扬子北缘大洪山地区早古生代基性岩脉的厘定及其地质意义

陈超; 苑金玲; 孔令耀; 叶竹君; 杨青雄; 杨成; 周峰

doi:10.3799/dqkx.2018.577

扬子北缘大洪山地区早古生代基性岩脉的厘定及其地质意义

doi: 10.3799/dqkx.2018.577

1.
湖北省地质调查院, 湖北武汉 430034
2.
湖北省地质科学研究院, 湖北武汉 430034

基金项目:

中国地质调查局项目 121201009000160902

湖北省地质局科技项目 KJ2018-1

详细信息

作者简介:
陈超(1987-), 男, 硕士研究生, 工程师, 主要从事基础地质调查与研究工作

中图分类号: P581
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出版历程
- 收稿日期: 2018-03-31
- 刊出日期: 2018-07-15

Documentation of Early Paleozoic Mafic Dykes in the Dahongshan Region, Northern Yangze Block and Its Geological Significance

1.
Hubei Geological Survey, Wuhan 430034, China
2.
Hubei Institute of Geosciences, Wuhan 430034, China

摘要

摘要: 扬子北缘大洪山地区广泛出露北西-南东向基性岩脉，脉体主要侵位于区内前南华系基底砂板岩、白云岩中，而南华系及上覆盖层中少见.长期以来，这套基性侵入岩的形成时代和背景都存在疑问.通过对七里冲、姚家咀、姚家冲、刘关4个地区的基性岩脉进行锆石LA-ICP-MS U-Pb测年，获得成岩年龄分别为433.7 Ma、435.6 Ma、433.4 Ma、436.4 Ma，这些年龄值在误差范围内一致，同属于早志留世，为大洪山地区这期基性岩脉提供了精确的同位素年代学依据.地球化学方面，大洪山地区基性岩脉表现为亚碱性系列的特点，较高∑REE含量，轻、重稀土存在分异，富集LILEs而亏损HFSEs，Zr > 100×10^-6，TiO₂ > 2%，Zr/Y > 3.5，指示其形成于大陆伸展环境.首次在扬子地块北缘识别出一套早古生代晚期代表大陆伸展环境的基性岩脉，为扬子地块北缘大洪山地区存在早古生代近北东向的区域伸展提供强有力的证据.研究表明，早古生代秦岭-大别南缘和扬子地块北缘虽然在沉积上地层存在差异，但可能同属于扬子北缘陆缘裂谷拉张环境.
- 扬子北缘 /
- 基性岩脉 /
- 早古生代 /
- 锆石U-Pb测年 /
- 地球化学
Abstract: NE-SW mafic dykes are widespread in the Dahongshan region, northern Yangtze block. They mainly emplaced the pre-Nanhua basement rock, e.g. dolomite, sandstone and slate, and scarcely found in Nanhuan system and its overlying strata. It has been controversial for their formation age and background of the mafic dykes for a long time. In this paper, LA-ICP-MS zircon dating for 4 mafic dykes from Qilichong, Yaojiaju, Yaojiachong and Liuguan yield U-Pb ages of 433.7 Ma, 435.6 Ma, 433.4 Ma and 436.4 Ma respectively. All the ages belong to the Early Silurian and are consistent within measuring errors, and offer precise isotope chronology to the mafic dykes in the Dahongshan region. The mafic dykes in the Dahongshan region are characterized by subalkalic series, high ∑REE content, medium differentiation between LREE and HREE, enriched LILEs and depleted HFSEs, Zr > 100×10^-6, TiO₂ > 2%, and Zr/Y > 3.5. Accordingly, it is suggested that they may have formed in a continental extension environment. We have discerned Early Paleozoic mafic dykes swarm indicative of continental extension in the northern Yangtze block for the first time. It provides powerful evidence that the Dahongshan region in the northern Yangtze block shows NE regional extension. Additionally, we tentatively thought that the south Qinling-Dabie mountain and the north Yangtze block belong to same extensional epicontinental rift environment although different sedimentary strata appeared between them in Early Paleozoic.
- northern Yangze block /
- mafic dykes /
- Early Paleozoic /
- zircon U-Pb dating /
- geochemistry

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图 1 大洪山地区早古生代基性侵入岩地质背景简图

Fig. 1. Simplified geological map about Early Paleozoic mafic intrusions in the Dahongshan region

下载: 全尺寸图片幻灯片

图 2 大洪山地区基性岩脉野外产出特征(a~e)和产状赤平投影(f, g)

Fig. 2. Characteristics in field (a-e) and attitude stereograms (f, g) of the mafic dykes in the Dahongshan region

下载: 全尺寸图片幻灯片

图 3 基性岩脉镜下特征

a.七里冲辉绿岩(正交光)；b.晏家咀辉绿岩(正交光).Aug.普通辉石；Hb.角闪石；Mt.磁铁矿；Pl.斜长石；Qz.石英

Fig. 3. The characteristics of the mafic dykes under-microscope

下载: 全尺寸图片幻灯片

图 4 基性岩脉代表性锆石阴极发光图、LA-ICP-MS测点位置、编号及年龄值

白色标尺代表 50 μm

Fig. 4. Cathodoluminescence (CL) images, LA-ICP-MS analytical locations, serial numbers and their ages for representative zircon grains from the mafic dykes in the Dahongshan region

下载: 全尺寸图片幻灯片

图 5 基性岩脉LA-ICP-MS锆石U-Pb测年谐和年龄图和加权平均年龄

Fig. 5. Concordia plots of LA-ICP-MS zircon U-Pb dating and the mean ages for the mafic dykes

下载: 全尺寸图片幻灯片

图 6 大洪山地区基性岩脉分类图解

a.TAS图解，据Irvine and Baragar(1971)、Le Bas et al.(1986)；b.Nb/Y-Zr×10^-4/TiO₂，据Winchester and Floyd(1977)、Pearce(2014)；兰家畈玄武岩数据摘自董云鹏等(1998a)，下文一致

Fig. 6. Classification diagrams of the mafic dykes from the Dahongshan region

下载: 全尺寸图片幻灯片

图 7 基性岩脉球粒陨石标准化稀土元素配分图(a)和原始地幔标准化蛛网图(b)

据Sun and Mcdonough(1989)

Fig. 7. Chondrite-normalized REE distribution patterns (a) and primitive mantle-normalized spidergrams (b) for the mafic dykes

下载: 全尺寸图片幻灯片

图 8 大洪山地区基性岩脉构造环境判别图解

a.Zr-Zr/Y图解，据Pearce(1982)；b.Zr-TiO₂图解，据Pearce(1982)

Fig. 8. Discrimination diagrams for the mafic dykes from Dahongshan region

下载: 全尺寸图片幻灯片

表 1 大洪山地区典型基性岩脉特征统计

Table 1. Statistical table of the features for typical mafic dykes in the Dahongshan region

编号	地点	GPS	产状	描述(脉体和围岩特征)
北部
1	南风垭公路边	E112°59′25″ N31°28′47″	60°∠85°	辉绿岩脉宽约2.5 m，内部基本未发生变形，围岩为白云质、硅质砾岩，围岩发生一定蚀变，接触界面有错动，边部片理化强烈.
2	南坡公路边	E112°58′16″ N31°29′09″	98°∠44°	辉绿岩脉宽约1.5 m，内部基本未发生变形，围岩为白云岩，白云岩产状与接触界面近平行，围岩发生一定褐铁矿化，接触界面无错动.
3	南坡公路边	E112°58′12″ N31°29′08″	62°∠64°	辉绿岩脉宽约4 m，片理化强烈，片理产状90°∠48°，围岩为白云岩，白云岩层理产状345°∠70°，围岩发生一定蚀变，接触界面基本无错动，边部片理化强烈.
4	白龙池边	E112°57′40″ N31°28′59″	72°∠76°	辉绿岩脉宽1~3 m，基本未发生变形，围岩为泥质条带白云岩，产状5°∠66°，围岩发生一定蚀变，且岩脉中可见白云岩包体，脉体与围岩接触界面无错动.
5	白龙池边	E112°57′41″ N31°28′58″	67°∠24°	辉绿岩脉宽约0.5 m，围岩为白云岩，围岩发育宽约3 cm的蚀变带，脉体与围岩接触界面基本无错动，但都发生强烈片理化，片理产状123°∠45°.
6	白龙池边	E112°57′41″ N31°28′58″	76°∠42°	辉绿岩脉宽约2 m，围岩为白云岩，蚀变带发育，脉体与围岩接触界面基本无错动，但都发生强烈片理化.
7	白龙池边	E112°57′44″ N31°28′59″	61°∠44°	辉绿岩脉宽约3.5 m，围岩为白云岩，蚀变带发育，层理产状25°∠70°，脉体与围岩接触界面基本无错动，但都发生强烈片理化.
8	灵官垭	E112°56′43″ N31°29′08″	60°∠45°	辉绿岩脉宽约6 m，围岩为白云岩，蚀变带发育，层理产状0°∠84°，脉体与围岩接触界面基本无错动.
9	灵官垭	E112°58′11″ N31°29′12″	105°∠84°	辉绿岩脉宽约10 m，围岩为紫红色白云岩，层理产状155°∠66°，脉体与围岩之间略有错动.
10	七里冲	E112°58′12″ N31°29′13″	8°∠55°	辉绿岩脉宽约5 m，脉体破碎，围岩为粉砂岩，层理产状355°∠10°，脉体与围岩之间略有错动.
11	七里冲	E112°57′30″ N31°29′35″	25°∠74°	辉绿岩脉宽约2.5 m，脉体破碎，围岩为砂岩、粉砂岩，鲍马序列发育，脉体与围岩之间略有错动.
12	七里冲	E112°57′08″ N31°30′20″	73°∠86°	辉绿岩脉宽约6 m，围岩为中-细粒杂砂岩、白云质砂岩，层理产状70°∠54°，脉体与围岩之间基本无错动，围岩发育烘烤边，片理化强烈，片理产状50°∠70°.
南部
13	罗家咀	E113°05′15″ N31°22′01″	265°∠82°	辉绿岩脉宽约0.8 m，脉体片理化强烈，片理产状与脉体产状基本一致，围岩为白云岩，层理产状284°∠35°，脉体与围岩之间基本无错动.
14	罗家咀	E113°05′16″ N31°22′11″	67°∠72°	辉绿岩脉宽约4 m，脉体片理化强烈，片理产状25°∠70°，围岩为硅质条带白云岩，脉体与围岩之间基本无错动.
15	姚家冲	E113°06′28″ N31°23′16″	75°∠75°	辉绿岩脉宽2~4 m，脉体有一定片理化，围岩为刀砍纹白云岩，脉体与围岩之间基本无错动，蚀变带发育.
16	观音咀	E113°08′36″ N31°20′55″	64°∠80°	辉绿岩脉宽2~3 m，脉体发生劈理化，围岩为中-粗粒杂砂岩，脉体近直立，与围岩之间基本无错动.
17	罗汉岭	E113°07′03″ N31°19′37″	72°∠64°	辉绿岩脉宽约2 m，围岩为含硅质泥质板岩，板理产状：262°∠78°，脉体与围岩之间略有错动.
18	唐关	E113°07′02″ N31°30′21″	64°∠82°	辉绿岩脉宽约11 m，围岩为碎裂白云岩，刀砍纹发育，脉体与围岩呈切层关系，之间基本无错动.
19	仙人岭	E113°07′37″ N31°18′20″	76°∠74°	辉绿岩脉宽2~7 m不等，由下往上逐渐变窄，围岩为白云岩，切层明显，脉体与围岩接触部位发育红色褐铁矿化，白云岩围岩发育强烈大理岩化.
20	晏家咀	E113°09′43″ N31°14′16″	50°∠73°	辉绿岩脉宽约1.5 m，脉体破碎强烈，围岩为微晶白云岩，表明发育刀砍纹，二者之间有错动.
21	刘关	E113°09′29″ N31°14′11″	45°∠80°	辉绿岩脉宽约5 m，风化破碎严重，围岩为粉砂质板岩，片理产状32°∠50°，二者之间有错动.

下载: 导出CSV

表 2 基性岩脉锆石U-Pb测年结果

Table 2. U-Pb zircon data for the mafic dykes

分析点号	含量(10^-6)			Th/ U	比值						年龄(Ma)
分析点号	Pb	Th	U	Th/ U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁸Pb/²³²Th	1σ	²⁰⁶Pb/²³⁸U	1σ
D5076-1
01	37.46	160.0	482	0.33	0.064 5	0.002 0	0.588 7	0.017 7	0.065 9	0.000 6	767	60	470	11	412	4
02	28.56	123.0	359	0.34	0.061 9	0.001 8	0.586 1	0.016 5	0.068 4	0.000 6	672	61	468	11	427	4
03	33.29	239.0	430	0.56	0.067 9	0.003 6	0.569 1	0.021 4	0.061 8	0.001 0	865	109	457	14	386	6
04	39.50	229.0	508	0.45	0.059 9	0.001 9	0.541 4	0.016 2	0.065 7	0.000 8	600	101	439	11	410	5
05	29.54	203.0	355	0.57	0.055 6	0.001 8	0.535 5	0.017 3	0.069 7	0.000 8	435	72	435	11	435	5
06	31.28	141.0	394	0.36	0.055 5	0.001 7	0.538 7	0.017 2	0.070 0	0.000 9	435	69	438	11	436	5
07	35.86	165.0	458	0.36	0.055 5	0.001 7	0.534 8	0.016 6	0.069 7	0.000 8	432	69	435	11	434	5
08	53.40	258.0	654	0.39	0.057 6	0.001 5	0.558 8	0.014 0	0.070 2	0.000 7	522	56	451	9	437	4
09	31.60	225.0	372	0.60	0.057 3	0.001 7	0.548 0	0.016 2	0.069 5	0.000 7	502	67	444	11	433	4
10	33.42	242.0	393	0.62	0.059 4	0.001 7	0.569 9	0.016 1	0.069 6	0.000 7	583	68	458	10	434	4
11	35.94	121.0	397	0.30	0.057 4	0.001 5	0.682 5	0.021 3	0.086 3	0.001 5	506	53	528	13	534	9
12	34.89	146.0	429	0.34	0.056 6	0.001 7	0.570 6	0.018 1	0.073 5	0.001 1	476	65	458	12	457	7
13	99.70	289.0	1 288	0.22	0.057 5	0.001 3	0.553 4	0.013 2	0.069 6	0.000 6	522	50	447	9	434	4
14	15.87	87.5	190	0.46	0.060 9	0.002 2	0.584 9	0.021 3	0.070 4	0.001 0	635	78	468	14	438	6
15	50.75	203.0	645	0.31	0.054 3	0.001 2	0.526 5	0.012 6	0.070 1	0.000 7	383	52	430	8	437	4
16	42.82	92.4	552	0.17	0.058 9	0.001 4	0.570 5	0.014 3	0.070 0	0.000 8	565	54	458	9	436	5
17	42.05	155.0	534	0.29	0.054 0	0.001 5	0.521 1	0.014 1	0.069 8	0.000 8	372	63	426	9	435	5
18	33.49	151.0	409	0.37	0.061 6	0.001 9	0.594 5	0.018 0	0.069 8	0.000 8	661	66	474	11	435	5
19	35.77	137.0	453	0.30	0.056 3	0.001 7	0.538 5	0.016 6	0.068 7	0.000 8	465	67	437	11	428	5
20	45.08	203.0	563	0.36	0.057 4	0.001 6	0.544 5	0.015 1	0.068 7	0.000 7	506	63	441	10	428	4
21	32.41	134.0	421	0.32	0.068 3	0.002 1	0.617 4	0.019 8	0.065 0	0.000 7	880	64	488	12	406	4
22	36.90	166.0	450	0.37	0.056 2	0.001 5	0.543 3	0.013 9	0.070 1	0.000 7	461	27	441	9	437	4
23	46.14	215.0	639	0.34	0.063 1	0.003 4	0.512 4	0.015 1	0.061 1	0.000 9	722	121	420	10	382	5
24	35.65	113.0	343	0.33	0.069 1	0.002 2	0.820 3	0.028 8	0.085 1	0.001 2	902	65	608	16	526	7
PM07-26-1
01	32.98	144.0	400	0.36	0.057 0	0.001 7	0.550 4	0.016 6	0.070 2	0.000 9	494	67	445	11	437	6
02	37.23	152.0	454	0.34	0.056 4	0.001 5	0.549 9	0.015 9	0.070 1	0.000 8	478	59	445	10	437	5
03	76.00	245.0	929	0.26	0.054 5	0.001 1	0.531 4	0.011 6	0.070 6	0.001 0	394	44	433	8	440	6
04	45.29	168.0	557	0.30	0.054 7	0.001 4	0.528 2	0.014 0	0.070 0	0.000 9	467	57	431	9	436	5
05	27.64	118.0	323	0.36	0.054 7	0.001 7	0.525 2	0.016 5	0.069 6	0.000 7	467	75	429	11	434	4
06	35.82	105.0	416	0.25	0.054 1	0.001 7	0.540 1	0.017 0	0.072 6	0.001 1	376	69	438	11	452	7
07	30.50	203.0	336	0.60	0.054 7	0.002 1	0.515 9	0.019 6	0.068 9	0.000 9	398	87	422	13	429	5
08	41.65	221.0	459	0.48	0.057 7	0.002 1	0.561 4	0.024 4	0.069 6	0.000 9	517	81	452	16	434	6
09	45.60	324.0	463	0.70	0.058 2	0.001 8	0.566 9	0.017 7	0.070 3	0.000 8	539	64	456	11	438	5
10	49.92	197.0	569	0.35	0.055 5	0.001 3	0.541 8	0.014 3	0.070 0	0.000 8	432	54	440	9	436	5
11	24.86	76.8	254	0.30	0.061 7	0.002 2	0.692 0	0.027 3	0.080 1	0.001 1	665	78	534	16	497	6
12	100.70	253.0	1 243	0.20	0.056 2	0.001 5	0.535 2	0.014 6	0.068 4	0.000 7	461	61	435	10	426	4
13	33.80	115.0	299	0.38	0.065 8	0.002 0	0.833 1	0.027 9	0.090 4	0.001 4	1 200	60	615	15	558	8
14	18.98	93.9	215	0.44	0.062 1	0.002 4	0.595 3	0.020 3	0.070 2	0.001 1	676	81	474	13	437	7
15	42.25	73.3	228	0.32	0.087 6	0.002 3	1.818 4	0.045 7	0.149 9	0.001 7	1 374	55	1 052	16	900	10
16	129.00	178.0	332	0.54	0.107 2	0.001 9	4.454 6	0.080 3	0.298 3	0.002 7	1 754	32	1 723	15	1 683	13
17	36.70	221.0	417	0.53	0.059 6	0.001 6	0.582 8	0.015 8	0.070 2	0.000 7	587	56	466	10	438	4
18	36.94	140.0	447	0.31	0.059 0	0.001 6	0.574 9	0.015 9	0.070 4	0.000 9	565	61	461	10	438	5
19	47.20	168.0	551	0.30	0.057 8	0.001 6	0.585 3	0.015 4	0.073 1	0.000 9	520	64	468	10	455	5
20	24.08	143.0	265	0.54	0.057 2	0.001 9	0.595 1	0.020 9	0.075 1	0.001 2	498	69	474	13	467	7
21	32.85	152.0	384	0.39	0.059 0	0.001 8	0.575 0	0.017 2	0.070 5	0.001 0	565	67	461	11	439	6
22	45.42	180.0	548	0.33	0.058 1	0.001 4	0.564 3	0.014 0	0.069 9	0.000 7	532	54	454	9	435	4
23	55.60	340.0	641	0.53	0.058 1	0.001 4	0.568 7	0.013 8	0.070 4	0.000 7	600	52	457	9	438	4
24	36.64	146.0	442	0.33	0.057 1	0.001 4	0.557 1	0.013 9	0.070 2	0.000 8	494	54	450	9	438	5
D5021-5
01	99.0	583	475	1.23	0.058 3	0.002 1	0.441 1	0.012 8	0.054 9	0.000 6	543	75.9	371	9.0	345	3.5
02	41.0	179	115	1.55	0.086 5	0.003 6	0.841 1	0.035 8	0.070 4	0.001 0	1 350	75.0	620	19.8	439	6.2
03	21.4	49	245	0.20	0.055 4	0.002 1	0.518 8	0.018 3	0.068 2	0.000 9	428	91.7	424	12.3	425	5.2
04	278.0	135	316	0.43	0.143 6	0.002 2	10.117 2	0.181 3	0.507 9	0.006 2	2 272	21.3	2 446	16.6	2 648	26.5
05	38.0	111	361	0.31	0.058 2	0.001 9	0.570 9	0.017 6	0.070 5	0.001 0	600	74.1	459	11.4	439	6.0
06	40.0	105	435	0.24	0.055 6	0.001 4	0.530 3	0.014 2	0.068 9	0.000 7	435	52.8	432	9.4	430	4.5
07	22.0	320	597	0.54	0.051 8	0.001 8	0.127 6	0.004 6	0.017 9	0.000 3	276	79.6	122	4.1	114	1.8
08	25.6	228	232	0.98	0.055 5	0.002 2	0.276 6	0.010 5	0.036 4	0.000 5	432	87.0	248	8.3	230	3.0
09	15.7	286	361	0.79	0.051 0	0.002 4	0.113 7	0.005 3	0.016 3	0.000 2	243	111.1	109	4.8	105	1.4
10	168.0	610	809	0.75	0.070 1	0.001 3	0.825 4	0.015 2	0.085 4	0.000 9	931	34.3	611	8.4	528	5.5
11	310.0	300	414	0.73	0.117 9	0.002 2	4.931 6	0.102 8	0.301 4	0.003 6	1 924	33.3	1 808	17.6	1 698	18.0
12	51.0	215	310	0.69	0.059 2	0.002 6	0.554 1	0.020 3	0.068 9	0.001 3	576	93.4	448	13.3	430	8.1
13	14.8	122	353	0.34	0.051 4	0.002 2	0.184 5	0.007 9	0.025 9	0.000 3	257	100.0	172	6.7	165	2.1
14	20.1	67	163	0.41	0.063 8	0.002 3	0.627 1	0.024 3	0.070 6	0.000 8	744	77.8	494	15.2	440	4.9
15	22.2	124	206	0.60	0.059 5	0.002 2	0.383 7	0.013 9	0.046 9	0.000 6	583	79.6	330	10.2	295	3.7
16	53.0	43	39	1.10	0.158 6	0.003 5	8.850 5	0.224 9	0.402 8	0.006 3	2 440	38.7	2 323	23.2	2 182	28.9
17	227.0	2 042	1 844	1.11	0.056 0	0.001 2	0.285 7	0.006 3	0.036 7	0.000 4	454	46.3	255	5.0	233	2.2
18	35.5	53	338	0.16	0.073 0	0.002 4	0.709 2	0.025 6	0.069 6	0.000 9	1 013	66.7	544	15.2	434	5.5
19	30.1	60	97	0.62	0.068 8	0.002 2	1.322 8	0.043 2	0.139 8	0.002 1	892	66.7	856	18.9	844	11.8
20	26.7	62	338	0.18	0.054 0	0.001 4	0.523 3	0.013 9	0.069 9	0.000 7	372	54.6	427	9.2	436	4.3
21	113.0	1 191	2 069	0.58	0.055 1	0.001 6	0.203 7	0.004 6	0.027 1	0.000 5	413	64.8	188	3.9	172	3.0
22	29.0	404	350	1.15	0.051 6	0.002 3	0.153 7	0.007 0	0.022 1	0.000 5	333	102	145	6.2	141	2.9
23	236.0	663	1 759	0.38	0.057 0	0.000 9	0.659 4	0.012 0	0.083 4	0.001 0	494	35.2	514	7.3	517	6.2
24	122.0	86	90	0.95	0.155 0	0.002 9	9.419 8	0.217 1	0.436 9	0.006 8	2 402	32.9	2 380	21.2	2 337	30.3
D5024-5
01	78.0	191	554	0.35	0.063 6	0.001 4	0.721 3	0.021 8	0.081 7	0.001 8	728	46.3	551	12.9	506	11.0
02	42.0	156	242	0.65	0.052 0	0.002 1	0.520 6	0.019 5	0.070 6	0.001 0	287	92.6	426	13.0	440	6.2
03	65.0	319	258	1.24	0.055 0	0.001 5	0.531 0	0.015 1	0.069 8	0.000 7	413	61.1	432	10.0	435	4.2
04	109.0	381	684	0.56	0.056 0	0.001 2	0.588 0	0.014 4	0.076 2	0.000 9	454	17.6	470	9.2	473	5.2
05	119.0	538	570	0.94	0.053 7	0.001 3	0.524 0	0.015 0	0.070 5	0.000 6	361	55.6	428	10.0	439	3.5
06	75.0	336	349	0.96	0.057 7	0.001 6	0.556 5	0.017 8	0.070 3	0.000 8	520	67.6	449	11.6	438	4.8
07	214.0	647	1 937	0.33	0.060 9	0.001 3	0.546 1	0.015 0	0.064 9	0.000 6	635	48.1	442	9.9	406	3.6
08	163.0	736	999	0.74	0.061 7	0.001 7	0.571 5	0.017 3	0.067 7	0.000 8	665	57.4	459	11.2	422	5.0
09	309.0	101	439	0.23	0.163 3	0.002 5	10.586 1	0.210 8	0.468 3	0.004 5	2 490	25.8	2 487	18.6	2 476	19.7
10	109.0	372	643	0.58	0.061 7	0.001 2	0.599 2	0.013 3	0.070 3	0.000 8	665	43.4	477	8.4	438	4.7
11	289.0	158	235	0.67	0.162 3	0.002 3	10.902 7	0.178 3	0.484 2	0.004 9	2 480	24.1	2 515	15.3	2 546	21.2
12	213.0	140	221	0.63	0.156 7	0.002 7	8.592 5	0.186 9	0.393 8	0.005 8	2 420	29.8	2 296	19.8	2 141	26.9
13	53.0	192	267	0.72	0.087 1	0.002 2	1.080 2	0.039 7	0.088 5	0.002 2	1 365	48.5	744	19.4	547	12.8
14	213.0	402	502	0.80	0.074 6	0.001 6	1.743 1	0.030 5	0.169 4	0.001 7	1 057	42.6	1 025	11.3	1 009	9.2
15	112.0	215	448	0.48	0.070 8	0.001 5	1.255 5	0.025 6	0.127 8	0.001 0	954	42.6	826	11.6	776	5.8
16	142.0	337	635	0.53	0.062 7	0.001 2	0.763 0	0.018 0	0.087 5	0.001 2	698	43.5	576	10.4	541	7.4
17	39.0	45	101	0.44	0.084 2	0.002 0	2.460 3	0.060 6	0.211 4	0.002 5	1 298	45.8	1 260	17.8	1 236	13.3
18	71.0	277	399	0.69	0.058 4	0.001 9	0.584 9	0.030 4	0.070 4	0.001 1	543	70.4	468	19.4	439	6.7
19	70.0	170	158	1.08	0.063 5	0.001 7	1.177 8	0.030 8	0.135 0	0.001 7	724	61.3	790	14.4	816	9.6
20	23.7	98	144	0.68	0.051 5	0.001 9	0.494 3	0.018 6	0.069 6	0.000 8	265	85.2	408	12.6	434	4.9
21	44.0	157	231	0.68	0.052 7	0.002 4	0.548 9	0.017 8	0.069 7	0.001 3	322	105.5	444	11.7	434	7.6
22	63.0	192	345	0.56	0.060 2	0.001 4	0.676 5	0.016 0	0.082 0	0.001 3	613	50.0	525	9.7	508	8.0
23	50.0	385	704	0.55	0.051 9	0.001 4	0.238 6	0.006 5	0.033 3	0.000 4	280	61.1	217	5.4	211	2.4
24	70.0	290	473	0.61	0.054 1	0.001 5	0.519 0	0.012 9	0.069 3	0.000 7	376	56.5	425	8.6	432	4.0

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表 3 大洪山地区基性岩脉主量、微量元素数据

Table 3. Data of major and trace elements of the mafic dykes in the Dahongshan region

编号	D4013-2	D4021-4	D4024-1	D5017-4	D5017-9	D5019-2	D5020-2	D5072-1	D5073-1	D5074-1	D5076-1
主量元素(%)
SiO₂	48.76	53.29	47.57	56.84	49.94	50.61	49.27	45.05	48.04	52.31	47.94
TiO₂	2.35	2.03	2.90	3.70	2.28	2.71	2.80	2.59	2.84	2.15	1.44
Al₂O₃	12.32	12.26	12.06	13.97	18.34	14.04	19.85	12.74	18.64	12.24	15.79
Fe₂O₃	2.76	3.79	10.02	10.19	2.27	6.99	3.69	5.62	2.24	3.15	3.25
FeO	10.6	7.25	6.9	2.92	9.13	7.95	10.88	7.65	7.55	9.05	7.70
MnO	0.24	0.12	0.25	0.01	0.11	0.17	0.10	0.09	0.01	0.15	0.22
MgO	5.71	4.01	5.46	5.02	7.81	4.11	4.76	6.46	4.63	5.26	6.91
CaO	9.83	4.83	4.42	1.37	4.41	7.87	2.80	6.10	1.79	4.39	7.53
Na₂O	2.50	0.65	3.50	0.80	4.00	3.33	3.49	0.12	0.12	3.15	2.21
K₂O	0.36	3.79	0.23	4.33	1.32	1.71	1.86	3.73	7.80	0.28	2.94
P₂O₅	0.22	0.45	0.48	0.85	0.38	0.50	0.49	0.50	1.19	0.92	0.14
LOI	2.97	6.57	5.26	3.73	6.83	7.18	5.41	8.34	4.02	5.81	2.78
FeO^T	13.09	10.66	15.91	12.09	11.17	14.24	14.21	12.71	9.56	11.88	10.63
Na₂O+K₂O	0.57	4.24	0.70	5.18	1.70	2.22	2.35	4.23	8.99	1.20	3.08
Mg^#	43.75	40.14	37.94	42.52	55.49	33.94	37.42	47.52	46.31	44.10	53.69
微量元素(10^-6)
Sc	42.80	24.34	38.08	39.33	40.54	33.88	44.54	33.72	28.88	25.86	40.06
Cr	59.81	9.85	31.56	26.24	219.6	27.80	215.9	41.77	15.17	4.35	215.6
Co	42.93	20.26	38.79	58.40	65.35	41.77	71.79	28.94	44.08	11.01	43.83
Ni	34.67	9.92	15.83	45.98	77.39	15.90	61.79	18.88	42.27	1.43	49.90
Rb	11.29	65.89	7.13	69.15	17.90	22.14	19.04	84.35	61.40	2.44	71.09
Sr	159.8	58.69	120.8	25.42	107.3	194.3	56.95	81.59	20.29	86.52	266.0
Y	47.55	63.27	49.23	45.50	31.10	38.42	41.16	42.28	77.29	70.43	32.19
Nb	4.77	8.69	4.58	6.48	5.20	5.96	5.54	6.65	8.21	9.68	2.84
Zr	169.9	378.0	196.2	227.3	140.8	186.9	169.7	205.5	401.5	432.5	93.40
Ba	347.8	136.0	481.5	176.2	563.2	272.2	150.5	134.9	1463	221.2	1084
Th	1.31	3.36	0.75	1.12	0.59	2.43	0.83	1.38	2.87	2.24	0.51
U	0.27	0.76	0.20	0.52	0.73	0.60	0.48	0.32	1.17	0.51	0.16
La	12.20	34.88	24.53	17.42	15.24	22.36	15.49	20.72	35.45	46.54	5.18
Ce	27.91	76.26	51.01	39.13	33.09	49.52	36.59	46.80	96.03	107.2	13.39
Nd	20.47	45.58	34.57	32.10	23.47	29.82	24.43	30.31	66.15	69.85	12.09
Sm	6.04	11.06	8.76	8.71	5.88	7.21	6.54	7.68	15.78	16.69	3.83
Tb	1.41	2.01	1.65	1.51	1.02	1.20	1.27	1.33	2.42	2.41	0.85
Hf	5.8	8.6	6.0	4.45	3.56	4.36	3.74	4.01	7.12	10.24	2.14
Ta	0.54	0.63	0.41	0.50	0.47	0.49	0.52	0.59	0.42	0.56	0.31
Pb	1.64	6.34	7.15	4.10	3.83	7.00	6.67	6.33	5.56	2.17	2.09
V	444.2	290.0	513.8	438.2	352.8	397.1	404.2	402.8	221.6	88.91	275.6
La	12.20	34.88	24.53	17.42	15.24	22.36	15.49	20.72	35.45	46.54	5.18
Ce	27.91	76.26	51.01	39.13	33.09	49.52	36.59	46.80	96.03	107.2	13.39
Pr	4.28	10.68	7.79	6.65	5.12	6.86	5.43	6.87	14.79	15.60	2.39
Nd	20.47	45.58	34.57	32.10	23.47	29.82	24.43	30.31	66.15	69.85	12.09
Sm	6.04	11.06	8.76	8.71	5.88	7.21	6.54	7.68	15.78	16.69	3.83
Eu	2.00	2.78	2.56	2.42	1.75	1.99	1.95	2.07	3.96	5.01	1.42
Gd	7.00	10.90	8.95	9.79	6.36	7.56	7.72	8.35	15.94	16.14	4.93
Tb	1.41	2.01	1.65	1.51	1.02	1.20	1.27	1.33	2.42	2.41	0.85
Dy	8.71	11.94	9.68	8.81	6.27	7.52	7.84	8.52	14.53	14.11	5.73
Ho	1.77	2.37	1.89	1.67	1.19	1.43	1.52	1.65	2.88	2.64	1.16
Er	5.05	6.58	5.10	4.35	3.10	4.10	4.31	4.41	7.94	7.50	3.44
Tm	0.78	1.03	0.80	0.55	0.40	0.58	0.59	0.60	1.12	1.05	0.48
Yb	4.92	6.82	4.76	3.28	2.28	3.38	3.59	3.59	6.45	6.30	2.83
Lu	0.68	0.89	0.62	0.44	0.34	0.51	0.54	0.51	0.98	0.97	0.42
Zr/Y	3.57	5.97	3.99	5.00	4.53	4.86	4.12	4.86	5.19	6.14	2.90
∑REE	103.21	223.78	162.67	136.83	105.51	144.02	117.80	143.40	284.41	312.00	58.14
LREE/HREE	2.40	4.26	3.86	3.50	4.04	4.48	3.30	3.95	4.44	5.10	1.93
(La/Yb)_N	1.78	3.67	3.69	3.81	4.79	4.75	3.09	4.14	3.94	5.30	1.31
δEu	0.87	0.71	0.81	0.75	0.81	0.76	0.78	0.73	0.70	0.85	0.93
δCe	0.94	0.96	0.90	0.89	0.91	0.97	0.98	0.96	1.03	0.97	0.93
注：主量元素数据已经换算成干体系，FeO^T=FeO+0.899 8×Fe₂O₃，Mg^#=(MgO/40.31)×100/(MgO/40.31+FeO^T/71.85).

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