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- Title
宁夏固原凹陷岩盐矿床后生改造成矿 作用—来自矿物学的证据.
- Authors
刘芳; 田景雄; 何伟; 褚小东; 宋新华
- Abstract
In order to better understand the composite mineralization of rock salt deposits, this work conducted field investigations, microscopic observations, SEM analysis, energy spectra analysis, X-ray powder diffraction analysis of the Guyuan rock salt deposits in Ningxia Province to reveal the metallogenic rules and model. Combined with petrology and mineralogy, the ore textures and structures were studied, and the mineralization period was divided. Results show that the Guyuan rock salt ores are featured by primary sedimentation and epigenetic reformation. The euhedral fine crystalline texture is primary sedimentary texture, and the euhedral coarse crystalline, embayed and wormy metasomatic textures are typical of epigenetic reformation. The layered, stripped and lumpy structures are primary sedimentary structures, while massive, brecciated and net-veined structures are epigenetic reforming structures. Mineral assemblages of rock salt deposits mainly include halite, glauberite, anhydrite, anhydrate glauberite, clay minerals, albite and dolomite, characterized by primary sedimentation and epigenetic reformation. Primary sedimentary type and epigenetic reforming type minerals can be observed in salt minerals. Petrographic and mineralogical studies have confirmed the Guyuan rock salt deposits to be typical of primary sedimentary-metamorphic reformation. The mineralization of glauberite and anhydrite was mainly formed by early sedimentation and experienced weak reformation in the later stage, while the rock salt deposit was mainly formed by early sedimentation. In the later period, plastic flow, dissolution-recrystallization or tectonic deformation occurred and filled in the favorable space formed by the fracture or tectonic activity of the surrounding rock. The deposits have experienced two metallogenic periods, i.e., primary sedimentary mineralization and epigenetic reforming mineralization.
- Publication
Geology & Exploration, 2023, Vol 59, Issue 1, p27
- ISSN
0495-5331
- Publication type
Article
- DOI
10.12134/j.dzykt.2023.01.003