlike normally pleochronic phlogopite,the anomalously optieal mineral tends to increase in amount progresively towards the bodies until almost entirely taking the place of the former inside them. Support for the increase is drawn through electric probe and Mossbaure spectra examinations revealing that,when vacuities take place in the Al3+ sites of the crystal tetrahedrons of normal phlogopite, Fe3+ will displace the Al3+ into the tetrahedrons. Under the Al - poor oxidative conditions, once the Fe3+ displacements exceed 22% the normally pleochronic phlogopite would convert into reversely pleochronic ones. As genesis- definting mineral,this sort of phlogopite As genetic ty pomorphic mineral,may also be a guide mineral to prospecting for endogenetic borate deposits. |
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