Application of Automatic Mineral Analysis Technology to Identify Minerals and Occurrences of Elements in Sandstone-type Uranium Deposits in the Ordos Basin

ZHANG Ran; YE Li-juan; DANG Fei-peng; XIAO Zhi-bin; BI Jun-hui; ZHOU Jing; GUO Hu; XU Ya-wen; GENG Jian-zhen; ZHOU Hong-ying

doi:10.15898/j.cnki.11-2131/td.202005130071

Rock and Mineral Analysis > 2021 > 40(1): 61-73. > DOI: 10.15898/j.cnki.11-2131/td.202005130071

ZHANG Ran, YE Li-juan, DANG Fei-peng, XIAO Zhi-bin, BI Jun-hui, ZHOU Jing, GUO Hu, XU Ya-wen, GENG Jian-zhen, ZHOU Hong-ying. Application of Automatic Mineral Analysis Technology to Identify Minerals and Occurrences of Elements in Sandstone-type Uranium Deposits in the Ordos Basin[J]. Rock and Mineral Analysis, 2021, 40(1): 61-73. DOI: 10.15898/j.cnki.11-2131/td.202005130071

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Application of Automatic Mineral Analysis Technology to Identify Minerals and Occurrences of Elements in Sandstone-type Uranium Deposits in the Ordos Basin

1.
Tianjin Center of Geological Surve, China Geological Survey, Tianjin 300170, China
2.
Key Laboratory of Uranium Geology, China Geological Survey, Tianjin 300170, China
3.
No. 270 Research Institute of Nuclear Industry, Jiangxi 330200, China
4.
Henan Province Rock&Minerals Testing Center, Henan 450012, China

More Information

Received Date: May 12, 2020
Revised Date: July 02, 2020
Accepted Date: October 07, 2020
Published Date: January 27, 2021

Abstract

HIGHLIGHTS
(1) AMICS-SEM-EDS technology was used to find and identify uranium minerals, and to explore their occurrence, mineral composition and dissemination relationship.

(2) The uranium minerals in the Ordos Basin included coffinite, pitchblende, uraninite and uranophane. In the northern margin of the basin, uranium mineral was dominated by uranite, while in the western and the southern margin it was dominated by pitchblende.

(3) Uranium minerals were often closely associated with pyrite and occur in the margins or gaps among rutile, quartz, feldspar and other minerals.

ABSTRACT

BACKGROUND The Ordos Basin is one of the most important areas in China because it hosts lots of sandstone-type uranium deposits and a variety of other energy and mineral resources. The occurrence of uranium minerals is of great significance to the genetic understanding and prospecting of sandstone-type uranium deposits. However, the complex mineral composition, fine grain size, and various types and occurrences of uranium minerals make the initial identification stage of the study difficult. Currently, radiograph and electron probe microanalysis (EMPA) have played an important role in the identification of uranium minerals. Radiography can be used to obtain the position, occurrence and radioactive form of all uranium minerals in the light film at one time, but the mineral type cannot be identified. Moreover, it is a lengthy process and must be performed in darkness. Electron probe can be used to obtain the backscattered image of the uranium mineral. However, it takes time and effort to find uranium minerals with small content and small particle size in thin slices at high magnification, and it is impossible to quickly determine the types of associated minerals in BSE images.
OBJECTIVES To find a more rapid and accurate method for identifying uranium minerals.
METHODS The automatic mineral analysis system (AMICS), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) were used to identify minerals from sandstone-type uranium deposits in the north, south, and west margins of the Ordos Basin.
RESULTS The minerals in the study were identified as coffinite, pitchblende, uraninite and uranophane. Pyrite and titanium oxide were closely related to uranium minerals, and other associated minerals were identified as quartz, rutile, feldspar, mica and kaolinite.
CONCLUSIONS AMICS-SEM-EDS in situ analysis technology proves to be a reliable method for the rapid identification of uranium minerals, associated minerals, and their occurrences.

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Application of Automatic Mineral Analysis Technology to Identify Minerals and Occurrences of Elements in Sandstone-type Uranium Deposits in the Ordos Basin

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