| 叙永式埃洛石矿中矿物演化的研究 |
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| 引用本文： | 周国平.叙永式埃洛石矿中矿物演化的研究[J].矿物学报,1990,10(1):46-51,T004. |
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| 作者姓名： | 周国平 |
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| 作者单位： | 中国地质科学院矿床地质研究所 北京 |
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| 摘 要： | 川、黔、滇交界处的埃洛石矿俗称“叙永石”,产于上二叠乐平统龙潭页岩和下二叠阳新统茅口灰岩的卡斯特侵蚀面间。成矿母岩为上二叠乐平统含黄铁矿的高岭石粘土岩。母岩在风化淋滤期间经历以下变化:(1)黄铁矿氧化成针铁矿;(2)高岭石从有序向无序转化,最终转变成埃洛石;(3)锐钛矿作为稳定相残留富集于剖面上部。形成的矿物组合以10埃洛石为主,包括伊利石、伊利石/蒙脱石混层矿物、三水铝石、三羟铝石、石膏、水铝英石和石英。
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| 关 键 词： | 叙永式埃洛石 高岭石 粘土矿物 风化淋滤作用 矿物演变 伊利石 蒙脱石 |
A STUDY ON THE EVOLUTION OF MINERALS IN XUYONG HALLOYTE DEPOSIT |
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| Zhou Guoping.A STUDY ON THE EVOLUTION OF MINERALS IN XUYONG HALLOYTE DEPOSIT[J].Acta Mineralogica Sinica,1990,10(1):46-51,T004. |
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| Authors: | Zhou Guoping |
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| Abstract: | The Xuyong halloysite deposit located in the contiguous area of Sichuan,Guizhou and Yunnan provinces is known as Xuyong stone which occurs at the erosional surface of karst between the upper Permian Longtan shales of the Leping series and the lower Permian Maokou limestones of the Yiangxin series.The parent rocks in which halloysites were formed are pyrite-bearing kaolinitic claystones of the upper Permian Leping series. The parent rocks experienced such transformations during the weathering-leaching process as:(1) the oxidation of pyrite into goethite; (2)the transformation of kaolinite from the ordered structure to the disordered structure and finally to halloysite; and (3)anatase remains as a stable mineral phase in the upper parts of the weathering profile during the weathering-leaching process.The mineral assemblage consists mainly of pure 10 halloysites including illite,I/M mixed-layer minerals,gibbsite,gypsum and quartz. |
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| Keywords: | halloyslte kaolinitic clay mineral evolution weathering-leachlng |
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