Citation: | Reng-an Yu, Shan-bo Wang, Qiang Zhu, Qing-hong Si, Xue-ming Teng, Xiao-xue Liu, Hou-ning Liu, Yong-xiang Tang, 2021. Zircon U-Pb ages and provenance characteristics of the Zhiluo Formation sandstones and the formation background of the uranium deposit in Huangling area, Ordos Basin, China, China Geology, 4, 600-615. doi: 10.31035/cg2021006 |
The newly discovered medium-scale Huangling uranium deposit is located in the Shuanlong area of the southeast Ordos Basin. This paper presents the systematic geochemical and zircon U-Pb studies on the Zhiluo Formation sandstones in the Huanling area. The data obtained play an important role in deducing the provenance and tectonic setting of the source rocks. The results show that the lower part of the Zhiluo Formation is mainly composed of felsic sedimentary rocks. The source rocks originated from a continental island arc environment in terms of tectonic setting. U-Pb ages of detrital zircons obtained can be roughly divided into three groups: 170‒500 Ma, 1600‒2050 Ma, and 2100‒2650 Ma. Based on the characteristics of trace elements and rare earth elements (REE) and the zircon U-Pb dating results, it is considered that the Cryptozoic Edo provenance of the Zhiluo Formation mainly includes magmatic rocks (such as granodioritic intrusions) and metamorphic rocks (such as gneiss and granulite) in the orogenic belts on the northern margin of the North China Plate and in the Alxa Block. Based on sedimentological and petrological results, it can be concluded that the provenance of clastic sediments in the Zhiluo Formation was in north-south direction. The preconcentration of uranium is relatively low in the Lower Zhiluo Formation in the Huangling area. Meanwhile, the paleocurrent system in the sedimentary period is inconsistent with the ore-bearing flow field in the mineralization period, which restricts the formation of large-scale and super-large-scale uranium deposits and ore zones in the southeast Ordos Basin. The understanding of provenance directions will provide crucial references for the Jurassic prototype recovery and paleo-geomorphology of the Ordos Basin and the prediction of potential uranium reservoirs of the basin.
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Simplified geological and tectonic map of the Ordos Basin and its adjacent regions.
Petrographic characteristics of the Zhiluo Formation in the Huangling area. a‒comprehensive borehole histogram; b‒macro-characteristics of cores drilled in the study area; c‒hand specimen of the Zhiluo Formation sandstones; d‒photomicrographs of the Zhiluo Formation sandstones. Qrt‒Quartz; Pl‒Plagioclase; Kp‒Feldspar; Bit‒biotite; Ser‒Sericite.
MORB-normalized trace element patterns of the Zhiluo Formation sandstones in the Huangling area (a; after Pearce JA, 1984) and chondrite-normalized REE diagrams (b; after Boynton WV, 1984).
CL images and LA-ICP MS zircon U-Pb concordia diagrams of Zhiluo Formation sandstones in the Huangling area. a‒ZK2018.01.1 CL images; b‒ZK2018.01.1 U-Pb concordia diagram; c‒ZK2018.01.5 CL image; d‒ZK2018.01.5 U-Pb concordia diagram; the units of age are Ma in a and c.
Relationship of zircon ages and Th/U ratios of detrital zircons from the Zhiluo Formation sandstones in the Huangling area.
Distribution histograms of detrital zircon ages of the Zhiluo Formation sandstones in the Huangling area.
Discrimination diagram of provenances F1-F2 (a) and La/Th-Hf diagram (b) of the Zhiluo Formation sandstones in the Huangling area.
Tectonic setting discriminant diagram of major elemental composition of the Zhiluo Formation sandstones in the Huangling area.
Tectonic setting discrimination plots for Th-Sc-Zr/10 and La-Th-Sc of the Zhiluo Formation sandstones in the Huangling area.
Contour map of the sand thickness of the lower member of the Zhiluo Formation in southern Ordos Basin.
Comparison between the detrital zircon ages of the Zhiluo Formation sandstones in the Huangling area and the isotopic ages of rocks around the Ordos Basin (n denotes the age number; data in subfigs. b–i after Lei KY et al., 2017).
Evolution model of the tectonics, provenances, and paleogeography of the Zhiluo Formation in the Huangling area.