东秦岭金堆城花岗斑岩体的锆石U-Pb年龄、物质来源及成矿机制

焦建刚; 汤中立; 钱壮志; 袁海潮; 闫海卿; 孙涛; 徐刚; 李小东

doi:10.3799/dqkx.2010.114

东秦岭金堆城花岗斑岩体的锆石U-Pb年龄、物质来源及成矿机制

doi: 10.3799/dqkx.2010.114

1.
长安大学地球科学与资源学院，陕西西安 710054
2.
矿产资源与地质工程教育部重点实验室，陕西西安 710054
3.
西北有色地质勘查局712总队，陕西咸阳 712000

基金项目:

长安大学科技创新基础研究项目 CHD2009JC044

长安大学科技创新基础研究项目 CHD2010ZD005

公益性行业科研专项 200911007-5

公益性行业科研专项 201011058

深部探测技术与试验研究专项 SinoProbe-05-01

详细信息

作者简介:
焦建刚(1976-)，男，副教授，从事矿床学及矿产勘查研究.E-mail: jiangang@chd.edu.cn

中图分类号: P597
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出版历程
- 收稿日期: 2009-11-15
- 刊出日期: 2010-11-01

Metallogenic Mechanism, Magma Source and Zircon U-Pb Age of Jinduicheng Granitic Porphyry, East Qinling

1.
School of Earth Science and Resources, Chang'an University, Xi'an 710054, China
2.
Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Xi'an 710054, China
3.
712 Team of Northwestern Geology Exploration Bureau for Nonferrous Metal Resources, Xianyang 712000, China

摘要

摘要: 通过LA-ICP-MS方法测得金堆城和老牛山花岗岩体中锆石U-Pb年龄分别为143.7±3 Ma和144.5±4.4 Ma，与金堆城钼矿床中辉钼矿的Re-Os年龄139±3.0 Ma在误差范围内一致，界定了金堆城成岩成矿时代为侏罗纪末-白垩纪初，2个岩体为同期岩浆事件的产物，与燕山运动有关.金堆城岩体较老牛山岩体富SiO₂、K₂O，岩石地球化学数据显示2个岩体都具有一致的高硅、富碱、过铝质系列和钙碱性岩石系列特征；高的ε_Sr(t)、低的ε_Nd(t)及Pb同位素图解证明2个岩体主要来自下地壳物质部分熔融，可能有少量地幔物质加入.年代学与岩石地球化学数据证实老牛山岩体和金堆城岩体的岩浆源区与岩石成因相同，推测老牛山岩体在深部发生分异演化，为金堆城小岩体提供了大量的热液和矿物质，从而出现了金堆城小岩体成大矿现象.
- 锆石U-Pb年龄 /
- 成矿机制 /
- 花岗岩 /
- 地球化学
Abstract: Zircon U-Pb isotopic ages of Jinduicheng and Laoniushan granite are measured by LA-ICP-MS techniques, and we find that the mean ages are 143.7±3 Ma and 144.5±4.4 Ma respectively, which correspond to the molybdenite Re-Os age 139±3.0 Ma of Jinduicheng molybdenite polymetallic deposit. It indicates that the diagenetic and metallogenic ages of Jinduicheng deposit are between Jurassic and Cretaceous, related with Yanshan movement. Granites in Jinduicheng are richer in SiO₂, K₂O than those in Laoniushan. The geochemical data demonstrate that Jinduicheng and Laoniushan granites are both characterized with high Si, rich alkali, peraluminous rock series and the calcium alkaline rock series, which indicate that the rock-bodies belong to the continental crust granite; the high ε_Sr (t), low ε_Nd(t), and the Pb isotope values prove the main source of the rock-bodies is partial melting of lower continental-crust materials. The chronology and the litho-geochemical data confirm that Laoniushan and Jinduicheng granite are the same magma source area, and it is concluded that Laoniushan rock body has provided mass hydrothermal and mineral substance in depth for the small Jinduicheng rock body, which in turn led to the phenomenon of the Jinduicheng small rock body containing large ore deposit.
- zircon U-Pb isotopic age /
- metallogenic mechanism /
- granite /
- geochemistry

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图 1 金堆城钼矿床地质(黄典豪等，1987)

1.中元古界熊耳群火山岩；2.中元古界熊耳群板岩；3.中元古界高山河组石英砂岩；4.燕山期二长花岗岩；5.花岗斑岩；6.辉绿玢岩；7.角岩化；8.黑云母化；9.不整合接触界线；10.断层；11.背斜轴；12.向斜轴；13.采样位置

Fig. 1. Geological map of Jinduicheng porphyry molybdenum deposit

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图 2 金堆城斑岩体样品阴极发光照片及分析点位置

Fig. 2. Cathode-luminescence photos of zircons from sample of Jinduicheng granitic porphyry

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图 3 老牛山花岗岩体样品阴极发光照片及分析点位置

Fig. 3. Cathode-luminescence photos of zircons from sample of Laoniushan granite

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图 4 金堆城斑岩体(a)与老牛山花岗岩体(b)样品锆石U-Pb年龄谐和图

Fig. 4. Concordia diagram of zircon U-Pb dating result from Jinduicheng granitic porphyrry (a) and Laoniushan granite (b)

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图 5 金堆城与老牛山岩体SiO₂-K₂O图解(a)与A/MF-C/MF图解(b) (肖庆辉等，2002)

Fig. 5. SiO₂-K₂O and A/MF-C/MF diagrams of Jinduicheng and Laoniushan granite

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图 6 ²⁰⁶Pb/²⁰⁴Pb-²⁰⁸Pb/²⁰⁴Pb图(Zartman and Haines, 1988)

Fig. 6. ²⁰⁶Pb/²⁰⁴Pb-²⁰⁸Pb/²⁰⁴Pb diagram of the granite

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图 7 金堆城与老牛山岩体铅同位素及来源关系(底图据周作侠等，1993)

A.地幔；B.造山带；C.上地壳；D.下地壳；E.下岩石圈；1.全岩；2.钾长石；3.方铅矿(实线圈出了各区80%的投点，虚线圈出了可能的平均值)

Fig. 7. Diagram showing Pb isotopic compositions and sources of the Granite in Jinduicheng and Laoniushan

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图 8 金堆城钼矿床成矿模式示意图

1.下地壳物质；2.花岗岩；3.成矿元素(硫化物)；4.矿体；5.气液物质运移方向；6.大气水运移方向

Fig. 8. Model sketch map of Jinduicheng Mo deposit

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表 1 金堆城斑岩体中锆石U-Pb年龄测试结果

Table 1. U-Pb isotopic analysesfor zircons from Jinduicheng granitic porphyry

样品分析号	含量(μg/g)			Th/U	同位素比值			年龄(Ma)
样品分析号	²⁰⁶Pb_c	²³²Th	²³⁸U	Th/U	²⁰⁷Pb^/²⁰⁶Pb^ (±1σ)	²⁰⁷Pb^*/²⁰⁵U (±1σ)	²⁰⁶Pb^*/²³⁸U (±1σ)	²⁰⁷Pb^*/²⁰⁶Pb	²⁰⁷Pb^*/²³⁵U	²⁰⁶Pb^*/²³⁸U
JDC01	25.28	112.44	255.62	0.44	0.075 71±0.002 03	0.257 78±0.005 10	0.024 66±0.000 28	1 087±22	223±4	157±2
JDC02	65.04	217.27	510.79	0.43	0.055 89±0.002 26	0.176 21±0.006 84	0.022 87±0.000 27	448±92	165±6	146±2
JDC03	223.4	820.44	2 612.33	0.32	0.057 97±0.001 40	0.169 62±0.002 77	0.021 19±0.000 23	529±18	159±2	135±1
JDC04	233.04	803.61	2 942.89	0.27	0.050 62±0.001 72	0.143 94±0.004 62	0.020 62±0.000 23	224±81	137±4	132±1
JDC05	397.68	669.19	3 458.76	0.19	0.050 63±0.002 08	0.163 58±0.006 44	0.023 47±0.000 28	224±97	154±6	150±2
JDC06	389.15	2 567.6	4 167.88	0.62	0.073 96±0.003 08	0.230 19±0.009 16	0.022 57±0.000 27	1 040±86	210±8	144±2
JDC07	240.69	844.55	2 254.03	0.37	0.062 14±0.001 83	0.197 76±0.005 35	0.023 08±0.000 26	679±64	183±5	147±2
JDC08	340	1 173.59	3 877.4	0.30	0.050 32±0.001 13	0.153 02±0.003 0	0.022 05±0.000 24	210±53	145±3	141±2
JDC09	218.87	1 142.33	2 352.98	0.49	0.068 44±0.002 75	0.202 88±0.007 77	0.021 50±0.000 26	882±85	188±7	137±2
JDC10	323.87	880	3 538.32	0.25	0.048 06±0.001 01	0.150 64±0.001 83	0.022 72±0.000 24	102±13	142±2	145±2
JDC11	241.83	964.52	2 607.63	0.37	0.050 44±0.001 08	0.159 16±0.002 02	0.022 88±0.000 25	215±13	150±2	146±2
JDC12	297.08	1 048.08	3 294.53	0.32	0.047 69±0.001 01	0.149 36±0.001 85	0.022 72±0.000 24	84±13	141±2	145±2
JDC13	523.46	927.83	5 145.28	0.18	0.049 82±0.001 04	0.170 51±0.002 07	0.024 83±0.000 27	187±13	160±2	158±2
JDC14	68.79	311.05	632.44	0.49	0.052 13±0.001 47	0.176 60±0.003 91	0.024 57±0.000 28	291±30	165±3	156±2
JDC15	266.66	708.63	2 180.1	0.32	0.046 05±0.003 01	0.134 59±0.008 66	0.021 20±0.000 24		128±8	135±2
JDC16	304.93	1 258.72	3 491.47	0.36	0.051 75±0.001 31	0.159 01±0.003 62	0.022 29±0.000 24	274±59	150±3	142±2
JDC17	96.5	398.1	869.25	0.46	0.049 94±0.002 55	0.159 03±0.007 89	0.023 09±0.000 28	192±118	150±7	147±2
JDC18	115.89	418.04	1 364.89	0.31	0.054 07±0.001 92	0.156 59±0.005 27	0.021 00±0.000 24	374±82	148±5	134±2
JDC19	279.15	1 644.11	3 008.51	0.55	0.048 35±0.001 03	0.154 63±0.002 03	0.023 22±0.000 25	116±14	146±2	148±2
JDC20	563.71	1 032.02	715	1.44	0.103 91±0.002 21	3.066 03±0.034 99	0.214 22±0.002 32	1 695±9	1 424±9	1 251±12
JDC21	118.2	298.18	1 264.17	0.24	0.061 16±0.001 80	0.194 13±0.005 24	0.023 02±0.000 27	645±65	180±4	147±2
JDC22	292.32	788.22	3 088.46	0.26	0.049 21±0.001 03	0.161 63±0.002 03	0.023 86±0.000 26	158±13	152±2	152±2
JDC23	200.65	733.94	2 202.5	0.33	0.056 28±0.002 29	0.165 93±0.006 45	0.021 38±0.000 25	464±92	156±6	136±2
JDC24	215.69	748.08	2 280.59	0.33	0.050 39±0.001 25	0.165 77±0.003 01	0.023 91±0.000 27	213±22	156±3	152±2
JDC25	236.81	658.58	2 493.39	0.26	0.059 84±0.002 19	0.182 75±0.006 34	0.022 15±0.000 26	598±81	170±5	141±2
JDC26	380.41	1 433.09	4 589.65	0.31	0.050 32±0.001 16	0.142 09±0.002 26	0.020 53±0.000 23	210±18	135±2	131±1
JDC27	829.18	1 389.39	4 403.29	0.32	0.104 04±0.036 15	0.255 15±0.088 08	0.017 79±0.000 71	1 697±774	231±71	114±4
JDC28	169.58	799.65	1 885.82	0.42	0.058 33±0.001 88	0.174 61±0.005 23	0.021 71±0.000 26	542±72	163±5	138±2
注：测试在西北大学大陆动力学国家重点实验室完成，2007.

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表 2 老牛山花岗岩体中锆石U-Pb年龄测试结果

Table 2. U-Pb isotopic analyses for zircons from Laoniushan granite

样品分析号	含量(μg/g)			Th/U	同位素比值			年龄(Ma)
样品分析号	²⁰⁶Pb_c	²³²Th	²³⁸U	Th/U	²⁰⁷Pb^/²⁰⁶Pb^ (±1σ)	²⁰⁷Pb^*/²⁰⁵U (±1σ)	²⁰⁶Pb^*/²³⁸U (±1σ)	²⁰⁷Pb^*/ ²⁰⁶Pb	²⁰⁷Pb^*/ ²³⁵U	²⁰⁶Pb^*/ ²³⁸U
LN01	259.53	746.44	2 563.46	0.29	0.048 95±0.002 58	0.159 1±0.007 81	0.023 62±0.000 37	145±84	150±7	150±2
LN02	205.41	747.16	2 241.70	0.33	0.048 27±0.001 01	0.154 12±0.002 10	0.023 21±0.000 25	113±15	146±2	148±2
LN03	64.04	439.58	405.64	1.08	0.057 13±0.004 46	0.168 67±0.012 94	0.021 41±0.000 31	497±178	158±11	137±2
LN04	35.45	313.19	380.77	0.82	0.058 11±0.004 14	0.174 64±0.012 18	0.021 80±0.000 32	534±161	163±11	139±2
LN05	141.34	456.75	1 348.93	0.34	0.051 12±0.001 33	0.172 86±0.004 06	0.024 53±0.000 27	246±61	162±4	156±2
LN06	152.78	507.90	1 673.79	0.30	0.049 33±0.001 28	0.152 56±0.003 05	0.022 47±0.000 26	164±26	144±3	143±2
LN07	166.85	620.53	1 852.08	0.34	0.048 98±0.001 04	0.151 8±0.002 09	0.022 52±0.000 25	147±15	143±2	144±2
LN08	84.00	133.04	697.70	0.19	0.053 61±0.001 46	0.223 36±0.004 81	0.030 27±0.000 35	355±28	205±4	192±2
LN09	267.98	648.24	3 127.11	0.21	0.046 55±0.000 95	0.140 17±0.001 75	0.021 87±0.000 24	26±13	133±2	139±2
LN10	249.81	967.06	2 923.51	0.33	0.050 35±0.001 11	0.148 53±0.002 20	0.021 43±0.000 24	211±16	141±2	137±2
LN11	8.41	68.55	97.94	0.70	0.050 13±0.005 83	0.152 48±0.017 19	0.022 09±0.000 60	201±203	144±15	141±4
LN12	12.69	149.67	149.13	1.00	0.048 92±0.002 87	0.151 78±0.008 41	0.022 53±0.000 36	144±96	143±7	144±2
LN13	148.73	523.73	1 702.41	0.31	0.048 80±0.001 07	0.150 18±0.002 20	0.022 35±0.000 25	138±16	142±2	142±2
LN14	544.07	2 202.24	5 784.73	0.38	0.098 88±0.002 26	0.329 26±0.005 14	0.024 18±0.000 28	1 603±14	289±4	154±2
LN15	196.94	615.07	2 299.19	0.27	0.053 43±0.001 43	0.161 1±0.003 90	0.021 87±0.000 25	347±62	152±3	139±2
LN16	14.90	142.51	158.35	0.90	0.053 89±0.002 82	0.165 51±0.008 03	0.022 90±0.000 34	366±82	156±7	142±2
LN17	81.52	296.65	918.76	0.32	0.047 68±0.001 43	0.156 47±0.003 85	0.023 82±0.000 28	83±36	148±3	152±2
LN18	124.35	489.49	1 377.23	0.36	0.050 89±0.001 31	0.160 95±0.003 12	0.022 95±0.000 26	236±25	152±3	146±2
LN19	99.84	601.04	1 007.59	0.60	0.050 28±0.001 51	0.189 18±0.004 67	0.027 31±0.000 33	208±35	176±4	174±2
LN20	272.25	655.49	2 858.58	0.23	0.049 30±0.001 07	0.164 92±0.002 31	0.024 27±0.000 27	162±15	155±2	155±2
LN21	129.81	482.55	1 669.15	0.29	0.052 0±0.001 480	0.139 2±0.003 62	0.019 42±0.000 22	285±67	132±3	124±1
LN22	203.69	543.09	2 251.25	0.24	0.048 64±0.001 39	0.137 84±0.003 61	0.020 55±0.000 24	131±69	131±3	131±2
LN23	421.54	1 520.47	4 890.90	0.31	0.049 46±0.001 40	0.124 82±0.003 21	0.018 30±0.000 21	170±67	119±3	117±1
LN24	350.83	1 483.70	4 226.40	0.35	0.056 75±0.001 86	0.158 05±0.004 86	0.020 20±0.000 23	482±74	149±4	129±1
LN25	178.58	499.02	1 921.21	0.26	0.051 08±0.001 15	0.168 93±0.002 51	0.023 98±0.000 27	244±16	158±2	153±2
LN26	19.98	252.99	241.60	1.03	0.053 33±0.002 17	0.167 04±0.006 06	0.022 71±0.000 30	343±58	157±5	145±2
LN27	151.44	595.82	1 821.32	0.33	0.106 78±0.002 57	0.333 68±0.005 57	0.022 65±0.000 26	1745±15	292±4	144±2
LN28	224.36	765.31	2 567.54	0.30	0.073 19±0.003 70	0.221 83±0.010 81	0.021 98±0.000 29	1 019±105	203±9	140±2
LN29	178.80	529.43	2 066.07	0.26	0.050 60±0.001 43	0.154 38±0.003 98	0.022 13±0.000 26	223±67	146±3	141±2
LN30	228.01	629.00	2 668.90	0.24	0.050 25±0.001 18	0.152 29±0.003 13	0.021 98±0.000 25	206±56	144±3	140±2
LN31	172.70	790.02	1 758.06	0.45	0.059 61±0.001 63	0.202 58±0.004 99	0.024 65±0.000 29	589±61	187±4	157±2
LN32	174.74	695.94	2 082.87	0.34	0.049 58±0.001 57	0.152 61±0.004 49	0.022 32±0.000 26	175±76	144±4	142±2
LN33	201.07	560.36	2 449.34	0.23	0.048 32±0.001 56	0.142 8±0.004 30	0.021 44±0.000 25	115±75	136±4	137±2
LN34	389.79	1 604.77	4 408.44	0.36	0.049 03±0.001 07	0.155 33±0.002 09	0.022 93±0.000 25	149±14	147±2	146±2
注：测试在西北大学大陆动力学国家重点实验室完成，2007.

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表 3 金堆城花岗斑岩和老牛山花岗岩主量元素分析结果(%)

Table 3. Major element analysis result of Jinduicheng granitic porphyry and Laoniushan granite

岩体	样品号	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MnO	MgO	CaO	Na₂O	K₂O
金堆城花岗斑岩	JD-1	74.00	0.20	13.00	1.89	0.10	0.3	1.00	2.20	6.00
金堆城花岗斑岩	JD-10	73.20	0.15	12.60	2.09	0.09	0.37	1.08	1.63	6.61
金堆城花岗斑岩	L303^①	78.14	0.04	11.18	0.53	0.02	0.10	0.52	1.19	7.70
金堆城花岗斑岩	L401^①	74.22	0.11	12.71	1.34	0.04	0.21	0.98	1.23	7.58
金堆城花岗斑岩	L403^①	72.87	0.13	14.01	1.65	0.06	0.24	1.21	3.75	5.09
老牛山花岗岩	LN1	72.08	0.14	14.75	2.01	0.09	0.31	1.59	3.99	4.39
老牛山花岗岩	LN2	73.61	0.13	14.4	1.82	0.09	0.26	0.76	3.76	4.67
老牛山花岗岩	M601^②	75.46	0.06	13.91	0.50	0.01	0.07	0.48	3.55	5.77
老牛山花岗岩	M602^②	71.49	0.13	15.80	1.56	0.07	0.26	1.51	4.13	5.01
老牛山花岗岩	M615^②	76.39	0.06	13.74	0.46	0.03	0.08	0.59	3.90	4.59
老牛山花岗岩	M616^②	70.31	0.16	16.25	1.83	0.08	0.30	1.62	4.17	4.44

岩体	样品号	P₂O₅	LOI	Total	δ	Na₂O+K₂O	K₂O/Na₂O	ACNK	ANK	Mg^#
金堆城花岗斑岩	JD-1	0.00	1.50	100.00	2.17	8.20	1.80	1.08	1.28	0.24
金堆城花岗斑岩	JD-10	0.04	2.08	99.90	2.25	8.24	2.67	1.07	1.28	0.26
金堆城花岗斑岩	L303^①	0.01	0.68	99.99	2.25	8.89	6.47	0.99	1.08	0.27
金堆城花岗斑岩	L401^①	0.04	1.43	99.90	2.49	8.81	6.16	1.06	1.24	0.24
金堆城花岗斑岩	L403^①	0.05	1.10	100.00	2.62	8.84	1.36	1.01	1.20	0.22
老牛山花岗岩	LN1	0.06	0.75	100.16	2.42	8.38	0.73	1.04	1.30	0.24
老牛山花岗岩	LN2	0.05	0.63	100.18	2.32	8.43	0.82	1.14	1.28	0.22
老牛山花岗岩	M601^②	0.02	0.52	100.35	2.68	9.32	1.63	1.07	1.15	0.22
老牛山花岗岩	M602^②	0.05	0.32	100.33	2.93	9.14	1.21	1.06	1.29	0.25
老牛山花岗岩	M615^②	0.02	0.45	100.31	2.16	8.49	1.18	1.10	1.21	0.26
老牛山花岗岩	M616^②	0.06	0.60	99.82	2.71	8.61	1.06	1.11	1.39	0.25
注：西北大学大陆动力学国家重点实验室XRF法测定，^①据王新(2001)；^②据朱赖民等(2008)；Mg^#=Mg/(Mg+Fe).

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表 4 金堆城斑岩体Sr、Nd同位素数据

Table 4. Nd and Sr isotopic data of Jinduicheng granitic porphyry

样品	Rb(10^-6)	Sr(10^-6)	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr	Error(2s)	(⁸⁷Sr/⁸⁶Sr)_i	ε_Sr(143.7 Ma)
Q-JD-2	303.6	85.07	10.35	0.732 141	0.000 011	0.7109 998 49	94.65
Q-JD-1	303.9	51.86	17.01	0.743 934	0.000 011	0.709 188 977	68.94
Q-JD-3	288.6	130.82	6.39	0.721 431	0.000 011	0.708 378 637	57.43

样品	Sm(10^-6)	Nd(10^-6)	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	Error(2s)	(¹⁴³Nd/¹⁴⁴Nd)_i	ε_Nd(143.7 Ma)
Q-JD-2	2.514	8.603	0.176 7	0.511 995	0.000 013	0.511 828 86	-12.18
Q-JD-1	2.376	12.27	0.117 1	0.511 857	0.000 013	0.511 746 898	-13.78
Q-JD-3	3.374	17.24	0.118 3	0.511 891	0.000 013	0.511 779 77	-13.14
测试单位：中国科学院地质与地球物理研究所，2007.

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表 5 老牛山岩体Sr同位素数据

Table 5. Sr isotopic data of Laoniushan granite

样品	岩性	测定对象	Rb(10^-6)	Sr(10^-6)	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr	(⁸⁷Sr/⁸⁶Sr)_i	ε_Sr(144.5 Ma)
B20-1/1	花岗岩	全岩	0.481 82	0.345 79	1.393 4	0.713 29	0.710 427 947	86.54
B20-3/1	花岗岩	全岩	0.370 54	0.330 75	1.120 3	0.713 6	0.711 298 896	98.915
B20-3/3	花岗岩	全岩	0.002 089	0.183 76	0.011 367	0.705 31	0.705 286 652	13.55
B20-5/3	花岗岩	全岩	0.471 03	0.743 83	0.633 24	0.709 74	0.708 439 321	58.31
B20-5/5	花岗岩	全岩	0.525 13	0.552 92	0.949 73	0.710 15	0.708 199 248	54.90
B20-7/1	花岗岩	全岩	0.060 718	0.687 04	0.883 77	0.711 04	0.709 224 731	69.46
B20-7/1	花岗岩	长石	1.082 6	1.163 1	0.930 8	0.710 54	0.708 628 131	60.99
B20-7/1	花岗岩	云母	2.447 5	0.243 73	10.042	0.729 01	0.708 383 666	57.52
B20-7/1	花岗岩	云母	2.695 2	0.138 54	19.453 3	0.748 95	0.708 992 794	66.17
注：据尚瑞钧等(1988)数据重新计算初始值和ε_sr值.

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表 6 金堆城斑岩体Pb同位素数据

Table 6. Pb isotopic data of Jinduicheng Granitic porphyry

原编号	岩石类型	²⁰⁶Pb/²⁰⁴Pb	2σ	²⁰⁷Pb/²⁰⁴Pb	2σ	²⁰⁸Pb/²⁰⁴Pb	2σ
Q-JD-1	全岩	17.724 9	0.007	15.529 5	0.007	38.089 7	0.008
Q-JD-2	全岩	17.696 4	0.009	15.527 9	0.011	38.098 9	0.014
Q-JD-3	全岩	17.969 3	0.009	15.502 9	0.01	38.108 9	0.012
JD-1	钾长石	17.563 7	0.006	15.471 3	0.006	37.918 8	0.007
JD-2	钾长石	17.594 1	0.009	15.462 0	0.01	37.895 7	0.012
JD-3	钾长石	17.594 0	0.008	15.462 0	0.008	37.876 0	0.01
JDC-18^*	方铅矿	17.284		15.417		37.724
JDC-19^*	钾长石	17.536		15.434		37.680
LN-20^*	全岩	17.637		15.428		37.940
测试单位：中国科学院地质与地球物理研究所，2007；带^*样品黄典豪等(1984)；LN.老牛山，其他样品来自金堆城.

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