皖南伏岭岩体岩石成因及对铷富集的指示

doi:10.11720/wtyht.2024.1268

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Abstract

The Fuling rock mass in southern Anhui Province, located in the eastern section of the Jiangnan uplift zone, is a complex granitic rock mass that has experienced multi-stage evolution. It primarily comprises two lithologies: Monzogranite and K-feldspar granite. By investigating the geological, petrographic, and petrogeochemical characteristics of the Fuling rock mass, this study delved into its evolutionary characteristics, genetic types, and tectonic environment, aiming to clarify its indication significance for rubidium enrichment. The results of this study are as follows: ① The geochemical characteristics of the Fuling rock mass demonstrate high SiO₂, Na₂O, K₂O, and Al₂O₃ contents, high w(K₂O)/w(Na₂O) ratios, and aluminum saturation indices (A/CNK) ranging from 0.95~1.08 (average: 0.99), suggesting high-K calc-alkaline quasi-aluminous to peraluminous granites; ② In terms of trace elements, the Fuling rock mass possesses high Li, Rb, Nd, and Ta contents and significantly low Sr and Ba contents, which may be associated with the fractional crystallization of feldspar; ③ The w(Nb)/w(Ta) ratios ranging from 5.71~10.94 (average: 8.41) and Mg^# values ranging from 0.02~0.31 (average: 0.13) indicate that the Fuling rock mass was primarily derived from the partial melting of lower crust rocks, suggesting A-type granites in a non-orogenic extensional environment; ④ The Rb content in the Fuling rock mass increases with the magmatic evolution degree. Compared to monzogranites, K-feldspar granites with a higher evolution degree display higher Rb content, implying that the Rb content in the Fuling rock mass is generally controlled by magmatic evolution. Overall, this study holds some reference significance for understanding the Yanshanian diagenesis and mineralization of southern Anhui Province.

Key words： granite petrolgenesis geochemistry rubidium Fuling rock mass

Received: 19 June 2023 Published: 27 June 2024

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	Jun ZHANG
	Nai TAO
	Shang-Xing QI
	Zhi-Qiang WANG
	Hao-Xiang DA

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Jun ZHANG,Nai TAO,Shang-Xing QI, et al. Petrogenesis and rubidium enrichment indication of the Fuling rock mass in southern Anhui Province[J]. Geophysical and Geochemical Exploration, 2024, 48(3): 584-596.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1268 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I3/584

16] (a) and geological map^[8](b) of Fuling pluton
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Tectonic location^[16] (a) and geological map^[8](b) of Fuling pluton

Hand specimen and microscopic photo of Fuling pluton
a~d—monzonite granite; e~h—moyite. Qtz—quartz; Kfs—K-feldspar; Pl—plagioclase; Bt—biotite

样号	FL67	FL112	FL66	FL19	FL47	FL111	FL61	FL115	FL70	FL71	FL72	FL77	FL12	FL14	FL54	FL56	FL74
花岗岩岩性	二长	二长	二长	二长	二长	二长	二长	二长	钾长	钾长	钾长	钾长	钾长	钾长	钾长	钾长	钾长
主量元素/%
SiO₂	73.32	73.31	71.06	73.66	73.99	72.36	72.43	72.99	74.80	74.83	75.51	74.61	76.74	75.81	74.05	74.54	74.39
Al₂O₃	12.43	12.55	12.64	13.55	12.48	12.75	11.95	12.71	11.64	11.65	12.13	12.44	12.38	12.57	12.47	12.69	11.68
^TFe₂O₃	1.79	1.55	2.05	2.04	1.36	1.72	1.64	1.76	1.11	1.10	1.05	0.97	0.81	0.86	0.88	0.96	1.14
^TFeO	1.61	1.40	1.84	1.84	1.22	1.55	1.48	1.58	1.00	0.99	0.94	0.87	0.73	0.77	0.79	0.86	1.03
K₂O	5.10	5.27	5.06	5.48	5.19	5.19	5.00	5.62	4.59	4.60	4.29	4.89	4.45	4.39	4.62	4.61	4.64
Na₂O	3.40	3.32	3.10	3.18	3.69	3.36	3.22	3.29	3.59	3.61	3.99	3.85	3.99	4.12	4.09	3.93	3.63
CaO	1.07	0.68	1.33	0.78	0.73	0.89	1.02	0.70	0.64	0.64	0.55	0.66	0.35	0.24	0.52	0.28	0.61
MgO	0.23	0.22	0.47	0.20	0.05	0.29	0.20	0.23	0.05	0.05	0.02	0.04	0.03	0.02	0.02	0.01	0.05
P₂O₅	0.05	0.04	0.08	0.05	0.02	0.05	0.05	0.05	0.02	0.02	0.02	0.02	0.02	0.02	0.02	0.02	0.02
TiO₂	0.18	0.13	0.27	0.21	0.08	0.18	0.17	0.19	0.05	0.05	0.02	0.04	0.02	0.01	0.01	0.01	0.06
MnO	0.04	0.03	0.04	0.04	0.03	0.04	0.03	0.04	0.06	0.05	0.06	0.05	0.05	0.06	0.07	0.06	0.07
烧失量	1.55	2.13	1.71	2.28	1.20	2.29	2.20	2.24	2.75	2.16	1.17	2.92	1.33	2.88	2.95	1.24	1.53
总量	100.77	100.62	97.81	101.47	100.04	99.12	99.38	99.82	99.30	98.76	98.81	100.49	100.17	100.98	99.70	98.35	97.81
Mg^#	0.20	0.22	0.31	0.16	0.07	0.25	0.19	0.21	0.08	0.08	0.04	0.08	0.07	0.04	0.04	0.02	0.08
A/NK	1.12	1.12	1.20	1.21	1.07	1.14	1.12	1.11	1.07	1.07	1.08	1.07	1.09	1.09	1.06	1.11	1.06
A/CNK	0.95	1.01	0.97	1.08	0.96	1.00	0.95	1.00	0.97	0.96	0.99	0.97	1.03	1.05	0.98	1.06	0.97
R1	2434	2429	2391	2439	2368	2365	2466	2330	2605	2597	2582	2434	2633	2538	2377	2467	2551
R2	370	330	414	359	325	360	353	336	299	299	298	317	282	273	301	279	297
样号	FL67	FL112	FL66	FL19	FL47	FL111	FL61	FL115	FL70	FL71	FL72	FL77	FL12	FL14	FL54	FL56	FL74
花岗岩岩性	二长	二长	二长	二长	二长	二长	二长	二长	钾长	钾长	钾长	钾长	钾长	钾长	钾长	钾长	钾长
微量元素/10^-6
Li	57.70	27.00	47.20	33.10	33.00	50.90	46.30	49.70	109.00	19.90	31.80	79.40	93.20	91.00	202.00	149.00	20.50
Be	2.80	4.22	2.87	1.73	1.63	3.14	3.54	3.27	4.80	5.01	6.54	3.06	2.68	1.59	1.56	0.94	11.40
Co	1.93	1.89	3.18	5.54	7.21	1.84	1.98	1.81	0.63	0.46	0.59	0.55	6.00	6.16	1.90	2.35	0.76
Ni	10.40	22.50	15.70	12.10	7.98	14.90	15.50	18.90	5.73	7.81	12.20	10.90	15.50	22.70	8.23	7.24	13.00
Rb	220.00	255.00	243.00	209.00	268.00	230.00	208.00	228.00	386.00	348.00	421.00	340.00	416.00	571.00	708.00	605.00	427.00
Sr	75.30	49.80	124.30	103.30	30.40	73.30	80.90	58.20	14.40	14.20	9.60	17.40	10.10	6.20	4.60	5.10	11.30
Zr	158.90	138.10	192.30	228.90	153.20	143.40	151.20	147.70	101.10	101.40	119.30	90.10	80.10	113.20	50.70	113.30	95.30
Nb	14.90	12.20	14.80	16.30	14.20	12.10	11.60	12.70	23.80	22.20	44.80	25.70	39.60	56.00	53.50	49.40	48.70
Sn	4.68	5.15	6.49	3.17	3.56	4.95	3.93	3.32	8.78	5.95	12.00	5.37	3.98	3.17	2.36	1.63	4.67
Ba	338.50	276.20	539.10	374.10	189.50	361.00	353.10	204.70	52.40	56.70	50.10	65.60	53.90	52.70	42.90	46.00	56.60
Ta	2.30	1.94	1.55	1.49	1.46	1.37	1.32	1.17	3.12	2.59	4.86	2.84	6.93	8.28	5.21	7.46	6.30
W	0.60	5.20	0.59	1.31	0.41	0.95	0.81	1.22	1.95	2.71	4.61	2.62	0.69	0.39	10.20	0.36	7.96
Th	21.80	28.30	26.60	7.36	8.52	19.10	18.90	21.10	32.40	37.80	41.20	19.90	13.40	8.17	4.91	4.66	40.20

Analysis results of major elements, trace elements and characteristics of related parameters of Fuling pluton

21]; Fig.b base image according to references [22].
">

w(SiO₂)-w(K₂O) diagram (a) and TAS classification diagram (b) of granite in Fuling pluton
Fig.b: 1—olivine-gabbro; 2a—alkaline gabbro; 2b—subalkaline gabbro; 3—gabbro-diorite; 4—diorite; 5—granodiorite; 6—granite; 7—quartzolite; 8—monzogabbro; 9—monzodiorite; 10—monzonite; 11—quartz-monzonite; 12—syenite; 13—subsyenite; 14—foid-monzosyenite; 15—foid-monzodiorite; 16—foid-gabbro; 17—foidolite; 18—aegironite/phosphonephelin/coarse leucoite. Fig.a base image according to references [21]; Fig.b base image according to references [22].

23]; Fig.b base image according to references [24]. The legend is the same as Fig.3
">

Diagram of A/CNK-A/NK (a) and w(K₂O)-w(Na₂O) (b) of Fuling pluton
Fig.a base image according to references [23]; Fig.b base image according to references [24]. The legend is the same as Fig.3

Harker diagram of major elements of Fuling pluton

Harker diagram of trace elements of Fuling pluton

39]; Fig.b and Fig.c base image according to references [23].
">

Tectonic environment discriminant diagram of Fuling pluton
RRG—granites associated with rift valley; CEUG—granitoids associated with continental uplift; POG—postorogenic granites; IAG—island arc granites; CAG—continental arc granites; CCG—continental collision granites. Fig.a base image according to references [39]; Fig.b and Fig.c base image according to references [23].

w(Rb)-w(K)/w(Rb) and w(Rb)-w(Rb)/w(Sr) covariation diagrams of different stages of Fuling pluton

50].
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Simulation of trace elements in Fuling granite based on Rayleigh separation crystallization
Since Rb, Sr and Ba are mainly controlled by major minerals, the effect of accessory minerals is not considered in the separated phase here, and FC1 separates the mineral phase combination: 35% quartz + 40% plagioclase + 15% K-feldspar + 5% biotite; The trend line of separation crystallization evolution is spaced by 10%. The distribution coefficients of Rb, Sr and Ba for each mineral are quoted from references [50].

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