临沧地区富铀花岗岩体地球化学特征及其地质意义

doi:10.11720/wtyht.2020.1554

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Abstract

Petrographic and geochemical study and U-Pb dating of uranium-rich granite bodies in Lincang area were carried out for Shuangjiang 701 and Fengqing 901 uranium mines, with the purpose of exploring the relationship between petrogenesis type, diagenetic tectonic background and uranium mineralization. The results show that Lincang uranium-rich granite body has high Si (up to 90.11%, averaging 71.6%), rich alkali, high potassium and high Ca, thus belonging to high Al and high potassium calcium alkaline series rocks. U-Pb zircon dating yielded 214±12 Ma, and thus Lincang uranium-rich granite body was formed in Late Indochina. Rare earth elements show a slightly rightward "V" shape, with obvious fractionation of light and heavy rare earth elements (w(LREE)/w(HREE) 7.26 on average), obvious negative Eu anomaly (δEu=0.28 ~ 0.49), relative enrichment of Rb, U and Th, and relative loss of Ba, Nb, Sr, Ti and Eu. Comprehensive analysis shows that Lincang uranium-rich granite belongs to S-type granite with obvious differentiation, which must have originated from melting of upper crust material and was formed in a mountain-building and rift environment in late collision, belonging to the simultaneous collision of granite related to the Lancang River collision zone. Its high content of uranium provided part of the uranium source for the uranium mineralization process. Uranium elements were transported to the vicinity of the fault fracture zone and was enriched to form granite-type uranium deposits by leaching.

Key words： Lincang uranium-rich granite geochemical characteristics

Received: 27 November 2019 Published: 26 October 2020

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Corresponding Authors: XU Zheng-Qi E-mail: 1067239658@qq.com;547510779@qq.com

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	Jian-Min TIAN
	Zheng-Qi XU
	Ming-Hui YIN
	Tao LI
	Kang SUN

Cite this article:

Jian-Min TIAN,Zheng-Qi XU,Ming-Hui YIN, et al. Geochemical characteristics and geological significance of uranium-rich granites in Lincang area[J]. Geophysical and Geochemical Exploration, 2020, 44(5): 1103-1115.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1554 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I5/1103

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a—structure location map;b—geological sketch of the study area
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Geological map of Sanjiang area(revised according to reference [21])
a—structure location map;b—geological sketch of the study area

Petrological characteristics of Lincang granite
a—porphyritic biotitemonzonite granite, containing multiple quartz veins; b—irregularly dark inclusions in medium-fine-grained granite; c—self-formed pentagonal quartz crystals in motley granite; d—self-shaped quartz particles, hematite is seriously mineralized; e—potassium feldspar is surrounded by quartz, and polycrystalline twin crystals develop; f—potassium feldspar card-type twin crystal, part of the potassium feldspar is kaolinized, plagioclase sericite;e and f are cross-polarized images;Q—quartz; Kf—potassium feldspar; Pl—plagioclase; Bi—biotite

编号	含量/10^-6			w(Th)/ w(U)	²⁰⁷Pb/²⁰⁶Pb	²⁰⁷Pb/²³⁵U	²⁰⁶Pb/²³⁸U	²⁰⁸Pb/²³²Th	²³⁸U/²³²Th	年龄(Ma)±1σ
编号	Pb	Th	U	w(Th)/ w(U)	²⁰⁷Pb/²⁰⁶Pb	²⁰⁷Pb/²³⁵U	²⁰⁶Pb/²³⁸U	²⁰⁸Pb/²³²Th	²³⁸U/²³²Th	²⁰⁷Pb/²⁰⁶Pb	²⁰⁷Pb/²³⁵U	²⁰⁶Pb/²³⁸U
YN057-01	49.9	444.3	1427.1	0.31	0.052	0.265	0.036	0.010	2.606	305.6±64.8	238.5±6.3	228.7±2.5
YN057-03	34.2	322.2	877.4	0.37	0.050	0.262	0.038	0.012	2.279	198.2±78.7	236.3±7.6	237.9±3.0
YN057-04	47.5	506.3	1136	0.45	0.053	0.266	0.036	0.013	1.863	322.3±77.8	239.9±7.0	230.8±2.4
YN057-05	55.3	483.3	1532.9	0.32	0.050	0.246	0.035	0.012	2.623	194.5±66.7	223.7±5.6	224.5±2.1
YN057-07	31.1	306.2	802.9	0.38	0.051	0.255	0.036	0.012	2.160	235.3±90.7	230.6±7.7	229.5±2.6
YN057-08	31.4	375.5	807.4	0.47	0.051	0.246	0.035	0.011	1.779	239±72.2	223.4±8.6	220.9±2.7
YN057-09	19.4	179.4	465.2	0.39	0.058	0.290	0.036	0.014	2.145	527.8±102.8	258.4±9.8	230±3.1
YN057-10	33.4	492.7	768.1	0.64	0.050	0.236	0.034	0.012	1.291	190.8±92.6	215±7.4	216.2±2.3
YN057-11	35.5	448.1	893.9	0.5	0.050	0.237	0.035	0.011	1.652	189±77.8	215.8±6.1	218.7±2.4
YN057-12	47.3	507.9	1266.8	0.4	0.050	0.245	0.035	0.011	2.081	213±41.7	222.8±6.1	222.9±2.2
YN057-13	15.9	212.7	368.4	0.58	0.053	0.270	0.037	0.011	1.435	320.4±110.2	242.7±9.7	234.9±3.3
YN057-14	16.3	160.8	436.9	0.37	0.052	0.248	0.035	0.012	2.273	333.4±98.1	224.6±8.5	219.6±2.7
YN057-15	57.4	817.9	1280.4	0.64	0.053	0.266	0.036	0.012	1.317	309.3±68.5	239.6±6.7	230.4±2.3
YN057-16	40	351.5	1108	0.32	0.053	0.262	0.035	0.012	2.652	344.5±66.7	236.1±6.3	224.8±2.4
YN057-17	31.3	236.2	879.2	0.27	0.055	0.280	0.037	0.013	3.006	420.4±78.7	250.4±8.0	232.5±2.6
YN057-18	24.8	254	681.9	0.37	0.049	0.235	0.035	0.012	2.247	200.1±95.4	214.5±7.4	220.5±2.6
YN057-19	32.9	479.3	789.7	0.61	0.052	0.246	0.034	0.012	1.378	298.2±81.5	223.3±7.0	215.7±2.6
YN057-20	36.9	401	1031.8	0.39	0.052	0.247	0.034	0.011	2.158	272.3±70.4	223.8±6.1	218.3±2.3
YN057-21	34.6	344.9	957.2	0.36	0.051	0.250	0.035	0.012	2.358	261.2±90.7	226.8±7.2	222.9±2.7
YN057-22	24.9	269.8	652.5	0.41	0.050	0.246	0.036	0.012	2.014	211.2±88.9	223.6±7.3	226.8±2.9
YN057-23	21.8	230.9	570.9	0.4	0.051	0.246	0.035	0.012	2.056	220.4±100	223±8.5	223.9±3.0
YN057-24	33.9	337.2	890.8	0.38	0.053	0.260	0.036	0.013	2.199	324.1±72.2	235±6.3	226.6±2.8
YN057-25	36.4	415.7	954.1	0.44	0.053	0.260	0.036	0.011	1.909	320.4±68.5	235±6.0	226.1±2.5
YN057-26	56.4	392.1	1686.9	0.23	0.055	0.265	0.035	0.013	3.575	413±68.5	238.7±6.1	221.7±3.1

Zircon LA-ICP-MS U-Pb dating results of Lincang rich uranium granite

Fengqing YN057 granite zircon CL image

YN057 zircon U-Pb age concord map

Analysis results of main elements of rich uranium granite in Lincang area %

Alkali-silicon (TAS) classification map of magma(igneous rock) system
Ir—Irvine dividing line is alkaline at the top and sub-alkaline at the bottom. 1—peridot gabbro; 2a—alkaline gabbro; 2b—subalkaline gabbro; 3—gabbro diorite; 4—diorite; 5—granodiorite; 6—granite; 7—siliconite; 8—bellmanite; 9—dellmanite; 10—dellmanite; 11—quartzite diorite; 12—synorite; 13—parsonite gabbro; 14—para-feldspar diorite; 15—para-feldspar syenite; 16—para-syenite syenite; 17—para-long diorite; 18—neonite,phosphorite,coarse white garnet

SiO₂-K₂O discrimination diagram

A/NK-A/CNK discrimination diagram of aluminum-quasi-aluminum granite

Element content and sampling position

元素	双江样品					凤庆样品
元素	YN027	YN028	YN029	YN030	YN031	YN050	YN051	YN052	YN053	YN054	YN055	YN056	YN057
La	25.40	16.20	28.20	22.60	28.70	13.60	11.70	14.80	11.50	29.80	2.37	20.70	49.50
Ce	56.90	34.80	57.10	41.70	62.40	27.60	23.20	29.00	17.40	63.40	2.66	37.90	81.50
Pr	7.67	4.48	6.87	5.14	7.73	3.37	3.13	3.40	2.72	6.87	0.47	4.90	10.70
Nd	25.80	17.70	28.00	20.90	27.30	12.30	11.20	13.00	9.96	26.30	2.17	18.70	38.80
Sm	6.26	5.64	7.12	4.27	9.28	2.53	2.49	2.54	1.87	6.09	0.70	3.85	7.87
Eu	0.75	0.88	1.06	0.53	1.60	0.21	0.21	0.22	0.20	0.51	0.13	0.39	0.70
Gd	4.51	5.59	5.97	3.64	11.40	1.81	1.89	1.84	1.62	4.59	0.89	3.32	6.60
Tb	0.81	1.31	1.19	0.53	2.78	0.29	0.29	0.32	0.26	0.82	0.20	0.52	1.18
Dy	4.11	7.92	6.34	2.76	17.60	1.27	1.48	1.54	1.29	3.66	1.04	2.87	6.05
Ho	0.74	1.60	1.11	0.52	3.97	0.29	0.30	0.31	0.26	0.69	0.22	0.51	1.16
Er	2.02	3.72	2.92	1.43	10.00	0.87	0.88	0.91	0.72	1.88	0.58	1.39	3.21
Tm	0.32	0.59	0.46	0.23	1.36	0.17	0.15	0.15	0.12	0.34	0.11	0.25	0.54
Yb	1.91	3.02	2.29	1.40	6.57	0.96	1.05	0.97	0.81	2.15	0.75	1.54	3.59
Lu	0.26	0.36	0.32	0.22	0.77	0.15	0.14	0.13	0.10	0.29	0.09	0.22	0.45
Be	6.40	8.21	6.79	6.14	6.05	2.06	3.60	2.08	1.59	5.26	2.49	5.76	6.52
Sc	6.70	6.34	6.52	5.32	4.47	2.99	2.90	3.28	1.66	4.83	0.41	2.83	5.82
V	45.80	28.20	32.10	22.50	38.80	15.20	21.80	11.60	6.98	20.70	58.30	383.00	25.10
Cr	15.90	11.60	12.40	10.60	10.60	3.30	3.40	3.61	2.35	6.66	9.64	8.47	9.24
Co	8.57	18.60	9.80	3.34	2.49	1.09	0.56	0.43	0.35	2.05	16.40	19.30	2.94
Ni	5.63	10.90	6.63	5.58	2.02	0.94	1.41	1.26	0.88	4.07	2.18	2.89	3.55
Cu	21.00	22.00	23.70	17.40	17.70	100.00	50.30	196.00	62.20	48.40	727.00	703.00	3.76
Zn	12.90	29.80	29.60	22.60	23.40	288.00	764.00	290.00	146.00	2407.00	59322.00	33929.00	140.00
Ga	21.40	21.00	23.80	19.00	18.20	13.00	11.50	9.77	5.94	19.00	31.00	25.70	19.20
Rb	289.00	294.00	306.00	271.00	268.00	217.00	212.00	211.00	124.00	403.00	13.90	226.00	313.00
Sr	48.80	58.70	61.30	72.90	64.90	6.91	10.60	5.09	2.32	28.40	7.09	17.50	60.20
Y	20.00	52.90	33.70	14.60	145.00	9.17	8.50	9.17	9.01	20.50	7.98	16.70	32.20
Mo	2.04	1.59	0.33	0.28	1.58	0.75	0.39	0.38	0.07	0.00	52.40	1.15	0.17
Cd	0.05	0.18	0.07	0.05	0.07	0.50	4.29	1.27	1.17	4.04	251.00	114.00	0.76
In	0.05	0.04	0.04	0.04	0.03	0.16	0.11	0.53	0.05	0.03	1.66	0.80	0.03
Sb	2.08	11.60	3.54	0.76	13.30	47.50	5.63	46.90	31.30	0.65	250.00	46.40	0.30
Cs	23.60	70.80	28.50	19.70	48.90	12.70	8.17	5.07	3.11	11.70	1.34	13.80	15.40
Ba	496.00	191.00	379.00	328.00	445.00	117.00	178.00	152.00	61.30	487.00	11.40	211.00	456.00
Tl	2.08	10.10	1.91	1.53	15.90	1.63	1.24	1.32	0.69	2.65	0.50	1.58	1.92
Pb	37.50	333.00	126.00	49.70	620.00	9446.00	551.00	10751.00	955.00	2219.00	28776.00	19703.00	89.00
Bi	1.06	2.34	0.52	0.57	1.60	15.90	0.68	2.82	5.28	2.07	29.60	23.50	0.75
Th	23.40	18.70	22.80	19.30	9.97	3.98	9.54	9.07	7.36	33.00	0.63	18.60	36.20
U	45.90	268.00	158.00	30.20	64.00	7.65	3.49	11.60	3.38	10.90	1751.00	1179.00	8.26
Nb	13.50	11.40	13.50	11.20	9.81	4.93	3.89	6.21	3.24	11.40	0.26	6.34	12.40
Ta	2.64	2.16	2.42	2.31	1.85	1.13	1.05	1.45	0.84	2.98	0.06	1.58	2.64
Zr	97.50	103.00	118.00	102.00	110.00	21.70	15.20	21.50	14.80	26.90	1.15	25.30	60.20
Hf	3.72	3.51	4.04	3.44	3.25	0.79	0.61	0.79	0.63	1.03	0.05	1.02	2.32

Analysis results of trace and rare earth elements in Lincang rich uranium granite 10^-6

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Trace element original mantle standardized spider map(the standardized value is quoted from Sun and McDonough^[27])

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Rare earth element chondrite standardization pattern(the standardized value is quoted from Sun and McDonough^[27])

Discrimination diagram of genetic types of uranium-enriched granites
a—TiO₂-Zr discrimination diagram;b—granite ACF diagram

Distinguishing diagram of the main and trace element structure environment of granite
IAG—island arc granite; CAG—continental arc granite; CCG—continent collision granite; POG—post-orogenic granite; RRG—rift-related granite; CEUG—continental tectonic uplift and granite; syn-COLG—co-crash granite; VAG—volcanic arc granite; WPG—in-plate granite; ORG—ocean ridge granite

Uranium geochemical anomaly map of the Yunnan section of the Sanjiang (revised according to reference [24])

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