湘东大富岭铀矿床沥青铀矿LA-ICP-MS原位U-Pb年龄及矿床成因意义

doi:10.19657/j.geoscience.1000-8527.2024.028

摘要/Abstract

摘要：

大富岭铀矿床隶属于湘东明月峰矿田,为该矿集区新探明的花岗岩外带型铀矿床。近年来找矿勘探的实践表明,该矿床具有较大的铀矿化规模和找矿前景。然而,由于对该矿床铀矿物特征的分析及其铀成矿时代约束较为薄弱,在一定程度上制约了对矿床成因的理解。鉴于此,本文在详细的野外地质调查基础上,采集了典型的铀矿石样品,通过室内岩矿鉴定、扫描电镜、电子探针和LA-ICP-MS等测试方法,首次解译了该矿床铀矿物特征及其成矿时代。结果表明,该矿床出露铀矿物主要为沥青铀矿,铀成矿年龄约为70 Ma,成矿时代属白垩纪晚期。结合大地构造背景,初步认为其成矿作用与华南中生代(75~70 Ma)岩石圈伸展减薄事件密切相关,间接指示大富岭铀矿床可能形成于岩石圈伸展减薄的构造动力学背景。

关键词: 沥青铀矿, LA-ICP-MS, 铀成矿年龄, 大富岭矿床, 明月峰矿田

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

中图分类号:

P611

范鹏飞, 申锡坤, 黄广文, 李满根, 谷勇, 王珂, 刘涛, 郭业达. 湘东大富岭铀矿床沥青铀矿LA-ICP-MS原位U-Pb年龄及矿床成因意义[J]. 现代地质, 2025, 39(04): 920-930.

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.

图/表 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)