川南平川镁铁质-超镁铁质岩锆石U-Pb年龄及地质意义

曾令高; 张均; 孙腾; 郭东宝

doi:10.3799/dqkx.2013.118

川南平川镁铁质-超镁铁质岩锆石U-Pb年龄及地质意义

doi: 10.3799/dqkx.2013.118

曾令高^{1, 2, 3,},
张均²,
孙腾²,
郭东宝⁴

1.
新疆地矿局第九地质大队, 新疆乌鲁木齐 830000
2.
中国地质大学资源学院, 湖北武汉 430074
3.
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
4.
中国地质大学地球科学学院, 湖北武汉 430074

基金项目:

全国危机矿山找矿专项项目"宁芜及川西陆相次火山岩型铁铜矿床成矿规律总结研究" 20109904

详细信息

作者简介:
曾令高(1983-), 男, 硕士, 主要从事成矿规律与成矿预测方面的研究工作.E-mail: lgzeng100@163.com

中图分类号: P595;P597
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出版历程
- 收稿日期: 2012-12-30
- 刊出日期: 2013-06-01

Zircon U-Pb Age of Mafic-Ultramafic Rock from Pingchuan Region in Southern Sichuan and Its Geological Implications

ZENG Ling-gao^{1, 2, 3
,},
ZHANG Jun²,
SUN Teng²,
GUO Dong-bao⁴

1.
No.9 Geological Brigade, Xinjiang Bureau of Geology and Mineral Resources, Urumqi 830000, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
4.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 为探讨镁铁质-超镁铁质岩的岩石学特征及成岩成矿作用时间序列, 完善区域成岩成矿年代学格架, 对平川地区的镁铁质-超镁铁质岩进行了元素地球化学分析和LA-ICP-MS锆石U-Pb定年.测试结果显示, 黄草坪辉长岩成岩年龄为259.7±1.2 Ma, 其捕获锆石结晶年龄为269.8±2.4 Ma, 辉绿(玢)岩等次火山岩参考成岩年龄为248± Ma, 其变质锆石年龄为67± Ma.研究结果表明, 平川地区的镁铁质-超镁铁质岩产出于大陆裂谷环境, 岩浆源区来自上地幔尖晶石相二辉橄榄岩, 为一套同源异相有利于铁矿化形成的富钠质拉斑玄武质岩石系列.岩浆活动开始孕育时间不晚于269.8±2.4 Ma, 大规模岩浆活动发生于259.7±1.2 Ma, 其约束了岩浆分异型和火山喷发(溢)沉积型矿化的成矿时间, 次火山岩的成岩年龄约束了次火山热液型矿化的成矿时间上限, 变质锆石U-Pb年龄记录了平川地区经历了喜马拉雅期陆内造山作用.平川地区构造岩浆活动具有爆发性、阶段性和成矿专属性等特点, 镁铁质-超镁铁质岩的形成可能与岩石圈的大规模减薄作用有关, 攀西地区海西-印支期的成岩-成矿作用为同源岩浆受区域统一深部地球动力学背景约束演化的异相产物.
- 锆石 /
- 镁铁质-超镁铁质岩 /
- 成岩成矿作用 /
- 平川地区 /
- 地球化学
Abstract: LA-ICP-MS zircon U-Pb dating and elements geochemical analysis has been carried out for mafic-ultramafic rock from Pingchuan to discuss the petrology characteristics and the time series of diagenesis-mineralization in Pingchuan region and further improve the geochronological framework of diagenesis-mineralization of the Panxi area. The test results show that Huangcaoping gabbro formed in 259.7±1.2 Ma and its capture zircon's crystallization age is 269.8±2.4 Ma, and the subvolcanic's reference diagenetic age is 248± Ma and its metamorphic zircon age is 67± Ma. The results indicate that mafic-ultramafic rock in Pingchuan region is a set of homologous phase sodium-rich tholeiitic rock series, conduciving to the formation of iron-mineralization, outputting in the continental rift environment, magma source coming from the upper mantle spinel lherzolite. The magmatic activity started no later than 269.8±2.4 Ma, and the large-scale magmatic activity occurred at 259.7±1.2 Ma, which constrained the mineralization time of magmatic profiled and volcanic eruptions (underflow) sedimentary, and the subvolcanic diagenetic age limited the upper mineralization time of sub-volcanic hydrothermal, and the metamorphic zircon U-Pb age recorded that Pingchuan region experienced Himalayan intracontinental orogeny. The tectonic-magmatic activity of Pingchuan region is featured with being explosive, phased and metallogenic; the formation of mafic-ultramafic rock in Pingchuan region is probably related to the large-scaled lithospheric thinning; diagenesis-mineralization in Hercynian-Indosinian in Panxi area is the comagmatic product of different phases evolution, controlled by regional uniform deep geodynamics.
- zircon /
- mafic-ultramafic rock /
- diagenesis-mineralization /
- pingchuan region /
- geochemistry

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图 1 平川铁矿地质矿产略图(据①修编)

Fig. 1. Sketch map of geological and mineral of Pingchuan iron deposit

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图 2 大杉树辉长岩锆石阴极发光(CL)图像及测试位置

Fig. 2. Zircon cathodoluminescence (CL) images and test position of Dashanshu gabbro

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图 3 平川地区镁铁质-超镁铁质岩Harker图解

Fig. 3. Harker diagram of mafic-ultramafic rock in Pingchuan region

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图 4 平川地区镁铁质-超镁铁质岩稀土元素球粒陨石标准化分布型式

Fig. 4. Chondrite-normalized REE distribution patterns of mafic-ultramafic rock in Pingchuan region

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图 5 平川地区镁铁质-超镁铁质岩微量元素原始地幔标准化配分曲线

Fig. 5. Primitive mantle-normalized trace element partition curves of mafic-ultramafic rock in Pingchuan region

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图 6 平川地区大杉树辉长岩锆石稀土元素球粒陨石配分曲线

Fig. 6. Zircon chondrite-normalized REE distribution patterns of Dashanshu gabbro in Pingchuan region

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图 7 平川地区火山岩构造环境判别图解(底图a仿赵崇贺等，1989；底图b仿莫宣学等，1993；前人数据引自①③)

A.大洋玄武岩区；B.(CONRVB)玄武岩；IAB.岛弧玄武岩；TrB.过渡型玄武岩；OAB.大洋碱性玄武岩；CONB.大陆玄武-大陆裂谷型玄武岩；C.岛弧造山带玄武岩；OFB.大洋岩

Fig. 7. Volcanic tectonic discrimination in Pingchuan

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图 8 平川地区大杉树辉长岩锆石U-Pb协和图

Fig. 8. U-Pb concordia plots for zircons of Dashanshu gabbro in Pingchuan region

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图 9 平川地区火山岩岩石系列划分图解(前人数据引自①③)

TH.拉斑玄武岩系列；CA.钙碱性玄武岩系列；HK.高钾类型；K.钾质类型；Na.钠质类型

Fig. 9. Volcanic rock series in Pingchuan region

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图 10 (Tb/Yb)_PM和(Yb/Sm)_PM图解(底图据张招崇等, 2006)

Fig. 10. Relation of (Tb/Yb)_PM and (Yb/Sm)_PM

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图 11 (Th/Ta)_PM和(La/Nb)_PM图解(底图据Neal et al., 2002)

Fig. 11. Relation of (Th/Ta)_PM and (La/Nb)_PM

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表 1 平川地区镁铁质-超镁铁质岩常量元素含量及特征值

Table 1. Table of eigenvalue and content of major elements of mafic-ultramafic rock in Pingchuan region

样号	岩石类型	化学成分(%)											特征值
样号	岩石类型	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	FeO′
ZK21101-2	细粒玄武岩	51.57	2.19	14.47	3.30	7.21	0.20	6.94	10.90	2.15	0.84	0.24	10.18
ZK21201-9	块状玄武岩	50.31	1.97	14.03	2.87	8.30	0.19	8.63	9.71	3.02	0.73	0.24	10.88
ZK21503-1	含杏仁体玄武岩	53.56	1.77	14.62	3.10	7.21	0.18	6.70	8.79	2.68	1.17	0.21	10.00
ZK22001-1	灰绿色玄武岩	50.14	2.30	14.28	5.81	5.98	0.21	6.26	11.83	1.90	1.04	0.25	11.21
ZK22001-3	杏仁体玄武岩	53.96	2.06	14.52	2.09	7.19	0.18	5.65	9.94	4.10	0.06	0.24	9.07
ZK22101-2	含杏仁体玄武岩	52.32	2.15	14.88	3.34	7.22	0.18	6.88	8.42	4.29	0.07	0.26	10.22
ZK22101-10	块状玄武岩	50.74	2.21	14.61	3.64	7.76	0.25	7.52	8.34	3.12	1.58	0.24	11.03
ZK22101-14	铁质凝灰岩	44.79	1.15	11.75	11.81	7.95	0.36	8.50	11.31	1.88	0.07	0.42	18.58
LZC-3	斑状玄武岩	49.62	1.99	13.97	5.01	7.05	0.21	7.57	11.76	2.03	0.52	0.26	11.56
CK10201-1	粗粒辉长岩	51.44	2.93	14.91	5.53	5.27	0.14	4.93	9.07	5.01	0.58	0.18	10.25
CK10201-4	细粒辉长岩	50.41	1.95	14.75	2.56	8.25	0.19	6.85	9.57	4.73	0.54	0.20	10.56
CK10201-6	中粗粒辉长岩	50.46	1.70	15.59	3.85	5.68	0.22	7.87	9.69	3.89	0.91	0.15	9.15
CK10201-7	中-细粒矿化辉长岩	47.19	1.52	14.56	3.00	11.23	0.13	7.35	11.28	3.15	0.46	0.14	13.93
CK10201-8	中-细粒辉长岩	49.94	1.59	15.36	3.94	5.63	0.13	7.77	11.53	3.39	0.58	0.14	9.17
DPZ-1	中-粗粒辉长岩	49.90	0.95	15.84	2.50	7.00	0.19	9.06	10.30	2.92	1.25	0.09	9.24
DPZ-3	粗粒辉长岩	49.93	1.98	12.95	5.81	7.23	0.22	7.15	10.29	3.81	0.36	0.28	12.46
DPZ-71-2	辉绿辉长岩	49.07	2.73	15.53	2.92	10.19	0.20	5.92	8.49	3.86	0.86	0.24	12.81
DPZ-74	中细粒辉长岩	50.55	1.72	12.85	4.36	5.26	0.16	9.14	11.12	4.38	0.30	0.16	9.19
ZK3002-5-1	细粒辉长岩	52.48	0.89	16.31	3.12	5.99	0.17	6.68	11.30	2.63	0.36	0.07	8.79
ZK3002-14	中-粗粒矿化辉长岩	46.07	2.71	13.05	9.24	9.34	0.19	5.97	10.13	2.69	0.55	0.05	17.65
ZK3002-18	矿化粗粒辉长岩	44.55	2.26	13.00	2.73	18.10	0.19	5.50	10.01	2.92	0.68	0.07	20.56
ZK3002-19	中粗粒辉长岩	52.08	1.03	15.11	3.89	4.97	0.18	6.69	11.85	3.25	0.88	0.07	8.47
ZK3002-20	矿化细粒辉长岩	43.43	2.57	13.36	9.63	10.81	0.20	6.90	10.50	2.15	0.40	0.05	19.48
K-8	辉绿岩	44.74	1.39	8.73	2.70	9.35	0.30	24.25	7.92	0.41	0.09	0.12	11.78
K-10	辉绿岩	46.42	0.01	9.08	1.58	12.06	0.17	23.44	7.01	0.01	0.12	0.10	13.48
K-14	辉绿岩	44.14	1.09	8.21	3.92	7.91	0.20	25.41	8.77	0.20	0.04	0.10	11.44
K-41	辉绿岩	44.88	1.20	9.05	3.01	8.43	0.17	23.78	8.56	0.52	0.30	0.10	11.14
K-244	辉绿岩	45.78	1.22	8.84	3.68	9.47	0.26	22.57	7.73	0.31	0.03	0.10	12.78
K-13	苦橄岩	44.93	1.22	9.41	3.84	7.61	0.20	22.20	9.07	1.12	0.31	0.09	11.06
K-15	苦橄岩	45.20	1.23	9.65	3.66	7.69	0.19	21.66	9.11	1.23	0.27	0.09	10.99
K-18	苦橄岩	44.19	1.04	8.27	2.92	8.78	0.20	25.22	7.88	1.19	0.22	0.09	11.41
K-246-2	苦橄岩	45.31	1.16	8.55	2.65	9.21	0.19	23.17	8.20	1.32	0.14	0.09	11.59
K-246-3	苦橄岩	46.05	1.13	8.86	3.04	9.09	0.20	21.65	8.32	1.31	0.21	0.12	11.83
K-171	苦橄岩	45.37	1.20	8.36	4.30	7.75	0.19	23.80	7.82	0.88	0.23	0.10	11.62
注：氧化物含量已换算成100%，分析数据由澳实分析检测(广州)有限公司测定.

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表 2 平川地区镁铁质-超镁铁质岩微量元素含量及特征值

Table 2. Eigenvalues and contents of Trace elements of mafic-ultramafic rock in Pingchuan region

样号	岩石名称	元素(10^-6)																									特征值
样号	岩石名称	Rb	Ba	Th	U	Ta	Nb	La	Ce	Pb	Pr	Sr	Nd	Zr	Hf	Sm	Eu	Dy	Y	Ho	Yb	Lu	Gd	Tb	Er	Tm	∑REE	LREE/HREE	δEu	δCe
ZK21101-2	细粒玄武岩	20.1	1140	2.2	0.5	1.06	17.4	18.2	37.7	4.5	5.15	503	22.7	136.0	3.7	5.40	1.97	4.90	23.9	0.91	2.14	0.32	5.45	0.89	2.52	0.35	108.60	5.21	1.10	0.94
ZK21201-9	块状玄武岩	23.3	660	2.4	0.6	1.26	20.9	21.0	44.5	3.3	5.42	487	22.6	142.5	3.8	5.33	1.72	4.88	27.3	1.02	2.30	0.31	5.95	0.95	2.78	0.39	119.15	5.41	0.93	1.00
ZK21503-1	含杏仁体玄武岩	43.1	280	2.0	0.5	0.98	15.0	21.8	43.5	5.7	5.57	397	22.9	123.0	3.4	5.09	1.73	4.27	21.6	0.78	1.81	0.26	5.33	0.76	2.21	0.29	116.30	6.40	1.01	0.94
ZK22001-1	灰绿色玄武岩	32.9	450	2.3	0.6	1.23	17.9	21.8	47.7	7.6	6.17	718	26.7	91.5	3.2	6.18	2.11	4.97	24.6	0.94	2.13	0.33	6.00	0.96	2.54	0.37	128.90	6.07	1.05	0.99
ZK22001-3	杏仁体玄武岩	2.8	110	1.9	0.5	1.11	17.3	18.8	42.1	5.0	5.74	426	25.5	115.5	3.3	5.88	2.24	4.83	23.4	0.93	2.19	0.31	5.84	0.92	2.51	0.35	118.14	5.61	1.16	0.98
ZK22101-2	含杏仁体玄武岩	2.2	90	2.5	0.7	1.18	18.5	24.3	50.5	4.9	6.21	376	26.0	177.5	4.7	6.00	2.05	4.93	26.4	1.04	2.21	0.30	6.21	1.02	2.67	0.36	133.80	6.14	1.02	0.98
ZK22101-10	块状玄武岩	44.6	1310	2.5	0.6	1.12	17.8	24.4	48.6	10.8	5.54	335	24.0	159.0	4.2	5.25	2.00	4.33	23.0	0.84	1.82	0.26	5.32	0.83	2.33	0.29	125.81	6.85	1.15	0.98
ZK22101-14	铁质凝灰岩	3.8	10000	3.9	4.2	0.63	11.4	51.1	72.6	160.5	6.40	807	22.9	100.5	2.7	4.46	4.46	4.19	25.0	0.87	2.22	0.34	4.84	0.77	2.54	0.35	178.04	10.04	2.92	0.84
LZC-3	斑状玄武岩	11.8	190	1.3	0.3	0.84	12.9	13.8	30.4	3.8	4.59	355	21.1	87.3	2.7	5.31	1.89	5.23	25.7	0.97	2.30	0.32	5.72	0.94	2.69	0.38	95.64	4.16	1.04	0.93
CK10201-1	中粗粒辉长岩	15.2	540	3.1	0.3	1.53	22.9	15.2	33.1	2.3	3.98	450	19.8	51.5	2.0	4.81	1.85	5.10	29.5	1.06	2.61	0.41	5.32	0.91	3.08	0.43	97.66	4.16	1.11	1.02
CK10201-4	细粒辉长岩	14.5	360	3.1	0.5	1.22	19.0	20.4	46.1	14.4	5.23	398	21.0	113.5	3.4	4.99	1.49	4.75	25.6	0.88	2.26	0.33	5.42	0.86	2.54	0.36	116.61	5.70	0.87	1.07
CK10201-6	中粗粒辉长岩	17.8	470	1.4	0.3	0.70	11.0	13.2	26.2	1.1	3.44	362	15.5	57.1	2.0	3.92	1.28	4.21	21.0	0.83	2.11	0.31	4.30	0.72	2.35	0.35	78.72	4.19	0.95	0.93
CK10201-7	中-细粒矿化辉长岩	11.5	210	1.8	0.3	0.62	9.9	10.5	25.8	4.8	3.11	429	13.7	60.6	1.9	3.79	1.18	3.60	21.0	0.73	1.81	0.26	3.98	0.67	2.03	0.28	71.44	4.35	0.92	1.09
DPZ-1	中-粗粒辉长岩	29.3	420	1.4	0.2	0.39	6.4	7.1	17.3	4.5	2.08	260	9.0	27.4	0.9	2.43	0.99	3.04	17.2	0.62	1.65	0.22	2.98	0.52	1.72	0.27	49.92	3.53	1.12	1.09
DPZ-71-2	辉绿辉长岩	22.2	280	1.8	0.4	1.07	16.6	16.1	37.2	2.1	5.54	542	25.6	120.0	3.4	6.61	2.47	6.63	31.8	1.26	2.96	0.43	7.22	1.18	3.49	0.49	117.18	3.95	1.09	0.96
DPZ-74	中细粒辉长岩	10.6	320	2.7	0.3	1.02	15.1	15.6	34.5	3.2	4.77	223	19.8	75.4	2.5	4.70	1.40	4.45	22.6	0.86	2.24	0.32	5.13	0.79	2.56	0.35	97.47	4.84	0.87	0.97
ZK3002-4	中-细粒辉长岩	13.7	180	1.7	0.3	0.30	4.8	8.1	17.2	2.7	1.99	253	8.7	48.6	1.6	2.60	0.85	3.49	20.6	0.72	1.86	0.28	3.17	0.59	2.06	0.30	51.91	3.16	0.90	1.02
ZK3002-5	细粒辉长岩	9.4	170	1.5	0.3	0.24	3.8	6.4	13.5	4.1	1.68	276	7.4	47.9	1.4	2.10	0.85	2.82	16.6	0.58	1.52	0.22	2.50	0.45	1.73	0.25	42.00	3.17	1.13	0.99
ZK3002-18	矿化粗粒辉长岩	23.1	190	1.6	0.3	0.32	5.0	7.8	17.9	4.5	2.09	261	9.3	39.6	1.4	2.69	1.01	3.67	21.2	0.73	1.98	0.28	3.21	0.62	2.15	0.33	53.76	3.14	1.05	1.07
ZK3002-20	矿化细粒辉长岩	11.1	140	1.3	0.2	0.25	4.1	6.2	13.4	5.3	1.59	205	7.3	46.3	1.5	2.10	0.72	2.95	16.6	0.58	1.62	0.23	2.54	0.47	1.72	0.26	41.68	3.02	0.95	1.02
ZK21301-1	辉绿岩	13.3	420	2.1	0.5	1.04	17.1	18.0	38.6	7.5	5.28	429	23.3	111.0	3.1	5.51	1.99	5.10	23.6	0.96	2.23	0.32	5.70	0.94	2.61	0.37	110.91	5.08	1.08	0.96
K-8	辉绿岩	2.9	30	0.6	0.2	0.46	7.0	6.1	15.5	1.9	1.94	106.5	8.5	69.1	2.0	2.42	0.95	2.95	16.7	0.57	1.49	0.19	2.91	0.54	1.64	0.24	45.94	3.36	1.09	1.10
K-14	辉绿岩	3.0	60	0.6	0.2	0.42	6.5	6.2	13.8	0.7	1.80	53.5	8.1	48.5	1.5	2.09	0.81	2.54	13.8	0.55	1.26	0.16	2.60	0.45	1.41	0.21	41.98	3.57	1.06	1.00
K-41	辉绿岩	17.3	20	0.7	0.2	0.49	7.6	6.6	15.3	1.9	1.82	89.1	7.6	50.3	1.6	2.12	0.86	2.61	14.4	0.53	1.24	0.19	2.41	0.49	1.50	0.19	43.46	3.74	1.16	1.06
K-244	辉绿岩	0.8	20	0.6	0.2	0.41	5.9	6.5	13.3	1.5	2.00	38.8	8.9	55.0	1.7	2.43	0.87	2.80	14.8	0.55	1.31	0.18	3.00	0.46	1.60	0.21	44.11	3.36	0.98	0.90
K-13	苦橄岩	10.5	230	0.7	0.2	0.48	7.2	7.5	17.7	9.0	2.02	183	8.7	71.0	1.9	2.37	0.89	2.81	16.1	0.57	1.29	0.19	2.71	0.51	1.48	0.23	48.97	4.00	1.07	1.09
K-15	苦橄岩	8.2	230	0.7	0.2	0.50	7.6	7.7	16.8	3.9	2.18	183	9.7	75.5	2.0	2.61	1.04	3.09	16.8	0.66	1.50	0.20	0.0	0.0	0.0	0.0	40.56	3.65	1.05	1.10
K-18	苦橄岩	5.8	190	0.6	0.2	0.38	5.7	5.7	14.2	2.6	1.72	188	7.4	66.9	1.8	2.05	0.77	2.38	13.7	0.50	1.17	0.17	2.43	0.44	1.43	0.20	47.29	3.68	1.06	0.95
K-246-2	苦橄岩	4.1	70	0.6	0.2	0.41	5.8	7.5	15.3	3.3	2.01	194	9.0	64.2	1.8	2.46	0.92	2.84	14.5	0.56	1.38	0.20	2.86	0.47	1.56	0.23	47.49	3.61	0.97	0.86
K-246-3	苦橄岩	5.1	140	0.6	0.2	0.43	6.2	7.7	14.5	4.4	2.14	257	9.4	62.1	1.9	2.55	0.89	2.90	14.7	0.55	1.32	0.19	3.06	0.48	1.59	0.22	44.29	3.47	1.08	0.88
K-171	苦橄岩	8.8	110	0.5	0.2	0.39	5.7	7.6	13.8	4.1	1.80	170	8.1	61.1	1.7	2.22	0.87	2.84	14.2	0.56	1.35	0.20	2.72	0.47	1.53	0.23	108.60	5.21	1.10	0.94
注：分析数据由澳实分析检测(广州)有限公司测定.

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表 3 平川地区镁铁质-超镁铁质岩锆石U-Pb年代学分析结果

Table 3. The analysis results of zircon U-Pb dating of mafic-ultramafic rock in Pingchuan region

分析点	含量(10^-6)		Th/U	U-Th-Pb同位素比值±1σ				同位素年龄±1σ(Ma)
分析点	U	Th	Th/U	²⁰⁷Pb/²⁰⁶Pb	²⁰⁷Pb/²³⁵U	²⁰⁶Pb/²³⁸U	²⁰⁸Pb/²³²Th	²⁰⁶Pb/²³⁸U	²⁰⁷Pb/²³⁵U	²⁰⁸Pb/²³²Th
DSS
01	764	946	1.24	0.051 4±0.001 5	0.291 3±0.008 6	0.041 0±0.000 4	0.011 3±0.000 2	258.91±2.50	259.55±6.76	227.08±3.46
02	649	1 076	1.66	0.054 2±0.001 7	0.307 8±0.009 3	0.041 1±0.000 4	0.011 1±0.000 2	259.84±2.41	272.44±7.26	222.77±4.09
03	623	856	1.37	0.050 9±0.001 6	0.288 8±0.008 9	0.041 0±0.000 4	0.011 3±0.000 2	259.25±2.45	257.59±7.02	227.56±4.45
04	470	862	1.83	0.053 7±0.001 8	0.305 4±0.010 4	0.041 1±0.000 4	0.011 7±0.000 2	259.58±2.53	270.64±8.09	234.66±4.63
05	563	783	1.39	0.052 1±0.001 7	0.295 1±0.009 5	0.041 0±0.000 4	0.011 5±0.000 2	259.30±2.71	262.58±7.49	230.70±4.29
06	421	525	1.25	0.050 6±0.001 9	0.285 7±0.010 6	0.041 1±0.000 4	0.011 3±0.000 2	259.69±2.77	255.15±8.40	226.73±4.99
07	746	1 300	1.74	0.054 6±0.001 6	0.310 8±0.008 6	0.041 2±0.000 4	0.011 5±0.000 2	260.31±2.35	274.79±6.66	231.97±4.81
08	387	418	1.08	0.051 2±0.001 9	0.291 0±0.010 8	0.041 1±0.000 4	0.011 6±0.000 3	259.90±2.63	259.38±8.46	232.48±5.54
09	340	484	1.43	0.049 4±0.002 2	0.279 9±0.012 5	0.041 1±0.000 4	0.011 4±0.000 3	259.38±2.76	250.60±9.88	229.50±5.60
10	152	119	0.78	0.053 6±0.002 8	0.302 6±0.016 0	0.041 1±0.000 6	0.010 9±0.000 4	259.63±3.93	268.45±9.49	218.88±8.29
11	632	607	0.96	0.050 1±0.001 6	0.283 8±0.008 8	0.041 1±0.000 4	0.011 3±0.000 3	259.84±2.38	253.70±6.99	227.63±5.18
12	523	641	1.23	0.049 9±0.001 7	0.281 1±0.009 1	0.040 9±0.000 4	0.011 5±0.000 2	258.56±2.70	251.56±7.22	230.56±4.80
13	673	1 067	1.59	0.052 8±0.001 6	0.298 1±0.009 0	0.041 0±0.000 5	0.011 5±0.000 2	258.88±2.93	264.89±7.06	230.30±4.89
14	274	291	1.06	0.052 0±0.002 5	0.292 4±0.014 2	0.041 0±0.000 5	0.011 2±0.000 3	258.82±3.35	260.47±8.17	224.68±5.59
15	559	749	1.34	0.048 7±0.001 6	0.278 4±0.009 4	0.041 2±0.000 4	0.011 5±0.000 3	260.55±2.76	249.41±7.50	230.14±5.31
16	389	553	1.42	0.051 4±0.001 7	0.293 2±0.010 3	0.041 1±0.000 4	0.011 4±0.000 3	259.73±2.72	261.07±8.05	229.73±5.06
17	694	1 253	1.81	0.051 0±0.001 6	0.291 2±0.008 8	0.041 2±0.000 4	0.011 7±0.000 2	260.52±2.27	259.47±6.92	235.95±4.30
18	505	795	1.57	0.052 9±0.001 7	0.299 1±0.009 3	0.041 1±0.000 5	0.010 9±0.000 2	259.39±3.27	265.68±7.27	219.70±4.12
19	303	422	1.39	0.047 7±0.002 0	0.272 5±0.011 5	0.041 2±0.000 4	0.012 2±0.000 3	260.10±2.75	244.65±9.15	244.29±5.59
20	502	612	1.22	0.051 9±0.001 8	0.293 4±0.009 6	0.041 2±0.000 5	0.011 3±0.000 2	260.24±3.29	261.21±7.50	226.39±4.69
21	1 189	1 355	1.14	0.050 5±0.001 2	0.300 1±0.007 8	0.042 7±0.000 4	0.011 8±0.000 2	269.82±2.27	266.47±6.06	236.15±4.33
22	254	367	1.44	0.104 0±0.003 6	0.612 5±0.021 2	0.042 7±0.000 5	0.014 6±0.000 3	269.26±3.05	485.11±9.35	293.61±5.54
23	2 869	2 369	0.83	0.051 4±0.001 0	0.305 0±0.006 5	0.042 7±0.000 4	0.011 8±0.000 2	269.73±2.74	270.30±5.03	237.35±4.38
24	2 382	4 269	1.79	0.050 6±0.001 1	0.299 9±0.006 9	0.042 7±0.000 4	0.011 9±0.000 2	269.80±2.63	266.32±5.40	239.70±4.77
25	634	1 049	1.66	0.064 6±0.002 0	0.382 9±0.011 9	0.042 8±0.000 5	0.012 1±0.000 2	270.47±3.06	329.17±8.77	243.22±4.77
KI-8
01	1 329	688	0.52	0.047 3±0.002 2	0.070 3±0.003 1	0.010 8±0.000 1	0.003 6±0.000 1	69.6±0.8	69.0±3.0	72.4±2.1
04	778	466	0.60	0.051 1±0.001 7	0.277 9±0.009 4	0.039 2±0.000 4	0.012 3±0.000 4	248.1±2.8	249.0±7.5	247.2±7.2
05	734	415	0.57	0.051 7±0.002 1	0.279 6±0.011 2	0.039 0±0.000 4	0.013 2±0.000 4	246.6±2.3	250.4±8.9	265.0±8.3
KI-18
01	1 568	1 202	0.77	0.083 1±0.003 2	0.115 3±0.004 4	0.010 0±0.000 1	0.003 6±0.000 1	64.3±0.8	110.8±4.0	73.0±2.2
03	308	664	2.16	0.099 0±0.004 0	0.531 6±0.021 3	0.039 2±0.000 6	0.007 2±0.000 3	248.1±3.8	264.0±7.0	221.0±6.6
04	366	185	0.50	0.058 9±0.001 9	0.632 7±0.019 0	0.078 0±0.000 9	0.022 4±0.000 6	484.0±5.6	497.8±11.8	446.9±12.2
05	203	208	1.02	0.073 1±0.002 7	0.784 2±0.031 2	0.078 1±0.001 1	0.023 6±0.000 8	484.5±6.7	587.9±17.7	471.3±15.4
06	374	119	0.32	0.060 2±0.001 8	0.657 2±0.020 2	0.078 7±0.000 9	0.023 2±0.000 7	488.3±5.4	512.9±12.4	463.0±13.7
07	253	235	0.93	0.098 6±0.002 4	3.599 6±0.089 7	0.263 3±0.003 5	0.064 1±0.001 4	15 06.5±17.7	1 549.4±19.8	1 255.0±26.8
08	161	146	0.90	0.095 3±0.002 5	3.643 7±0.093 5	0.276 4±0.003 2	0.074 6±0.001 8	1 573.0±16.3	1 559.1±20.4	1 454.9±33.1
09	258	262	1.02	0.099 9±0.002 1	3.831 7±0.088 4	0.277 7±0.004 0	0.064 7±0.001 4	1 579.6±20.4	1 599.4±18.6	1 266.7±26.4
注：分析测试工作在中国地质大学(武汉)地质过程与矿产资源国家重点实验室测定.

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表 4 平川地区大杉树辉长岩锆石稀土分析结果

Table 4. The analysis results of zircon REE of Dashanshu gabbro in Pingchuan region

分析点	元素(10^-6)														LREE/HREE	δEu	δCe
分析点	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	LREE/HREE	δEu	δCe
01	0.009 2	34.90	0.09	1.43	3.08	1.33	21.62	11.26	157.62	65.67	323.46	76.32	759.13	129.94	0.03	0.36	105.52
02	0.000 0	27.54	0.12	1.79	4.18	1.17	21.80	10.71	132.70	52.16	221.94	48.30	455.14	73.12	0.03	0.30	63.41
03	0.005 0	42.82	0.09	2.15	5.26	1.54	26.27	14.09	189.26	79.84	368.47	83.82	819.12	133.59	0.03	0.33	139.59
04	0.100 3	24.44	0.46	7.26	13.99	5.00	87.08	36.38	435.58	158.82	683.81	144.48	1364.94	215.60	0.02	0.33	13.94
05	0.016 3	44.48	0.16	2.60	5.73	1.48	31.42	15.81	209.74	82.38	379.41	83.80	804.10	131.03	0.03	0.27	78.12
06	0.000 0	27.92	0.09	1.38	3.92	1.17	19.61	10.12	143.30	58.62	287.90	67.06	681.36	115.61	0.02	0.33	93.24
07	0.097 8	34.97	0.53	8.07	18.09	5.36	90.56	39.55	470.83	173.93	750.13	165.51	1 557.64	249.51	0.02	0.33	17.65
08	0.063 5	29.49	0.21	2.91	5.90	1.51	32.22	15.35	194.75	79.12	358.21	80.99	790.04	124.81	0.02	0.27	36.52
09	0.000 0	18.84	0.19	4.44	9.89	2.20	45.90	19.90	228.14	84.08	360.77	77.76	733.30	113.78	0.02	0.26	28.47
10	0.013 9	12.31	0.05	0.86	2.71	0.55	13.32	6.72	84.84	34.95	164.51	38.34	386.28	66.08	0.02	0.23	61.98
11	0.052 9	29.64	0.05	1.83	3.60	1.19	20.14	10.66	149.18	61.29	290.88	66.07	661.86	107.02	0.03	0.34	115.23
12	0.046 4	42.45	0.16	2.23	6.73	1.48	35.03	16.54	223.37	90.59	414.22	92.97	895.55	142.99	0.03	0.24	67.51
13	0.054 5	40.63	0.39	6.42	13.35	3.60	69.48	29.53	361.78	129.67	557.11	118.41	1 072.94	168.56	0.03	0.29	28.14
14	0.014 5	15.82	0.10	1.79	3.05	1.00	17.67	7.92	107.12	44.55	210.12	49.19	484.44	85.38	0.02	0.33	43.36
15	0.046 0	22.48	0.36	6.88	12.12	2.68	58.28	25.39	294.42	108.22	460.19	99.14	930.72	142.63	0.02	0.25	17.16
16	0.000 0	20.36	0.18	4.79	7.25	2.41	38.89	17.20	210.42	77.92	350.77	78.58	767.70	122.09	0.02	0.35	32.20
17	0.133 3	42.41	0.52	9.42	24.11	6.30	120.51	49.27	575.26	204.58	850.92	180.25	1 654.82	245.62	0.02	0.29	21.38
18	0.019 2	22.06	0.37	4.91	11.44	2.60	59.31	28.29	350.92	132.60	577.49	122.86	1 134.99	178.77	0.02	0.25	16.59
19	0.019 4	15.38	0.29	4.77	8.52	2.14	46.19	20.50	245.44	89.35	382.46	83.29	778.75	120.58	0.02	0.26	14.58
20	0.039 6	20.02	0.21	4.04	7.42	1.87	40.21	16.97	217.08	86.48	384.21	84.26	799.30	132.11	0.02	0.26	24.97
21	0.013 6	3.41	0.07	1.42	3.46	1.57	15.93	7.80	99.53	41.14	197.15	49.38	549.88	100.54	0.01	0.54	12.28
22	0.047 7	14.43	0.19	3.55	9.10	2.67	45.89	19.72	229.23	84.99	363.72	78.35	727.83	117.92	0.02	0.32	19.89
23	0.025 4	19.92	0.12	1.84	4.83	1.77	26.31	12.18	163.87	67.30	321.23	76.78	812.31	146.50	0.02	0.38	42.60
24	0.041 0	50.80	0.17	1.13	3.75	1.78	25.77	13.19	182.01	77.44	386.06	94.43	988.67	172.94	0.03	0.41	77.19
25	0.014 9	42.62	0.19	2.95	4.95	1.26	28.76	13.72	161.79	63.03	283.36	61.02	580.10	92.22	0.04	0.25	62.42
注：分析测试工作在中国地质大学(武汉)地质过程与矿产资源国家重点实验室测定.

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