Paleogroundwater Dynamics of Xishanyao Formation in Kuosijiaer Uranium Ore District in Yili Basin

doi:10.19657/j.geoscience.1000-8527.2019.02.18

Abstract

Abstract:

This study investigated the paleogroundwater dynamic system of the Xishanyao Formation in Kuosijiaer area (Yili Basin), summarized its relationship with the uranium mineralization, and provided supports for the metallogenic regularities of sandstone-type uranium deposits and guide for future uranium prospecting in the area. By analyzing the thickness variation characteristics of the oxidized sand bodies, inverting the planar flow regime of interlayer oxidizing fluids, we reconstructed the paleogroundwater recharge-runoff-discharge characteristics of the Xishanyao Formation in the study area. Interlayer oxidized zone at Kuosijiaer was mainly developed in the Lower Xishanyao Formation and upper sub-member of the Upper Xishanyao Formation. The maximum thickness of the oxidized sand body of the Lower Xishanyao Formation occurs in the southwest, and appears as flower-shaped in the northeast and north. Maximum thickness of the oxidized sand body of the upper sub-member of the Upper Xishanyao Formation is in the southeast, and appears as strip-shaped in the northwest. Based on the distribution characteristics of the oxidized sand bodies, and considering the sand body thickness changes and the regional hydrogeological regime, two water-replenishment directions in the uranium mineralization can be determined at Kuosijiaer: (1) southwest, same in both the Lower and Upper Xishanyao Formations; (2) southeast, which was likely the main water-replenishment direction in the Upper Xishanyao Formation.

Key words: Yili Basin, Kuosijiaer area, Xishanyao Formation, paleogroundwater dynamics, sandstone-type uranium deposit

CLC Number:

P611
P169.14

QIU Yubo, CHEN Hong, YANG Junfeng, ZHANG Zhanfeng, JIANG Hong, DU Mo, LI Gang. Paleogroundwater Dynamics of Xishanyao Formation in Kuosijiaer Uranium Ore District in Yili Basin[J]. Geoscience, 2019, 33(02): 431-439.

Figures/Tables 7

Fig.1 Tectonic division and location of the Kuosijiaer area in the Yili Basin

Fig.2 Synthetic column diagram of the Xishanyao Formation in the Kuosijiaer area

Fig.3 Contour map of sand body thickness of the Lower Xishanyao Formation, Kuosijiaer area

Fig.4 Contour map of sand body thickness of the Upper Xishanyao Formation, Kuosijiaer area

Fig.5 Relationship between the oxidized sand body thickness and the U-bearing oxidized groundwater seepage flow in the Lower Xishanyao Formation, Kuosijiaer area

Fig.6 Relationship between the oxidized sand body thickness and the U-bearing oxidized groundwater seepage flow in the Upper Xishanyao Formation, Kuosijiaer area

Fig.7 Altitude contour lines of M10 hanging wall and the U-bearing oxidized groundwater seepage flow in the Xishanyao Formation, Kuosijiaer area

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