Theoretical System of Sandstone-Type Uranium Deposits in Northern China

• 作者: Ruoshi Jin Huajian Liu Xiaoguang Li
• 来源期刊: 地球科学学刊（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: Special Issue on Sandstone-Type Uranium Mineralization and Its Metallogenic Background
• 页码范围: 257-277
• 页数: 21页
• 语种: 英文

摘要

Many theoretical results on sandstone-type uranium mineralization in northern China obtained by the uranium research team of the Tianjin Center of Geological Survey in recent years are presented. From the source sink system of uranium-producing basins, sedimentary environment of uranium-bearing rock series, ore-forming fluid information, evolution of tectonic events, basin forma-tion and development, we redefine and classify uranium orebodies, redox zoning, and ore-controlling structural styles. We then systematically propose a theoretical system of sandstone-type uranium depos-its in northern China. We conclude that sandstone-type uranium deposits in northern China are main-ly found in sedimentary environments such as rivers, deltas, and alluvial fans in the Mesozoic and Ce-nozoic lowstand systems tract and in gray sandstone layers in the vertical redox zoning. The orebodies are controlled by the tectonic slope belt, which is in the shape of a strip on the plane, and spreads in a layer or plate on the section. Vertical (ups and downs) tectonic movement triggers large-scale phreatic flow in the basin, which is the real driving force for controlling the ore-forming fluid. The theoretical system of sandstone-type uranium deposits in northern China should be based on global tectonic move-ment and environmental changes and take into account factors such as basins as a unit to study miner-alization background, ore concentration areas as objects to study mineralization, and the correlation between regional tectonic movement and metallogenic process as a breakthrough point to study tecton-ic events and metallogenic events. It should also be based on different basin types to establish metallo-genic models. The innovative research results and ideas are summarized with the aim of promoting the continuous improvement of sandstone-type uranium mineralization theory in northern China.