LA-ICP-MS In-Situ U-Pb Ages of Uraninite from the Dafuling Uranium Deposit, Eastern Hunan, and Its Implications for Ore Genesis

doi:10.19657/j.geoscience.1000-8527.2024.028

Abstract

Abstract:

The Dafuling Uranium Deposit is part of the Mingyuefeng Ore Field in eastern Hunan, and it represents a newly proven perigranitic uranium deposit within this ore concentration area. Recent prospecting and exploration practices have shown that the deposit exhibits significant uranium mineralization scale and considerable prospecting potential. However, due to the insufficient analysis of the characteristics of uranium minerals in this deposit and the weak constraints on the timing of uranium mineralization, the understanding of the ore deposit’s genesis has been somewhat hindered. Against this backdrop, this study conducted detailed field geological surveys, collected representative uranium ore samples, and employed laboratory ore-mineral identification, scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and LA-ICP-MS, among other analytical techniques. For the first time, it deciphered the characteristics of uranium minerals in the deposit and constrained their metallogenic age. The results indicate that the exposed uranium mineral in the deposit is mainly uraninite, with a uranium metallogenic age of approximately 70 Ma, corresponding to the late Cretaceous. Combined with the tectonic setting, it is preliminarily considered that the mineralization is closely related to the Mesozoic (75-70 Ma) lithospheric extension and thinning event in South China, indirectly indicating that the Dafuling Uranium Deposit might have formed in a tectonodynamic setting of lithospheric extension and thinning.

Key words: uraninite, LA-ICP-MS, uranium age, Dafuling deposit, Mingyuefeng ore field

CLC Number:

P611

FAN Pengfei, SHEN Xikun, HUANG Guangwen, LI Mangen, GU Yong, WANG Ke, LIU Tao, GUO Yeda. LA-ICP-MS In-Situ U-Pb Ages of Uraninite from the Dafuling Uranium Deposit, Eastern Hunan, and Its Implications for Ore Genesis[J]. Geoscience, 2025, 39(04): 920-930.

Figures/Tables 7

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序号	TiO₂	CaO	Yb₂O₃	ThO₂	Y₂O₃	SiO₂	Al₂O₃	UO₂	PbO	Ce₂O₃	La₂O₃	P₂O₅	Na₂O	MgO	K₂O	Total
1	-	4.050	-	-	0.062	0.161	0.010	90.435	0.609	0.189	-	0.018	0.038	0.001	-	95.573
2	0.089	4.466	-	-	0.045	0.258	0.007	87.869	0.480	0.122	0.086	0.046	0.031	-	-	93.499
3	0.004	4.477	-	-	-	0.336	-	86.467	0.477	0.092	-	0.050	0.087	-	-	91.990
4	0.026	5.616	0.079	-	-	0.198	-	85.333	1.053	0.109	0.022	0.155	0.060	-	-	92.651
5	-	5.152	-	-	0.122	0.339	0.010	86.325	0.566	0.106	-	0.052	0.087	-	-	92.759
6	0.048	4.175	0.064	-	-	0.215	0.014	89.177	0.578	-	0.053	0.050	0.051	-	-	94.425
7	-	5.022	0.120	-	-	0.551	0.004	86.289	0.356	0.029	-	0.061	0.050	-	-	92.482
8	-	3.798	-	-	0.099	0.001	-	86.103	1.370	0.172	-	0.068	0.125	-	-	91.736
9	-	5.264	-	-	0.022	0.415	-	85.188	0.979	0.065	-	0.156	0.131	-	0.001	92.221
10	-	5.537	-	-	-	0.244	0.019	84.327	0.926	0.097	0.028	0.193	0.126	-	0.001	91.498

序号	TiO₂	CaO	Yb₂O₃	ThO₂	Y₂O₃	SiO₂	Al₂O₃	UO₂	PbO	Ce₂O₃	La₂O₃	P₂O₅	Na₂O	MgO	K₂O	Total
1	-	4.050	-	-	0.062	0.161	0.010	90.435	0.609	0.189	-	0.018	0.038	0.001	-	95.573
2	0.089	4.466	-	-	0.045	0.258	0.007	87.869	0.480	0.122	0.086	0.046	0.031	-	-	93.499
3	0.004	4.477	-	-	-	0.336	-	86.467	0.477	0.092	-	0.050	0.087	-	-	91.990
4	0.026	5.616	0.079	-	-	0.198	-	85.333	1.053	0.109	0.022	0.155	0.060	-	-	92.651
5	-	5.152	-	-	0.122	0.339	0.010	86.325	0.566	0.106	-	0.052	0.087	-	-	92.759
6	0.048	4.175	0.064	-	-	0.215	0.014	89.177	0.578	-	0.053	0.050	0.051	-	-	94.425
7	-	5.022	0.120	-	-	0.551	0.004	86.289	0.356	0.029	-	0.061	0.050	-	-	92.482
8	-	3.798	-	-	0.099	0.001	-	86.103	1.370	0.172	-	0.068	0.125	-	-	91.736
9	-	5.264	-	-	0.022	0.415	-	85.188	0.979	0.065	-	0.156	0.131	-	0.001	92.221
10	-	5.537	-	-	-	0.244	0.019	84.327	0.926	0.097	0.028	0.193	0.126	-	0.001	91.498

序号	同位素比值			年龄(Ma)
序号	²⁰⁷Pb/²⁰⁶Pb(1 σ)	²⁰⁷Pb/²³⁵U(1 σ)	²⁰⁶Pb/²³⁸U(1 σ)	²⁰⁷Pb/²³⁵U(1 σ)	²⁰⁶Pb/²³⁸U(1 σ)
1	0.06260(0.00036)	0.09195(0.00201)	0.01065(0.00024)	67.0(1.52)	68.3(1.52)
2	0.06292(0.00039)	0.09428(0.00267)	0.01088(0.00030)	68.4(1.92)	69.8(1.92)
3	0.06279(0.00033)	0.10192(0.00224)	0.01177(0.00025)	74.0(1.61)	75.4(1.61)
4	0.06581(0.00037)	0.10382(0.00239)	0.01144(0.00026)	71.7(1.68)	73.4(1.68)
5	0.06502(0.00048)	0.10066(0.00248)	0.01124(0.00027)	70.4(1.74)	72.0(1.74)
6	0.06341(0.00033)	0.09527(0.00260)	0.01091(0.00030)	68.5(1.88)	69.9(1.88)
7	0.06512(0.00044)	0.10260(0.00267)	0.01144(0.00030)	71.7(1.93)	73.3(1.93)
8	0.06722(0.00040)	0.10333(0.00280)	0.01114(0.00029)	69.6(1.85)	71.4(1.85)
9	0.06404(0.00031)	0.10382(0.00418)	0.01177(0.00049)	73.9(3.13)	75.5(3.13)
10	0.06495(0.00035)	0.10267(0.00339)	0.01147(0.00039)	71.9(2.46)	73.5(2.46)
11	0.06163(0.00034)	0.10093(0.00380)	0.01188(0.00045)	74.8(2.84)	76.1(2.84)
12	0.06245(0.00037)	0.10146(0.00394)	0.01176(0.00046)	74.0(2.93)	75.4(2.93)

序号	同位素比值			年龄(Ma)
序号	²⁰⁷Pb/²⁰⁶Pb(1 σ)	²⁰⁷Pb/²³⁵U(1 σ)	²⁰⁶Pb/²³⁸U(1 σ)	²⁰⁷Pb/²³⁵U(1 σ)	²⁰⁶Pb/²³⁸U(1 σ)
1	0.06260(0.00036)	0.09195(0.00201)	0.01065(0.00024)	67.0(1.52)	68.3(1.52)
2	0.06292(0.00039)	0.09428(0.00267)	0.01088(0.00030)	68.4(1.92)	69.8(1.92)
3	0.06279(0.00033)	0.10192(0.00224)	0.01177(0.00025)	74.0(1.61)	75.4(1.61)
4	0.06581(0.00037)	0.10382(0.00239)	0.01144(0.00026)	71.7(1.68)	73.4(1.68)
5	0.06502(0.00048)	0.10066(0.00248)	0.01124(0.00027)	70.4(1.74)	72.0(1.74)
6	0.06341(0.00033)	0.09527(0.00260)	0.01091(0.00030)	68.5(1.88)	69.9(1.88)
7	0.06512(0.00044)	0.10260(0.00267)	0.01144(0.00030)	71.7(1.93)	73.3(1.93)
8	0.06722(0.00040)	0.10333(0.00280)	0.01114(0.00029)	69.6(1.85)	71.4(1.85)
9	0.06404(0.00031)	0.10382(0.00418)	0.01177(0.00049)	73.9(3.13)	75.5(3.13)
10	0.06495(0.00035)	0.10267(0.00339)	0.01147(0.00039)	71.9(2.46)	73.5(2.46)
11	0.06163(0.00034)	0.10093(0.00380)	0.01188(0.00045)	74.8(2.84)	76.1(2.84)
12	0.06245(0.00037)	0.10146(0.00394)	0.01176(0.00046)	74.0(2.93)	75.4(2.93)