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- Title
沙特赛尼亚特含铀磷块岩矿床区域地质背景及 对磷-铀的制约作用.
- Authors
李治兴; 秦明宽; 范洪海; 蔡煜琦; 衣龙升; 张云龙; 李国臣; 张康; 郭帮杰
- Abstract
The phorsphorite reserves of Thaniyat area in Saudi Arabia of Neo-Tethys phosphorite metallogenic domain take about 82. 7% the world 's land reserves of phosphate rock. However, study on the metallogenic geological background for such large-scale accumulation of phosphate rock is quite weak. This paper summarized the global phosphorite metallogenic domain and phosphorite forming time were systematically analyzed, and the paleogeographic environment, regional sedimentary-tectonic evolution and geological characteristics of the Thaniyat area in northern Saudi Arabia. The results showed that the phosphorites were distributed in five major metallogenic domains, and the global important industrial phosphorite deposits were formed mainly in eight phosphogenic periods, and the most important three are the Late Sinian-Early Cambrian, Permian and Late Cretaceous-Paleogene. Thaniyat area is located in the southwest of Sirhan Turayf basin, the eastern Mediterranean metallogenic province of Neo-Tethys phosphorite metallogenic domain and composed part of the major Late Cretaceous-Palaeogene phosphorus events. During the Paleozoic, much of the Arabian Peninsula was part of the Paleo-Tethys margin, where extensive sequences of siliceous clastic rock were deposited, virtually no phosphorites, but only thin-bedded carbonates. During the Early Cretaceous (to Early Albian), the eastern Mediterranean was almost completely exposed and the sedimentation was dominated by fluvial clastic deposits. From the Late Cretaceous Turonian to Eocene, after the oceanic front of the Afro Arabian plate collided with the subduction trench of the Eurasian plate, the Neo-Tethys Ocean closed, which controlled the formation of phosphorite deposits in time, space and genesis. The Neo Tethys began its transgression during the Late Cretaceous Zaluma Stage, and was in the transgressive stage during the Turayf Stage until the end of the Paleocene. The Jalamid Formation, the Mira Formation and the Umm Wu'al Formation were formed from bottom to top in northern Saudi Arabia. The distribution characteristics of their gradually retreat to the center of the basin indicated that the scale of transgression was gradually weakening. The Thaniyat phosphorite member and the Ghinah phosphorite member are mainly developed in the Thaniyat area. The special paleogeographic environment and regional sedimentary-tectonic evolution are the main reasons for the large-scale accumulation of uranium-bearing phosphorite in the Thaniyat area, and the marine transgression event is the inducement for the deposition of uranium-bearing phosphorite in the Thaniyat area.
- Subjects
SAUDI Arabia; ARABIAN Peninsula; PHOSPHATE rock; MARINE transgression; METALLOGENIC provinces; SILICEOUS rocks; CLASTIC rocks; METALLOGENY
- Publication
World Nuclear Geoscience, 2022, Vol 39, Issue 4, p685
- ISSN
1672-0636
- Publication type
Article
- DOI
10.3969/j.issn.1672-0636.2022.04.006