Petrogenesis and Geological Significance of the Wenjiaping Granite in Jianglang Dome, Southern Rim of Songpan-Garze Orogenic Belt

doi:10.19657/j.geoscience.1000-8527.2018.01.02

Abstract

Abstract:

The petrogenesis and emplacement age of the Wenjiaping granite in the Jianglang dome remains unknown. Our petrological and geochemical data show that Wenjiaping granite is biotite granite, which is mainly composed of quartz (ca.40%), K-feldspar (ca. 35%), biotite (ca.15%) and plagioclase (<10%), with high SiO₂ (67.70%-70.09%), Na₂O+K₂O (7.43%-7.84%) and Zr+Nb+Ce+Y contents (363×10^-6-476×10^-6), high Mg^# (35.9-38.7) and 10,000×Ga/Al (2.58-2.84) values. They display enrichment of LREE and large ion lithophile elements (LILE) and depletion of high field strength elements (HFSE). Zircon U-Pb dating and Hf isotopic tracing indicate that the granite was crystallized at (164.6±0.9) Ma (n=21, MSWD=3.2) with ε_Hf(t) values of -13.0 to+1.4. Based on comprehensive studies, we proposed that the Wenjiaping granite belonged to a post-orogenic A2-type granite formed in lithospheric extension. The magma was chiefly originated from the Mesoproterozoic Liwu Group in the core of the Jianglang dome, with minor mantle-derived components. Combined with other geological evidence, we advocated that the doming of the Jianglang dome took place between the Early and Middle Jurassic, and the regional Cu and W mineralization was most likely associated with ca.165 Ma granitic magmatic activity.

Key words: Songpan-Garze orogenic belt, Jianglang dome, A2-type granite, petrogenesis

CLC Number:

P581
P597

ZHU Yudi, DAI Yanpei, WANG Lili, LI Tongzhu, ZHANG Huihua, SHEN Zhanwu. Petrogenesis and Geological Significance of the Wenjiaping Granite in Jianglang Dome, Southern Rim of Songpan-Garze Orogenic Belt[J]. Geoscience, 2018, 32(01): 16-27.

Figures/Tables 13

Fig.1 The tectonic position and regional geological map of the Jianglang dome(modified after reference [10])

Fig.2 Field and microscopic features of the strata and the Wenjiaping granite in the Jianglang dome

Table 1 Major (%) and trace element (10-6) contents of the Wenjiaping granite

样号	SiO₂	TiO₂	Al₂O₃	Fe₂ $O 3 T$	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量	FeO^T	Na₂O+ K₂O	A/CNK	Mg^#
WJP1-1	70.09	0.31	15.26	2.13	0.04	0.60	2.37	4.21	3.63	0.10	0.96	99.70	1.92	7.84	1.01	35.9
WJP1-2	69.57	0.38	15.38	2.58	0.04	0.78	2.67	4.18	3.25	0.13	0.32	99.28	2.32	7.43	1.01	37.5
WJP1-3	68.46	0.42	15.75	2.68	0.05	0.85	2.92	4.36	3.14	0.14	0.41	99.18	2.41	7.50	0.99	38.6
WJP1-4	67.70	0.45	15.70	3.02	0.05	0.96	2.85	4.27	3.34	0.16	0.37	98.87	2.72	7.61	0.99	38.7
WJP1-5	69.73	0.34	15.40	2.30	0.04	0.71	2.65	4.18	3.43	0.12	0.38	99.28	2.07	7.61	1.00	38.0
样号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	ΣREE	(La/Yb)_N
WJP1-1	62.4	106	8.78	29.6	4.14	1.21	3.09	0.36	2.09	0.37	0.99	0.15	0.94	0.14	220	44.9
WJP1-2	76.6	128	11.00	36.4	4.89	1.32	3.52	0.39	2.12	0.38	0.99	0.14	0.88	0.13	266	58.8
WJP1-3	83.9	141	12.60	42.0	5.75	1.53	4.16	0.51	2.63	0.47	1.22	0.17	1.07	0.16	297	53.0
WJP1-4	83.5	143	12.00	40.8	5.49	1.41	3.98	0.44	2.52	0.44	1.14	0.16	0.95	0.15	296	59.4
WJP1-5	60.8	104	8.91	29.9	4.16	1.15	3.01	0.35	2.00	0.35	0.89	0.12	0.71	0.11	216	57.9
样号	δEu	Cs	Rb	Sr	Ba	Nb	Ta	Zr	Hf	Th	U	Y	Ga	Rb/Sr	10000× Ga/Al	Zr+Nb+ Ce+Y
WJP1-1	0.99	5.41	159	729	1 405	26.4	1.70	226	5.20	23.2	7.79	11.0	22.3	0.22	2.76	369
WJP1-2	0.93	4.88	140	704	1 580	26.8	1.50	271	5.40	25.2	3.48	11.4	21.0	0.20	2.58	437
WJP1-3	0.91	5.08	140	716	1 530	29.8	1.80	276	5.90	29.5	4.28	13.0	21.7	0.19	2.60	459
WJP1-4	0.88	6.34	167	698	1 395	31.1	1.70	289	6.10	28.5	4.30	13.1	23.6	0.24	2.84	476
WJP1-5	0.95	4.42	145	702	1 540	23.7	1.40	225	4.70	21.0	3.51	10.3	21.2	0.21	2.60	363

Table 1 Major (%) and trace element (10-6) contents of the Wenjiaping granite

样号	SiO₂	TiO₂	Al₂O₃	Fe₂ $O 3 T$	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量	FeO^T	Na₂O+ K₂O	A/CNK	Mg^#
WJP1-1	70.09	0.31	15.26	2.13	0.04	0.60	2.37	4.21	3.63	0.10	0.96	99.70	1.92	7.84	1.01	35.9
WJP1-2	69.57	0.38	15.38	2.58	0.04	0.78	2.67	4.18	3.25	0.13	0.32	99.28	2.32	7.43	1.01	37.5
WJP1-3	68.46	0.42	15.75	2.68	0.05	0.85	2.92	4.36	3.14	0.14	0.41	99.18	2.41	7.50	0.99	38.6
WJP1-4	67.70	0.45	15.70	3.02	0.05	0.96	2.85	4.27	3.34	0.16	0.37	98.87	2.72	7.61	0.99	38.7
WJP1-5	69.73	0.34	15.40	2.30	0.04	0.71	2.65	4.18	3.43	0.12	0.38	99.28	2.07	7.61	1.00	38.0
样号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	ΣREE	(La/Yb)_N
WJP1-1	62.4	106	8.78	29.6	4.14	1.21	3.09	0.36	2.09	0.37	0.99	0.15	0.94	0.14	220	44.9
WJP1-2	76.6	128	11.00	36.4	4.89	1.32	3.52	0.39	2.12	0.38	0.99	0.14	0.88	0.13	266	58.8
WJP1-3	83.9	141	12.60	42.0	5.75	1.53	4.16	0.51	2.63	0.47	1.22	0.17	1.07	0.16	297	53.0
WJP1-4	83.5	143	12.00	40.8	5.49	1.41	3.98	0.44	2.52	0.44	1.14	0.16	0.95	0.15	296	59.4
WJP1-5	60.8	104	8.91	29.9	4.16	1.15	3.01	0.35	2.00	0.35	0.89	0.12	0.71	0.11	216	57.9
样号	δEu	Cs	Rb	Sr	Ba	Nb	Ta	Zr	Hf	Th	U	Y	Ga	Rb/Sr	10000× Ga/Al	Zr+Nb+ Ce+Y
WJP1-1	0.99	5.41	159	729	1 405	26.4	1.70	226	5.20	23.2	7.79	11.0	22.3	0.22	2.76	369
WJP1-2	0.93	4.88	140	704	1 580	26.8	1.50	271	5.40	25.2	3.48	11.4	21.0	0.20	2.58	437
WJP1-3	0.91	5.08	140	716	1 530	29.8	1.80	276	5.90	29.5	4.28	13.0	21.7	0.19	2.60	459
WJP1-4	0.88	6.34	167	698	1 395	31.1	1.70	289	6.10	28.5	4.30	13.1	23.6	0.24	2.84	476
WJP1-5	0.95	4.42	145	702	1 540	23.7	1.40	225	4.70	21.0	3.51	10.3	21.2	0.21	2.60	363

Fig.3 TAS and K2O-SiO2 diagrams of the Wenjiaping granite(the base map after MIDDLEMOST[27]and PECCERILLO et al.[28])

Fig.4 REE pattern(a) and trace element spidergrams (b) of the Wenjiaping granite(the values of chondrite, primitive-mantle and Liwu Group after TAYLOR et al.[29], SUN et al.[30] and LI et al.[31], respectively)

Table 2 Zircon U-Pb dating results of the Wenjiaping granite

点号	含量/10^-6			比值								年龄/Ma				谐和度/%
点号	Th	U		Th/U	²⁰⁷Pb/ ²⁰⁶Pb	±σ	²⁰⁷Pb/ ²³⁵U	±σ	²⁰⁶Pb/ ²³⁸U	±σ		²⁰⁷Pb/ ²³⁵U	±σ	²⁰⁶Pb/ ²³⁸U	±σ	谐和度/%
1	2 480	3 471	0.71		0.052 0	0.000 8	0.184 9	0.002 7	0.025 7	0.000 1	172.3		2.3	163.9	0.9	94
2	776	1 111	0.70		0.049 5	0.001 3	0.189 8	0.005 2	0.027 8	0.000 2	176.5		4.4	176.9	1.5	99
3	245	993	0.25		0.049 6	0.001 1	0.176 2	0.003 8	0.025 8	0.000 2	164.8		3.3	164.3	1.0	99
4	163	857	0.19		0.052 7	0.001 2	0.188 9	0.004 2	0.026 1	0.000 2	175.7		3.6	166.2	1.2	94
5	323	2 101	0.15		0.050 0	0.000 8	0.177 1	0.003 0	0.025 7	0.000 2	165.6		2.6	163.3	1.0	98
6	289	1 256	0.23		0.050 0	0.001 3	0.174 0	0.004 3	0.025 4	0.000 2	162.9		3.7	162.0	1.4	99
7	143	828	0.17		0.047 4	0.001 5	0.171 3	0.005 1	0.026 5	0.000 2	160.5		4.4	168.8	1.5	94
8	343	1 160	0.30		0.049 2	0.001 1	0.173 6	0.003 7	0.025 5	0.000 2	162.5		3.2	162.5	1.0	99
9	408	1 145	0.36		0.049 3	0.001 3	0.177 7	0.004 6	0.026 3	0.000 2	166.1		4.0	167.3	1.3	99
10	209	923	0.23		0.050 2	0.001 8	0.175 9	0.005 8	0.025 9	0.000 2	164.5		5.0	164.5	1.5	99
11	842	3 322	0.25		0.049 0	0.000 7	0.174 6	0.002 4	0.025 8	0.000 1	163.4		2.1	164.1	0.9	99
12	400	1 375	0.29		0.049 4	0.000 9	0.172 3	0.003 2	0.025 3	0.000 1	161.4		2.8	161.3	0.9	99
13	386	954	0.40		0.049 4	0.001 2	0.177 8	0.004 1	0.026 1	0.000 2	166.1		3.5	166.2	1.1	99
14	294	1 284	0.23		0.049 4	0.001 1	0.176 8	0.003 9	0.026 1	0.000 2	165.3		3.3	165.8	1.1	99
15	1 043	1 820	0.57		0.049 4	0.001 1	0.180 1	0.004 2	0.026 5	0.000 2	168.2		3.6	168.4	1.3	99
16	534	2 328	0.23		0.048 2	0.000 8	0.171 4	0.002 7	0.025 8	0.000 2	160.6		2.3	164.2	1.0	97
17	203	798	0.25		0.049 7	0.001 5	0.180 9	0.005 3	0.026 6	0.000 2	168.8		4.6	169.0	1.2	99
18	178	1 022	0.17		0.049 4	0.001 1	0.175 9	0.004 0	0.025 9	0.000 2	164.5		3.5	164.7	1.3	99
19	91	620	0.15		0.050 0	0.001 3	0.177 4	0.004 7	0.025 8	0.000 2	165.8		4.1	164.4	1.5	99
20	6 848	4 583	1.49		0.049 6	0.000 7	0.176 2	0.002 5	0.025 7	0.000 2	164.8		2.2	163.9	1.3	99
21	298	957	0.31		0.051 8	0.001 2	0.183 8	0.004 4	0.025 8	0.000 2	171.4		3.8	164.0	1.5	95
22	517	1 762	0.29		0.053 0	0.001 0	0.188 2	0.003 6	0.025 7	0.000 2	175.1		3.0	163.7	1.4	93

Table 2 Zircon U-Pb dating results of the Wenjiaping granite

点号	含量/10^-6			比值								年龄/Ma				谐和度/%
点号	Th	U		Th/U	²⁰⁷Pb/ ²⁰⁶Pb	±σ	²⁰⁷Pb/ ²³⁵U	±σ	²⁰⁶Pb/ ²³⁸U	±σ		²⁰⁷Pb/ ²³⁵U	±σ	²⁰⁶Pb/ ²³⁸U	±σ	谐和度/%
1	2 480	3 471	0.71		0.052 0	0.000 8	0.184 9	0.002 7	0.025 7	0.000 1	172.3		2.3	163.9	0.9	94
2	776	1 111	0.70		0.049 5	0.001 3	0.189 8	0.005 2	0.027 8	0.000 2	176.5		4.4	176.9	1.5	99
3	245	993	0.25		0.049 6	0.001 1	0.176 2	0.003 8	0.025 8	0.000 2	164.8		3.3	164.3	1.0	99
4	163	857	0.19		0.052 7	0.001 2	0.188 9	0.004 2	0.026 1	0.000 2	175.7		3.6	166.2	1.2	94
5	323	2 101	0.15		0.050 0	0.000 8	0.177 1	0.003 0	0.025 7	0.000 2	165.6		2.6	163.3	1.0	98
6	289	1 256	0.23		0.050 0	0.001 3	0.174 0	0.004 3	0.025 4	0.000 2	162.9		3.7	162.0	1.4	99
7	143	828	0.17		0.047 4	0.001 5	0.171 3	0.005 1	0.026 5	0.000 2	160.5		4.4	168.8	1.5	94
8	343	1 160	0.30		0.049 2	0.001 1	0.173 6	0.003 7	0.025 5	0.000 2	162.5		3.2	162.5	1.0	99
9	408	1 145	0.36		0.049 3	0.001 3	0.177 7	0.004 6	0.026 3	0.000 2	166.1		4.0	167.3	1.3	99
10	209	923	0.23		0.050 2	0.001 8	0.175 9	0.005 8	0.025 9	0.000 2	164.5		5.0	164.5	1.5	99
11	842	3 322	0.25		0.049 0	0.000 7	0.174 6	0.002 4	0.025 8	0.000 1	163.4		2.1	164.1	0.9	99
12	400	1 375	0.29		0.049 4	0.000 9	0.172 3	0.003 2	0.025 3	0.000 1	161.4		2.8	161.3	0.9	99
13	386	954	0.40		0.049 4	0.001 2	0.177 8	0.004 1	0.026 1	0.000 2	166.1		3.5	166.2	1.1	99
14	294	1 284	0.23		0.049 4	0.001 1	0.176 8	0.003 9	0.026 1	0.000 2	165.3		3.3	165.8	1.1	99
15	1 043	1 820	0.57		0.049 4	0.001 1	0.180 1	0.004 2	0.026 5	0.000 2	168.2		3.6	168.4	1.3	99
16	534	2 328	0.23		0.048 2	0.000 8	0.171 4	0.002 7	0.025 8	0.000 2	160.6		2.3	164.2	1.0	97
17	203	798	0.25		0.049 7	0.001 5	0.180 9	0.005 3	0.026 6	0.000 2	168.8		4.6	169.0	1.2	99
18	178	1 022	0.17		0.049 4	0.001 1	0.175 9	0.004 0	0.025 9	0.000 2	164.5		3.5	164.7	1.3	99
19	91	620	0.15		0.050 0	0.001 3	0.177 4	0.004 7	0.025 8	0.000 2	165.8		4.1	164.4	1.5	99
20	6 848	4 583	1.49		0.049 6	0.000 7	0.176 2	0.002 5	0.025 7	0.000 2	164.8		2.2	163.9	1.3	99
21	298	957	0.31		0.051 8	0.001 2	0.183 8	0.004 4	0.025 8	0.000 2	171.4		3.8	164.0	1.5	95
22	517	1 762	0.29		0.053 0	0.001 0	0.188 2	0.003 6	0.025 7	0.000 2	175.1		3.0	163.7	1.4	93

Fig.5 Cathodoluminescent images (a) and U-Pb concordia diagram (b) of zircons in the Wenjiaping granite

Table 3 Zircon Hf isotopic composition of the Wenjiaping granite

点号	年龄/Ma			比值				ε_Hf(t)	T_DM1/Ma	T_DM2/Ma
点号	²⁰⁶Pb/²³⁸U	±σ		¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	±2σ	ε_Hf(t)	T_DM1/Ma	T_DM2/Ma
1	163.9	0.9	0.069 977		0.002 181	0.282 311	0.000 020	-13.0	1 374.8	2 038.2
2	176.9	1.5	0.024 252		0.000 566	0.282 671	0.000 017	0.2	816.7	1 211.3
3	164.3	1.0	0.031 005		0.001 017	0.282 582	0.000 012	-3.3	952.3	1 423.1
4	166.2	1.2	0.030 213		0.000 951	0.282 613	0.000 014	-2.1	906.6	1 351.1
5	163.3	1.0	0.026 248		0.000 770	0.282 630	0.000 016	-1.6	879.5	1 315.0
6	162.0	1.4	0.029 280		0.000 781	0.282 657	0.000 015	-0.7	841.8	1 254.8
7	168.8	1.5	0.012 734		0.000 395	0.282 592	0.000 010	-2.8	923.8	1 395.1
8	162.5	1.0	0.019 514		0.000 672	0.282 568	0.000 010	-3.8	963.8	1 454.4
9	167.3	1.3	0.032 566		0.000 800	0.282 620	0.000 013	-1.9	894.3	1 335.4
10	164.5	1.5	0.053 994		0.001 268	0.282 611	0.000 011	-2.3	917.5	1 359.3
11	164.1	0.9	0.037 519		0.001 379	0.282 598	0.000 011	-2.8	939.3	1 390.5
12	161.3	0.9	0.033 165		0.000 960	0.282 529	0.000 010	-5.2	1 025.4	1 543.9
13	166.2	1.1	0.024 346		0.000 619	0.282 641	0.000 011	-1.1	860.4	1 287.1
14	165.8	1.1	0.018 320		0.000 575	0.282 682	0.000 011	0.3	801.6	1 193.6
15	168.4	1.3	0.086 054		0.002 437	0.282 375	0.000 016	-10.7	1 292.0	1 895.2
16	164.2	1.0	0.024 647		0.000 700	0.282 673	0.000 011	-0.1	817.5	1 216.8
17	169.0	1.2	0.020 896		0.000 680	0.282 446	0.000 012	-8.0	1 133.8	1 724.2
18	164.7	1.3	0.029 550		0.000 883	0.282 590	0.000 013	-3.0	937.9	1 404.3
19	164.4	1.5	0.031 344		0.000 720	0.282 715	0.000 011	1.4	759.1	1 122.0
20	163.9	1.3	0.091 323		0.002 024	0.282 388	0.000 016	-10.3	1 259.3	1 866.8
21	164.0	1.5	0.016 568		0.000 515	0.282 700	0.000 010	0.9	775.3	1 153.7
22	163.7	1.4	0.030 584		0.000 936	0.282 545	0.000 010	-4.6	1 002.1	1 506.0

Fig.6 Plot of εHf(t) vs.206Pb/238U age of the analyzed zircons

Fig.7 K/Al-(2Ca+Na+K)/Al discrimination diagram of alteration effects(the base map after WARREN et al.[33])

Fig.8 Petrogenesis discrimination diagrams of the Wenjiaping granite(the base map after WHALEN et al.[35]和HONG et al.[38])

Fig.9 Mg# vs.SiO2 diagram for the Wenjiaping granite(the base map after JIANG et al. [45])

Fig.10 Tectonic discrimination diagrams of the Wenjiaping granite(the base map after PEARCE et al.[47]and HARRIS et al.[48])

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