GEOCHEMISTRY OF TRACE ELEMENTS DURING ORE-FORMING PROCESSES IN YINSHAN DEPOSIT
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摘要: 对银山矿床中矿石、岩体和矿体的蚀变围岩及其原岩的稀土及微量元素特征研究表明, 热液蚀变作用导致蚀变岩的∑ REE普遍升高, 而近岩体∑ REE则稍低于原岩.蚀变围岩出现Eu亏损, w(LREE)/w(HREE)值亦较原岩低.定量计算表明, ∑ w(REE)总升幅中有31% 以下是由围岩质量迁移引起的表观浓缩现象, 而另外的69%以上的效应则因流体带入了REE所致.热液具有w(LREE)/w(HREE)值低、强Eu正异常的特征.热液的还原性质促使Eu3+还原为Eu2+而被活化迁出, 导致围岩的Eu负异常扩大; Sr普遍地比原岩降低, Ba普遍显著地升高, 而Rb则相对稳定; Hf, Th, U, V, Cr, Co, Nb, Mo, Ta, Zr表现为不活动或弱活动性, 成矿元素Cu, Pb, Zn, Ag和Sn等被大量带入, Y, Sc被活化迁出.Abstract: Detailed studies have been conducted of the trace elements in ores, wallrocks of intrusion and orebodies in the Yinshan deposit. It is shown that∑ REE increased in all samples but those close to the intrusion and orebodies decreased.Altered wallrocks are characterized by lower w(LREE)/w(HREE)ratios and depleted in Eu compared with their fresh counterpart. It is suggested by calculation that less much. While E.D.Weinberg expanded the G.Bertrand law and further revealed that certain quantity of manganese may allow some bacteria to grow well but may not be suitable for them to produce bacteriophage. Biologic vital double threshold element content and its physiological effect can be expanded to different hydrogeochemistry zones in hydrogeologic unit. In elements lioxiviated(leached), transferred strongly hydrogeo-chemistry zone, biologic physiological effect and element content show negative correlativity. In elements enrichment, lioxiviated, concentration by evaporation hydrogeochemistry zone and environment polluted by some elements superfluous, biologic physiological negative effect and element content show positive correlativity, between them which above is the element content fitting zone. Take the Lishi-Liulin hydrogeologic unitof Shanxi Province as an instance: The lack of selenium, iodine and fluorine in the hydrochemistry zone with element leaching and loss causes KBD, IDD, and tooth decay, which is in a negative correlativity with element content, respectively. While in the element lioxiviation and enrichment zone, fluorine is superfluous.As a result, endemic fluorosis occurs and its sick rate shows positive correlativity with content.
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图 1 银山矿床-60 m中段围岩蚀变及采样位置
Fig. 1. Sketch map showing wallrock alteration and sampling location on -60 m level in Yinshan deposit
图 2 银山矿床围岩、岩体及矿体的稀土元素配分曲线
a.岩体的围岩; b.矿体的围岩; c.矿石
Fig. 2. Chondrite-normalized REE patterns of sericite-phyllite, magmatic rocks and ores in Yinshan deposit
图 3 银山矿床蚀变围岩以原岩标准化的微量元素分布曲线
Fig. 3. Average original rocks normalized diagram of REE and other trace elements in altered wallrock in Yinshan deposit
图 4 岩体及矿体蚀变围岩中SiO2及REE质量分数的变化趋势
Fig. 4. Variation diagrams of SiO2and REE in altered sericite-phyllite around intrusion and ore bodies in Yinshan deposit
图 5 以原岩的w(REE)/w(Zr)值标准化的蚀变围岩中w(REE)/w(Zr)值的变化趋势
Fig. 5. Average original rocks normalized diagram of w(REE)/w(Zr) of altered wallrock in Yinshan deposit
表 1 银山矿床岩体、矿石及围岩的元素组成及部分计算参数值
Table 1. Element compositions of ores, phyllite and intrusion in Yinshan deposit
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