内蒙古北山造山带花岗岩地球化学、锆石U-Pb年龄和Hf同位素特征及地质意义

李敏; 任邦方; 滕学建; 张永; 段霄龙; 牛文超; 段连峰

doi:10.3799/dqkx.2017.598

内蒙古北山造山带花岗岩地球化学、锆石U-Pb年龄和Hf同位素特征及地质意义

doi: 10.3799/dqkx.2017.598

中国地质调查局天津地质调查中心, 天津 300170

基金项目:

中国地质调查局项目 12120114064601

中国地质调查局项目 121201006000172601

详细信息

作者简介:
李敏(1986-), 男, 工程师, 主要研究方向为岩石地球化学和构造地质学

中图分类号: P595
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- 被引次数: 0
出版历程
- 收稿日期: 2017-12-06
- 刊出日期: 2018-12-15

Geochemical Characteristics, Zircon U-Pb Age and Hf Isotope and Geological Significance of Granitoid in Beishan Orogenic Belt

Tianjin Center of Geological Survey, China Geological Survey, Tianjian 300170, China

摘要

摘要: 砾石滩地区位于内蒙古额济纳旗西部，晚古生代花岗岩出露广泛，是研究北山造山带晚古生代地质演化的关键地区.锆石LA-MC-ICP-MS U-Pb测年结果显示，该地区的花岗岩形成于晚石炭世，其中英云闪长岩年龄为310.8±1.4 Ma，花岗闪长岩年龄为310.3±1.4 Ma和306.0±1.2 Ma，二长花岗岩年龄为308.7±1.4 Ma.岩石学及化学成分显示其为准铝质-弱过铝质、中钾钙碱性系列岩石；稀土配分曲线呈现轻稀土元素相对富集的右倾分布特征，弱负铕异常（δEu为0.7~0.9）；岩石富集大离子亲石元素Rb、K等，具有负的Nb、Ta和Ti异常；英云闪长岩、花岗闪长岩具有不均一的ε_Hf（t）值（3.8~14.8）、（7.3~14.0），二阶段Hf同位素模式年龄t_DM^C分别为378~1 083 Ma、433~868 Ma.北山造山带北部晚石炭世英云闪长岩、花岗闪长岩、二长花岗岩的形成与壳幔混合有关，产生于大洋岩石圈俯冲过程中，形成于陆缘弧环境，该过程诱发了地幔对流，因而产生了幔源岩浆底侵，并将元古宙基底岩石熔融，壳幔混合之后形成晚石炭世大规模花岗岩类.
- 北山造山带 /
- 晚石炭世 /
- 构造环境 /
- 锆石LA-MC-ICP-MS U-Pb年龄 /
- 锆石Hf同位素 /
- 地球化学
Abstract: Lishitan area is located in west of Ejin County of Inner Mongolia, where Late Paleozoic granitoid is exposed in a wide range. And it's a key area to the geology evolution research of Beishan orogenic belt in Late Paleozoic. The zircon LA-MC-ICP-MS U-Pb dating results show that the granitoid in this area was formed in the Late Carboniferous, the tonalite was formed at 310.8±1.4 Ma, the granodiorite was formed at 310.3±1.4 Ma, 306.0±1.2 Ma respectively, and the monzonitic granite was formed at 308.7±1.4 Ma. The petrology and lithochemistry demonstrate that the tonalite, granodiorite and monzonitic granite belong to quasi-aluminous to weakly peraluminous rocks and middle-K calc-alcaline series. The tonalite, granodiorite and monzonitic granite are enriched in LREE and part of large iron lithophile elements, including Rb, K et al., relatively depleted in HREE, Nb, Ta and Ti with weakly negative europium anomaly (δEu is 0.7-0.9).The ε_Hf(t) values of tonalite and granodiorite are variable, ranging from 3.8 to 14.8 and 7.3 to 14.0 respectively. And the two stage Hf isotope model ages (t_DM^C) range from 378 to 1 083 Ma and from 433 to 868 Ma respectively. The formation of tonalite, granodiorite and monzonitic granite is related with crust-mantle mixing, which were formed in the active epicontinental arc environment in the process of the ocean lithosphere subduction in Northern Beishan orogenic belt in Late Carboniferous. Mantle convection was caused by the process, thus led to mantle-derived magma invasion, which melted the Proterozoic basement rocks, and massive granitoids formed after crust-mantle mixing in Late Carboniferous.
- Beishan orogenic belt /
- Late Carboniferous /
- tectonic setting /
- LA-MC-ICP-MS zircon U-Pb age /
- zircon Hf isotope /
- geochemistry

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图 1 额济纳旗砾石滩地区地质简图

1.下石炭统绿条山组；2.下石炭统白山组；3.流纹岩；4.晚石炭世英云闪长岩；5.晚石炭世花岗闪长岩；6.晚石炭世二长花岗岩；7.二叠纪花岗岩；8.第四系；9.地质界线；10.采样位置；11.缝合带；12.构造分区界线；13.国界；14.上白垩统赤金堡组

Fig. 1. Geological sketch map of Lishitan area in Ejina county

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图 2 镁铁质包体

Fig. 2. Mafic inclusions

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图 3 研究区花岗岩类野外与显微照片

a.英云闪长岩；b.英云闪长岩偏光显微照片；c.二长花岗岩侵入花岗闪长岩；d.花岗闪长岩偏光显微照片；e.二长花岗岩；f.二长花岗岩偏光显微照片

Fig. 3. Field photos and photomicrographs of granitoids in the study area

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图 4 砾石滩地区花岗岩类部分锆石阴极发光图像及年龄

黄圈为U-Pb测点，蓝圈为Hf同位素测点

Fig. 4. CL image and dating of zircons for granitoids in Lishitan area

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图 5 砾石滩地区花岗岩类LA-MC-ICP-MS锆石U-Pb年龄谐和图

Fig. 5. Zircon LA-MC-ICP-MS U-Pb concordia diagrams of granitoids in Lishitan area

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图 6 砾石滩地区花岗岩类K₂O-SiO₂图解(a)和A/CNK-A/NK图解(b)

b.据Peccerillo and Taylor(1976)

Fig. 6. Diagrams of K₂O versus SiO₂ (a) and A/CNK-A/NK (b) of granitoids in Lishitan area

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图 7 砾石滩地区花岗岩类稀土元素球粒陨石标准化配分模式图(a)和原始地幔标准化微量元素蛛网图(b)

球粒陨石标准化值、原始地幔标准化值据Sun and McDonough(1989)

Fig. 7. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element patterns (b) of granitoids in Lishitan area

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图 8 砾石滩地区花岗岩类构造判别图解

a.(Y+Nb)-Rb判别图, 据Pearce et al.(1984)；ORG.大洋脊花岗岩；WPG.板内花岗岩；VAG.火山弧花岗岩；syn-COLG.同碰撞花岗岩；b.R1-R2判别图, 据Batchelor and Bowden(1985), R1=4Si-11(Na+K)-2(Fe+Ti)，R2=6Ca+2Mg+Al

Fig. 8. Tectonic discrimination diagrams of granitoids in Lishitan area

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图 9 砾石滩地区英云闪长岩、花岗闪长岩的锆石Hf同位素时间演化图解

Fig. 9. Zircon Hf isotope time evolution diagram of the tonalite and granodiorite in Lishitan area

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表 1 砾石滩地区花岗岩LA-MC-ICP-MS U-Pb同位素分析结果

Table 1. Zircon LA-MC-ICP-MS U-Pb dating results of granitoids in Lishitan area

样品号	含量(10^-6)		同位素比值										表面年龄(Ma)
02TW1	Pb	U	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁸Pb/²³²Th	1σ	²³²Th/²³⁸U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ
1	4	76	0.049 6	0.000 6	0.357 3	0.024 9	0.052 2	0.003 7	0.012 8	0.000 3	0.396 0	0.000 9	312	4	310	22	296	161
2	4	77	0.049 3	0.000 7	0.362 5	0.045 7	0.053 3	0.006 8	0.012 2	0.000 5	0.531 5	0.001 1	310	4	314	40	343	287
3	5	98	0.048 8	0.000 6	0.353 1	0.015 9	0.052 5	0.002 4	0.013 0	0.000 3	0.386 1	0.000 5	307	4	307	14	307	103
4	4	86	0.049 7	0.000 5	0.359 4	0.020 1	0.052 4	0.002 9	0.014 1	0.000 3	0.378 8	0.000 6	313	3	312	17	303	126
5	6	117	0.049 8	0.000 5	0.360 3	0.016 2	0.052 5	0.002 3	0.013 3	0.000 2	0.400 5	0.000 3	313	3	312	14	308	101
6	5	108	0.049 5	0.000 5	0.356 3	0.015 6	0.052 2	0.002 3	0.013 8	0.000 2	0.360 8	0.000 6	312	3	309	14	293	99
7	6	114	0.049 6	0.000 5	0.359 8	0.019 9	0.052 6	0.002 9	0.012 3	0.000 2	0.435 7	0.001 3	312	3	312	17	311	125
8	6	127	0.049 3	0.000 5	0.362 1	0.014 9	0.053 3	0.002 1	0.012 4	0.000 2	0.396 4	0.000 8	310	3	314	13	341	90
9	4	77	0.049 4	0.000 6	0.362 8	0.028 7	0.053 3	0.004 3	0.010 7	0.000 4	0.369 4	0.000 6	311	4	314	25	343	181
10	6	127	0.049 5	0.000 5	0.362 2	0.013 8	0.053 1	0.002 0	0.013 8	0.000 2	0.445 4	0.001 5	311	3	314	12	331	86
11	4	92	0.048 0	0.000 6	0.348 3	0.023 3	0.052 6	0.003 5	0.015 3	0.000 4	0.341 2	0.001 3	303	4	303	20	310	154
12	6	121	0.049 2	0.000 5	0.361 3	0.018 0	0.053 3	0.002 6	0.014 7	0.000 4	0.354 3	0.000 9	309	3	313	16	341	109
13	4	82	0.049 2	0.000 6	0.364 1	0.025 0	0.053 7	0.003 9	0.014 1	0.000 3	0.455 5	0.000 7	309	4	315	22	358	163
14	6	115	0.049 6	0.000 6	0.364 3	0.021 9	0.053 3	0.003 4	0.014 3	0.000 2	0.636 3	0.004 2	312	4	315	19	341	145
15	4	84	0.049 9	0.000 6	0.360 3	0.021 6	0.052 3	0.003 2	0.013 9	0.000 3	0.395 1	0.000 6	314	4	312	19	300	139
16	6	117	0.049 4	0.000 5	0.362 5	0.017 8	0.053 2	0.002 7	0.014 6	0.000 2	0.446 1	0.000 9	311	3	314	15	336	114
17	5	101	0.049 8	0.000 5	0.361 4	0.022 9	0.052 6	0.003 3	0.015 7	0.000 3	0.514 7	0.003 0	314	3	313	20	311	144
18	4	71	0.049 0	0.000 6	0.360 2	0.041 3	0.053 3	0.006 4	0.015 5	0.000 7	0.385 8	0.000 8	309	4	312	36	340	270
19	4	73	0.049 2	0.000 6	0.357 8	0.026 6	0.052 7	0.004 5	0.014 9	0.000 4	0.482 5	0.001 2	310	4	311	23	318	194
20	5	97	0.049 4	0.000 5	0.360 5	0.024 3	0.053 0	0.003 6	0.007 3	0.000 4	0.461 0	0.000 4	311	3	313	21	327	153
21	6	115	0.049 6	0.000 5	0.361 0	0.015 4	0.052 8	0.002 3	0.014 3	0.000 2	0.510 3	0.000 4	312	3	313	13	321	100
22	7	132	0.049 6	0.000 6	0.362 7	0.013 3	0.053 0	0.001 9	0.015 3	0.000 2	0.593 8	0.003 2	312	4	314	12	328	83
23	7	132	0.049 6	0.000 6	0.360 2	0.013 2	0.052 7	0.001 9	0.014 6	0.000 2	0.489 7	0.001 9	312	4	312	11	315	81
24	20	372	0.049 6	0.000 6	0.362 1	0.007 0	0.053 0	0.000 9	0.015 3	0.000 1	0.577 6	0.004 0	312	4	314	6	328	39
25	9	167	0.048 9	0.000 5	0.358 0	0.012 7	0.053 1	0.001 9	0.014 8	0.000 2	0.504 6	0.002 2	308	3	311	11	334	79

样品号	含量(10^-6)		同位素比值										表面年龄(Ma)
06TW27	Pb	U	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁸Pb/²³²Th	1σ	²³²Th/²³⁸U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ
1	12	213	0.049 9	0.000 5	0.363 4	0.008 3	0.052 8	0.001 1	0.014 8	0.000 1	0.768 6	0.004 8	314	3	315	7	322	48
2	8	153	0.049 9	0.000 5	0.363 9	0.011 2	0.052 9	0.001 7	0.013 7	0.000 1	0.825 3	0.003 0	314	3	315	10	323	72
3	6	108	0.049 5	0.000 6	0.358 8	0.018 6	0.052 5	0.002 7	0.013 3	0.000 2	1.050 4	0.005 7	312	4	311	16	309	117
4	8	145	0.049 4	0.000 5	0.358 7	0.012 8	0.052 6	0.001 8	0.013 5	0.000 1	0.934 0	0.003 4	311	3	311	11	312	79
5	10	189	0.049 7	0.000 5	0.359 7	0.008 2	0.052 5	0.001 1	0.013 6	0.000 1	0.853 3	0.005 5	312	3	312	7	308	49
6	9	159	0.049 6	0.000 5	0.359 4	0.016 4	0.052 5	0.002 4	0.013 6	0.000 1	0.881 1	0.003 3	312	3	312	14	309	106
7	9	167	0.049 4	0.000 5	0.358 4	0.008 5	0.052 6	0.001 2	0.013 8	0.000 1	0.970 4	0.001 7	311	3	311	7	312	52
8	8	145	0.049 3	0.000 5	0.356 8	0.018 1	0.052 5	0.002 7	0.013 9	0.000 2	1.031 4	0.004 3	310	3	310	16	308	116
9	12	206	0.049 4	0.000 5	0.359 7	0.007 7	0.052 9	0.001 1	0.016 5	0.000 1	0.790 6	0.001 2	311	3	312	7	323	46
10	12	210	0.049 0	0.000 5	0.353 8	0.010 7	0.052 4	0.001 5	0.018 3	0.000 2	0.835 4	0.004 1	308	3	308	9	301	64
11	16	268	0.049 3	0.000 5	0.356 8	0.006 4	0.052 5	0.000 9	0.018 8	0.000 1	0.797 3	0.002 1	310	3	310	6	308	37
12	8	138	0.049 5	0.000 6	0.358 8	0.011 9	0.052 6	0.001 7	0.020 3	0.000 3	0.525 2	0.001 3	311	4	311	10	313	73
13	15	253	0.049 1	0.000 5	0.355 4	0.008 5	0.052 5	0.001 2	0.020 7	0.000 1	0.798 3	0.000 4	309	3	309	7	307	52
14	18	313	0.046 3	0.000 5	0.455 1	0.008 1	0.071 3	0.001 2	0.024 4	0.000 1	0.722 6	0.002 2	292	3	381	7	966	33
15	12	197	0.048 9	0.000 5	0.354 7	0.017 9	0.052 6	0.002 6	0.022 9	0.000 5	0.804 5	0.002 2	308	3	308	16	311	111
16	7	115	0.049 4	0.000 5	0.358 3	0.011 2	0.052 6	0.001 6	0.025 6	0.000 2	0.669 7	0.001 1	311	3	311	10	312	70
17	12	179	0.049 1	0.000 5	0.355 4	0.010 6	0.052 5	0.001 5	0.025 8	0.000 3	0.871 6	0.000 8	309	3	309	9	308	64
18	15	251	0.049 4	0.000 5	0.358 7	0.007 8	0.052 6	0.001 1	0.021 6	0.000 1	0.698 9	0.001 8	311	3	311	7	312	47
19	11	180	0.049 2	0.000 5	0.356 8	0.009 6	0.052 7	0.001 4	0.019 6	0.000 1	0.855 0	0.000 9	309	3	310	8	314	60
20	17	371	0.037 2	0.000 4	0.419 0	0.006 6	0.081 7	0.001 2	0.021 4	0.000 1	0.603 7	0.002 5	235	2	355	6	1239	29
21	9	166	0.049 4	0.000 6	0.360 3	0.013 2	0.052 9	0.001 9	0.019 5	0.000 3	0.716 3	0.008 5	311	4	312	11	326	82
22	12	206	0.048 8	0.000 5	0.352 4	0.006 9	0.052 3	0.001 0	0.017 2	0.000 1	0.842 3	0.001 9	307	3	307	6	299	42
23	8	154	0.039 2	0.000 5	0.629 0	0.016 6	0.116 3	0.002 8	0.023 2	0.000 2	0.714 0	0.001 3	248	3	495	13	1900	44
24	17	310	0.048 7	0.000 5	0.352 9	0.007 3	0.052 5	0.001 0	0.016 2	0.000 1	0.822 3	0.004 4	307	3	307	6	308	45

样品号	含量(10^-6)		同位素比值										表面年龄(Ma)
16TW10	Pb	U	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁸Pb/²³²Th	1σ	²³²Th/²³⁸U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ
1	10	196	0.048 6	0.000 5	0.353 7	0.007 2	0.052 8	0.001 0	0.015 8	0.000 1	0.596 1	0.002 9	306	3	308	6	320	44
2	13	237	0.048 3	0.000 5	0.349 0	0.007 7	0.052 4	0.001 1	0.015 9	0.000 1	0.674 0	0.002 6	304	3	304	7	304	49
3	10	203	0.048 6	0.000 5	0.353 6	0.008 9	0.052 7	0.001 3	0.015 3	0.000 1	0.526 5	0.000 9	306	3	307	8	317	55
4	12	230	0.048 2	0.000 5	0.350 9	0.006 7	0.052 8	0.001 0	0.015 3	0.000 0	0.714 9	0.000 7	304	3	305	6	319	41
5	12	213	0.048 5	0.000 5	0.353 3	0.007 3	0.052 8	0.001 0	0.015 6	0.000 1	0.753 1	0.001 5	305	3	307	6	322	45
6	10	198	0.048 5	0.000 5	0.351 5	0.007 1	0.052 6	0.001 0	0.015 7	0.000 1	0.637 1	0.000 7	305	3	306	6	310	44
7	16	312	0.048 6	0.000 5	0.351 0	0.005 8	0.052 3	0.000 8	0.016 0	0.000 1	0.476 4	0.001 8	306	3	306	5	301	34
8	9	182	0.048 6	0.000 5	0.352 0	0.008 8	0.052 5	0.001 2	0.015 8	0.000 1	0.532 5	0.001 9	306	3	306	8	309	54
9	12	234	0.048 4	0.000 5	0.351 8	0.006 3	0.052 7	0.000 9	0.015 9	0.000 1	0.648 6	0.002 7	305	3	306	6	316	39
10	9	181	0.048 6	0.000 5	0.350 9	0.008 5	0.052 4	0.001 2	0.016 0	0.000 1	0.473 2	0.002 9	306	3	305	7	303	53
11	4	80	0.048 7	0.000 5	0.354 0	0.015 0	0.052 7	0.002 2	0.016 3	0.000 2	0.479 7	0.001 4	307	3	308	13	316	96
12	8	156	0.048 7	0.000 5	0.353 3	0.009 9	0.052 7	0.001 4	0.016 0	0.000 1	0.557 7	0.002 7	306	3	307	9	315	62
13	16	311	0.048 9	0.000 5	0.354 4	0.006 1	0.052 6	0.000 9	0.015 4	0.000 1	0.558 3	0.002 6	308	3	308	5	311	37
14	10	192	0.048 8	0.000 5	0.353 5	0.007 9	0.052 5	0.001 1	0.015 0	0.000 1	0.486 3	0.001 0	307	3	307	7	307	49
15	9	186	0.048 7	0.000 5	0.351 2	0.008 6	0.052 3	0.001 2	0.014 5	0.000 1	0.512 7	0.002 2	306	3	306	7	300	52
16	9	186	0.048 7	0.000 5	0.354 0	0.007 5	0.052 7	0.001 1	0.013 2	0.000 1	0.439 7	0.002 2	307	3	308	6	316	46
17	13	257	0.048 5	0.000 5	0.352 1	0.006 1	0.052 6	0.000 8	0.013 1	0.000 1	0.507 7	0.002 8	306	3	306	5	312	36
18	15	295	0.048 8	0.000 5	0.353 8	0.005 7	0.052 6	0.000 8	0.013 4	0.000 1	0.479 5	0.002 1	307	3	308	5	310	34
19	13	252	0.048 2	0.000 5	0.353 4	0.006 0	0.053 2	0.000 9	0.012 3	0.000 0	0.521 5	0.001 4	304	3	307	5	336	36
20	14	272	0.049 1	0.000 5	0.356 0	0.005 8	0.052 6	0.000 8	0.012 9	0.000 0	0.544 8	0.001 4	309	3	309	5	311	34
21	15	272	0.048 8	0.000 5	0.352 6	0.007 4	0.052 4	0.001 0	0.013 1	0.000 0	0.866 5	0.001 1	307	3	307	6	303	45
22	22	396	0.048 6	0.000 5	0.352 4	0.005 1	0.052 6	0.000 7	0.012 5	0.000 0	0.920 0	0.002 1	306	3	307	4	313	30
23	12	234	0.048 8	0.000 5	0.354 5	0.006 2	0.052 7	0.000 8	0.013 2	0.000 0	0.625 2	0.000 5	307	3	308	5	316	36
24	13	242	0.048 6	0.000 5	0.352 6	0.005 9	0.052 6	0.000 8	0.013 5	0.000 0	0.745 9	0.002 1	306	3	307	5	311	36

样品号	含量(10^-6)		同位素比值										表面年龄(Ma)
14TW20	Pb	U	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁸Pb/²³²Th	1σ	²³²Th/²³⁸U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ
1	4	73	0.049 6	0.000 6	0.360 3	0.021 8	0.052 7	0.003 1	0.015 1	0.000 3	0.742 9	0.004 8	312	4	312	19	317	135
2	14	223	0.054 5	0.000 6	0.402 0	0.010 1	0.053 5	0.001 3	0.015 9	0.000 1	0.930 4	0.005 1	342	4	343	9	349	53
3	9	139	0.055 0	0.000 6	0.405 5	0.012 1	0.053 4	0.001 5	0.016 8	0.000 1	0.792 2	0.002 4	345	3	346	10	347	65
4	6	99	0.049 5	0.000 5	0.358 2	0.018 1	0.052 5	0.002 6	0.014 2	0.000 1	0.988 8	0.003 2	311	3	311	16	307	114
5	12	174	0.054 1	0.000 6	0.398 2	0.010 4	0.053 4	0.001 4	0.016 6	0.000 1	1.378 8	0.012 8	340	4	340	9	344	59
6	8	134	0.049 1	0.000 9	0.357 8	0.014 3	0.052 9	0.002 1	0.014 0	0.000 2	0.924 4	0.005 0	309	6	311	12	323	91
7	29	493	0.049 2	0.000 5	0.358 1	0.005 3	0.052 8	0.000 7	0.013 4	0.000 1	1.114 8	0.001 4	310	3	311	5	319	31
8	10	178	0.048 9	0.000 5	0.357 7	0.010 7	0.053 1	0.001 6	0.012 8	0.000 1	1.043 6	0.004 7	308	3	310	9	331	66
9	9	152	0.049 5	0.000 6	0.359 3	0.017 1	0.052 6	0.002 5	0.014 2	0.000 1	1.030 5	0.001 8	312	4	312	15	311	110
10	10	189	0.048 9	0.000 5	0.354 5	0.008 1	0.052 6	0.001 2	0.013 0	0.000 1	0.895 7	0.004 0	307	3	308	7	313	51
11	15	273	0.048 7	0.000 5	0.352 9	0.007 5	0.052 6	0.001 1	0.013 2	0.000 1	1.059 5	0.002 3	306	3	307	7	312	46
12	13	238	0.048 8	0.000 5	0.357 2	0.007 1	0.053 1	0.001 0	0.014 0	0.000 0	0.924 7	0.001 8	307	3	310	6	333	44
13	12	211	0.049 9	0.000 5	0.358 4	0.007 6	0.052 1	0.001 0	0.014 9	0.000 1	0.880 7	0.003 5	314	3	311	7	291	45
14	15	260	0.049 1	0.000 5	0.358 8	0.006 6	0.053 0	0.000 9	0.014 2	0.000 1	0.925 0	0.005 7	309	3	311	6	331	39
15	6	114	0.049 2	0.000 5	0.358 9	0.016 1	0.052 9	0.002 3	0.015 9	0.000 2	0.633 9	0.003 3	310	3	311	14	324	98
16	16	284	0.048 9	0.000 5	0.356 5	0.006 8	0.052 9	0.001 0	0.014 4	0.000 0	0.823 1	0.001 0	308	3	310	6	323	41
17	10	192	0.048 6	0.000 5	0.354 9	0.008 5	0.053 0	0.001 3	0.015 8	0.000 1	0.696 5	0.001 3	306	3	308	7	328	54
18	20	348	0.049 0	0.000 5	0.355 7	0.005 5	0.052 6	0.000 7	0.014 7	0.000 0	0.929 3	0.000 9	308	3	309	5	313	32
19	16	284	0.048 7	0.000 5	0.351 4	0.006 0	0.052 4	0.000 8	0.014 6	0.000 1	0.958 7	0.006 8	306	3	306	5	301	36
20	16	283	0.048 6	0.000 5	0.351 5	0.006 6	0.052 5	0.000 9	0.014 7	0.000 0	0.900 7	0.003 3	306	3	306	6	308	40
21	16	280	0.048 6	0.000 5	0.386 8	0.013 6	0.057 7	0.002 0	0.013 8	0.000 1	1.110 8	0.007 1	306	3	332	12	519	77
22	11	194	0.049 3	0.000 5	0.357 4	0.006 7	0.052 6	0.000 9	0.015 5	0.000 1	0.852 9	0.009 6	310	3	310	6	311	40
23	11	202	0.049 3	0.000 5	0.357 3	0.015 0	0.052 6	0.002 0	0.016 1	0.000 3	0.682 4	0.010 1	310	3	310	13	312	86
24	14	240	0.049 6	0.000 5	0.358 9	0.006 8	0.052 5	0.000 9	0.015 2	0.000 1	0.983 6	0.009 4	312	3	311	6	307	41
注：测试单位为天津地质矿产研究所实验室.

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表 2 砾石滩地区花岗岩类主量元素(%)、微量元素(10^-6)分析结果

Table 2. Major (%) and trace element (10^-6) compositions of granitoids in Lishitan area

样号	英云闪长岩			花岗闪长岩1		花岗闪长岩2					二长花岗岩
样号	02.1	02.2	02.3	06.1	06.2	16.1	16.2	16.3	16.4	16.5	TW.1	TW.2
SiO₂	65.97	65.08	65.40	68.57	67.37	64.04	63.04	61.04	60.14	60.21	73.06	69.83
Al₂O₃	16.56	17.20	16.56	15.11	15.04	15.39	15.57	16.09	16.33	16.23	13.92	14.27
Fe₂O₃	1.04	1.02	1.12	2.02	2.57	2.65	3.29	3.28	3.26	2.86	1.85	1.83
FeO	2.00	2.20	2.03	1.40	1.53	2.55	2.46	3.01	3.25	3.48	0.52	1.22
CaO	4.91	4.07	4.92	3.39	3.78	4.28	4.61	5.45	5.66	6.16	1.83	2.84
MgO	2.50	2.85	2.58	1.18	1.43	2.36	2.49	2.93	3.04	2.96	0.51	0.86
K₂O	1.27	1.40	1.10	3.35	3.14	2.91	2.50	2.50	2.15	2.58	3.57	2.73
Na₂O	4.28	4.62	4.18	3.43	3.39	3.03	3.12	3.07	3.05	3.08	3.51	3.63
TiO₂	0.36	0.38	0.40	0.48	0.56	0.56	0.61	0.62	0.70	0.56	0.27	0.41
P₂O₅	0.098	0.100	0.095	0.120	0.140	0.130	0.140	0.140	0.140	0.140	0.060	0.100
MnO	0.058	0.058	0.054	0.079	0.090	0.100	0.110	0.110	0.120	0.120	0.050	0.080
FeO_T	2.94	3.12	3.04	3.22	3.84	4.94	5.42	5.96	6.18	6.05	2.19	2.87
Fe₂O_3T	3.26	3.47	3.38	3.58	4.27	5.48	6.02	6.63	6.87	6.73	2.43	3.19
Mg^#	64.10	65.72	64.04	43.47	43.83	50.07	49.06	50.75	50.76	50.63	32.86	38.61
AR	1.70	1.79	1.65	2.16	2.06	1.87	1.77	1.70	1.62	1.68	2.63	2.18
A/CNK	0.95	1.04	0.97	0.98	0.95	0.97	0.96	0.91	0.93	0.85	1.07	1.01
SI	22.54	23.57	23.43	10.37	11.86	17.48	17.97	19.81	20.61	19.79	5.12	8.37
FL	53.06	59.66	51.76	66.67	63.34	58.12	54.94	50.54	47.88	47.88	79.46	69.13
MF	54.87	53.05	54.97	74.35	74.14	68.78	69.78	68.22	68.17	68.17	82.29	78.01
δ	1.34	1.64	1.24	1.80	1.75	1.68	1.58	1.72	1.58	1.86	1.67	1.51
K₂O+Na₂O	5.55	6.02	5.28	6.78	6.53	5.94	5.62	5.57	5.20	5.66	7.08	6.36
K₂O/Na₂O	0.30	0.30	0.26	0.98	0.93	0.96	0.80	0.81	0.70	0.84	1.02	0.75
灼失量	0.72	0.76	1.33	0.71	0.80	1.73	1.80	1.42	1.80	1.22	0.90	2.17
Cr	45.60	50.30	42.70	3.63	3.83	10.10	11.40	15.70	12.00	17.80	2.94	2.54
Ni	45.60	52.50	45.00	2.36	2.58	8.70	9.25	11.30	12.10	12.20	1.59	1.38
Co	11.00	12.40	10.90	5.95	7.09	13.00	14.40	17.40	18.60	17.40	1.87	3.71
Rb	50.00	57.50	43.40	105.00	95.80	78.80	66.10	79.60	62.20	80.70	145.00	92.00
Cs	3.36	3.37	2.66	4.61	4.18	4.02	2.93	4.39	4.15	5.83	1.83	1.74
Sr	296	356	315	215	219	256	276	287	278	357	149	230
Ba	114	127	118	582	519	384	322	328	298	415	589	525
V	52.70	55.10	53.40	62.50	74.90	110.00	123.00	140.00	158.00	144.00	19.30	35.60
Sc	10.20	9.53	9.14	8.54	8.98	15.50	15.40	18.10	18.10	21.20	6.99	7.41
Nb	3.26	2.83	3.21	7.50	8.27	6.62	7.03	5.88	7.33	5.80	7.80	6.83
Ta	0.26	0.26	0.28	0.63	0.68	0.58	0.59	0.65	0.81	0.52	0.77	0.57
Zr	113.0	104.0	109.0	198.0	215.0	132.0	121.0	65.2	99.2	140.0	104.0	154.0
Hf	2.78	2.90	2.98	5.83	6.15	4.31	3.97	2.77	4.00	5.13	3.58	4.59
Ga	15.00	14.70	14.50	16.00	16.20	16.00	16.70	17.10	17.80	17.00	13.20	14.40
U	0.46	0.51	0.47	2.18	2.30	1.63	1.87	2.14	3.23	1.87	1.17	1.78
Th	3.88	3.61	4.23	13.00	11.80	11.50	10.70	12.60	14.30	9.53	11.50	7.49
La	9.75	9.29	8.90	23.40	26.10	21.20	18.90	20.70	16.10	17.80	20.70	19.00
Ce	17.10	17.30	15.40	47.70	51.70	42.30	39.20	41.60	37.90	41.20	37.50	36.30
Pr	2.46	2.42	2.31	5.98	6.37	5.15	4.76	5.32	5.30	5.72	4.22	4.26
Nd	9.73	9.67	8.84	22.60	24.20	19.30	18.30	21.20	21.60	23.40	14.70	15.80
Sm	2.25	2.30	1.90	4.42	4.77	3.66	3.67	4.53	4.74	4.98	2.57	2.97
Eu	0.58	0.59	0.55	1.06	1.08	0.86	0.85	1.08	1.10	1.19	0.58	0.77
Gd	2.30	2.25	2.02	4.01	4.44	3.29	3.30	4.35	4.31	4.69	2.29	2.67
Tb	0.36	0.36	0.31	0.63	0.70	0.52	0.51	0.68	0.72	0.76	0.35	0.44
Dy	1.97	2.08	1.78	3.85	4.24	3.14	3.15	4.06	4.41	4.66	2.01	2.61
Ho	0.38	0.40	0.34	0.82	0.92	0.65	0.65	0.83	0.94	0.98	0.42	0.52
Er	1.08	1.11	0.95	2.36	2.62	1.84	1.86	2.43	2.65	2.81	1.34	1.67
Tm	0.16	0.17	0.15	0.36	0.41	0.28	0.29	0.37	0.41	0.44	0.22	0.27
Yb	1.07	1.11	0.97	2.47	2.76	1.89	1.92	2.47	2.82	2.94	1.70	2.03
Lu	0.16	0.18	0.15	0.40	0.44	0.30	0.30	0.38	0.44	0.46	0.29	0.34
Y	12.20	12.10	10.30	21.80	24.30	16.40	16.50	18.60	21.00	22.60	11.70	15.50
δEu	0.77	0.78	0.85	0.76	0.71	0.74	0.73	0.73	0.73	0.74	0.72	0.82
ΣREE	61.55	61.33	54.87	141.86	155.05	120.78	114.16	128.60	124.44	134.63	100.59	105.15
LREE/HREE	5.60	5.43	5.68	7.06	6.91	7.76	7.15	6.06	5.19	5.32	9.31	7.50
(La/Lu)_N	6.53	5.53	6.36	6.27	6.36	7.57	6.75	5.84	3.92	4.15	7.65	5.99
(La/Sm)_N	2.80	2.61	3.02	3.42	3.53	3.74	3.32	2.95	2.19	2.31	5.20	4.13
(Gd/Lu)_N	1.78	1.55	1.66	1.24	1.25	1.36	1.36	1.41	1.21	1.26	0.98	0.97
注：测试工作由天津地质矿产研究所完成，常量元素采用XRF测试，其中FeO采用氢氟酸、硫酸溶样、重铬酸钾滴定容量法，微量元素采用ICP-MS测试.

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表 3 英云闪长岩(02TW1)、花岗闪长岩(7218)锆石Hf同位素数据

Table 3. Zircon Hf isotopic data of the tonalite (02TW1) and granodiorite (7218)

点号	t(Ma)	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	2σ	¹⁷⁶Hf/¹⁷⁷Hf_i	ε_Hf(0)	ε_Hf(t)	t_DM(Ma)	t_DM^C(Ma)
02TW1.1	312	0.032 3	0.000 7	0.282 866	0.000 028	0.282 862	3.3	10.0	542	685
02TW1.2	307	0.036 8	0.000 8	0.282 964	0.000 033	0.282 960	6.8	13.4	406	466
02TW1.3	313	0.047 8	0.001 0	0.282 804	0.000 034	0.282 798	1.1	7.8	636	831
02TW1.4	313	0.034 2	0.000 8	0.282 893	0.000 028	0.282 888	4.3	11.0	506	624
02TW1.5	310	0.039 0	0.000 9	0.282 803	0.000 031	0.282 797	1.1	7.7	635	833
02TW1.6	311	0.032 6	0.000 8	0.282 691	0.000 030	0.282 687	-2.9	3.8	790	1 083
02TW1.7	311	0.041 0	0.000 9	0.282 732	0.000 035	0.282 726	-1.4	5.2	736	993
02TW1.8	303	0.033 6	0.000 8	0.282 727	0.000 031	0.282 723	-1.6	4.9	740	1007
02TW1.9	309	0.054 9	0.001 4	0.282 950	0.000 034	0.282 942	6.3	12.8	433	506
02TW1.10	314	0.025 4	0.000 7	0.282 776	0.000 032	0.282 772	0.1	6.9	669	888
02TW1.11	312	0.055 3	0.001 7	0.283 100	0.000 028	0.283 091	11.6	18.1	218	163
02TW1.12	309	0.020 1	0.000 5	0.283 121	0.000 033	0.283 119	12.4	19.1	181	101
02TW1.13	311	0.027 4	0.000 9	0.283 211	0.000 036	0.283 206	15.5	22.2	56	-101
02TW1.14	310	0.035 3	0.000 9	0.282 956	0.000 027	0.282 950	6.5	13.1	419	485
02TW1.15	311	0.020 1	0.000 6	0.282 972	0.000 023	0.282 968	7.1	13.8	393	444
02TW1.16	312	0.029 1	0.000 8	0.283 002	0.000 025	0.282 997	8.1	14.8	353	378
7218.1	318	0.035 4	0.001 0	0.282 837	0.000 020	0.282 831	2.3	9.1	589	753
7218.2	316	0.097 8	0.002 4	0.282 986	0.000 032	0.282 972	7.6	14.0	392	433
7218.3	317	0.086 9	0.002 3	0.282 879	0.000 026	0.282 865	3.8	10.3	548	675
7218.4	318	0.051 5	0.001 6	0.282 918	0.000 027	0.282 909	5.2	11.8	481	575
7218.5	318	0.084 9	0.002 6	0.282 824	0.000 025	0.282 808	1.8	8.3	634	803
7218.6	319	0.048 4	0.001 9	0.282 848	0.000 026	0.282 837	2.7	9.3	586	737
7218.7	318	0.064 7	0.002 0	0.282 824	0.000 023	0.282 812	1.8	8.4	623	794
7218.8	319	0.039 4	0.001 2	0.282 841	0.000 022	0.282 834	2.4	9.2	586	745
7218.9	319	0.055 4	0.001 8	0.282 890	0.000 023	0.282 880	4.2	10.8	523	640
7218.10	317	0.055 4	0.001 9	0.282 791	0.000 024	0.282 780	0.7	7.3	669	868
7218.11	318	0.073 6	0.002 1	0.282 830	0.000 025	0.282 818	2.1	8.6	616	782
7218.12	321	0.040 1	0.001 3	0.282 856	0.000 020	0.282 848	3.0	9.8	566	711
7218.13	320	0.045 7	0.001 2	0.282 865	0.000 022	0.282 858	3.3	10.1	552	689
7218.14	318	0.052 5	0.001 6	0.282 840	0.000 020	0.282 831	2.4	9.1	593	753
7218.15	317	0.049 3	0.001 4	0.282 933	0.000 025	0.282 924	5.7	12.4	458	541
7218.16	319	0.062 8	0.001 8	0.282 858	0.000 028	0.282 848	3.1	9.7	569	713
注：测试单位为天津地质矿产研究所实验室

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参考文献(104)

Amelin, Y., Lee, D.C., Halliday, A.N., et al., 1999.Nature of the Earth's Earliest Crust from Hafnium Isotopes in Single Detrital Zircons. Nature, 399(6733):252-255. https://doi.org/10.1038/20426
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