Geomorphic Features and Its Constraint to Sandstone-hosted U Deposits Occurrence in Mid-Kezelkum, Uzbekistan

doi:10.19657/j.geoscience.1000-8527.2019.05.14

Abstract

Abstract:

The region of Mid-Kezelkum, located at the western of Tianshan orogenic belt in Central Asia, is a famous sandstone-hosted uranium metallogenic province in the world. In order to clean up the controls of the topographic and geomorphic conditions on both formation and conservation of sandstone-hosted U deposits. The elevation, slope, aspect, surface rolling, swath profile, and other kinds of geomorphic features are extracted from digital elevation model (DEM) data using geographic information system (GIS) technology, and geomorphic features with sandstone-hosted U deposits are quantified in this paper. The results show that the favorable landforms for sandstone-hosted U deposits are the elevation of 100 m, the slope of 0°-5°, the topographic relief of 10-35 m, and the sub-basin hypsometric integral (HI) of 0.3-0.6. There are 4 clear planation surfaces in Mid-Kezelkum, and the elevation are 2 200 m (I), 1 600 m (II), 1 100 m (III), and 330-400 m (IV), respectively. The sandstone-hosted U deposits were developed near the IV planation surface. By analyzing the correlation of different geomorphic factors, the sandstone-hosted U deposits are concentrated in the low-altitude and low-relief regions. Both of which can be used as the main factors for prediction of prospecting for sandstone-hosted U deposits. In addition, the favorable sandstone-hosted U deposit areas are delineated by means of spatial analysis and geomorphic features which provide the basis for further prospecting in Mid-Kezelkum.

Key words: Mid-Kezelkum, DEM, geomorphic features, sandstone-hosted U deposit, GIS

CLC Number:

P627
P619.14

SUN Yue, PAN Jiayong, CHEN Zhengle, HAN Fengbin, LIU Wenheng, XIAO Weifeng. Geomorphic Features and Its Constraint to Sandstone-hosted U Deposits Occurrence in Mid-Kezelkum, Uzbekistan[J]. Geoscience, 2019, 33(05): 1070-1078.

Figures/Tables 17

Fig.1 The DEM and uranium deposits distribution map of the study area

Table 1 The elevation statistic value of the Mid-Kezelkum area

高程/m	百分比/%	累积百分比/%
<500	67.84	67.84
500~1 000	24.66	92.50
1 000~1 500	4.88	97.38
1 500~2 000	1.92	99.30
2 000~2 500	0.60	99.90
2 500~3 000	0.07	99.97
3 000~3 500	0.02	99.99
>3 500	0.01	100

Table 2 The elevation statistic value of the uranium deposits

铀矿点	最大高程/m	最小高程/m	平均值/m	标准差/m
	637	129	343	147.4

Fig.2 The elevation distribution histogram of the sandstone-hosted U deposits

Fig.3 Four types of DEM maps of the study area

Fig.4 The topographic relief distribution histogram of the sandstone-hosted U deposits

Fig.5 The slope map of the Mid-Kezelkum area

Table 3 The slope statistic value of the Mid-Kezelkum area

坡度划分	百分比/%	累计百分比/%
平坦坡<5°	83.84	83.84
缓坡5°~15°	11.35	95.19
斜坡15°~25°	3.17	98.36
陡坡25°~35°	1.29	99.65
急坡35°~45°	0.29	99.94
险坡>45°	0.06	100

Fig.6 The gradient distribution histogram of the sandstone-hosted U deposits

Table 4 The aspect statistic value of the sandstone-hosted U deposits

铀矿点	最小坡向/(°)	最大坡向/(°)	平均值/(°)	标准差/(°)
	6.34	306.25	195.88	97.33

Fig.7 The aspect distribution histogram of the sandstone-hosted U deposits

Table 5 The hypsometric integral (HI) statistic value of the sub-basins and sandstone-hosted U deposits

地点	最小值	最大值	平均值	标准差
亚流域	0.009	0.874	0.414	0.117
铀矿点	0.315	0.677	0.441	0.094

Fig.8 The hypsometric integral (HI) distribution histogram of the sub-basins and sandstone-hosted U deposits

Fig.9 The graphs of the a, b and c swath profiles in the Mid-Kezelkum

Table 6 The terrain factor correlation coefficient

	高程	坡度	坡向	地形起伏度	面积-高程积分
高程	1
坡度	0.112 053	1
坡向	0.544 539	0.205 519	1
地形起伏度	0.723 929	0.281 929	0.471 725	1
面积-高程积分	-0.211 66	-0.284 03	-0.452 61	-0.165 63	1

Fig.10 The relation diagram of the topographic relief and elevation

Fig.11 The ore prospective area of sandstone-hosted U depo-sit in Mid-Kezelkum

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