| 广西镇圩式红土型金矿地质特征及成矿模式 |
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| 引用本文：.2001.Geological Characteristics and Metallogenic Model of the Zhenxutype Laterite Gold Deposits in Guangfxi[J].Mineral Deposits,20(3):251~258 |
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| 基金项目:原冶金部黄金地质科研课题(96-98-4-2) |
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| 中文摘要:对镇圩式金矿矿床地质特征及矿物学的研究表明，该类矿床产于峰林洼地、岩溶漏斗等岩溶地貌中；赋矿主岩为红色巾度次强富铝风化壳，其风化壳剖面由下而上的变化特征为：粘土矿物由2：1型向1：1型变化，锰结核及铁的氧化物增多，硅、碱金属含量降低，铝、铁含量增加；自然金形状为不规则粒状、片状、树枝状、针状、浑圆状、次浑圆状，并常与锑钙石、针铁矿、软锰矿连生；金矿源体为叫曼式金矿。文章指出金矿由堆积、淋积作用形成，为岩溶洼地堆积、淋积改造红土型金矿，并建立了矿床成矿模式。 |
| 中文关键词:红土型金矿 镇圩式金矿 地质特征 成矿模式 广西 |
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| Geological Characteristics and Metallogenic Model of the Zhenxutype Laterite Gold Deposits in Guangfxi |
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| Abstract:Through the geological and mineralogical study of the Zhenxu-type gold deposits, the authors hold that this type of deposits are distributed in the peak forest-depression and funnel of karst landforms. The gold source is Jiaoman-type gold deposit. The host is an auriferous red weathering crust, which can be classified into the upper and the lower layers in section. From the lower layer to the upper one, the composition of the clay minerals changes from 2:1 type to 1:1 type, manganese nodule and Fe oxide increase, S102 and K2 O + Na2O decrease, and Al2O3 and Fe2O3 + FeO increase; the weathering crust is thus of intermediate-relatively rich aluminium type. The gold orebodies in the two layers assume stratiform, lenticular and irregular forms. The ores mainly consist of clay minerals. The clastic constituent of the ore is mainly rorueite, which is an important key to find the gold-rich orebody. The romeite occurs within the gold ore in the ellipsoidal and perfectly round shapes. The native gold, which takes irregular, schistose, branching, needle-like, perfectly rounded or subrounded forms, is associated with romeite, goethite and pyrolusite. Ores consist mainly of SiO2, Al2O3, Fe2O3 and CaO. It is pointed out that the Zhenxu-type gold deposits , a special kind of laterite- type gold deposits in South China, were formed by the accumulation and leaching-sedimentation during the lateritization, thus belonging to the laterite-type gold deposits characterized by karst depression accumulation and leaching-sedimentation transformation. The determination of this type of deposits, the formulation of the metallogenic model and the researches on the regularity of the gold concentration can play important guiding roles in the prospecting for this kind of gold deposits. |
| keywords:Laterite-type gold deposit, Zhenxu-type gold deposit, geological characteristics, matell ogenic model, Guangxi |
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