青海阿尼玛卿蛇绿混杂岩带西段哥日卓托杂岩体年代学、地球化学及Hf同位素

刘金龙; 孙丰月; 李良; 赵菲菲; 王英德; 王硕; 张宇婷

doi:10.3799/dqkx.2015.081

青海阿尼玛卿蛇绿混杂岩带西段哥日卓托杂岩体年代学、地球化学及Hf同位素

doi: 10.3799/dqkx.2015.081

吉林大学地球科学学院，吉林长春 130061

基金项目:

中国地质调查局项目“柴达木周缘及邻区成矿带地质矿产调查评价” 1212011086020

详细信息

作者简介:
刘金龙(1988-)，男，博士研究生，主要从事矿床学研究.E-mail: liujinlong0815@yeah.net

通讯作者:
孙丰月(1963-)，E-mail: sfy@jlu.edu.cn

中图分类号: P581
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出版历程
- 收稿日期: 2014-09-15
- 刊出日期: 2015-06-15

Geochronology, Geochemistry and Hf Isotopes of Gerizhuotuo Complex Intrusion in West of Anyemaqen Suture Zone

College of Earth Sciences, Jilin University, Changchun 130061, China

摘要

摘要: 布青山构造混杂岩带中的哥日卓杂岩体与区域构造线方向不一致，属于典型的“钉合岩体”，对限定地体拼贴或增生的时间上限具有特殊的构造年代学意义.锆石LA-ICP-MS U-Pb定年结果显示岩体形成于晚三叠世中期(似斑状花岗岩形成于227 Ma，闪长岩形成于224 Ma).在地球化学上，似斑状花岗岩为高钾钙碱性系列，高Sr(479~573 μg/g)，低Yb(1.03~1.20 μg/g)，Mg^#值为48.7~51.8，判断岩石属于埃达克岩类.岩石的ε_Hf(t)值为-2.40~2.98，判断岩石源于加厚陆壳部分熔融.闪长岩Ti/Yb值为1 930~2 178，Nb/Ta值为15.9~17.4，属混合成因.综合前人研究成果，哥日卓托杂岩体形成于古特提斯洋闭合后碰撞环境，并且标志同碰撞到后碰撞的构造体制转换.
- 锆石U-Pb年龄 /
- 锆石Hf同位素 /
- 埃达克岩 /
- 地球化学 /
- 地质年代学
Abstract: The Gerizhuotuo complex intrusion, a typical 'stitching pluton' with its long axis cutting regional structural lines, is significant in tectonic geochronology for providing an upper-age for the timing of plate collision. The zircon U-Pb dating results indicate that the pluton was formed in 227-224 Ma. Geochemically, porphyritic granite falls into the high-K calc-alkaline series, with high Sr(479-573 μg/g) and low Yb(1.03-1.20 μg/g) and Mg^#(48.7-51.8), being of the characteristics of adakitic rocks. The in situ zircon ε_Hf(t) value varies from -2.40 to 2.98, which suggests that the primary magma was derived from partial melting of lower crustal materials. Diorite also shows high-K calc-alkaline affinitie, with a Ti/Yb ratio ranging from 1 930 to 2 178, Nb/Ta ratio ranging from 15.9 to 17.4. It is suggested that a mixture, between basaltic magma derived from partial melting of metasomatized mantle and acidic magma derived from crustal material, produced the dioritic magma. It is concluded that the pluton was formed in a post-collisional tensional environment.
- zircon U-Pb age /
- zircon Hf isotope /
- adakiteic rock /
- geochemistry /
- geochronology

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图 1 研究区地质略图

a.据李瑞宝，2012；李佐臣等，2013修改；b.据孙丰月等，2003.1.第四系；2.中下二叠统马尔争组；3.上石炭统-中下二叠统树维门科组；4.石炭纪哥日卓托洋岛灰岩；5.石炭纪蛇纹岩；6.石炭纪辉长岩；7.石炭纪玄武岩；8.三叠纪哥日卓托杂岩体；9.三叠纪似斑状花岗岩；10.志留纪花岗闪长岩；11.断层；12.地质界线；13.取样位置；14.香加南山岩体；15.哈拉尕吐花岗岩体；16.诺木洪花岗岩体；17.玛积雪山地区弧火山岩；18.白日其利地区基性岩墙群

Fig. 1. Geological sketch map of the study area

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图 2 似斑状花岗岩和闪长岩的显微照片

Pl.斜长石；Q.石英；Pyr.辉石；Amp.角闪石；Bt.黑云母；Ap.磷灰石；Chl.绿泥石

Fig. 2. Microphotographs of the porphyritic granite and diorite rocks

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图 3 哥日卓托杂岩体部分锆石阴极发光图像

Fig. 3. CL images of zircons from the rocks in Gerizhuotuo complex intrusion

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图 4 哥日卓托杂岩体似斑状花岗岩(a)、闪长岩(b)的U-Pb年龄协和图及其TAS图解(c)和SiO₂-K₂O图解(d)

图c中分界线上方为碱性，下方为亚碱性，据Irvine and Baragar(1971)

Fig. 4. Zircon U-Pb concordia diagram for porphyritic granite (a) and diorite (b) in Gerizhuotuo complex intrusion, and TAS diagram (c) and K₂O-SiO₂ diagram (d) of the rocks in Gerizhuotuo complex intrusion

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图 5 哥日卓托杂岩体稀土元素球粒陨石标准化配分图解(a)和原始地幔标准化蛛网图(b)

图a据Boynton, 1984；图b据Sun and McDonough, 1989

Fig. 5. Chondrte-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagrams (b) of the rocks in Gerizhuotuo complex intrusion

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图 6 哥日卓托杂岩体的MgO-FeO^T图解

Fig. 6. MgO-FeO^T relation of the rocks in Gerizhuotuo complex intrusion

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图 7 似斑状花岗岩的Hf同位素特征(据吴福元等，2007)

Fig. 7. Hf isotopic compositions of porphyritic granite

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图 8 似斑状花岗岩Sr/Y-Y图解(Defant and Drummond, 1990)

Fig. 8. Sr/Y-Y relation of porphyritic granite

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图 9 闪长岩Nb/Y-Th/Y图解(a)和Nb-Th/Th图解(b)

Fig. 9. Nb/Y-Th/Y diagram (a) and Nb-Th/Th diagram (b) for the diorite rocks

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图 10 哥日卓托杂岩体的(Ta+Yb)-Rb图解(a)(Pearce et al., 1984)和(Y+Nb)-Rb图解(b)(Pearce, 1996)

Fig. 10. (Ta+Yb) vs Rb (a) and (Y+Nb) vs Rb (b) of the rocks in Gerizhuotuo complex intrusion

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图 11 似斑状花岗岩R₁-R₂判别图解(a)(Bachelor and Bowden, 1985)和闪长岩FeO^T-MgO-Al₂O₃判别图解(b)(Brown and Thorpe, 1984)

Fig. 11. R₁-R₂ factor discrimination of porphyritic granite (a) and FeO^T-MgO-Al₂O₃ relations of diorite (b)

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表 1 哥日卓托似斑状花岗岩锆石LA-ICP-MS U-Pb同位素分析结果

Table 1. LA-ICP-MS zircon U-Pb analyses of porphyritic granite

测点	含量(10^-6)			同位素比值及误差						年龄(Ma)及误差
测点	²³⁸U	²³²Th	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
GR-N3-1	774	358	0.46	0.462 4	0.054 0	0.001 8	0.267 2	0.008 6	0.035 7	372	72	240	7	226	2
GR-N3-2	525	229	0.44	0.436 1	0.052 9	0.001 9	0.261 4	0.009 2	0.035 9	328	81	236	7	227	2
GR-N3-3	345	184	0.53	0.533 1	0.051 0	0.002 7	0.252 2	0.012 7	0.035 9	239	122	228	10	227	3
GR-N3-4	925	420	0.45	0.454 4	0.052 3	0.001 9	0.260 0	0.009 1	0.035 8	298	86	235	7	227	2
GR-N3-5	736	350	0.48	0.475 8	0.051 4	0.002 2	0.255 3	0.010 3	0.035 9	257	92	231	8	227	3
GR-N3-6	676	309	0.46	0.457 2	0.051 2	0.002 3	0.256 0	0.012 5	0.035 7	250	104	231	10	226	4
GR-N3-7	848	388	0.46	0.457 0	0.051 5	0.002 1	0.257 2	0.010 1	0.036 0	265	93	232	8	228	3
GR-N3-8	678	302	0.45	0.446 1	0.051 1	0.001 6	0.252 0	0.007 7	0.035 8	256	72	228	6	227	3
GR-N3-9	672	320	0.48	0.476 0	0.054 8	0.002 1	0.272 5	0.010 5	0.035 8	406	83	245	8	227	2
GR-N3-10	445	214	0.48	0.479 9	0.051 7	0.002 0	0.256 5	0.009 8	0.035 8	333	89	232	8	227	2
GR-N3-11	640	309	0.48	0.482 2	0.052 5	0.002 0	0.261 2	0.009 9	0.036 0	309	85	236	8	228	3
GR-N3-12	444	209	0.47	0.471 4	0.052 1	0.002 9	0.258 6	0.014 3	0.036 0	300	125	234	12	228	3
GR-N3-13	668	320	0.48	0.478 2	0.051 0	0.003 0	0.255 1	0.014 4	0.036 1	243	135	231	12	229	3
GR-N3-14	464	320	0.69	0.688 8	0.057 4	0.002 0	0.581 7	0.021 4	0.072 7	506	81	466	14	453	4
GR-N3-15	592	131	0.22	0.222 0	0.152 1	0.002 9	5.804 9	0.104 5	0.274 6	2 369	31	1 947	16	1 564	9

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表 2 哥日卓托闪长岩锆石LA-ICP-MS U-Pb同位素分析结果

Table 2. LA-ICP-MS zircon U-Pb analyses of diorite in Gerizhuotuo complex intrusion

测点	含量(10^-6)			同位素比值及误差						年龄(Ma)及误差
测点	²³⁸U	²³²Th	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
GR-N6-1	347	203	0.58	0.053 4	0.004 7	0.258 1	0.023 5	0.035 1	0.001 6	344	188	233	19	222	10
GR-N6-2	457	258	0.56	0.050 6	0.002 1	0.244 5	0.012 2	0.035 1	0.001 5	220	94	222	10	222	9
GR-N6-3	492	407	0.83	0.049 4	0.002 0	0.231 8	0.011 4	0.034 0	0.001 4	165	93	212	9	216	9
GR-N6-4	473	382	0.81	0.051 5	0.002 1	0.242 2	0.011 9	0.034 1	0.001 4	261	92	220	10	216	9
GR-N6-5	412	207	0.50	0.048 6	0.004 0	0.238 2	0.020 2	0.035 6	0.001 6	128	181	217	17	225	10
GR-N6-6	309	231	0.75	0.049 1	0.003 1	0.238 4	0.016 0	0.035 2	0.001 5	153	139	217	13	223	9
GR-N6-7	183	124	0.68	0.049 6	0.003 7	0.242 7	0.019 0	0.035 5	0.001 5	176	164	221	16	225	10
GR-N6-8	240	139	0.58	0.052 9	0.007 7	0.266 3	0.038 6	0.036 5	0.001 9	325	300	240	31	231	12
GR-N6-9	313	146	0.47	0.049 9	0.003 3	0.249 2	0.017 8	0.036 2	0.001 5	192	148	226	14	229	10
GR-N6-10	223	111	0.50	0.051 8	0.003 2	0.252 6	0.017 0	0.035 4	0.001 5	277	136	229	14	224	9
GR-N6-11	268	243	0.91	0.051 4	0.004 4	0.251 4	0.022 2	0.035 5	0.001 6	261	184	228	18	225	10
GR-N6-12	362	168	0.46	0.049 2	0.002 2	0.241 1	0.012 8	0.035 6	0.001 5	155	102	219	10	226	9
GR-N6-13	381	254	0.67	0.050 9	0.006 1	0.247 1	0.029 9	0.035 3	0.001 7	235	255	224	24	223	11
GR-N6-14	384	213	0.56	0.049 0	0.002 2	0.240 0	0.012 5	0.035 6	0.001 5	148	101	218	10	225	9
GR-N6-15	306	144	0.47	0.048 7	0.002 8	0.238 5	0.014 9	0.035 5	0.001 5	134	128	217	12	225	9
GR-N6-16	657	564	0.86	0.051 6	0.002 2	0.256 0	0.012 9	0.036 1	0.001 5	266	94	231	10	228	9
GR-N6-17	495	466	0.94	0.052 1	0.002 4	0.251 0	0.013 4	0.035 0	0.001 5	290	101	227	11	222	9
GR-N6-18	313	153	0.49	0.052 5	0.005 1	0.262 0	0.026 2	0.036 3	0.001 6	306	208	236	21	230	10
GR-N6-19	421	209	0.50	0.051 7	0.005 8	0.250 5	0.028 3	0.035 3	0.001 6	272	236	227	23	223	10
GR-N6-20	263	151	0.57	0.051 7	0.008 2	0.248 7	0.039 2	0.035 0	0.001 8	271	326	226	32	222	11
GR-N6-21	400	248	0.62	0.049 5	0.007 0	0.239 8	0.033 8	0.035 3	0.001 7	171	298	218	28	223	11
GR-N6-22	263	237	0.90	0.052 8	0.002 9	0.250 3	0.015 5	0.034 5	0.001 4	320	121	227	13	219	9
GR-N6-23	656	529	0.81	0.050 6	0.003 7	0.244 3	0.019 1	0.035 1	0.001 5	223	162	222	16	223	9

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表 3 哥日卓托似斑状花岗岩和闪长岩主量元素、稀土元素和微量元素含量及有关参数

Table 3. Major, REE and trace element content and parameter of the rocks in Gerizhuotuo complex intrusion

样品	似斑状花岗岩								闪长岩
样品	GR-Y3-1	GR-Y3-2	GR-Y3-3	GR-Y3-4	GR-Y3-5	GR-Y3-6	GR-Y3-7	GR-Y3-8	GR-Y6-1	GR-Y6-2	GR-Y6-3	GR-Y6-4	GR-Y6-5	GR-Y6-6	GR-Y6-7	GR-Y6-8
SiO₂	68.52	67.19	68.82	67.93	68.04	67.54	67.52	68.31	57.32	57.39	58.19	57.56	56.18	57.87	57.11	57.99
TiO₂	0.38	0.42	0.43	0.40	0.40	0.42	0.40	0.39	0.78	0.78	0.76	0.76	0.78	0.79	0.76	0.75
Al₂O₃	15.81	16.15	16.54	15.91	16.13	16.18	15.98	15.83	17.18	17.28	16.96	16.98	16.86	16.98	16.58	16.71
FeO	2.56	2.59	2.66	2.51	2.40	2.38	2.32	2.38	5.29	5.74	5.27	4.86	5.34	5.33	5.31	5.49
Fe₂O₃	0.22	0.48	0.49	0.55	0.48	0.60	0.51	0.46	1.59	1.27	1.39	2.39	1.86	1.50	1.78	1.29
Fe₂O₃^T	3.06	3.36	3.45	3.34	3.15	3.24	3.09	3.11	7.47	7.65	7.25	7.80	7.79	7.42	7.68	7.39
MnO	0.06	0.07	0.07	0.08	0.07	0.07	0.07	0.08	0.14	0.15	0.14	0.14	0.15	0.15	0.15	0.15
MgO	1.51	1.73	1.77	1.60	1.65	1.74	1.67	1.62	4.59	4.79	4.28	4.21	5.56	4.59	5.76	4.36
CaO	2.62	3.38	3.47	2.79	2.36	3.08	2.72	2.56	6.55	6.20	6.30	6.73	7.17	6.24	5.94	6.67
Na₂O	4.02	4.13	4.23	4.04	4.23	4.16	4.15	4.04	3.30	3.31	3.33	3.31	3.16	3.37	3.31	3.34
K₂O	3.74	3.26	3.34	3.61	3.68	3.26	3.63	3.78	2.27	2.03	2.41	2.15	1.96	2.21	2.25	2.30
P₂O₅	0.16	0.17	0.18	0.16	0.15	0.17	0.16	0.16	0.30	0.31	0.28	0.29	0.31	0.29	0.29	0.28
LOI	2.26	2.80	2.36	2.32	2.42	2.89	2.65	2.52	2.12	2.28	1.75	1.54	1.62	2.01	3.05	1.23
Mg^#	49.51	50.44	50.44	48.66	50.95	51.52	51.75	50.81	54.89	55.34	53.94	51.70	58.58	55.08	59.74	53.91
Cr	39.2	43.2	52.5	53.9	42.8	49.5	47.1	46.4	53.4	88.3	82.5	100.0	136.0	88.4	149.0	81.1
V	28.5	41.4	44.0	42.0	39.4	46.4	36.1	39.4	118.0	138.0	139.0	148.0	144.0	136.0	141.0	132.0
Rb	140.0	129.0	118.0	144.0	136.0	130.0	149.0	143.0	82.7	78.0	91.3	79.5	68.1	82.8	89.0	78.6
Ba	791	780	776	855	1 032	844	723	891	710	648	670	698	661	685	671	648
Sr	480	490	573	521	479	514	535	485	609	608	594	575	562	603	599	517
Ce	79.1	78.3	78.3	87.5	78.2	87.4	73.1	83.4	82.8	84.6	94.2	94.4	82.0	90.1	82.5	91.6
Pr	7.91	8.17	7.98	8.97	8.29	8.83	7.45	8.26	9.08	9.28	10.2	10.1	9.04	9.75	8.93	9.63
Nb	18.1	19.6	20.4	19.9	19.4	19.4	20.1	19.3	22.3	21.8	24.0	25.5	21.4	23.0	19.9	23.0
Ta	1.42	1.53	1.34	1.55	1.47	1.52	1.41	1.62	1.38	1.26	1.42	1.47	1.27	1.38	1.25	1.45
Th	16.80	13.10	15.80	17.00	14.00	13.70	15.10	16.90	9.73	9.94	11.90	11.10	8.83	10.90	10.70	11.90
U	3.41	2.91	3.26	3.27	2.99	2.74	2.75	3.64	2.76	2.85	3.31	2.67	2.32	3.71	2.47	3.12
La	48.2	50.5	47.1	56.8	52.3	56.4	38.8	52.8	49.1	50.2	55.3	55.5	47.8	54.2	47.5	54.6
Nd	26.8	27.3	25.7	29.3	26.9	29.5	26.4	27.6	34.2	34.3	37.5	38.2	34.1	35.8	32.3	35.7
Sm	3.82	3.96	4.04	4.31	4.07	4.50	3.82	3.96	5.69	5.68	5.65	6.29	5.81	6.27	5.14	6.15
Eu	0.92	1.02	1.08	1.11	0.89	1.11	0.84	0.93	1.49	1.42	1.38	1.56	1.55	1.41	1.27	1.44
Gd	3.24	3.29	3.69	3.64	3.53	3.55	3.45	3.35	5.66	5.01	5.45	5.51	5.25	5.12	4.75	5.05
Tb	0.441	0.488	0.461	0.473	0.488	0.535	0.415	0.501	0.816	0.788	0.815	0.889	0.805	0.828	0.829	0.821
Dy	2.06	2.36	2.18	2.32	1.94	2.18	2.19	2.26	4.02	3.97	4.48	4.55	4.03	4.08	3.96	4.22
Ho	0.362	0.436	0.39	0.409	0.375	0.429	0.409	0.404	0.795	0.788	0.826	0.841	0.783	0.79.0	0.781	0.826
Er	1.04	1.17	1.17	1.16	1.09	1.18	1.16	1.16	2.21	2.38	2.49	2.35	2.26	2.28	2.15	2.42
Tm	0.161	0.170	0.171	0.174	0.171	0.177	0.154	0.178	0.352	0.338	0.349	0.362	0.337	0.358	0.328	0.353
Yb	1.03	1.20	1.09	1.15	1.07	1.13	1.13	1.12	2.27	2.25	2.29	2.34	2.21	2.21	2.08	2.32
Lu	0.158	0.172	0.157	0.164	0.159	0.163	0.146	0.172	0.345	0.342	0.341	0.349	0.317	0.340	0.320	0.340
Y	10.3	11.3	10.8	11.1	10.4	11.3	11.3	11.0	20.2	19.7	21.8	21.9	19.7	21.2	19.1	21.3
Li	34.7	42.3	44.8	38.3	39.0	44.7	38.8	33.6	23.5	23.7	22.0	16.1	23.0	23.4	26.8	17.2
Be	2.24	2.56	2.80	2.60	2.56	2.57	2.63	2.34	1.67	1.59	2.12	1.78	1.50	1.67	1.59	1.75
Sc	5.01	5.65	5.98	5.72	5.37	5.53	5.38	5.25	14.60	14.50	14.40	14.90	14.90	14.30	14.80	13.50
Cr	39.2	43.2	52.5	53.9	42.8	49.5	47.1	46.4	53.4	88.3	82.5	100.0	136.0	88.4	149.0	81.1
Co	7.90	8.82	8.84	9.65	9.17	9.50	9.04	8.84	25.70	26.10	24.90	26.60	28.50	24.60	29.40	24.10
Ni	17.5	18.2	20.6	19.2	22.3	22.8	21.9	20.1	32.7	33.3	31.4	47.3	77.7	34.5	107.0	31.1
Cu	43.3	145.0	50.3	53.6	49.3	31.9	19.5	39.3	53.2	48.4	23.2	32.0	86.2	26.8	65.5	49.5
Zn	21.3	23.1	20.3	24.2	26.9	23.6	22.5	23.7	78.2	78.1	88.5	84.3	81.7	79.3	82.1	77.7
Ga	16.6	17.7	21.0	18.4	17.6	18.2	18.2	17.0	18.3	19.2	20.2	20.2	18.0	19.2	18.3	18.7
Mo	1.080	0.597	1.170	1.020	0.614	0.562	0.372	1.310	1.170	1.630	1.720	1.430	1.430	1.170	1.120	1.390
Cd	0.029	0.022	0.058	0.033	0.036	0.029	0.018	0.016	0.082	0.084	0.132	0.079	0.088	0.103	0.099	0.081
In	0.010	0.014	0.014	0.010	0.013	0.007	0.009	0.014	0.047	0.043	0.052	0.049	0.048	0.045	0.046	0.050
Sb	0.342	0.369	0.019	0.464	0.443	0.367	0.366	0.390	0.491	0.472	0.460	0.392	0.272	0.376	0.434	0.404
Cs	5.26	6.08	5.10	6.07	5.97	6.63	5.17	5.52	3.30	2.60	4.27	5.65	3.81	3.04	2.62	4.29
W	0.742	0.862	0.856	0.872	0.942	0.811	0.735	1.380	0.893	0.991	1.290	0.970	0.984	0.988	0.957	1.080
Tl	0.612	0.560	0.570	0.677	0.704	0.591	0.597	0.665	0.432	0.387	0.473	0.396	0.384	0.441	0.461	0.420
Pb	15.6	16.6	17.8	18.7	17.5	16.6	15.8	17.1	18.0	16.1	20.7	20.0	16.5	18.9	16.4	18.9
Bi	0.199	0.676	1.320	1.130	0.386	0.256	0.102	0.168	0.120	0.111	0.155	0.137	0.304	0.123	0.149	0.152
∑REE	175	179	174	197	179	197	159	186	199	201	221	223	196	214	193	215
Eu/Eu^*	0.80	0.86	0.86	0.86	0.72	0.85	0.71	0.78	0.80	0.81	0.76	0.81	0.86	0.76	0.79	0.79
LREE	167	169	164	188	171	188	150	177	182	185	204	206	180	198	178	199
HREE	8.49	9.29	9.31	9.49	8.82	9.34	9.05	9.15	16.50	15.90	17.00	17.20	16.00	16.00	15.20	16.40
Ti/Yb	2 217	2 099	2 366	2 099	2 253	2 236	2 138	2 088	2 060	2 079	1 997	1 961	2 130	2 133	2 178	1 930
Nb/Ta	12.75	12.81	15.22	12.84	13.20	12.76	14.26	11.91	16.16	17.30	16.90	17.35	16.85	16.67	15.92	15.86
Rb/Sr	0.29	0.26	0.21	0.28	0.28	0.25	0.28	0.29	0.14	0.13	0.15	0.14	0.12	0.14	0.15	0.15
La/Yb	46.80	42.08	43.21	49.39	48.88	49.91	34.34	47.14	21.63	22.31	24.15	23.72	21.63	24.52	22.84	23.53
注：主量元素单位为%；微量元素和稀土元素单位为10^-6.

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表 4 哥日卓托似斑状花岗岩锆石Hf同位素分析结果

Table 4. LA-ICP-MS zircon U-Pb analyses of porphyritic granite

测点	t(Ma)	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	1σ	ε_Hf(0)	ε_Hf(t)	T_DM1(Hf)	T_DM2(Hf)	f_Lu/Hf
GR-N3-1	227	0.034 827	0.001 178 063	0.282 704 974	0.000 031	-2.37	2.42	778.60	993.17	-0.96
GR-N3-2	227	0.032 923	0.000 981 160	0.282 694 081	0.000 016	-2.76	2.06	789.90	1 012.98	-0.97
GR-N3-3	227	0.026 893	0.000 850 136	0.282 567 376	0.000 013	-7.24	-2.40	964.96	1 260.91	-0.97
GR-N3-4	227	0.035 453	0.001 018 262	0.282 690 055	0.000 014	-2.90	1.92	796.36	1 021.21	-0.97
GR-N3-5	227	0.030 399	0.000 967 203	0.282 698 832	0.000 019	-2.59	2.23	782.91	1 003.51	-0.97
GR-N3-6	227	0.025 684	0.000 736 291	0.282 687 886	0.000 016	-2.97	1.88	793.48	1 023.15	-0.98
GR-N3-7	227	0.029 830	0.000 876 503	0.282 650 459	0.000 015	-4.30	0.54	849.03	1 097.94	-0.97
GR-N3-8	227	0.037 108	0.001 091 671	0.282 631 013	0.000 017	-4.99	-0.18	881.36	1 137.94	-0.97
GR-N3-9	227	0.033 516	0.000 965 924	0.282 663 415	0.000 015	-3.84	0.98	832.80	1 073.20	-0.97
GR-N3-10	227	0.033 976	0.000 980 800	0.282 648 025	0.000 015	-4.38	0.43	854.81	1 103.58	-0.97
GR-N3-11	227	0.037 791	0.001 192 679	0.282 720 995	0.000 018	-1.80	2.98	756.17	961.74	-0.96
GR-N3-12	227	0.027 231	0.000 814 808	0.282 670 349	0.000 016	-3.59	1.25	819.74	1 058.31	-0.98
GR-N3-13	227	0.036 322	0.001 099 730	0.282 679 551	0.000 015	-3.27	1.53	812.94	1 042.56	-0.97

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