| 黄铁矿与沥青铀矿的共生条件及在沥青铀矿形成过程中所起作用的实验研究 |
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| 引用本文： | 赵凤民,沈才卿.黄铁矿与沥青铀矿的共生条件及在沥青铀矿形成过程中所起作用的实验研究[J].铀矿地质,1986(4). |
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| 作者姓名： | 赵凤民 沈才卿 |
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| 摘 要： | 高价铁与高价铀混合溶液在还原场中形成了共生的黄铁矿与沥青铀矿,该过程必须在弱酸性-中性-碱性介质中进行,其中在弱酸性至中性介质中易形成大的黄铁矿单晶。高价铀溶液流经黄铁矿矿区时,若在高温高压条件下,有新生的黄铁矿或白铁矿与沥青铀矿共生。黄铁矿还原六价铀形成沥青铀矿时,起还原作用的是二价硫。赤铁矿常与沥青铀矿共生,但它们是热液演化过程中不同阶段的产物,赤铁矿形成于体系氧逸度高的氧化环境,沥青铀矿形成于体系氧逸度低的还原环境,赤铁矿形成于沥青铀矿之前。
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| 关 键 词： | 沥青铀矿 黄铁矿 赤铁矿 共生 S~(2-)还原作用 |
EXPERIMENTAL RESEARCHES ON PARAGENETIC CONDITION FOR PYRITE AND PITCHBLENDE AND ITS ROLE IN PITCHBLENDE FORMATION PROCESS |
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| Zhao Fengmin Shen Caiqing.EXPERIMENTAL RESEARCHES ON PARAGENETIC CONDITION FOR PYRITE AND PITCHBLENDE AND ITS ROLE IN PITCHBLENDE FORMATION PROCESS[J].Uranium Geology,1986(4). |
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| Authors: | Zhao Fengmin Shen Caiqing |
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| Institution: | Zhao Fengmin Shen Caiqing |
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| Abstract: | Abstract The.paragenesis Of pyrite and pitchblende was formed under reduction state in the Fe(III)and U (VI) mjxing solution.This process must be proceeded in the weakly lacidic-neutral-alkali medium as in the weakly acidic to neutral medium 1arger pyrite monocrystals are easy to be formed. Whan U(VI)so1utiOtnS pass through pyrite zone utider the high temperature alld pressure COnditions,new pyrite or marcasite will be prodUCed and associ- ated with pitchblende.When U(VI)is reduced by pyrite to form pitchblende, S(II) in the pyrite may serve as a reductant.Hematites are often in parage- nesis with pitchblende,but they are products of different stageS in hydrother- mal eVo1Ution process.Hematite occurred in the OXidation environment with high fugacity Of oxygen. while pitchblende occurred in the reduction envi- ronment with IOW fugacity of oxygern.Hematite Was formed prior to pitchb- 1ende. |
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| Keywords: | Pitchblende Pyrite Hematite Paragenesis Reduction of S~(2-) |
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