|Table of Contents|

Geological Characteristics and Uranium Metallogenic Conditions of Middle Jurassic Yan'an Formation in the Northeastern of Ordos Basin, China(PDF)

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

Issue:
2020年第06期
Page:
833-848
Research Field:
非主题来稿
Publishing date:

Info

Title:
Geological Characteristics and Uranium Metallogenic Conditions of Middle Jurassic Yan'an Formation in the Northeastern of Ordos Basin, China
Author(s):
LI Rui-shuang1; 2;  LIU Zhan-qing1*;  YANG Sheng-fu2
1. College of Earth Sciences, Guilin University of Technology, Guilin 541004, Guangxi, China; 2. No.208 Geological Party, CNNC, Baotou 014010, Inner Mongolia, China
Keywords:
sandstone-type uranium deposit;  geological characteristic;  Yan'an Formation;  interlayer oxidation zone;  grey sandbody;  metallogenic condition;  Yimeng uplift;  Ordos Basin
PACS:
P619.14
DOI:
10.19814/j.jese.2020.08010
Abstract:
Ordos Basin is an important production area of sandstone-type uranium deposits in China. The ore-bearing rocks are mainly sandstones in the lower section of Middle Jurassic Zhiluo Formation. The lower part of Middle Jurassic Yan'an Formation has a low degree of research, and the prospecting results are not significant. A systematic analysis of sedimentary system, sandbodies, interlayer oxidation zones, rock mineralogy and uranium occurrence forms of Middle Jurassic Yan'an Formation was carried out in the northeastern of Ordos Basin. The results show that Yan'an Formation belongs to the river-delta sedimentary system, and can be divided into five rock members of Ⅰ, Ⅱ, Ⅲ, Ⅳ and Ⅴ from bottom to top. Among them, Ⅰ and Ⅴ rock members are channel sandbodies deposited by braided river facies and meandering river facies with large thickness, good permeability and connectivity, and are conducive to mineralization; interlayer oxidation zones are well developed in Ⅰ and Ⅴ rock members. Different levels of uranium mineralization exist near the front line of oxidation zone, which is dominated by particulate and short columnar coffinite. Uranium mineral sources, sandbodies, palaeoclimate, hydrogeology and other conditions comprehensively show that Middle Jurassic Yan'an Formation has the uranium metallogenic conditions, especially the gray sandbodies in the redox transition zone of Ⅰ and Ⅴ rock members have large mineralization potential.

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Last Update: 2020-12-20