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Characteristics of Clay Minerals in the Ore-bearing Sandstones of the Lower Member of Huanhe Formation in Xinzhuang Area of Ordos Basin, China and Their Significance for Uranium Mineralization(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2025年第05期
Page:
901-911
Research Field:
基础地质与矿床地质
Publishing date:

Info

Title:
Characteristics of Clay Minerals in the Ore-bearing Sandstones of the Lower Member of Huanhe Formation in Xinzhuang Area of Ordos Basin, China and Their Significance for Uranium Mineralization
Author(s):
ZHANG Liang1*;  WU Zheng-qian1;  LIU Kun-peng1;  WANG Xiao-peng1;  WEI Zheng-yu2; PEI Liu-ning1;  MAO Ning1;  WANG Qi-hui1;  FENG Bo1
(1. No.203 Research Institute of Nuclear Industry, Xi'an 710086, Shaanxi, China; 2. Geological Exploration Institute of Shandong Zhengyuan, Jinan 250101, Shandong, China)
Keywords:
petrology;  geochemistry;  clay mineral;  sandstone-type uranium deposit;  Huanhe Formation;  Lower Cretaceous;  Ordos Basin
PACS:
P57; P619.14
DOI:
10.19814/j.jese.2024.08031
Abstract:
The Xinzhuang ore deposit is located in the southwestern of Ordos Basin, and is a large sandstone-type uranium deposit discovered in the southern part of the basin in recent years. The ore-bearing horizon is the lower member of Lower Cretaceous Huanhe Formation. Currently, the research has mainly focused on the aspects such as mineralization environment, ore characteristics, and controlling factors of ore formation, but a systematic study on clay minerals in ore-bearing sandstone has not yet been conducted. Based on regional geological compilation, rock samples were systematically collected according to oxidation intensity in a sequence of strong(red sandstone), weak(yellow sandstone), transitional(gray ore-bearing sandstone)and reduced(primary gray sandstone), and were measured by microscopic identification, scanning electron microscopy, and X-ray diffraction analyses. The results show that the total content of clay minerals in the lower segment sandstone of Huanhe Formation in Xinzhuang area is low(ranging from 0.8% to 1.7% with an average of 1.1%); the composition of clay minerals in sandstone of different zones is basically consistent, mainly including illite, followed by chlorite, and a small amount of illite/smectite mixed-layer minerals; the relative content of chlorite and illite/smectite mixed-layer minerals gradually increases, while that of illite decreases in a sequence of red sandstone, yellow sandstone, gray ore-bearing sandstone and primary gray sandstone; there is a significant negative correlation between the relative contents of illite and chlorite, as well as illite/smectite mixed-layer minerals; during the process of uranium enrichment and mineralization, clay minerals can adsorb part of the uranium, but they are not the primary cause of uranium enrichment and mineralization; the transformation of illite into chlorite and illite/smectite mixed-layer minerals represents the process of alkaline to weakly alkaline fluid action, without abrupt environmental changes; additionally, influenced by reducing media and low clay mineral content, the intensity of mineralization may be low, potentially leading to a tabular uranium orebody with overall low grade, large thickness, and long dip extension.

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Last Update: 2025-10-01