Analysis on Uranium Metallogenic Geological Conditions and Prospecting Prospects in Naren Area, Erlian Basin

doi:10.19657/j.geoscience.1000-8527.2022.02.27

Abstract

Abstract:

Although uranium mineralization information has been found in the upper member of Saihan Formation in Naren area through regional evaluation in recent years, the analysis of uranium mineralization conditions and prospective prediction are obviously inadequate due to the low level of work. In this paper, the uranium source, structure, stratum, sedimentary facies, oxidation-reduction and paleoclimate conditions in Naren area are comprehensively analyzed based on the comprehensive arrangement of borehole and seismic data, combined with systematic sampling, analysis and testing results. The authors believe that uranium source is sufficient in this area, and a large amount of uranium was activated and migrated in the erosion source area during the warm sub-humid to dry hot climate transition period. The Late Cretaceous-Cenozoic tectonic activity provided the slope zone suitable for the development of oxidation zone and the upward passage of deep reducing fluid. The first sub-member of the upper Saihan Formation has braided river delta sandbodies with large scale, stable mud-sand-mud structure and favorable oxidation-reduction conditions, which are ideal space for uranium ore formation. In the best position of uranium mineralization condition, there is one prospective area of grade Ⅰ, which is expected to be implemented as a new uranium deposit.

Key words: Erlian Basin, Naren area, uranium metallogenic geological conditions, the first sub-member of the upper Saihan Formation, prospective area

CLC Number:

P619.14

L&xdc; Yonghua, MIAO Aisheng, WANG Guo, LI Shuguang, GAO Zhengrong. Analysis on Uranium Metallogenic Geological Conditions and Prospecting Prospects in Naren Area, Erlian Basin[J]. Geoscience, 2022, 36(02): 662-671.

Figures/Tables 11

Fig.1 Sketch map of tectonic division of Manite depression

Table 1 Calculation results of uranium content in rocks around the study area

地层、岩石	现测铀量/10^-6	原始铀量/10^-6	活化丢失/%	U_i/U_c	Th/U
流纹质凝灰岩(J₃b)	3.28	48.4	-93	13.8	12.9
流纹质凝灰岩(C₂bl)	2.88	17.04	-83	4.9	5.8
华力西期花岗岩类	1.08~3.47	10.2	-80	2.9	3.3
燕山期花岗岩类	0.7~1.3	16.3	-92	4.7	5.5

Fig.2 Seismic stratigraphic interpretation graph of D0501 profile in Naren area

Fig.3 Diagram of stratigraphic structure in Naren area

Fig.4 Comprehensive results of particle size parameters of the first sub-member of the upper Saihan Formation in Narene area

Fig.5 Sedimentary facies map of the first sub-member of the upper Saihan Formation in Naren area

Fig.6 Petrogeochemical map of the first sub-member of the upper Saihan Formation in Naren area

Table 2 The statistical results of non-ore rock geochemical indexes in the study area

岩性	样品数/个	Fe₂O₃/%	FeO/%	Fe³⁺/Fe²⁺	S^2-/%	S_全/%	C_有/%	ΔEh/mV	U/10^-6	Th/10^-6
灰白色砂岩	74	1.41	0.64	1.98	0.25	0.15	0.15	24.92	2.04	16.91
黄色砂岩	71	1.98	0.88	2.03	0.14	0.07	0.14	18.59	0.18	8.84
灰色砂岩	292	0.72	1.79	0.36	0.61	0.74	0.45	42.64	15.00	23.87
灰绿色砂岩	77	0.61	0.82	0.67	0.40	0.14	0.21	32.02	8.10	22.00

Fig.7 Profile of L1 line in Naren area

Fig.8 Variation trend of mineral content in sediments of Lower Cretaceous-Paleogene

Fig.9 Comprehensive prospecting prospects of Naren area

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