桂西南下雷锰矿床地球化学特征及沉积环境分析

发布时间：2018-06-28 23:38

本文选题：晚泥盆世 + 锰矿床　；参考：《地质与勘探》2016年01期

【摘要】：晚泥盆世五指山组是桂西南地区重要的含锰地层,为一套硅质-泥质-灰质及其过渡相组成的深水台沟相沉积。锰矿体的形态和展布受岩相组合和构造条件的控制。本文分析了含锰岩系的主量及微量元素地球化学:含锰岩系的V/(V+Ni)、V/Cr、U/Th、Ni/Co值,U、V和Mo等氧化还原敏感元素的富集程度显示研究区含锰岩系形成于弱氧化-富氧环境。另外,含锰岩系的Fe/Ti、Al/(Al+Fe+Mn)、Si O2/Al2O3、Ba/Sr及Co/Zn比值及稀土元素Eu正异常特征均显示热水沉积物的特征,在Si O2-Al2O3、Fe/Ti-Al/(Al+Fe+Mn)、log U-log Th、(Ni+Cu+Co)×10-Fe-Mn关系图解中,样品投影点均落在热水沉积区内,反映锰的富集和成矿过程与热水活动的参与密切相关。含锰岩系的La/CeAl2O3/(Al2O3+Fe2O3)、100×(Fe2O3/Si O2)-100×(Al2O3/Si O2)、Fe2O3/(100-Si O2)-Al2O3/(100-Si O2)、Fe2O3/Ti O2-Al2O3/(Al2O3+Fe2O3)图解及稀土元素特征,均指示含锰岩系形成于被动大陆边缘背景。
[Abstract]:The late Devonian Wuzhishan formation is an important manganese bearing formation in southwestern Guangxi. It is a set of deep-water platform trench facies composed of siliceous muddy lime-gray and its transitional facies. The morphology and distribution of manganese ore bodies are controlled by lithofacies assemblages and tectonic conditions. In this paper, the main quantity and trace element geochemistry of manganese bearing rock series are analyzed. The enrichment of redox sensitive elements such as V / (V Ni) V / (V Ni) V / (V / Ni) V / (Ni) O _ (2) O _ (2) O _ (2) in the study area shows that the manganese bearing rocks in the study area were formed in a weakly oxidized and oxygen-rich environment. In addition, the positive anomalies of Fe / Ti-Al / (Al Fe mn) Si / O 2 / Al 2O 3 + Ba / Sr and Co / Zn ratios and rare earth element EU in the mn bearing rock series show the characteristics of hot water sediments. In the diagram of Fe / Ti Al / (Al Fe mn) log U-log Th, (Ni Cu Co) 脳 10 -Fe-Mn relationship, the projection points of the samples are all located in the hot water deposition area. The results show that the enrichment and metallogenic process of manganese are closely related to the participation of hot water activities. The diagram of La / CeAl _ 2O _ 3 / (Al _ 2O _ 3) Fe _ 2O _ 3 / (Al _ 2O _ 3 / Sio _ 2) -100 脳 (Al _ 2O _ 3 / Sio _ 2) -Al _ 2O _ 3 / (100-SiO _ 2) Fe _ 2O _ 3 / (100-SiO _ 2) Fe _ 2O _ 3 / (Al _ 2O _ 3) Fe _ 2O _ 3 diagram and rare earth element characteristics indicate that the manganese bearing rocks were formed in the passive continental margin.
【作者单位】：中国冶金地质总局矿产资源研究院;中国冶金地质总局;成都理工大学;
【基金】：国家“十二五”科技支撑项目(编号:2011BAB04B10)资助
【分类号】：P618.32

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