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- Title
沙特赛尼亚特矿床赛尼亚特磷块岩段地质 特征和层序地层分析.
- Authors
李治兴; 李子颖; 秦明宽; 王鹏; 范洪海; 蔡煜琦; 衣龙升; 张云龙; 李国臣; 张康; 郭邦杰
- Abstract
The Thaniyat deposit in Saudi Arabia is an important part of the Neo-Tethys phosphorite metallogenic domain, which is rich in phosphorus and uranium-bearing phosphorite resources. However, the research on the Thaniyat deposit is quitely weak. In this paper, based on comprehensive analysis of previous work, geological and radiological survey of the Thaniyat deposit and its surrounding areas were carried out, field measurement, mineralogical study, sedimentary environment and sequence stratigraphic analysis of the Thaniyat phosphorite were conducted. The results showed that the chert bed in the middle of the Thaniyat deposit was a marker bed for the development of uranium-bearing phosphorite in the area. The Thaniyat phosphorite member was divided into upper and lower phosphorite beds. From the bottom to the top of the Thaniyat phosphorite member, and the individual phosphorite beds are characterized by a gradual decrease of sandy components and the increase of calcareous components. The texture and structures of the phosphorite indicate that it is a sediment formed by long-distance transportation. The enrichment of uranium is closely related to the phosphorite. Sequence stratigraphic analysis showed that the southeastward transgression occurred in the region during the Turayf Group of the Cretaceous, which provided the driving force for the formation of retransported sedimentary phosphorites in the study area. the Thaniyat phosphorite was the product of marine transgression. Phosphorites represent transgressive system tracts in sequence stratigraphy, and phosphorites reach the maximum transgressive surface at the end of phosphorites sedimentation. The mudstone and chert in the middle of the Thaniyat phosphorite member and the top chert layer are the products of highest and system tract. At the same time, each layer of the phosphorite represents a process of transgression, the multiple layers of phosphorite showed that the process of transgression has undergone several times. The established sequence cycle and dynamic model of phosphorite are of great significance to the prediction of uranium-bearing phosphorite uranium resources.
- Publication
Uranium Geology, 2023, Vol 39, Issue 2, p265
- ISSN
1000-0658
- Publication type
Article
- DOI
10.3969/j.issn.1000-0658.2023.39.023