粤北大宝山矿区花岗闪长斑岩LA-ICP-MS锆石U-Pb年龄及其地质意义

王磊; 胡明安; 杨振; 陈开旭; 夏金龙

doi:10.3799/dqkx.2010.018

粤北大宝山矿区花岗闪长斑岩LA-ICP-MS锆石U-Pb年龄及其地质意义

doi: 10.3799/dqkx.2010.018

王磊^{1, 2},
胡明安^1, ,,
杨振¹,
陈开旭³,
夏金龙¹

1.
中国地质大学资源学院, 湖北武汉 430074
2.
中国地质大学地质过程与矿产资源国家重点实验室, 湖北武汉 430074
3.
中国地质调查局宜昌地质矿产研究所, 湖北宜昌 443003

基金项目:

国土资源部危机矿山接替资源找矿项目 220644088

详细信息

作者简介:
王磊(1981-), 男, 在读博士, 矿床学专业

通讯作者:
胡明安, E-mail: anminghu@tom.com

中图分类号: P597.3;P588.13;P618.65
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出版历程
- 收稿日期: 2009-02-26
- 刊出日期: 2010-03-01

Geochronology and Its Geological Implications of LA-ICP-MS Zircon U-Pb Dating of Granodiorite Porphyries in Dabaoshan Polymetallic Ore Deposit, North Guangdong Province

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
3.
Yichang Institute of Geology and Mineral Resources, China Geological Survey, Yichang 443003, China

摘要

摘要: 对粤北大宝山钼钨多金属矿区的花岗闪长斑岩进行了锆石阴极发光显微结构观察和LA-ICP-MS锆石微区U-Pb定年.在锆石阴极发光图像中, 两个花岗闪长斑岩样品中的锆石颗粒具有明显的振荡环带, 为典型的岩浆锆石.LA-ICP-MS U-Pb定年结果显示: 大宝山花岗闪长斑岩样品中具岩浆环带锆石区域12个分析点的²⁰⁶Pb/²³⁸U加权平均年龄为175.8±1.5 Ma(MSWD=0.037), 船肚花岗闪长斑岩样品中具岩浆环带锆石区域16个分析点的²⁰⁶Pb/²³⁸U加权平均年龄为175.0±1.7 Ma(MSWD=0.41).它们的形成时代约175 Ma, 为燕山早期第Ⅰ阶段(180~170 Ma)产物.本次对大宝山矿区花岗闪长斑岩形成时代的准确厘定, 为大宝山和船肚花岗闪长斑岩原本连为一体被后期构造错断的认识提供了新证据, 岩体错断部位是矿区Mo-W矿进一步勘探的重要方向.结合相关研究表明, 其成岩成矿动力学背景与邻区岩体相似, 为南岭地区同一期岩石圈伸展-减薄事件的产物.同时启示我们, 在南岭地区还存在燕山早期第一阶段(180~170 Ma)利于形成Mo-W矿的花岗岩类小岩体未被揭露.
- 花岗闪长斑岩 /
- 锆石 /
- LA-ICP-MS U-Pb定年 /
- 大宝山矿区
Abstract: The dating of LA-ICP-MS zircon U-Pb was carried out for granodiorite porphyries at Dabaoshan polymetallic ore deposit in North Guangdong Province. In cathodoluminescence (CL) image, most zircons in two granodiorite porphyry samples exhibit oscillatory zoning, which is typical for magmatic zircon. The dating of LA-ICP-MS zircon U-Pb of two samples shows the results that 12 points of oscillatory zoned domains of Dabaoshan granodiorite porphyry sample yields a group of weighted mean ²⁰⁶Pb/²³⁸U ages at (175.8±1.5)Ma (MSWD=0.037) and 16 points of oscillatory zoned domains of Chuandu granodiorite porphyry yields a group of weighted mean ²⁰⁶Pb/²³⁸U ages at (175.0±1.7) Ma (MSWD=0.41). So the epoch of granodiorite porphyry emplacement is nearly 175 Ma, belonging to the first stage of the early Yanshanian (180-170 Ma). According to the precise ages we have obtained, Dabaoshan and Chuandu granodiorite porphyries are a whole magamtic rock divided by the post-mineralization fault, and the faulted space is the most important direction for further exploration of Mo-W. The study, together with others, suggests that its geodynamic setting was the same as that of the near magamatic rocks, which formed in the same episode lithosphere extension event in Nanling region. In addition, we conclude that in the first stage of the early Yanshanian, some granodiorite porphyries favorable to forming Mo-W deposits have been undiscovered in Nanling region.
- granodiorite porphyry /
- zircon /
- LA-ICP-MS U-Pb geochronology /
- Dabaoshan ore deposit

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图 1 大宝山多金属矿区地质略图(葛朝华和韩发，1987；王建新，2006)

J₁ln.下侏罗统兰塘群；C₁dc.下石炭统大塘阶测水组；D₃t.上泥盆统天子岭组；D₂d^b.中泥盆统东岗岭组上亚组；D₂d^a.中泥盆统东岗岭组下亚组；D_1-2gt.中下泥盆统桂头群；∈.寒武系；1.矽卡岩型Mo-W矿；2.斑岩型钼钨矿带；3.褐铁矿铁帽；4.大宝山向斜；5.压性冲断裂；6.压扭性断裂；7.扭性断裂；8.地质界线；9.花岗闪长斑岩；10.次英安斑岩

Fig. 1. Sketch geological map of Dabaoshan polymetallic ore deposit

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图 2 花岗闪长斑岩样品ZK5404(a)和CD-22(b)中典型锆石阴极发光(CL)图像

Fig. 2. Typical CL images of zircons with ²⁰⁶Pb/²³⁸U ages for granodiorite porphyry samples ZK5404 (a) and CD-22 (b) at Dabaoshan ore deposit

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图 3 花岗闪长斑岩样品(ZK5404、CD-22)锆石U-Pb谐和图

Fig. 3. U-Pb concordia diagrams of zircons from granodiorite porphyry samples (ZK5404, CD-22) at Dabaoshan ore deposit

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表 1 粤北大宝山多金属矿区花岗闪长斑岩(样品ZK5404)单颗粒锆石U-Pb同位素测定结果

Table 1. Results of U-Pb isotopic dating for the single-grain zircon for granodiorite porphyry sample ZK5404 at Dabaoshan ore deposit, North Guangdong

样品编号	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁸Pb/²³²Th		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁸Pb/²³²Th		²⁰⁴Pb(10^-6)	²⁰⁶Pb(10^-6)	²⁰⁷Pb(10^-6)	²⁰⁸Pb(10^-6)	²³²Th(10^-6)	²³⁸U(10^-6)	Th/U
样品编号	比值	1σ	比值	1σ	比值	1σ	比值	1σ	t(Ma)	1σ	t(Ma)	1σ	t(Ma)	1σ	t(Ma)	1σ	²⁰⁴Pb(10^-6)	²⁰⁶Pb(10^-6)	²⁰⁷Pb(10^-6)	²⁰⁸Pb(10^-6)	²³²Th(10^-6)	²³⁸U(10^-6)	Th/U
ZK5404.1	0.051 0	0.001 6	0.194 8	0.005 9	0.027 7	0.000 5	0.008 3	0.000 2	240	39	181	5	176	3	167	4	< 1.67	184.53	10.18	4.76	290.97	1 588.95	0.18
ZK5404.2.1	0.050 9	0.001 6	0.194 0	0.006 0	0.027 6	0.000 5	0.008 3	0.000 2	238	41	180	5	176	3	167	4	< 1.89	168.70	9.31	5.84	357.54	1 457.70	0.25
ZK5404.2.2	0.080 5	0.003 2	1.863 9	0.065 8	0.167 9	0.002 9	0.050 2	0.000 8	1 210	79	1 068	23	1 000	16	989	15	< 1.62	910.54	83.16	54.39	505.54	1 288.85	0.39
ZK5404.3	0.054 4	0.001 7	0.207 6	0.006 5	0.027 7	0.000 5	0.008 7	0.000 2	388	40	192	5	176	3	176	4	< 1.17	197.51	11.66	10.05	583.35	1 705.71	0.34
ZK5404.4	0.052 5	0.001 6	0.201 3	0.005 9	0.027 8	0.000 5	0.008 7	0.000 2	307	37	186	5	177	3	175	4	< 2.06	205.94	11.73	9.19	535.85	1 770.03	0.30
ZK5404.5.1	0.099 5	0.003 6	3.086 1	0.096 5	0.224 9	0.003 9	0.065 7	0.001 1	1 615	68	1 429	24	1 308	20	1 286	20	< 1.26	471.05	51.98	12.22	85.60	500.58	0.17
ZK5404.5.2	0.058 4	0.001 9	0.223 1	0.007 2	0.027 7	0.000 5	0.008 2	0.000 2	544	41	204	6	176	3	164	4	< 1.91	186.23	11.84	8.39	523.33	1 611.08	0.32
ZK5404.6	0.050 7	0.002 1	0.193 6	0.007 9	0.027 7	0.000 5	0.008 6	0.000 3	225	60	180	7	176	3	173	6	< 2.22	128.54	7.10	4.48	265.43	1 112.07	0.24
ZK5404.7	0.054 2	0.002 9	0.205 6	0.010 2	0.027 5	0.000 5	0.008 6	0.000 1	381	122	190	9	175	3	173	3	1.53	230.35	15.04	12.27	633.62	1 999.39	0.32
ZK5404.8.1	0.052 1	0.002 0	0.199 5	0.007 5	0.027 8	0.000 5	0.008 3	0.000 3	291	53	185	6	176	3	167	5	< 1.70	218.92	12.49	8.21	503.68	1 897.17	0.27
ZK5404.8.2	0.050 8	0.002 6	0.252 0	0.012 5	0.036 0	0.000 7	0.009 1	0.000 4	233	78	228	10	228	4	183	8	< 1.79	41.13	2.29	1.11	62.03	275.17	0.23
ZK5404.9	0.053 7	0.002 0	0.203 2	0.007 4	0.027 5	0.000 5	0.008 7	0.000 3	357	49	188	6	175	3	175	5	1.85	180.16	10.59	7.95	465.83	1 579.51	0.29
ZK5404.10	0.052 2	0.002 5	0.240 9	0.011 3	0.033 5	0.000 7	0.011 8	0.000 4	292	71	219	9	212	4	237	9	< 1.39	56.51	3.23	2.57	111.18	406.21	0.27
ZK5404.11	0.050 6	0.002 0	0.193 4	0.007 4	0.027 7	0.000 5	0.008 4	0.000 3	224	55	180	6	176	3	170	5	< 1.47	147.67	8.22	5.65	341.81	1 285.71	0.27
ZK5404.12	0.050 0	0.002 0	0.190 7	0.007 6	0.027 7	0.000 5	0.008 4	0.000 3	195	57	177	6	176	3	168	6	< 1.34	207.77	11.43	5.83	356.19	1 813.27	0.20
ZK5404.13	0.158 7	0.005 8	6.872 4	0.247 2	0.314 1	0.005 9	0.088 4	0.002 7	2 442	36	2 095	32	1 761	29	1 713	51	< 1.64	205.92	35.96	20.98	121.01	158.29	0.76
ZK5404.14	0.051 7	0.002 9	0.195 8	0.010 5	0.027 5	0.000 5	0.008 6	0.000 1	272	132	182	9	175	3	174	3	< 1.57	163.65	10.21	7.09	358.70	1 429.96	0.25
ZK5404.15	0.055 7	0.002 2	0.544 5	0.021 4	0.070 8	0.001 3	0.020 6	0.000 7	442	54	441	14	441	8	412	13	< 1.35	243.09	14.93	20.58	510.13	829.28	0.62

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表 2 粤北大宝山多金属矿区花岗闪长岩(样品CD-22)单颗粒锆石U-Pb同位素测定结果

Table 2. Results of U-Pb isotopic dating for the single-grain zircon for granodiorite sample CD-22 at Dabaoshan ore deposit, North Guangdong

样品编号	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁸Pb/²³²Th		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁸Pb/²³²Th		²⁰⁴Pb(10^-6)	²⁰⁶Pb(10^-6)	²⁰⁷Pb(10^-6)	²⁰⁸Pb(10^-6)	²³²Th(10^-6)	²³⁸U(10^-6)	Th/U
样品编号	比值	1σ	比值	1σ	比值	1σ	比值	1σ	t(Ma)	1σ	t(Ma)	1σ	t(Ma)	1σ	t(Ma)	1σ	²⁰⁴Pb(10^-6)	²⁰⁶Pb(10^-6)	²⁰⁷Pb(10^-6)	²⁰⁸Pb(10^-6)	²³²Th(10^-6)	²³⁸U(10^-6)	Th/U
CD-22.1	0.063 1	0.003 3	0.241 9	0.012 5	0.027 8	0.000 6	0.008 5	0.000 3	710	75	220	10	177	4	172	5	< 1.12	28.13	1.92	3.92	231.55	242.08	0.96
CD-22.2	0.051 2	0.002 5	0.193 9	0.008 9	0.027 5	0.000 5	0.008 7	0.000 1	249	116	180	8	175	3	174	3	1.75	195.17	12.54	12.39	610.11	1 684.63	0.36
CD-22.3	0.057 2	0.001 9	0.501 0	0.016 3	0.063 6	0.001 1	0.019 6	0.000 5	498	42	412	11	397	7	392	10	< 1.21	162.13	10.07	13.94	359.81	611.61	0.59
CD-22.4	0.051 6	0.002 5	0.196 6	0.008 7	0.027 6	0.000 5	0.008 7	0.000 1	267	112	182	7	176	3	175	3	1.55	136.65	8.40	3.95	181.08	1 178.59	0.15
CD-22.5	0.054 1	0.002 7	0.204 9	0.009 7	0.027 4	0.000 5	0.008 6	0.000 1	377	116	189	8	175	3	173	3	2.51	117.48	7.65	6.01	307.37	1 022.55	0.30
CD-22.6	0.061 1	0.005 7	0.532 3	0.048 7	0.063 2	0.001 3	0.019 5	0.000 3	641	210	433	32	395	8	390	6	5.40	75.10	9.10	11.35	172.36	267.44	0.64
CD-22.7	0.050 3	0.001 7	0.192 4	0.006 5	0.027 7	0.000 5	0.008 2	0.000 2	209	46	179	6	176	3	164	5	< 0.92	122.28	6.72	4.16	258.79	1 062.08	0.24
CD-22.8	0.051 7	0.001 7	0.197 8	0.006 6	0.027 7	0.000 5	0.009 2	0.000 3	274	45	183	6	176	3	186	5	1.67	170.10	9.62	4.65	256.29	1 478.86	0.17
CD-22.9	0.050 4	0.002 5	0.191 0	0.008 6	0.027 5	0.000 5	0.008 7	0.000 1	213	114	177	7	175	3	174	3	1.85	200.33	12.20	7.73	376.77	1 746.03	0.22
CD-22.10	0.051 2	0.002 0	0.195 7	0.007 4	0.027 7	0.000 5	0.008 4	0.000 3	252	54	181	6	176	3	170	5	2.07	172.94	9.72	5.98	363.10	1 510.25	0.24
CD-22.11	0.047 9	0.001 8	0.183 5	0.006 9	0.027 8	0.000 5	0.008 2	0.000 3	93	55	171	6	177	3	164	5	< 1.43	181.74	9.54	6.23	390.86	1 582.09	0.25
CD-22.12	0.051 9	0.002 6	0.196 4	0.009 0	0.027 4	0.000 5	0.008 6	0.000 1	283	116	182	8	174	3	173	3	< 1.31	214.37	13.04	7.59	396.42	1 884.74	0.21
CD-22.13	0.049 1	0.001 9	0.206 0	0.008 0	0.030 4	0.000 6	0.008 9	0.000 3	154	56	190	7	193	4	179	6	< 1.43	211.99	11.44	8.79	507.27	1 689.70	0.30
CD-22.14.1	0.053 1	0.002 9	0.200 9	0.010 3	0.027 4	0.000 5	0.008 6	0.000 1	333	127	186	9	174	3	173	3	3.72	266.96	18.50	10.69	441.63	2 330.23	0.19
CD-22.15	0.052 0	0.006 0	0.191 1	0.021 6	0.026 7	0.000 6	0.008 4	0.000 2	284	260	178	18	170	4	169	4	8.03	275.11	25.72	32.08	1 243.65	2 332.14	0.53
CD-22.16	0.056 7	0.006 0	0.206 9	0.021 5	0.026 5	0.000 6	0.008 2	0.000 2	479	242	191	18	168	4	166	5	9.97	211.78	21.87	15.58	369.56	1 795.95	0.21
CD-22.17	0.054 5	0.006 6	0.207 4	0.024 5	0.027 6	0.000 9	0.008 2	0.000 6	392	209	191	21	176	5	165	12	< 2.83	15.11	0.94	1.38	81.72	128.43	0.64
CD-22.14.2	0.047 2	0.003 5	0.180 6	0.013 0	0.027 7	0.000 7	0.008 8	0.000 6	60	113	169	11	176	4	178	11	< 3.80	176.20	9.49	4.67	256.91	1 488.11	0.17
CD-22.2.2	0.049 5	0.003 4	0.189 1	0.012 6	0.027 7	0.000 7	0.008 3	0.000 5	173	108	176	11	176	4	166	9	2.96	243.94	13.85	14.00	821.31	2 060.96	0.40

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