Characteristics of Petrology,Geochemistry and U-Pb Dating of Zircon from the Jiangbian Pluton in the Yangla Copper Deposit, Western Yunnan

doi:10.19657/j.geoscience.1000-8527.2020.02.01

Abstract

Abstract:

Yangla copper deposit is a large deposit of Jinshajiang-Ailaoshan copper-gold metallogenic belt in Three-river area, which located in the bonding zone of Jinshajiang plate between Zhongza micro-continent fragment and Changdu-Simao block. The results show that the major elements of the Jiangbian granodiorite-rock mass is a typical I-type granite, with high SiO₂, Al and lithophile elements, and deficit of Fe, Mg and high field strength elements.Besides, the samples mainly fall into the transitional regions of volcanic-arc granite and syn-collision granite, which reflects the Jiangbian granodiorite pluton is the products of active plate margin, and the main magmatic fluid compositions are mantle and accompanied with input of melting of the crust. Zircon U-Pb dating by LA-ICP-MS method indicated that the ages of ZKJ1-1-14 and ZKJ2-1-7 granodiorite porphyry were 215 Ma and 208 Ma, and ZKJ1-1-17, ZKJ2-1-6 and ZKJ2-1-8 granodiorite were 221 Ma, 220 Ma and 214 Ma, respectively. Based on the crystallizing age of Lunong pluton, Linong pluton, Jiangbian pluton and Beiwu pluton, this paper hold that the magmatic intrusions tended to freshen from southern mining area to northern mining area. And the magmatism in the Jiangbian area was active for a long period (about 25 Ma). This research corroborated that the Jiangbian rock mass is a island-arc type granite associated subduction-collision and formed in post-collisional extensional environment.

Key words: granodiorite, geochemistry, U-Pb dating, Yangla copper deposit

CLC Number:

YANG Fan, YU Can, JIAN Runtang, YAO Zhihua. Characteristics of Petrology,Geochemistry and U-Pb Dating of Zircon from the Jiangbian Pluton in the Yangla Copper Deposit, Western Yunnan[J]. Geoscience, 2020, 34(02): 215-232.

Figures/Tables 24

References 40

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氯化物	ZKJ1-1-5		ZKJ1-1-8					ZKJ1-1-17
氯化物	闪长玢岩		花岗闪长斑岩					花岗闪长岩
SiO₂	53.73	66.22		63.21	62.65	64.60	67.77		60.33	70.36
TiO₂	0.71	0.37		0.38	0.39	0.33	0.35		0.94	0.30
Al₂O₃	16.21	14.78		15.49	14.38	13.77	15.13		14.19	14.98
Fe₂O₃	1.20	0.32		0.63	2.26	0.85	0.66		1.70	0.47
FeO	6.39	3.37		2.73	0.80	2.16	2.94		6.89	2.10
MnO	0.13	0.067		0.11	0.078	0.068	0.08		0.16	0.03
MgO	4.79	1.72		1.51	1.07	1.20	1.39		3.40	0.91
CaO	7.59	2.93		3.29	5.57	4.76	3.45		4.00	2.16
Na₂O	2.78	3.94		0.08	1.44	0.084	2.99		2.46	2.86
K₂O	2.52	3.24		4.66	3.12	2.70	3.52		3.87	4.14
P₂O₅	0.13	0.09		0.08	0.09	0.08	0.08		0.20	0.09
H₂O⁺	2.49	1.87		2.63	3.09	3.52	1.18		1.25	1.06
H₂O^-	0.32	0.29		0.33	0.98	0.46	0.19		0.19	0.24
灼失量	3.65	2.81		7.75	8.08	9.34	1.50		1.67	1.45
总和	99.84	99.86		99.91	99.94	99.94	99.86		99.79	99.85
σ₄₃	2.37	2.17		1.03	0.98	0.33	1.69		2.26	1.78
A/CNK	0.77	0.97		1.39	0.90	1.17	1.01		0.92	1.14
DI	43.10	74.63		67.62	64.76	63.35	72.88		58.83	80.61
SI	27.08	13.63		15.7	12.54	17.17	12.05		18.55	8.67

氯化物	ZKJ1-1-5		ZKJ1-1-8					ZKJ1-1-17
氯化物	闪长玢岩		花岗闪长斑岩					花岗闪长岩
SiO₂	53.73	66.22		63.21	62.65	64.60	67.77		60.33	70.36
TiO₂	0.71	0.37		0.38	0.39	0.33	0.35		0.94	0.30
Al₂O₃	16.21	14.78		15.49	14.38	13.77	15.13		14.19	14.98
Fe₂O₃	1.20	0.32		0.63	2.26	0.85	0.66		1.70	0.47
FeO	6.39	3.37		2.73	0.80	2.16	2.94		6.89	2.10
MnO	0.13	0.067		0.11	0.078	0.068	0.08		0.16	0.03
MgO	4.79	1.72		1.51	1.07	1.20	1.39		3.40	0.91
CaO	7.59	2.93		3.29	5.57	4.76	3.45		4.00	2.16
Na₂O	2.78	3.94		0.08	1.44	0.084	2.99		2.46	2.86
K₂O	2.52	3.24		4.66	3.12	2.70	3.52		3.87	4.14
P₂O₅	0.13	0.09		0.08	0.09	0.08	0.08		0.20	0.09
H₂O⁺	2.49	1.87		2.63	3.09	3.52	1.18		1.25	1.06
H₂O^-	0.32	0.29		0.33	0.98	0.46	0.19		0.19	0.24
灼失量	3.65	2.81		7.75	8.08	9.34	1.50		1.67	1.45
总和	99.84	99.86		99.91	99.94	99.94	99.86		99.79	99.85
σ₄₃	2.37	2.17		1.03	0.98	0.33	1.69		2.26	1.78
A/CNK	0.77	0.97		1.39	0.90	1.17	1.01		0.92	1.14
DI	43.10	74.63		67.62	64.76	63.35	72.88		58.83	80.61
SI	27.08	13.63		15.7	12.54	17.17	12.05		18.55	8.67

元素	ZKJ1-1-5	ZKJ1-1-8	ZKJ1-1-12	ZKJ1-1-14	ZKJ2-1-7	ZKJ1-1-17	ZKJ2-1-6	ZKJ2-1-8
元素	闪长玢岩	花岗闪长斑岩				花岗闪长岩
V	130.00	50.00	47.40	53.80	47.80	46.30	74.90	44.30
Cr	34.90	10.10	7.66	9.66	8.73	11.10	18.20	8.87
Co	24.80	8.91	4.70	7.91	7.96	7.78	17.50	5.56
Ni	14.60	3.76	2.93	3.76	3.49	3.24	6.47	2.42
Cu	14.80	4.54	34.20	3.32	6.91	5.85	6.06	41.40
Zn	69.70	39.20	73.10	53.40	49.90	42.00	69.40	32.60
Ga	18.90	18.80	16.90	16.30	14.30	16.40	16.60	22.80
Rb	111.00	123.00	272.00	145.00	109.00	109.00	136.00	162.00
Sr	318.00	266.00	78.80	129.00	63.00	298.00	190.00	331.00
Zr	102.00	128.00	102.00	109.00	141.00	131.00	187.00	143.00
Nb	6.68	9.32	5.84	5.61	6.76	8.06	15.10	14.20
Mo	0.85	0.86	0.56	0.79	1.06	0.43	0.90	0.61
Cd	0.09	0.04	0.63	0.13	0.15	0.03	0.04	0.04
In	0.04	0.02	0.16	0.03	0.04	0.03	0.06	0.02
Cs	9.19	12.30	29.80	65.50	16.90	10.80	10.20	9.13
Ba	663.00	777.00	351.00	234.00	296.00	926.00	1 032.00	979.00
Hf	4.51	5.55	4.32	4.15	5.61	6.44	7.85	5.42
Ta	0.88	1.22	0.87	0.82	0.77	1.21	1.32	1.60
W	1.28	2.40	4.61	2.86	1.80	1.83	0.54	0.75
Tl	1.12	1.12	3.47	1.41	0.81	0.72	0.99	1.20
Pb	9.34	15.00	119.00	22.40	18.00	30.80	18.70	41.0
Bi	0.12	0.04	0.78	0.14	0.16	0.05	0.04	0.40
Th	10.80	15.80	17.10	16.90	21.10	19.70	18.80	20.60
U	1.77	5.22	3.55	3.72	3.61	4.25	2.28	8.98
P	584.00	419.00	342.00	417.00	322.00	337.00	744.00	475.00
Ti	4 504.00	2 485.00	1 703.00	1 706.00	1 740.00	2 078.00	4 929.00	2 318.00
F	201.00	339.00	811.00	391.00	313.00	369.00	692.00	343.00
Ag	0.06	0.05	0.47	0.11	0.08	0.04	0.05	0.07
Sn	2.83	2.69	39.20	4.27	6.60	3.01	6.56	2.53
B	17.80	18.60	226.00	121.00	79.50	25.80	10.30	24.90
As	5.80	3.90	51.00	11.00	19.00	10.20	5.30	1.50
Sb	0.71	1.21	29.60	0.82	0.92	0.75	0.45	0.26
Ge	1.80	1.48	1.72	0.68	1.08	1.32	1.68	1.34

元素	ZKJ1-1-5	ZKJ1-1-8	ZKJ1-1-12	ZKJ1-1-14	ZKJ2-1-7	ZKJ1-1-17	ZKJ2-1-6	ZKJ2-1-8
元素	闪长玢岩	花岗闪长斑岩				花岗闪长岩
V	130.00	50.00	47.40	53.80	47.80	46.30	74.90	44.30
Cr	34.90	10.10	7.66	9.66	8.73	11.10	18.20	8.87
Co	24.80	8.91	4.70	7.91	7.96	7.78	17.50	5.56
Ni	14.60	3.76	2.93	3.76	3.49	3.24	6.47	2.42
Cu	14.80	4.54	34.20	3.32	6.91	5.85	6.06	41.40
Zn	69.70	39.20	73.10	53.40	49.90	42.00	69.40	32.60
Ga	18.90	18.80	16.90	16.30	14.30	16.40	16.60	22.80
Rb	111.00	123.00	272.00	145.00	109.00	109.00	136.00	162.00
Sr	318.00	266.00	78.80	129.00	63.00	298.00	190.00	331.00
Zr	102.00	128.00	102.00	109.00	141.00	131.00	187.00	143.00
Nb	6.68	9.32	5.84	5.61	6.76	8.06	15.10	14.20
Mo	0.85	0.86	0.56	0.79	1.06	0.43	0.90	0.61
Cd	0.09	0.04	0.63	0.13	0.15	0.03	0.04	0.04
In	0.04	0.02	0.16	0.03	0.04	0.03	0.06	0.02
Cs	9.19	12.30	29.80	65.50	16.90	10.80	10.20	9.13
Ba	663.00	777.00	351.00	234.00	296.00	926.00	1 032.00	979.00
Hf	4.51	5.55	4.32	4.15	5.61	6.44	7.85	5.42
Ta	0.88	1.22	0.87	0.82	0.77	1.21	1.32	1.60
W	1.28	2.40	4.61	2.86	1.80	1.83	0.54	0.75
Tl	1.12	1.12	3.47	1.41	0.81	0.72	0.99	1.20
Pb	9.34	15.00	119.00	22.40	18.00	30.80	18.70	41.0
Bi	0.12	0.04	0.78	0.14	0.16	0.05	0.04	0.40
Th	10.80	15.80	17.10	16.90	21.10	19.70	18.80	20.60
U	1.77	5.22	3.55	3.72	3.61	4.25	2.28	8.98
P	584.00	419.00	342.00	417.00	322.00	337.00	744.00	475.00
Ti	4 504.00	2 485.00	1 703.00	1 706.00	1 740.00	2 078.00	4 929.00	2 318.00
F	201.00	339.00	811.00	391.00	313.00	369.00	692.00	343.00
Ag	0.06	0.05	0.47	0.11	0.08	0.04	0.05	0.07
Sn	2.83	2.69	39.20	4.27	6.60	3.01	6.56	2.53
B	17.80	18.60	226.00	121.00	79.50	25.80	10.30	24.90
As	5.80	3.90	51.00	11.00	19.00	10.20	5.30	1.50
Sb	0.71	1.21	29.60	0.82	0.92	0.75	0.45	0.26
Ge	1.80	1.48	1.72	0.68	1.08	1.32	1.68	1.34

元素	ZKJ1-1-5	ZKJ1-1-8	ZKJ1-1-12	ZKJ1-1-14	ZKJ2-1-7	ZKJ1-1-17	ZKJ2-1-6	ZKJ2-1-8
元素	闪长玢岩	花岗闪长斑岩				花岗闪长岩
Y	16.90	13.50	13.60	14.60	10.90	14.00	26.70	11.30
La	14.40	22.20	30.20	22.90	31.30	21.10	44.60	26.70
Ce	27.30	36.40	51.90	37.50	48.90	36.50	78.60	45.80
Pr	3.92	4.64	6.26	4.80	5.76	4.71	10.00	5.82
Nd	15.50	16.20	20.90	16.90	19.10	16.80	35.80	20.00
Sm	3.28	2.98	3.33	3.03	3.07	3.10	6.37	3.68
Eu	0.92	0.97	0.71	0.83	0.67	0.81	1.08	0.93
Gd	3.11	2.74	3.15	2.89	2.82	2.76	6.02	3.07
Tb	0.54	0.43	0.47	0.46	0.40	0.43	0.92	0.46
Dy	3.15	2.30	2.44	2.44	1.96	2.40	4.89	2.19
Ho	0.66	0.48	0.52	0.51	0.40	0.51	0.99	0.40
Er	1.85	1.36	1.50	1.49	1.12	1.49	2.81	1.07
Tm	0.35	0.26	0.28	0.30	0.22	0.29	0.54	0.19
Yb	2.02	1.53	1.61	1.68	1.15	1.71	2.91	1.08
Lu	0.27	0.21	0.22	0.24	0.19	0.27	0.41	0.17
ΣREE	94.23	106.22	137.07	110.60	128.03	106.96	222.65	122.79
LREE/HREE	5.47	8.97	11.11	8.59	13.19	8.43	9.05	11.93
(La/Yb)_N	4.25	8.63	11.10	8.09	16.25	7.35	9.11	14.75
δEu	0.95	1.12	0.72	0.93	0.75	0.91	0.58	0.90
δCe	0.75	0.72	0.75	0.72	0.71	0.74	0.75	0.74