新疆蒙其古尔砂岩型铀矿床含矿目的层中黄铁矿类型与铀成矿关系初析
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1.青海省青藏高原北部地质过程与矿产资源重点实验室;2.青海省地质调查院;3.青海煤炭地质勘探队;4.青海省水文地质工程地质环境地质调查院;5.东华理工大学核资源与环境国家重点实验室

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中图分类号:

P612

基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)


The Study on Pyrite in Ore Target Layer of Mongqigur Sandstone-type Uranium Deposit, Xinjiang
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Affiliation:

Qinghai Province Key Laboratory of Geological Process and Mineral Resources of Northern Qinghai-Tibet Plateau, Qinghai Geological Survey Institute, Xining

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    黄铁矿是砂岩型铀矿床中常见的载铀矿物之一,可为成矿提供有利的还原环境。本文以新疆蒙其古尔砂岩型铀矿床含矿目的层中黄铁矿为研究对象,通过偏光显微镜观察与电子探针微区化学成分分析方法相结合进行研究。结果表明:区内含矿目的层中出露有三种不同形态的黄铁矿,即草莓状黄铁矿、立方体自形晶黄铁矿和不规则状黄铁矿,它们在结晶形态、赋存形式及化学成分方面均有所不同;其硫铁平均比值显示为S/Fe(草莓状黄铁矿)<S/Fe(立方体自形晶黄铁矿)<S/Fe(不规则状黄铁矿),化学成分总体呈现出富Mo、As、Co贫Ni、Pb、Se、Zn、Ag、Sb。另外在铀成矿过程中,不规则状黄铁矿与铀矿物的分布存在密切关系,为成矿流体提供了必要的还原剂,继而为区内含矿目的层中铀的富集提供了有利条件。

    Abstract:

    Pyrite is one of the most common uranium-bearing minerals in sandstone-type uranium deposits, which can provide favorable reduction environment for mineralization. In this paper, the pyrite in the ore target layer of the Mongqigur sandstone-type uranium deposit in Xinjiang is taken as the research object, and polarization microscope and EPMA were used to study the chemical composition. The results show that there are three different forms of pyrite in the ore target layer, namely strawberry pyrite, cubic euhedral crystal pyrite and irregular pyrite, which are different in crystal morphology, occurrence form and chemical composition. The average ratio of sulphur to iron is S/Fe (strawberry pyrite) < S/Fe (cubic euhedral crystal pyrite) < S/Fe (irregular pyrite). The chemical composition is rich in Mo, As, Co and poor in Ni, Pb, Se, Zn, Ag and Sb. In addition, in the process of uranium mineralization, irregular pyrite is closely related to the distribution of uranium minerals, which provides the necessary reducing agent for ore-forming fluids, and then provides favorable conditions for uranium enrichment in ore target layer in the area.

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引用本文

黄广文,黄广楠,何钟强,等. 新疆蒙其古尔砂岩型铀矿床含矿目的层中黄铁矿类型与铀成矿关系初析[J]. 科学技术与工程, 2019, 19(33): 68-75.
Huang Guang Wen,, and. The Study on Pyrite in Ore Target Layer of Mongqigur Sandstone-type Uranium Deposit, Xinjiang[J]. Science Technology and Engineering,2019,19(33):68-75.

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  • 收稿日期:2019-03-13
  • 最后修改日期:2019-08-16
  • 录用日期:2019-07-02
  • 在线发布日期: 2019-12-06
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