桂西地区二叠系合山组铝土岩的沉积环境
发布时间：2018-11-15 22:40
【摘要】：桂西地区二叠系合山组铝土岩的沉积环境存在海相、陆相之争。通过对桂西二叠系铝土岩的区域调查及钻孔样品微量元素地球化学数据的分析,认为桂西二叠系铝土岩产出于陆相环境。从铝土岩分布情况看,桂西二叠纪各孤立碳酸盐岩台地上均广泛分布铝土岩沉积,该区域产出特征证明矿层是在碳酸盐岩台地全部暴露地表的环境下形成的。从铝土岩层与下伏茅口组灰岩的接触关系来看,铝土岩层底部存在茅口组灰岩砾石,在部分剖面尚见下伏茅口组灰岩中充填铝土岩等现象,说明铝土岩矿化过程直接于茅口组灰岩的古喀斯特面上完成。此外,在矿层中发现古植物根茎化石也是铝土岩形成于陆相环境的有力证据。从微量元素地球化学结果来看,来自铝土岩层样品的硼含量均小于10×10-6,Sr/Ba值范围为0.29~1.61,平均值为0.92,Rb/K值范围为0.0011~0.0025,平均值为0.0017,以上指标结合V/Zr-Zr/Cu图解的判别,结果均指示铝土岩形成于陆相淡水环境。
[Abstract]:The sedimentary environment of the Permian Heshan formation bauxite in western Guangxi has marine and continental contentions. Based on the regional investigation of Permian bauxite in western Guangxi and the analysis of trace element geochemical data of borehole samples, it is concluded that the Permian bauxite occurred in continental environment in western Guangxi. From the distribution of bauxite rocks, bauxite deposits are widely distributed on the Permian isolated carbonate platforms in western Guangxi. The characteristics of bauxite deposits in this region prove that the ore beds were formed in the environment where the carbonate platforms were exposed to the surface of the earth. According to the contact relationship between the bauxite strata and the limestone of the Xiafumaokou formation, there is a maokou limestone gravel at the bottom of the bauxite formation, and some phenomena such as filling the limestone of the Xiafumaokou formation with the limestone of the Xiafumaokou formation can be seen in some sections. It shows that the mineralization process of bauxite is directly completed on the paleo karst surface of Maokou formation limestone. In addition, fossils of paleoplant rhizomes found in ore beds are also strong evidence of the formation of bauxite in terrestrial environments. The results of trace element geochemistry show that the boron content of bauxite rock samples is less than 10 脳 10 ~ (-6) m ~ (-1) Sr / Ba in the range of 0.29 ~ 1.61, the average value is 0.92% Rb / R ~ (-1) K = 0.0011 ~ 0. 0025, and the average value is 0.0017, respectively. The above indexes combined with the V/Zr-Zr/Cu diagram show that the bauxite was formed in the continental fresh water environment.
【作者单位】： 广西地质调查院;中国地质大学(武汉)地球科学学院;
【基金】：中国地质调查局计划项目“南岭成矿带地质矿产调查”子项目“桂西整装勘查区铝土矿床成因与富集规律研究”(编号:12120113064200)~~
【分类号】：P618.45
本文编号：2334610
[Abstract]:The sedimentary environment of the Permian Heshan formation bauxite in western Guangxi has marine and continental contentions. Based on the regional investigation of Permian bauxite in western Guangxi and the analysis of trace element geochemical data of borehole samples, it is concluded that the Permian bauxite occurred in continental environment in western Guangxi. From the distribution of bauxite rocks, bauxite deposits are widely distributed on the Permian isolated carbonate platforms in western Guangxi. The characteristics of bauxite deposits in this region prove that the ore beds were formed in the environment where the carbonate platforms were exposed to the surface of the earth. According to the contact relationship between the bauxite strata and the limestone of the Xiafumaokou formation, there is a maokou limestone gravel at the bottom of the bauxite formation, and some phenomena such as filling the limestone of the Xiafumaokou formation with the limestone of the Xiafumaokou formation can be seen in some sections. It shows that the mineralization process of bauxite is directly completed on the paleo karst surface of Maokou formation limestone. In addition, fossils of paleoplant rhizomes found in ore beds are also strong evidence of the formation of bauxite in terrestrial environments. The results of trace element geochemistry show that the boron content of bauxite rock samples is less than 10 脳 10 ~ (-6) m ~ (-1) Sr / Ba in the range of 0.29 ~ 1.61, the average value is 0.92% Rb / R ~ (-1) K = 0.0011 ~ 0. 0025, and the average value is 0.0017, respectively. The above indexes combined with the V/Zr-Zr/Cu diagram show that the bauxite was formed in the continental fresh water environment.
【作者单位】： 广西地质调查院;中国地质大学(武汉)地球科学学院;
【基金】：中国地质调查局计划项目“南岭成矿带地质矿产调查”子项目“桂西整装勘查区铝土矿床成因与富集规律研究”(编号:12120113064200)~~
【分类号】：P618.45
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