松潘—甘孜造山带南缘江浪穹窿文家坪花岗岩成因及地质意义

doi:10.19657/j.geoscience.1000-8527.2018.01.02

现代地质 ›› 2018, Vol. 32 ›› Issue (01): 16-27.DOI: 10.19657/j.geoscience.1000-8527.2018.01.02

松潘—甘孜造山带南缘江浪穹窿文家坪花岗岩成因及地质意义

朱玉娣¹(), 代堰锫²(), 王丽丽³, 李同柱², 张惠华², 沈战武²

1.西南石油大学地球科学与技术学院,四川成都 610500
2.中国地质调查局成都地质调查中心,四川成都 610081
3.中国地质大学(北京) 期刊中心,北京 100083

收稿日期:2017-01-15 修回日期:2017-05-06 出版日期:2018-02-10 发布日期:2018-02-05
通讯作者: 代堰锫,男,工程师,博士,1986年出生,矿物学、岩石学、矿床学专业,主要从事岩石学与矿床学研究工作。Email:diyeplas@foxmail.com。
作者简介:代堰锫,男,工程师,博士,1986年出生,矿物学、岩石学、矿床学专业,主要从事岩石学与矿床学研究工作。Email:diyeplas@foxmail.com。
朱玉娣,女,讲师,博士,1986年出生,矿物学、岩石学、矿床学专业,主要从事岩石成因研究工作。Email:420132343@qq.com。
基金资助:
西南石油大学青年教师“过学术关”项目(201499010083);西南石油大学科研启航计划项目(2015QHZ009);四川省教育厅科研项目(15ZB0058)

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

ZHU Yudi¹(), DAI Yanpei²(), WANG Lili³, LI Tongzhu², ZHANG Huihua², SHEN Zhanwu²

1. School of Geoscience and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China
2. Chengdu Center,China Geological Survey,Chengdu,Sichuan 610081,China
3. Journal Center,China University of Geosciences,Beijing 100083,China

Received:2017-01-15 Revised:2017-05-06 Online:2018-02-10 Published:2018-02-05

摘要/Abstract

摘要：

为厘定江浪穹窿文家坪花岗岩的侵位时代并探讨岩石成因,开展了地球化学、锆石U-Pb年代学和Hf同位素研究。文家坪花岗岩岩性为黑云母花岗岩,由石英(约40%)、钾长石(约35%)、黑云母(约15%)及斜长石(<10%)等矿物组成。主微量元素分析表明,江浪穹窿文家坪花岗岩具有高的SiO₂含量(67.70%~70.09%)、Na₂O+K₂O含量(7.43%~7.84%)、Zr+Nb+Ce+Y含量(363×10^-6~476×10^-6)、Mg^#指数(35.9~38.7)及10 000×Ga/Al比值(2.58~2.84),显示右倾的稀土配分型式,富集大离子亲石元素、亏损高场强元素。锆石U-Pb定年与Hf同位素示踪表明,花岗岩结晶年龄为(164.6±0.9) Ma(n=21,MSWD=3.2),ε_Hf(t)值介于-13.0~+1.4之间。综合研究提出,文家坪花岗岩属后造山A2型花岗岩,形成于岩石圈伸展构造背景,岩浆源区主要为江浪穹窿核部的中元古界里伍岩群及少量的幔源物质。结合其他地质成果,认为江浪穹窿成穹时代为早—中侏罗世,且区域Cu、W成矿作用很可能与约165 Ma花岗质岩浆活动具有成因联系。

关键词: 松潘—甘孜造山带, 江浪穹窿, A2型花岗岩, 岩石成因

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

中图分类号:

P581
P597

朱玉娣, 代堰锫, 王丽丽, 李同柱, 张惠华, 沈战武. 松潘—甘孜造山带南缘江浪穹窿文家坪花岗岩成因及地质意义[J]. 现代地质, 2018, 32(01): 16-27.

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.

图/表 13

图1 江浪穹窿大地构造位置及区域地质图(修改自文献[10])

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

图2 江浪穹窿地层与文家坪花岗岩的野外及镜下特征 (a)里伍岩群中发育左行剪切的石英脉;(b)二叠系与三叠系之间的韧性剪切带;(c)文家坪岩体与里伍岩群的断层接触关系;(d)文家坪花岗岩的似斑状构造;(e)花岗岩显微照片(正交偏光);(f)花岗岩显微照片(单偏光)

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

表1 文家坪花岗岩主量(wB/%)及微量元素(wB/10-6)分析结果

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

表1 文家坪花岗岩主量(wB/%)及微量元素(wB/10-6)分析结果

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

图3 文家坪花岗岩TAS及K2O-SiO2图解(底图分别据MIDDLEMOST[27]和PECCERILLO等[28])

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

图4 文家坪花岗岩稀土元素配分型式图(a)和微量元素蛛网图(b)(球粒陨石、原始地幔和里伍岩群数据分别据文献TAYLOR等[29] 、SUN等[30]和李同柱等[31])

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)

表2 文家坪花岗岩锆石U-Pb定年结果

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

表2 文家坪花岗岩锆石U-Pb定年结果

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

图5 文家坪花岗岩锆石阴极发光照片(a)及U-Pb年龄谐和图(b)

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

表3 文家坪花岗岩锆石Hf同位素组成

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

图6 锆石εHf(t)-206Pb/238U年龄图解

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

图7 K/Al-(2Ca+Na+K)/Al蚀变判别图解(底图据WARREN等[33])

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

图8 文家坪花岗岩成因类型判别图解(底图据WHALEN等[35]和洪大卫等[38])

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

图9 文家坪花岗岩Mg#-SiO2图解(底图据JIANG 等[45];1 bar=105 Pa)

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

图10 文家坪花岗岩构造环境判别图解(底图分别据PEARCE等[47]和HARRIS等[48])

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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松潘—甘孜造山带南缘江浪穹窿文家坪花岗岩成因及地质意义

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

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