| 河南巩县铝土矿及其含矿岩系的岩石学矿物学特点 |
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| 引用本文： | 张乃娴,姬素荣.河南巩县铝土矿及其含矿岩系的岩石学矿物学特点[J].地质科学,1985,0(2):170-179. |
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| 作者姓名： | 张乃娴 姬素荣 |
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| 作者单位： | 中国科学院地质研究所 |
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| 摘 要： | 河南巩县铝土矿位于华北地台的南部,其基底岩系为前寒武纪的变质岩系,其上有震旦系、寒武系和下、中奥陶统的地层。中奥陶统灰岩层是铝土矿的直接底板,灰岩的顶面凹凸不平,多被铁质浸染呈黄褐色,局部地方有残积的贫铁矿层,中石炭统铝土矿层呈平行不整合覆盖其上。
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| 关 键 词： | , |
| 收稿时间： | 1983-04-04 |
| 修稿时间： | 1983-04-04; |
PETROGRAPHIC AND MINERALOGICAL CHARACTERISTICS OF BAUXITE AND SERIES OF ORE-BEARING IN GONGXIAN COUNTY, HENAN PROVINCE |
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| Zhang Naixian,Ji Surong.PETROGRAPHIC AND MINERALOGICAL CHARACTERISTICS OF BAUXITE AND SERIES OF ORE-BEARING IN GONGXIAN COUNTY, HENAN PROVINCE[J].Chinese Journal of Geology,1985,0(2):170-179. |
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| Authors: | Zhang Naixian Ji Surong |
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| Institution: | Institute of Geology, Academia Sinica, Beijing |
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| Abstract: | The bauxite deposit introduced in this paper is one of the most important bauxite deposit in China. The bauxite consists mainly of diaspore, dickite, kaolinite, chlorite, pyrophyllite, hydromica, Muscovite, mixed-Layer minerals and a few heavy minerals. The diaspore is a main Al-bearing mineral appearing as cryptocrystalline, rnicrogranu-lar, and small-columnar crystals. In mica group, the content of 2M-type muscovite is relatively higher and gydromica is less. The. chlorite is rich-Al dioctahedro-chlorite. The dickite occurs in the bauxites in the form of pisolitie-oolitic aggregate and apparently is an authigenic mineral. The bauxites are chemically characterized by that the content of Al2O3 increases with the content of TiO2, and decreases with the increses in the content of SiO2. The main petrological structures of the bauxites include fragmen-tal. piso-oolitic, laminated, and funnel structures.The mineral association of this deposit is complex. The association closely related with its total chemical composition on the one hand and with physical and chemical conditions on the other hand. The change of minerals is controlled by the process and degree of the diagenetic variation. |
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