藏东吉塘复式花岗岩成因——来自锆石U-Pb年龄和地球化学的证据

樊炳良; 张鑫利; 于涛; 白涛; 冯德新

藏东吉塘复式花岗岩成因——来自锆石U-Pb年龄和地球化学的证据

1.
西藏自治区地质矿产勘查开发局地热地质大队, 西藏拉萨 850000

2.
青海省青藏高原北部地质过程与矿产资源重点实验室, 青海西宁 810012

3.
青海省地质调查院, 青海西宁 810012

4.
西藏大学理学院, 西藏拉萨 850000

5.
成都理工大学地球科学学院, 四川成都 610059

基金项目:
中国地质调查局项目《西藏卡贡地区1：5万四幅区域地质调查》（编号：DD20160016-21）

详细信息

作者简介: 樊炳良(1988-), 男, 助理工程师, 从事固体矿产勘查及区域地质调查工作。E-mail:373705243@qq.com

通讯作者: 张鑫利(1987-), 男, 工程师, 从事地质矿产勘查工作。E-mail:317558467@qq.com

中图分类号: P588.12⁺1;P597⁺.3

收稿日期: 2018-12-19

修回日期: 2019-03-22

刊出日期: 2019-08-15

The genesis of Jitang duplex granites in east Tibet: Evidence from the zircon UPb age and rock geochemistry

1.
Geothermal Geological Survey Party, Tibet Bureau of Geology and Mineral Exploration and Development, Lhasa 850000, Tibet, China

2.
Northern Qinghai-Tibet Plateau Geological Processes and Mineral Resources Laboratory, Qinghai, Xining 810012, Qinghai, China

3.
Qinghai Geological Survey Institute, Xining 810012, Qinghai, China

4.
College of Science, Tibet University, Lhasa 850000, Tibet, China

5.
Department of Geology College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China

More Information

Corresponding author: ZHANG Xinli, 317558467@qq.com

Received Date: 19 December 2018

Revised Date: 22 March 2019

Publish Date: 15 August 2019

摘要

摘要:
吉塘复式花岗岩位于澜沧江岩浆岩带北段，是研究澜沧江结合带演化过程的重要窗口。对澜沧江北段卡贡地区吉塘复式花岗岩中的黑云母二长花岗岩和花岗闪长岩开展了LA-ICP-MS锆石U-Pb年代学、岩石地球化学研究。研究结果表明，所选锆石样品均具有明显的生长环带，Th/U值普遍大于0.4，为典型的岩浆锆石，分别获得锆石²⁰⁶Pb/²³⁸U年龄加权平均值为222.8±1.5Ma（MSWD=1.60，n=16）、213.6±1.1Ma（MSWD=0.98，n=20）和221.1±1.5Ma（MSWD=1.30，n=15），时代均属于晚三叠世。岩石地球化学特征表明，吉塘黑云母二长花岗岩和花岗闪长岩具有较一致的主量、微量元素含量，其变化特征也具有一致性，反映这2类岩石可能为同一期岩浆演化而来；吉塘复式花岗岩属于过铝质S型花岗岩，与临沧花岗岩、纽多花岗岩具有一致的岩石地球化学性质，为澜沧江花岗岩带的重要组成部分，具有统一的构造岩浆活动模式；吉塘复式花岗岩的成因与碰撞造山导致地壳加厚增温及与岩石圈剪切、伸展期有关的深熔作用有关，澜沧江洋的闭合时间可能为273Ma左右。
- 吉塘复式花岗岩 /
- 岩石地球化学特征 /
- LA-ICP-MS锆石U-Pb年龄 /
- 岩石成因
Abstract:
Jitang duplex granites are located in the northern section of the Lancang River magma belt, and serve as an important window for studying the evolution process of Lancang River juncture zone. In this paper, the LA-ICP-MS zircon U-Pb chronology and rock geochemistry of biotite monzonitic granite and granitic diorite in Jitang duplex granites of Kakagong area along northern Lancang River were studied. The results show that the selected zircon samples exhibit obvious growth ring zone, the Th/U ratio is generally higher than 0.4, and the typical magma zircon has average weighted ²⁰⁶Pb/²³⁸U age of 222.8±1.5Ma (MSWD=1.60, n=16), 213.6±1.1Ma (MSWD=0.98, n=20) and 221.1±1.5Ma (MSWD=1.30, n=15), suggesting Late Triassic. The geochemical characteristics of rocks show that the Jitang biotite monzonitic granite and granitic diorite have relatively consistent content of main and trace elements, and their changing characteristics are also consistent. It is shown that these two kinds of rocks might have been derived from the same magma, and the Jitang duplex granites belong to the aluminum S-type granite, which has the same petrogeochemical properties as Lincang granite and Newcastle granite, and has a unified tectonic magmatic activity mode along the Lancang River granite belt. The formation of Jitang duplex granites was related to the thickening and warming of the crust and the deep melting effect related to the shearing and stretching period of lithosphere, with the closure time of Lancang Jiang Ocean was probably at about 273Ma.
- Jitang duplex granites /
- rock geochemical characteristics /
- LA-ICP-MS zircon U-Pb age /
- rock genesis

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图 1 图 1 研究区大地构造位置图（a）和区域地质简图（b）

Figure 1.

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图 2 吉塘复式花岗岩地质简图

Figure 2.

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图 3 吉塘复式花岗岩SiO₂-K₂O（a）和A/CNK-A/NK图解（b）

Figure 3.

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图 4 吉塘复式花岗岩稀土元素球粒陨石标准化配分图（a、c）和微量元素原始地幔标准化蛛网图（b、d）

Figure 4.

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图 5 吉塘复式花岗岩锆石U-Pb谐和图

Figure 5.

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图 6 吉塘复式花岗岩ACF成因类型判别图

Figure 6.

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图 7 吉塘复式花岗岩Al₂O₃/TiO₂-CaO/Na₂O（a）和Rb/Sr-Rb/Ba（b）图解

Figure 7.

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表 1 吉塘复式花岗岩主量、微量和稀土元素分析结果

Table 1. Whole-rock major, trace and rare erath element data of the Jitang duplex granites

元素	JT-1	JT-2	JT-3	JT-4	JT-5	JT-6	JT-7	JT-8	JT-9	JT-10	JT-11	JT-12	JT-13	JT-14	JT-15	JT-16	JT-17	JT-18	JT-19	JT-20
元素	花岗闪长岩			糜棱岩化花岗闪长岩					碎裂岩化花岗闪长岩		黑云母二长花岗岩					糜棱岩化黑云母二长花岗岩			碎裂岩化黑云母二长花岗岩
SiO₂	65.92	64.74	69.06	67.28	67.66	69.50	67.60	66.40	68.00	68.76	69.38	68.98	70.16	71.08	72.70	70.74	69.50	72.60	71.12	75.16
Al₂O₃	15.23	15.98	14.14	14.02	13.46	13.37	14.87	14.89	13.51	14.33	14.53	13.52	13.24	12.97	13.52	13.04	13.21	13.20	12.69	12.26
TFe₂O₃	4.69	4.71	4.03	4.51	4.48	4.88	5.07	4.77	5.09	3.84	2.96	4.01	2.93	4.27	3.70	4.52	4.98	3.39	3.73	2.37
Na₂O	3.04	2.75	4.15	2.69	2.44	3.14	1.82	2.57	2.64	2.84	3.25	2.92	3.16	1.90	2.39	2.36	1.96	2.39	2.24	2.68
K₂O	3.11	3.48	2.40	3.49	3.52	2.14	3.76	3.35	3.09	4.02	4.58	4.26	2.49	3.29	2.60	2.67	3.09	2.85	4.16	4.15
CaO	3.36	0.86	2.38	2.16	2.45	1.47	0.89	2.58	2.02	2.69	1.84	1.59	2.48	1.16	1.08	1.01	1.65	1.36	1.04	0.67
MgO	2.07	2.49	1.61	2.09	2.57	2.57	2.58	2.58	2.76	1.70	1.26	1.98	2.06	2.51	2.07	1.81	1.87	1.70	1.70	0.95
MnO	0.066	0.033	0.042	0.061	0.065	0.064	0.051	0.100	0.046	0.051	0.047	0.069	0.029	0.064	0.044	0.046	0.065	0.054	0.059	0.040
P₂O₅	0.28	0.51	0.20	0.21	0.19	0.14	0.25	0.27	0.17	0.11	0.19	0.12	0.11	0.10	0.10	0.19	0.10	0.082	0.093	0.10
TiO₂	0.76	0.62	0.55	0.70	0.75	0.75	0.70	0.73	0.80	0.64	0.46	0.71	0.92	0.61	0.52	0.64	0.59	0.42	0.51	0.41
烧失量	1.78	3.15	1.98	3.15	2.34	2.56	2.38	1.78	2.35	1.97	1.89	2.45	2.89	2.18	1.89	3.56	3.09	2.01	2.98	1.69
H₂O⁺	1.62	3.06	1.86	2.96	2.22	2.38	2.28	1.54	2.10	1.78	1.76	2.28	2.64	2.08	1.78	3.46	2.80	1.80	2.66	1.66
Na₂O+K₂O	6.15	6.23	6.55	6.18	5.96	5.28	5.58	5.92	5.73	6.86	7.84	7.18	5.65	5.18	5.00	5.03	5.04	5.24	6.41	6.83
Na₂O/K₂O	0.98	0.79	1.73	0.77	0.69	1.47	0.48	0.77	0.85	0.71	0.71	0.69	1.27	0.58	0.92	0.89	0.63	0.84	0.54	0.65
A/NK	1.82	1.93	1.50	1.71	1.72	1.79	2.10	1.89	1.75	1.59	1.41	1.43	1.67	1.94	2.00	1.92	2.01	1.88	1.55	1.38
A/CNK	1.05	1.62	1.03	1.15	1.10	1.32	1.71	1.19	1.19	1.03	1.06	1.10	1.07	1.47	1.55	1.51	1.38	1.39	1.26	1.21
AR	1.99	2.17	2.31	2.23	2.20	2.10	2.10	2.03	2.17	2.35	2.84	2.81	2.12	2.16	2.04	2.12	2.03	2.12	2.75	3.24
Li	22.6	19.5	20.9	22.7	25.1	21.1	33.2	31.7	29.9	17.3	13.6	20.8	11.7	17.7	13.9	15.3	12.7	13.7	17.6	9.7
Be	0.96	2.15	3.56	3.21	3.94	5.22	4.20	3.36	2.02	3.02	3.49	2.69	2.56	3.23	8.13	2.37	4.15	5.14	8.42	2.11
Sc	10.3	11.0	9.3	10.8	11.5	10.7	14.9	17.8	13.8	11.0	9.2	12.0	14.4	14.4	10.1	11.6	12.8	12.1	9.7	5.8
V	86.5	89.0	58.5	72.1	78.1	86.7	94.4	96.7	94.8	70.1	43.6	72.1	79.5	71.5	55.6	63.0	71.6	55.9	62.5	19.4
Cr	37.7	36.4	26.6	43.2	82.3	69.6	80.9	52.6	90.3	33.0	24.5	53.2	61.6	75.8	50.0	61.6	73.7	48.5	49.0	11.3
Co	10.3	11.8	7.9	11.7	12.1	9.2	18.4	13.4	14.1	10.1	7.8	11.5	6.6	12.4	11.7	11.1	15.0	8.8	8.6	4.9
Ni	15.5	22.7	9.9	20.4	33.8	23.6	39.0	18.2	43.7	11.9	9.5	18.5	20.6	30.2	22.6	24.0	31.4	20.8	18.5	7.3
Cu	8.8	4.7	4.4	8.1	12.2	12.2	32.4	10.2	10.1	3.45	7.9	9.7	3.2	2.7	13.2	21.7	31.4	7.5	20.4	10.3
Zn	89.9	62.2	71.7	74.7	69.5	85.0	46.2	68.9	179	61.8	41.0	75.9	18.7	59.6	52.1	60.9	94.4	51.6	66.0	48.6
Ga	20.5	24.1	20.1	21.2	19.1	19.7	22.7	22.8	19.6	18.1	21.8	17.8	21.8	18.8	17.7	17.5	17.5	17.2	17.5	15.0
Rb	180	188	121	199	219	112	213	248	151	181	255	212	32	169	119	139	159	149	195	167
Sr	170	85	124	173	130	149	71	164	118	162	104	125	284	85	93	95	109	87	105	55
Zr	13.20	12.70	11.30	21.90	5.77	17.30	25.90	3.00	2.84	8.95	46.40	22.10	14.30	2.96	5.57	4.35	6.22	14.50	15.90	10.70
Nb	14.7	17.0	17.1	15.7	17.1	15.1	16.8	12.6	17.4	14.7	24.6	14.9	20.4	15.5	9.7	13.3	12.4	11.0	12.7	9.4
Mo	0.40	0.16	0.26	0.29	0.27	0.64	1.39	0.23	0.31	0.21	1.68	0.28	0.69	0.25	1.00	0.61	0.98	0.50	1.28	0.81
Ba	405	416	290	810	804	412	914	674	749	1136	509	821	76.4	664	524	577	698	543	912	430
Hf	0.57	0.17	0.51	1.07	0.53	0.50	0.59	0.13	0.12	0.23	1.02	0.83	0.37	0.12	0.14	0.12	0.20	0.15	0.62	0.18
Ta	2.14	2.02	1.57	1.80	1.16	1.10	1.39	1.44	1.23	0.78	1.86	0.84	1.12	0.82	0.86	0.98	0.74	0.93	1.01	0.68
Pb	47.7	19.8	41.5	56.2	22.4	29.4	18.1	30.8	76.2	17.2	27.6	39.5	9.13	14.3	22.8	22.7	11.1	28.5	32.6	31.2
Bi	0.40	0.62	0.20	0.15	0.27	0.33	0.46	0.35	2.04	0.03	0.47	0.20	0.08	0.16	0.67	0.16	0.13	0.29	0.29	0.02
Th	2.6	3.5	23.7	22.0	24.3	11.7	20.7	11.4	15.5	10.0	26.7	29.3	24.2	10.0	16.9	16.8	14.1	16.3	18.4	17.1
U	3.55	2.76	2.23	4.05	4.42	2.87	4.07	2.34	2.28	1.41	4.79	2.38	2.25	1.59	3.49	3.34	2.70	2.05	4.46	2.05
Y	32.5	44.3	33.2	85.9	46.1	17.5	21.2	20.6	17.6	37.8	72.2	40.5	56.3	30.8	17.6	19.7	51.6	20.3	36.0	27.7
La	46.4	53.8	46.4	106.0	54.1	37.8	41.6	41.3	38.2	48.6	101.0	50.8	66.8	44.8	38.3	40.9	56.7	41.1	48.0	43.4
Ce	78.2	106.0	85.5	188.0	101.0	75.6	79.3	81.1	75.7	90.2	140.0	100.0	117.0	83.0	72.4	76.4	115	79.3	89.3	83.3
Pr	2.57	3.74	8.83	11.00	11.10	8.78	9.32	6.21	9.36	8.77	9.85	13.40	15.20	5.73	8.16	9.06	8.96	8.88	9.94	6.20
Nd	11.2	15.9	34.4	43.1	45.2	34.7	38.9	25.1	34.0	34.6	40.9	50.1	56.6	22.6	32.9	35.8	34.9	33.9	35.4	22.5
Sm	2.63	4.33	6.46	11.00	7.95	6.35	6.60	3.83	6.73	6.24	8.33	8.99	10.20	4.18	5.80	6.25	6.42	6.16	6.59	4.81
Eu	1.11	0.71	1.01	1.42	1.31	1.39	1.26	1.02	1.51	1.29	0.76	1.12	2.11	0.83	0.90	1.09	1.23	0.83	1.06	0.57
Gd	2.54	4.55	6.14	11.90	7.10	5.23	5.50	3.37	5.54	5.53	8.24	7.00	9.11	3.58	4.54	4.83	5.61	4.78	5.74	4.25
Tb	0.56	1.14	1.10	2.43	1.18	0.80	0.77	0.56	0.84	0.97	1.71	1.14	1.53	0.66	0.64	0.76	1.09	0.61	1.01	0.86
Dy	4.53	8.98	7.28	17.00	7.93	6.33	4.44	3.46	4.54	6.69	11.30	6.96	10.70	4.33	3.21	5.47	7.80	3.52	6.72	5.82
Ho	0.90	1.67	1.27	3.12	1.43	0.65	0.76	0.58	0.71	1.16	2.03	1.28	1.97	0.83	0.51	0.71	1.53	0.62	1.15	1.03
Er	2.45	4.68	3.67	8.41	4.73	2.06	1.80	1.26	1.73	3.59	5.41	4.25	6.65	2.92	1.27	2.21	5.17	1.73	3.54	2.77
Tm	0.39	0.71	0.49	1.00	0.56	0.22	0.23	0.14	0.22	0.49	0.56	0.69	0.87	0.29	0.15	0.44	0.76	0.23	0.50	0.35
Yb	2.82	4.28	2.52	5.25	3.06	1.56	1.88	1.82	1.17	2.40	4.74	3.93	4.73	2.50	1.11	1.52	3.98	2.02	2.39	1.73
Lu	0.36	0.63	0.38	0.74	0.48	0.18	0.35	0.39	0.20	0.41	0.69	0.65	0.78	0.38	0.14	0.24	0.73	0.41	0.41	0.28
ΣREE	156.66	210.89	205.45	409.89	247.36	181.73	192.68	170.20	180.46	210.88	335.62	250.67	303.73	176.64	170.10	185.68	249.74	184.07	211.78	177.89
LREE	142.09	184.26	182.60	360.05	220.88	164.71	176.95	158.63	165.49	189.64	300.94	224.77	267.42	161.14	158.53	169.50	223.07	170.16	190.33	160.80
HREE	14.57	26.63	22.85	49.84	26.48	17.02	15.73	11.57	14.96	21.24	34.68	25.89	36.32	15.50	11.58	16.18	26.67	13.91	21.45	17.09
LREE/HREE	9.75	6.92	7.99	7.22	8.34	9.68	11.25	13.71	11.06	8.93	8.68	8.68	7.36	10.40	13.69	10.48	8.36	12.23	8.87	9.41
La_N/Yb_N	11.79	9.01	13.19	14.46	12.67	17.44	15.87	16.30	23.32	14.52	15.26	9.28	10.13	12.83	24.81	19.27	10.21	14.56	14.39	18.02
δEu	1.29	0.48	0.48	0.38	0.52	0.72	0.62	0.85	0.73	0.66	0.28	0.42	0.65	0.64	0.52	0.58	0.61	0.45	0.52	0.37
δCe	1.15	1.30	0.97	1.09	0.96	0.98	0.95	1.11	0.95	0.99	0.87	0.92	0.86	1.09	0.96	0.93	1.13	0.97	0.95	1.10
注：主量元素含量单位为%，微量和稀土元素含量单位为10^-6

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表 2 吉塘复式花岗岩LA-ICP-MS锆石U-Th-Pb分析结果

Table 2. LA-ICP-MS zircon U-Th-Pb analytical data of the Jitang duplex granites

测点号	Pb	Th	U	Th/U	同位素比值						年龄/Ma						Ti/10^-6	T/℃
测点号	10^-6			Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵Pb	1σ	²⁰⁶Pb/²³⁸Pb	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵Pb	1σ	²⁰⁶Pb/²³⁸Pb	1σ	Ti/10^-6	T/℃
D675花岗闪长岩
D675-01	22.01	724.2	593	0.29	0.0514	0.0018	0.2360	0.0079	0.0333	0.0003	257	84.2	215	6.5	211	2.1	4.74	724.2
D675-04	20.26	742.0	560	0.26	0.0503	0.0018	0.2304	0.0081	0.0333	0.0004	209	81.5	211	6.7	211	2.7	5.76	742.0
D675-07	28.39	733.0	724	0.41	0.0504	0.0015	0.2367	0.0073	0.0340	0.0004	213	70.4	216	6.0	215	2.5	5.22	733.0
D675-10	21.70	689.2	582	0.29	0.0505	0.0015	0.2331	0.0073	0.0333	0.0004	220	70.4	213	6.0	211	2.4	3.16	689.2
D675-17	12.06	784.6	314	0.36	0.0503	0.0024	0.2382	0.0114	0.0341	0.0004	209	114	217	9.4	216	2.8	8.92	784.6
D675-22	15.53	785.5	405	0.43	0.0504	0.0020	0.2351	0.0099	0.0337	0.0006	213	92.6	214	8.1	214	3.7	9.00	785.5
D675-24	19.96	738.1	559	0.17	0.0497	0.0017	0.2283	0.0078	0.0332	0.0004	189	79.6	209	6.5	211	2.4	5.51	738.1
D675-26	27.73	710.9	701	0.40	0.0494	0.0021	0.2334	0.0080	0.0338	0.0004	165	98.1	213	6.6	214	2.5	4.08	710.9
D675-02	12.34	797.8	329	0.28	0.0514	0.0021	0.2358	0.0094	0.0333	0.0004	257	94.4	215	7.7	211	2.3	10.15	797.8
D675-03	17.55	646.5	461	0.31	0.0519	0.0019	0.2446	0.0091	0.0341	0.0004	280	83.3	222	7.4	216	2.5	1.86	646.5
D675-05	6.57	804.0	166	0.55	0.0528	0.0036	0.2420	0.0150	0.0338	0.0005	320	158.3	220	12.3	214	3.3	10.77	804.0
D675-11	11.06	688.6	295	0.25	0.0491	0.0020	0.2294	0.0092	0.0339	0.0005	154	101.0	210	7.6	215	2.8	3.14	688.6
D675-21	22.66	701.0	622	0.18	0.0486	0.0015	0.2282	0.0070	0.0339	0.0004	128	72.2	209	5.8	215	2.6	3.64	701.0
D675-13	11.99	881.1	300	0.40	0.0521	0.0028	0.2462	0.0115	0.0340	0.0004	300	122.2	224	9.4	215	2.6	21.38	881.1
D675-09	14.84	790.2	382	0.41	0.0530	0.0020	0.2474	0.0091	0.0338	0.0004	332	85.2	224	7.4	214	2.6	9.42	790.2
D675-12	25.88	744.3	683	0.32	0.0528	0.0015	0.2451	0.0067	0.0335	0.0003	320	63.0	223	5.5	212	2.0	5.90	744.3
D675-08	9.06	786.2	232	0.48	0.0470	0.0024	0.2161	0.0107	0.0332	0.0004	50.1	115.0	199	9.0	211	2.5	9.06	786.2
D675-18	55.40	640.2	1407	0.45	0.0534	0.0015	0.2522	0.0064	0.0340	0.0003	346	61.1	228	5.2	215	2.2	1.71	640.2
D675-23	16.19	734.9	425	0.37	0.0530	0.0018	0.2455	0.0080	0.0334	0.0004	328	106.0	223	6.5	212	2.3	5.33	734.9
D675-06	38.06	689.2	985	0.28	0.0542	0.0015	0.2573	0.0068	0.0344	0.0003	389	60.2	233	5.5	218	1.8	3.16	689.2
D675-16	30.72	645.2	776	0.23	0.0534	0.0015	0.2826	0.0100	0.0378	0.0007	346	63.0	253	7.9	239	4.4	1.82	645.2
D675-25	79.37	731.7	454	0.08	0.1015	0.0020	2.5175	0.1379	0.1734	0.0080	1654	37.0	1277	39.8	1031	44.0	5.15	731.7
D675-19	27.44	786.9	615	0.35	0.0741	0.0021	0.3709	0.0108	0.0360	0.0004	1043	58.2	320	8.0	228	2.3	9.13	786.9
D675-20	47.28	744.9	423	0.09	0.1304	0.0042	2.0534	0.1418	0.1023	0.0051	2103	51.1	1133	47.2	628	30.1	5.93	744.9
D675-15	20.08	766.3	273	0.22	0.1096	0.0065	1.3013	0.1321	0.0668	0.0041	1792	108.0	846	58.3	417	24.8	7.42	766.3
PM13/ZR黑云母二长花岗岩
PM13/ZR-09	33.15	792.8	768	0.54	0.0511	0.0015	0.2531	0.0072	0.0361	0.0004	256	66.7	229	5.9	229	2.4	9.67	792.8
PM13/ZR-14	24.97	709.9	640	0.30	0.0512	0.0016	0.2436	0.0080	0.0349	0.0004	250	74.1	221	6.5	221	2.4	4.03	709.9
PM13/ZR-17	33.01	753.4	791	0.57	0.0505	0.0015	0.2407	0.0069	0.0347	0.0004	217	66.7	219	5.7	220	2.3	6.49	753.4
PM13/ZR-18	47.62	710.2	1200	0.25	0.0501	0.0021	0.2437	0.0099	0.0352	0.0003	198	99.1	221	8.1	223	2.1	4.04	710.2
PM13/ZR-20	30.56	761.3	731	0.47	0.0504	0.0015	0.2432	0.0072	0.0349	0.0004	213	68.5	221	5.9	221	2.5	7.05	761.3
PM13/ZR-21	76.22	685.5	1975	0.15	0.0499	0.0010	0.2434	0.0052	0.0351	0.0003	191	48.1	221	4.2	223	1.8	3.03	685.5
PM13/ZR-08	24.04	702.9	592	0.43	0.0497	0.0016	0.2424	0.0082	0.0354	0.0004	183	77.8	220	6.7	224	2.4	3.72	702.9
PM13/ZR-15	38.15	742.8	973	0.30	0.0499	0.0014	0.2366	0.0067	0.0346	0.0003	191	64.8	216	5.5	219	2.1	5.80	742.8
PM13/ZR-19	52.40	766.6	1158	0.72	0.0494	0.0014	0.2459	0.0071	0.0359	0.0003	165	68.5	223	5.8	228	2.2	7.44	766.6
PM13/ZR-23	37.16	708.0	932	0.20	0.0497	0.0014	0.2411	0.0067	0.0351	0.0003	189	66.7	219	5.5	222	1.8	3.94	708.0
PM13/ZR-02	52.72	616.0	1363	0.25	0.0490	0.0012	0.2380	0.0062	0.0352	0.0004	146	59.3	217	5.1	223	2.2	1.23	616.0
PM13/ZR-11	17.18	808.6	405	0.59	0.0538	0.0021	0.2553	0.0099	0.0348	0.0003	361	91.7	231	8.0	221	2.1	11.25	808.6
PM13/ZR-25	43.13	758.0	1044	0.46	0.0528	0.0016	0.2551	0.0082	0.0348	0.0004	317	65.7	231	6.6	221	2.3	6.82	758.0
PM13/ZR-24	68.40	759.3	1429	0.84	0.0538	0.0015	0.2643	0.0066	0.0356	0.0004	361	65.7	238	5.3	225	2.3	6.90	759.3
PM13/ZR-10	40.40	634.0	973	0.36	0.0550	0.0016	0.2701	0.0074	0.0360	0.0004	413	64.8	243	6.0	228	2.5	1.57	634.0
PM13/ZR-13	22.65	745.5	558	0.30	0.0568	0.0021	0.2730	0.0097	0.0356	0.0005	483	47.2	245	7.8	225	3.0	5.9	745.5
PM13/ZR-04	28.76	777.0	720	0.51	0.0494	0.0015	0.2295	0.0070	0.0337	0.0003	165	70.4	210	5.8	214	2.1	8.27	777.0
PM13/ZR-06	256.00	727.9	787	0.63	0.0959	0.0016	3.4074	0.0769	0.2565	0.0040	1546	31.5	1506	17.7	1472	20.6	4.93	727.9
PM13/ZR-12	67.68	781.2	365	0.29	0.0749	0.0020	1.6247	0.0419	0.1600	0.0017	1066	54.8	980	16.2	957	9.4	8.63	781.2
PM13/ZR-03	45.30	827.1	879	0.96	0.1507	0.0072	0.8650	0.0525	0.0392	0.0007	2353	81.0	633	28.6	248	4.3	13.36	827.1
D6082糜棱岩化花岗闪长岩
D6082-01	33.23	707.7	856	0.28	0.0517	0.0015	0.2423	0.0069	0.0331	0.0004	272	63.9	220	5.7	210	2.3	3.93	707.7
D6082-17	144.90	785.7	3701	0.22	0.0525	0.0011	0.2489	0.0057	0.0343	0.0004	309	54.6	226	4.7	217	2.3	9.02	785.7
D6082-02	39.78	866.5	952	0.40	0.0489	0.0014	0.2357	0.0065	0.0349	0.0004	143	66.7	215	5.4	221	2.4	18.90	866.5
D6082-03	18.55	777.5	439	0.44	0.0527	0.0018	0.2556	0.0084	0.0351	0.0004	322	75.9	231	6.8	222	2.4	8.32	777.5
D6082-04	29.18	743.2	764	0.15	0.0521	0.0016	0.2525	0.0086	0.0349	0.0006	300	72.2	229	7.0	221	3.5	5.83	743.2
D6082-05	28.36	745.7	716	0.29	0.0519	0.0017	0.2502	0.0083	0.0348	0.0004	280	71.3	227	6.7	221	2.7	5.99	745.7
D6082-06	39.50	772.1	937	0.58	0.0529	0.0016	0.2551	0.0082	0.0348	0.0005	324	68.5	231	6.6	220	2.9	7.88	772.1
D6082-07	17.73	806.0	414	0.50	0.0506	0.0021	0.2467	0.0093	0.0355	0.0004	233	96.3	224	7.6	225	2.5	10.98	806.0
D6082-09	44.09	693.3	1095	0.35	0.0504	0.0014	0.2445	0.0070	0.0351	0.0004	213	66.7	222	5.8	222	2.3	3.32	693.3
D6082-10	44.26	711.7	1058	0.47	0.0518	0.0012	0.2511	0.0060	0.0351	0.0004	276	53.7	227	4.9	222	2.2	4.12	711.7
D6082-11	38.78	730.6	960	0.37	0.0489	0.0015	0.2319	0.0068	0.0343	0.0003	146	70.4	212	5.6	217	2.1	5.09	730.6
D6082-15	53.90	791.3	1293	0.48	0.0507	0.0012	0.2401	0.0057	0.0344	0.0003	228	57.4	218	4.7	218	1.8	9.53	791.3
D6082-16	46.31	669.7	1085	0.40	0.0530	0.0013	0.2611	0.0067	0.0356	0.0003	332	57.4	236	5.4	226	2.2	2.50	669.7
D6082-18	25.29	780.3	574	0.61	0.0519	0.0016	0.2533	0.0084	0.0353	0.0004	280	72.2	229	6.8	223	2.7	8.55	780.3
D6082-19	49.99	666.9	1274	0.32	0.0509	0.0025	0.2438	0.0110	0.0350	0.0005	239	113.0	222	9.0	222	2.8	2.41	666.9
D6082-20	20.81	688.5	560	0.04	0.0510	0.0014	0.2456	0.0081	0.0349	0.0007	239	64.8	223	6.6	221	4.3	3.14	688.5
D6082-12	47.80	607.4	993	0.53	0.0511	0.0014	0.2788	0.0076	0.0395	0.0004	256	58.3	250	6.0	250	2.4	1.09	607.4
D6082-08	54.50	640.0	659	0.35	0.0584	0.0013	0.5767	0.0173	0.0714	0.0016	543	48.1	462	11.2	445	9.4	1.70	640.0
D6082-14	52.82	747.3	396	0.24	0.0741	0.0016	1.4245	0.0580	0.1378	0.0046	1043	43.7	899	24.3	832	26.0	6.09	747.3
D6082-13	48.80	682.9	204	0.96	0.0738	0.0018	1.8201	0.0458	0.1787	0.0017	1035	50.8	1053	16.5	1060	9.3	2.94	682.9

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藏东吉塘复式花岗岩成因——来自锆石U-Pb年龄和地球化学的证据

作者简介: 樊炳良(1988-), 男, 助理工程师, 从事固体矿产勘查及区域地质调查工作。E-mail:373705243@qq.com

通讯作者: 张鑫利(1987-), 男, 工程师, 从事地质矿产勘查工作。E-mail:317558467@qq.com

The genesis of Jitang duplex granites in east Tibet: Evidence from the zircon UPb age and rock geochemistry

Corresponding author: ZHANG Xinli, 317558467@qq.com

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