3种典型富锰沉积物的形貌学与矿物学特征
发布时间：2019-02-17 12:20
【摘要】：本文采集了3种典型的富锰沉积物样品,即岩石漆、树枝晶与土壤铁锰胶膜,并制作了相应的纵切片。运用光学显微镜、原位微区拉曼光谱仪、扫描电镜、EDX能谱仪分别对其形貌学与矿物学特征进行了研究。结果表明岩石漆呈黑色致密层状、葡萄状,主要由水钠锰矿、赤铁矿、针铁矿、粘土矿物等组成,是一种高度混杂的沉积物。宏观上岩石漆与基岩有截然的接触面,发育有微层理结构,在微观上的表现即锰含量的周期性波动。树枝晶呈黑色分枝状,主要由锰钡矿组成,极端富锰而贫硅铝,与基质呈交织结构。土壤铁锰胶膜呈黑色粘稠层状,由水钠锰矿、赤铁矿、针铁矿、钛铁矿、粘土矿物等组成,可细分为外层黑褐色的富锰条带和内层黄棕色的富铁条带。这3种富锰沉积物的形貌学和元素分布特征与各自的成因机制密切相关。
[Abstract]:In this paper, three typical samples of manganese rich sediments, that is, rock lacquer, dendrite and soil iron manganese film, were collected, and the corresponding longitudinal sections were made. The morphologies and mineralogical characteristics were studied by optical microscope, in situ Raman spectrometer, scanning electron microscope and EDX energy spectrometer. The results show that rock lacquer is a highly mixed deposit, which is composed of sodium manganese ore, hematite, goethite, clay minerals and so on. Macroscopically, the rock lacquer has a direct contact with the bedrock and has a microstratified structure. The microcosmic performance is the periodic fluctuation of manganese content. Dendrite is black branched, mainly composed of barium manganese ore, extremely rich in manganese and poor in silicon and aluminum, and intertwined with the matrix. The soil iron-manganese film is composed of sodium manganite, hematite, goethite, ilmenite and clay minerals, and can be subdivided into black brown rich manganese strip and inner yellowish brown rich iron strip. The morphology and element distribution of the three manganese rich sediments are closely related to their genetic mechanisms.
【作者单位】： 造山带与地壳演化教育部重点实验室矿物环境功能北京市重点实验室北京大学地球与空间科学学院;
【基金】：国家自然科学基金重点项目(41230103) 国家重点基础研究“973”发展计划(2014CB846001)~~
【分类号】：P588.243
本文编号：2425157
[Abstract]:In this paper, three typical samples of manganese rich sediments, that is, rock lacquer, dendrite and soil iron manganese film, were collected, and the corresponding longitudinal sections were made. The morphologies and mineralogical characteristics were studied by optical microscope, in situ Raman spectrometer, scanning electron microscope and EDX energy spectrometer. The results show that rock lacquer is a highly mixed deposit, which is composed of sodium manganese ore, hematite, goethite, clay minerals and so on. Macroscopically, the rock lacquer has a direct contact with the bedrock and has a microstratified structure. The microcosmic performance is the periodic fluctuation of manganese content. Dendrite is black branched, mainly composed of barium manganese ore, extremely rich in manganese and poor in silicon and aluminum, and intertwined with the matrix. The soil iron-manganese film is composed of sodium manganite, hematite, goethite, ilmenite and clay minerals, and can be subdivided into black brown rich manganese strip and inner yellowish brown rich iron strip. The morphology and element distribution of the three manganese rich sediments are closely related to their genetic mechanisms.
【作者单位】： 造山带与地壳演化教育部重点实验室矿物环境功能北京市重点实验室北京大学地球与空间科学学院;
【基金】：国家自然科学基金重点项目(41230103) 国家重点基础研究“973”发展计划(2014CB846001)~~
【分类号】：P588.243
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