巴基斯坦吉尼奥德矿区新元古代火山岩年代学及地质意义

徐剑南; 马昌前; 尹烁; 王连训; 顿新海

doi:10.3799/dqkx.2017.143

巴基斯坦吉尼奥德矿区新元古代火山岩年代学及地质意义

doi: 10.3799/dqkx.2017.143

1.
中国地质大学地球科学学院, 地质过程与矿产资源国家重点实验室, 湖北武汉 430074
2.
中冶集团武汉勘察研究院有限公司, 湖北武汉 430080

基金项目:

“中巴经济走廊”成矿背景综合研究引智计划 T2017005

国家自然科学基金项目 41272079

详细信息

作者简介:
徐剑南(1992-), 硕士研究生, 主要从事矿物学、岩石学、矿床学研究

通讯作者:
马昌前

中图分类号: P581
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出版历程
- 收稿日期: 2017-03-24
- 刊出日期: 2017-12-15

Chronology and Tectonic Implications of Neoproterozoic Volcanics from Chiniot Deposit, Pakistan

1.
State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Wuhan Surveying-Geotechnical Research Institute Co. Ltd. Of MCC Wuhan 430080, China

摘要

摘要: 罗迪尼亚超大陆的裂解及与之相关的吉尼奥德玢岩型铁矿的形成是目前研究的热点，对安山岩锆石进行了U-Pb年龄、Hf同位素和微量元素分析.所有锆石都属岩浆成因，具有一致的稀土配分型式以及明显的Ce正异常、Eu负异常和重稀土元素富集特征.锆石年龄主要分为两组，分别为947.8±4.0 Ma和883.0±5.1 Ma，代表两期安山岩的成岩年龄，指示安山岩为两期岩浆活动的混合产物；此外，捕获的基底锆石年龄为1 523.0±66 Ma，属于中元古代.ε_Hf（t）值变化范围较大（-4.67~+13.10），指示其为壳幔物质混合的产物.安山岩产生于罗迪尼亚超大陆时期，是由高温幔源岩浆通过底侵作用，使得中元古代花岗质岩石组成的下地壳发生熔融，壳幔熔体混合形成的，与伸展裂谷有关的构造热事件及地幔柱的活动有着密切关系.吉尼奥德铁矿与凯特里铜矿在成矿地质背景方面具有诸多相似性，暗示其有大型IOCG型矿床的成矿潜力.在960~880 Ma期间，印度板块西北部与华北-刚果-圣弗朗西斯科板块可能连接在一起.
- 巴基斯坦 /
- 安山岩 /
- 幔源 /
- 伸展裂谷 /
- 罗迪尼亚超大陆 /
- 地质年代学 /
- 岩石学
Abstract: This is a hotpoint that the study the breakup of Rodinia supercontinent and the formation of Chiniot iron oxide-apatite deposit, we report zircon U-Pb ages, Hf isotopic composition and REE contents of andesite. All the zircons are magmatic origin with the similar REE patterns which are enriched in HREE with a positive Ce anomaly and a negative Eu anomaly. The zircon U-Pb isotopic analyses yields ²⁰⁶Pb/²³⁸U ages of 947.8±4.0 Ma and 883.0±5.1 Ma, which can be interpreted as the crystallization ages of two stages of andesites. Besides, the inherited zircons with U-Pb age of 1 523.0±66 Ma may indicate a Mesoproterozoic basement. The igneous zircons have highly variable ε_Hf(t) values ranging from -4.67 to +13.10, indicating that the andesites were derived from partial melting of a mixed mantle sourse. The geochemical and isotopic variation suggest that mantle-derived basic magmas have went through some degree of crustal commination during migration through Mesoproterozoic granitoids. The formation of the andesites were induced by a series of tectono-thermal events, associated with extensional rift and mantle plume during Rodinia supercontinent. There are many similarities between Chiniotiron deposit and Khetri Copper Belt in geological setting of ore-forming processes, indicating that the metallogenetic potentiality of giant IOCG is very well. The northwest of Indian craton may have connection with North China-Congo-São Francisco craton between 960 Ma and 880 Ma.
- Pakistan /
- andesite /
- mantle-derived /
- extensional rift /
- Rodinia supercontinent /
- geochronology /
- petrology

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图 1 巴基斯坦构造简图

据Kazmi and Rana(1982)修改

Fig. 1. Tectonic sketch of Pakistan

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图 2 研究区地质简图

Fig. 2. Geological sketch of the study area

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图 3 吉尼奥德安山岩显微镜下(正交偏光)照片

Fig. 3. Photomicrographs(crossed nicols) of Chiniot andesite

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图 4 吉尼奥德安山岩锆石阴极发光(CL)图像及测点年龄

白色编号及圆圈为年龄测试点位及对应²⁰⁶Pb/²³⁸U(＜1 000 Ma)和²⁰⁷Pb/²⁰⁶Pb(＞1 000 Ma)年龄，直径32 μm；红色编号及圆圈为Hf同位素测试点位，直径44 μm

Fig. 4. Zircon CL images and ages of Chiniot andesite

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图 5 吉尼奥德安山岩锆石LA-ICP-MS锆石U-Pb年龄谐和图

Fig. 5. LA-ICP-MS zircon U-Pb concordia diagrams of Chiniot andesite

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图 6 吉尼奥德安山岩中锆石稀土元素球粒陨石标准化配分模式图

标准化值据Sun and McDonough(1989)

Fig. 6. Chondrite-normalized REE patterns of zircons from Chiniot andesite

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图 7 吉尼奥德安山岩锆石(Sm/La)_N vs. La判别图解

灰色区域：Boggy Plainzoned pluton的岩浆和热液锆石分布范围(Hoskin，2005); 据Kirkland et al.(2009)修改

Fig. 7. Discrimination plots of chondrite-normalized Sm/La ratio vs. La of Chiniot andesite zircons

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图 8 罗迪尼亚超大陆示意图

红点为研究区位置; 据Li et al.(2008)修改

Fig. 8. Schematic diagram of Rodinia supercontinent

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图 10 吉尼奥德安山岩锆石ε_Hf(t)频数分布直方图

Fig. 10. Histogram of ε_Hf(t) for zircons from Chiniot andesite

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图 9 吉尼奥德安山岩锆石Hf同位素与U-Pb年龄图解

Fig. 9. Diagram of ε_Hf(t) vs. U-Pb ages (a), ¹⁷⁶Hf/¹⁷⁷Hf vs. U-Pb ages (b) for zircons from Chiniot andesite

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图 11 罗迪尼亚超大陆重建

红点为研究区位置; 据Li et al.(2008)修改

Fig. 11. Reconstruction of Rodinia supercontinent

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表 1 吉尼奥德安山岩锆石LA-ICP-MS U-Pb年代学测试结果

Table 1. LA-ICP-MS U-Pb isotopic compositions of zircons for Chiniot andesite

测点号	含量(10^-6)		Th/U	同位素比值						年龄(Ma)						谐和度
测点号	²³²Th	²³⁸U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	谐和度
16PA-01	435	464	0.94	0.070 4	0.002 1	1.558 2	0.046 8	0.157 8	0.001 9	938.9	59.3	953.8	18.6	944.4	10.7	99%
16PA-02	272	339	0.80	0.072 0	0.002 4	1.578 9	0.048 6	0.157 8	0.002 2	987.0	66.7	962.0	19.2	944.3	12.2	98%
16PA-03	159	173	0.92	0.073 7	0.003 1	1.646 6	0.071 4	0.162 2	0.002 7	1 031.5	87.0	988.3	27.4	968.8	15.0	98%
16PA-04	519	525	0.99	0.070 2	0.002 4	1.549 2	0.050 9	0.157 6	0.002 1	1 000.0	73.2	950.2	20.3	943.7	11.4	99%
16PA-05	45	57	0.79	0.068 2	0.005 9	1.600 4	0.106 3	0.159 2	0.004 6	873.8	179.6	970.4	41.5	952.2	25.8	98%
16PA-06	198	342	0.58	0.068 3	0.002 8	1.493 3	0.056 9	0.157 7	0.002 3	875.9	87.0	927.7	23.2	943.8	13.0	98%
16PA-07	1160	583	1.99	0.066 6	0.002 1	1.466 5	0.044 7	0.157 7	0.002 1	833.3	61.0	916.7	18.4	943.8	11.9	97%
16PA-08	133	595	0.22	0.067 1	0.002 9	1.554 5	0.055 7	0.162 4	0.002 6	842.6	88.9	952.3	22.2	970.3	14.5	98%
16PA-10	186	757	0.25	0.069 4	0.002 5	1.530 9	0.054 1	0.157 8	0.001 8	922.2	73.3	942.8	21.7	944.4	9.9	99%
16PA-11	153	245	0.63	0.094 1	0.003 8	3.620 4	0.135 0	0.275 0	0.005 1	1 510.8	75.9	1 554.0	29.7	1 566.0	25.7	99%
16PA-12	413	458	0.90	0.069 0	0.002 7	1.523 7	0.077 2	0.157 7	0.003 1	898.2	86.1	940.0	31.1	944.2	17.2	99%
16PA-13	357	461	0.78	0.067 7	0.002 2	1.381 4	0.048 3	0.146 8	0.002 2	861.1	68.5	881.0	20.6	882.9	12.5	99%
16PA-15	232	534	0.44	0.067 1	0.002 1	1.363 0	0.043 7	0.146 5	0.002 1	838.9	66.7	873.1	18.8	881.3	12.1	99%
16PA-16	376	289	1.30	0.094 8	0.002 6	3.559 8	0.100 8	0.271 7	0.003 8	1 524.1	51.9	1 540.6	22.5	1 549.7	19.4	99%
16PA-17	306	468	0.65	0.070 1	0.002 2	1.420 6	0.046 8	0.146 3	0.002 3	931.5	64.8	897.6	19.7	880.3	13.0	98%
16PA-18	460	535	0.86	0.069 4	0.001 7	1.408 9	0.035 0	0.147 1	0.002 0	909.3	51.9	892.7	14.8	884.7	11.2	99%
16PA-19	335	385	0.87	0.069 0	0.002 2	1.400 6	0.042 0	0.146 7	0.001 8	898.2	64.0	889.2	17.8	882.7	9.9	99%
16PA-20	277	317	0.87	0.095 0	0.002 7	3.481 1	0.094 0	0.265 3	0.003 7	1 528.7	53.7	1522.9	21.3	1516.9	18.9	99%

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表 2 吉尼奥德安山岩锆石稀土元素分析结果(10^-6)

Table 2. Rare earth element (10^-6) data of zircons for Chiniot andesite

测点号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	δEu	δCe	∑REE	LREE/HREE
16PA-01	0.06	15.25	0.45	11.54	16.91	3.23	118.06	38.93	475.33	179.74	759.92	153.49	1 389.16	232.20	0.162	9.96	3 394.26	0.014
16PA-02	0.31	15.51	0.41	5.32	11.79	2.03	68.36	23.72	295.59	112.68	482.85	101.98	933.16	159.14	0.171	8.98	2 212.86	0.016
16PA-03	0.71	25.53	0.33	6.29	10.48	2.32	64.54	21.38	272.11	104.13	463.67	101.93	994.03	187.42	0.209	12.84	2 254.86	0.021
16PA-04	0.90	24.13	0.76	12.50	24.13	2.85	139.48	45.73	572.62	212.61	899.18	182.75	1 581.89	273.34	0.118	6.71	3 972.87	0.017
16PA-05	0.29	32.48	0.06	0.79	4.68	1.80	20.23	6.48	79.61	28.76	137.65	34.83	358.46	73.96	0.482	56.22	780.08	0.054
16PA-06	0.01	12.49	0.07	2.71	3.32	1.40	16.97	6.70	92.75	41.94	238.14	67.16	815.94	188.11	0.463	50.18	1 487.70	0.014
16PA-07	0.27	105.00	1.36	20.47	30.08	7.76	143.59	44.17	515.59	187.53	817.33	176.16	1 648.31	297.43	0.299	22.19	3 995.07	0.043
16PA-08	0.03	3.07	0.21	2.94	7.55	0.44	71.06	25.78	314.13	114.45	486.21	100.27	918.33	155.39	0.038	4.34	2 199.86	0.007
16PA-10	0.24	8.04	0.34	2.74	11.03	1.65	92.97	38.81	510.64	175.96	721.34	148.77	1 323.80	227.57	0.109	5.78	3 263.90	0.007
16PA-11	0.13	23.19	0.27	4.56	11.63	1.55	78.58	24.43	311.12	120.59	529.44	114.26	1 039.62	185.62	0.117	22.07	2 445.00	0.017
16PA-12	2.21	74.69	2.26	13.05	10.52	3.66	45.50	17.28	213.17	85.31	446.10	113.93	1 274.24	267.31	0.435	7.37	2 569.23	0.043
16PA-13	0.24	20.15	0.27	3.41	9.77	1.21	57.55	21.39	286.23	108.49	485.47	103.23	968.87	171.14	0.121	17.19	2 237.43	0.016
16PA-15	0.36	8.92	0.77	6.32	13.95	2.53	47.38	12.69	114.42	36.67	152.60	33.66	381.21	73.90	0.271	3.03	885.39	0.039
16PA-16	0.96	138.69	0.47	5.92	11.60	1.75	59.34	22.46	286.47	113.28	523.86	118.96	1 174.24	205.44	0.166	50.15	2 663.46	0.064
16PA-17	0.76	16.80	0.96	11.65	16.49	2.24	92.55	38.05	458.43	173.49	785.64	171.08	1 613.61	272.53	0.138	4.12	3 654.29	0.014
16PA-18	0.14	19.75	0.34	9.04	21.23	2.28	124.82	44.49	531.59	200.99	877.82	190.20	1 731.93	290.67	0.105	15.30	4 045.29	0.013
16PA-19	1.30	16.90	0.70	7.86	13.24	2.27	85.81	27.12	338.57	127.22	552.66	113.93	1 062.94	177.21	0.155	4.30	2 527.73	0.017
16PA-20	0.11	57.14	0.73	11.93	23.68	4.02	116.90	36.54	437.20	166.56	729.25	159.37	1 527.51	262.17	0.192	23.05	3 533.10	0.028

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表 3 吉尼奥德安山岩锆石Lu-Hf同位素组成

Table 3. Zircon Lu-Hf isotopic compositions for the Chiniot andesite

测点号	年龄(Ma)	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	1σ	ε_Hf(0)	ε_Hf(t)	t_DM1(Ma)	t_DM2(Ma)	f_Lu/Hf
16PA-01	948	0.039 999	0.001 5	0.282 193	0.000 017	-20.5	-0.47	1 513	1 726	-0.95
16PA-02	948	0.028 189	0.001 1	0.282 169	0.000 014	-21.3	-1.04	1 529	1 757	-0.97
16PA-03	948	0.018 261	0.000 7	0.281 689	0.000 018	-38.3	-17.80	2 171	2 670	-0.98
16PA-04	948	0.032 286	0.001 4	0.282 473	0.000 016	-10.6	9.50	1 114	1 178	-0.96
16PA-05	948	0.030 862	0.001 1	0.282 138	0.000 014	-22.4	-2.19	1 575	1 820	-0.97
16PA-06	948	0.004 009	0.000 1	0.282 354	0.000 017	-14.8	6.10	1 240	1 365	-1.00
16PA-07	948	0.008 419	0.000 4	0.282 531	0.000 017	-8.5	12.22	1 003	1 027	-0.99
16PA-08	948	0.016 916	0.000 8	0.282 457	0.000 016	-11.1	9.34	1 118	1 186	-0.98
16PA-09	1523	0.034 658	0.001 3	0.281 955	0.000 016	-28.9	4.02	1 837	1 952	-0.96
16PA-10	883	0.030 309	0.001 1	0.282 179	0.000 015	-21.0	-2.12	1 517	1 765	-0.97
16PA-11	883	0.040 152	0.001 6	0.282 337	0.000 018	-15.4	3.23	1 311	1 471	-0.95
16PA-12	883	0.006 677	0.000 3	0.282 318	0.000 012	-16.0	3.31	1 294	1 467	-0.99
16PA-13	883	0.040 720	0.001 6	0.282 114	0.000 016	-23.3	-4.67	1 626	1 904	-0.95
16PA-14	1523	0.040 086	0.001 6	0.282 051	0.000 019	-25.5	7.12	1 717	1 783	-0.95
16PA-15	883	0.025 434	0.001 0	0.282 190	0.000 016	-20.6	-1.64	1 496	1 739	-0.97
16PA-16	948	0.026 902	0.001 1	0.281 739	0.000 014	-36.5	-16.27	2 125	2 587	-0.97
16PA-17	948	0.025 834	0.001 1	0.282 569	0.000 014	-7.2	13.10	970	978	-0.97
16PA-18	948	0.039 073	0.001 5	0.282 211	0.000 013	-19.8	0.21	1 486	1 688	-0.96
16PA-19	948	0.025 073	0.001 0	0.282 416	0.000 012	-12.6	7.75	1 181	1 274	-0.97
16PA-20	948	0.016 708	0.000 6	0.282 163	0.000 013	-21.5	-1.00	1 521	1 755	-0.98

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