桂西南凭祥火山岩年代学、地球化学及Hf同位素研究——对古特提斯洋最晚北向俯冲事件的启示

李政林; 刘希军; 肖文交; 鲍厚银; 时毓; 刘磊; 廖帅; 覃显著

doi:10.12090/j.issn.1006-6616.2019.25.05.076

桂西南凭祥火山岩年代学、地球化学及Hf同位素研究——对古特提斯洋最晚北向俯冲事件的启示

doi: 10.12090/j.issn.1006-6616.2019.25.05.076

李政林^1,,
刘希军^{1, 2, ,},
肖文交²,
鲍厚银¹,
时毓¹,
刘磊¹,
廖帅¹,
覃显著¹

1.
桂林理工大学广西隐伏金属矿产勘查重点实验室, 广西桂林 541004
2.
中国科学院新疆生态与地理研究所新疆矿产资源研究中心, 新疆乌鲁木齐 830011

基金项目:

国家自然科学基金 41888101

国家自然科学基金 41562005

国家自然科学基金 41772059

广西自然科学基金杰出青年科学基金 2018GXNSFFA281009

广西八桂学者项目 2018

广西八桂学者项目有色金属成矿理论与勘查技术

广西中青年教师基础能力提升项目 2019KY0272

详细信息

作者简介:
李政林(1989-), 男, 硕士, 助理研究员, 主要从事岩石地球化学研究。E-mail:lizhenglin@glut.edu.cn

通讯作者:
刘希军(1980-), 男, 博士, 教授, 主要从事岩石地球化学研究。E-mail:xijunliu@glut.edu.cn

中图分类号: P588.14;P597.3
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出版历程
- 收稿日期: 2019-08-20
- 修回日期: 2019-10-01
- 刊出日期: 2019-10-28

GEOCHRONOLOGY, GEOCHEMISTRY AND HF ISOTOPES OF VOLCANIC ROCKS IN PINGXIANG AREA, SOUTHWEST GUANGXI: IMPLICATIONS FOR THE LATEST STAGE OF PALEO-TETHYAN OCEAN NORTHWARD SUBDUCTION

1.
Guangxi Hidden Mineral Exploration Center, College of Earth Sciences, Guilin University of Technology, Guilin 541004, Guangxi, China
2.
Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China

摘要

摘要: 华南西南缘凭祥地区位于特提斯构造域东端，华南与印支陆块碰撞缝合带的北部，该区出露的三叠纪中酸性火山岩是古特提斯洋俯冲过程中在华南陆块边缘形成的大陆弧产物，这些火山岩同时携带的大量来自华南陆块基底的捕获锆石为华南陆块的构造热事件研究将提供重要的信息。对凭祥地区三叠系北泗组英安岩进行了同位素年代学、地球化学及锆石Hf同位素研究，获得了一个英安岩样品的加权平均年龄为（227.8±1）Ma，这些英安岩具有高SiO₂、K₂O含量，极低的MgO、MnO和CaO含量，富集大离子亲石元素（Rb、Ba、Th和U）和亏损高场强元素（Nb、Ta）的特点，显示了典型的岛弧岩浆作用特征，代表古特提斯洋向北俯冲至华南陆块之下形成的大陆弧产物。其余两个英安岩样品中的70粒锆石主要为来自华南陆块基底的捕获锆石，其年龄数据变化区间较大，为1010~231 Ma，这些捕获锆石U-Pb年龄频谱分布主要集中在四个区间：11010~800 Ma（峰值900 Ma），其锆石的ε_Hf（t）值为4.5~15.1，响应扬子和华夏陆块之间聚合-裂解-再聚合的构造演化事件，反应了其幔源岩浆的广泛参与；2720~620 Ma（峰值680 Ma）响应南华纪已拼合的扬子-华夏陆块的再次发生裂解；3490~400 Ma（峰值450 Ma），其锆石的ε_Hf（t）值为2.2~-7.8，响应华南早古生代加里东运动有关的壳-幔相互作用岩浆事件；4280~230 Ma（峰值250 Ma），其锆石ε_Hf（t）值为-13.6~-16.5，地壳模式年龄为2.3~2.1 Ga，代表了印支与华南陆块之间古特提斯洋俯冲闭合的岩浆事件。文章的研究结果揭示了凭祥北泗组英安岩与华南陆块的亲缘性，其结晶年龄限定了华南与印支陆块之间的古特提斯洋俯冲结束、陆-陆开始碰撞的最晚时限为中-晚三叠纪。
- 华南西南缘 /
- 火山岩 /
- 大陆弧 /
- 古特提斯洋
Abstract: Pingxiang area located in the southwest margin of Souch China Block (SCB) and north side of the collision zone between the South China and Indochina plate, tectonically belongs to the eastern part of the Tethyan tectonic domain. The Triassic intermediate-acid volcanics exposed in the Pingxiang area are continental arcs formed during the subduction of the Paleo-Tethysan ocean. They carried a large number of captured zircons sourced from the basement of SCB, which provided important information for the tectono-thermal events in SCB. In this paper, the geochronology, geochemistry and zircon Hf isotope studies were carried out on the dacites from Triassic Beisi Formation in Pingxiang area, and a weighted average age yeild 227.8±1.3 Ma from one dacite sample was obtained, representing its crystallization age. Geochemically, the dacites have high contents of SiO₂, K₂O, and low MgO, MnO and CaO contents, enriched in LILEs (Rb, Ba, Th and U) and depleted in HFSEs (Nb, Ta), which shows a typical characteristics of island arc magma, representing the continental arc products formed by the northward subduction of the Paleo-Tethysan ocean. The U-Pb age frequency distribution of captured zircons from another two dacite samples is mainly concentrated in (1)1010~800 Ma (peak 900 Ma), and the zircon ε_Hf(t) value is 4.5~15.1, responding to the tectonic evolution events of the convergence-rifting-reconvergence between the Yangtze and Cathaysia blocks and the participation of the mantle-derived magma; (2) 720~620 Ma (peak 680 Ma), responding to the re-rifting of the Yangtze-Cathaysia blocks; (3) 490~400 Ma (peak 450 Ma), the zircon ε_Hf(t) value is 2.2~-7.8, responding to the tectono-magmatic event of crust-mantle interaction related to the Caledonian movement in Early Paleozoic in SCB; (4) 280~230 Ma (peak 250 Ma), the zircon ε_Hf(t) value is -13.6~-16.5, and the crustal model age is 2.3~2.1 Ga, which represents the magmatic event of the Paleo-Tethysan Ocean final subduction to closure between Indochina and South China. The study results reveal the dacites from Beisi formation have an intimate affinity with SCB, and its crystallization age constrains the latest time of the Paleo-Tethysan Ocean subduction ending to closure between SCB and Indochina block at least last to Middle to Late Triassic.
- southwest margin of South China /
- volcanic rocks /
- continental arc /
- Paleo-Tethysan Ocean
注释:

责任编辑：范二平

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图 1 华南西南缘地质简图(修改自Cai等^[8])

Figure 1. Simplified geological map of the southwest margin of South China (modified after reference[8])

下载: 全尺寸图片幻灯片

图 2 右江盆地西南缘地质简图(修改自覃小锋等^[17])

Figure 2. Simplified geological map of the southwest margin of the Youjiang basin(modified after reference[17])

下载: 全尺寸图片幻灯片

图 3 凭祥火山岩部分锆石CL图

Figure 3. CL images of some volcanic zircons in Pingxiang

下载: 全尺寸图片幻灯片

图 4 凭祥火山岩中锆石的U-Pb谐和图和²⁰⁶U/²³⁸Pb模式年龄分布图

Figure 4. U-Pb concordia diagram and frequency of ²⁰⁶U/²³⁸Pb model age diagram of volcanic zircons in Pingxiang

下载: 全尺寸图片幻灯片

图 5 凭祥火山岩(Zr/Ti₂O×10^-4)-SiO₂^[25]和SiO₂-K₂O^[26]图解

Figure 5. Plots of Zr/Ti₂O×10^-4 vs.SiO₂^[25]and SiO₂ vs. K₂O^[26] of volcanic rocks in Pingxiang

下载: 全尺寸图片幻灯片

图 6 凭祥火山岩REE球类陨石标准化和不相容元素原始地幔标准化图^[27]

(球粒陨石、原始地幔、E-MORB和OIB值据McDonough and Sun^[28])

Figure 6. Chondrite-normalized REE patterns and primitive mantle-normalized trace element patterns of volcanic rocks in Pingxiang^[27]

(chondrite, primitive mantle, E-MORB and OIB values from reference[28])

下载: 全尺寸图片幻灯片

图 7 凭祥火山岩中ε_Hf(t)—年龄投影图

Figure 7. Plot of ε_Hf(t) vs.age of zircons from volcanic rocks in Pingxiang

下载: 全尺寸图片幻灯片

图 8 凭祥火山岩Y-Nb^[31]和Y+Nb-Rb^[31]相关图解

WPG-板内花岗岩；VAG-火花弧花岗岩；synCOLG-同碰撞花岗岩；ORG-大洋中脊花岗岩

Figure 8. Plots of Y vs.Nb^[31] and Y+Nb vs.Rb^[31] of volcanic rocks in Pingxiang

下载: 全尺寸图片幻灯片

表 1 凭祥英安90岩主量元素(%)和微量元素(×10^-6)含量表

Table 1. Major (%) and rare (×10^-6) elements content of dacites in Pingxiang

样号	PX-01	PX-02	PX-03	PX-04	PX-05	PX-06
主量元素
SiO₂	71.77	71.01	69.79	69.12	71.09	70.85
TiO₂	0.40	0.37	0.38	0.38	0.39	0.38
Al₂O₃	14.33	13.60	13.65	13.58	13.43	13.72
Fe₂O₃	2.39	2.58	1.78	2.66	2.48	2.57
MnO	0.03	0.01	0.02	0.01	0.02	0.02
MgO	0.74	0.33	0.60	0.35	0.75	0.75
CaO	1.77	1.31	3.04	2.45	1.34	1.41
Na₂O	2.35	2.33	2.30	2.14	2.38	2.21
K₂O	4.71	5.18	4.59	4.89	4.64	4.68
P₂O₅	0.14	0.13	0.13	0.13	0.14	0.14
LOI	0.87	2.67	3.17	3.29	4.33	4.25
Total	99.49	99.51	99.44	99.00	100.98	100.98
微量元素
V	24.22	22.17	25.78	25.42	24.67	24.20
Cr	13.39	12.19	14.16	12.78	14.19	12.88
Co	4.02	4.22	3.81	4.45	3.95	3.73
Ni	6.07	6.33	6.02	6.98	7.26	5.37
Cu	6.21	5.93	6.95	7.45	6.34	5.88
Zn	41.00	38.51	51.76	43.44	42.49	44.40
Ga	17.05	19.09	20.82	21.40	17.02	16.47
Rb	174.4	191.9	146.3	165.2	201.8	205.9
Ba	758.6	816.1	900.5	935.9	780.6	753.3
Th	8.68	8.59	8.70	8.78	9.06	8.99
U	2.18	2.18	2.18	2.19	2.18	2.18
Nb	11.38	10.75	10.69	11.02	11.54	11.25
Ta	1.02	0.99	0.96	0.99	1.03	1.02
La	39.75	33.45	38.52	37.06	39.25	41.41
Ce	87.0	73.1	84.6	81.3	85.3	88.9
Pb	25.56	24.19	20.52	26.85	28.34	29.11
Pr	9.83	8.25	9.28	9.09	9.61	9.95
Sr	100.2	151.2	123.5	127.8	103.6	96.0
Nd	34.91	29.58	33.05	32.37	34.26	35.53
Zr	392.9	389.3	388.5	382.2	331.0	335.7
Hf	9.70	9.40	9.27	9.21	8.79	8.85
Sm	7.09	6.07	6.69	6.62	7.06	7.20
Eu	1.09	0.95	1.07	1.13	1.02	1.08
Gd	4.69	4.43	4.64	4.58	4.67	4.72
Tb	1.04	0.92	1.00	1.00	1.05	1.03
Dy	6.02	5.43	5.72	5.87	6.11	6.21
Y	33.66	31.00	32.91	32.78	34.06	34.54
Ho	1.33	1.24	1.26	1.30	1.35	1.37
Er	3.20	3.05	3.07	3.20	3.27	3.25
Tm	0.50	0.48	0.48	0.50	0.52	0.52
Yb	3.03	2.85	2.95	2.96	3.07	3.08
Lu	0.48	0.45	0.46	0.46	0.47	0.48
Eu^*	0.19	0.18	0.19	0.20	0.18	0.19
(La/Yb)_N	9.40	8.43	9.37	8.97	9.17	9.63

下载: 导出CSV

表 2 凭祥英安岩锆石LA-ICP-MS U-Pb年代学数据表

Table 2. LA-ICP-MS zircon analytical data of dacite in Pinxiang

样号	Th/×10^-6	U/×10^-6	Th/U	²⁰⁷Pb/²⁰⁶Pb			²⁰⁷Pb/²³⁵U			²⁰⁶Pb/²³⁸U			²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
样号	Th/×10^-6	U/×10^-6	Th/U	Ratio	σ		Ratio	σ		Ratio	σ		Age/Ma	σ_e/Ma	Age/Ma	σ_e/Ma
PX-01-01	496	991	0.50	0.0565	0.0014		0.549	0.013		0.0705	0.0011		444	9	439	7
PX-01-02	11523	3244	3.55	0.069	0.0025		1.398	0.049		0.1471	0.0026		888	21	885	15
PX-01-03	21000	7323	2.87	0.0692	0.0012		1.448	0.025		0.1518	0.0021		909	11	911	12
PX-01-04	23753	4637	5.12	0.0703	0.0023		1.483	0.047		0.1531	0.0027		924	19	918	15
PX-01-05	14563	3956	3.68	0.0701	0.0009		1.465	0.018		0.1515	0.002		916	7	909	11
PX-01-06	19101	6362	3.00	0.0699	0.0015		1.425	0.029		0.1478	0.0022		900	12	889	12
PX-01-07	1294	523	2.48	0.0704	0.0015		1.499	0.031		0.1545	0.0025		930	13	926	14
PX-01-08	767	502	1.53	0.0678	0.0028		1.310	0.052		0.1402	0.0027		850	23	846	15
PX-01-09	143	685	0.21	0.0697	0.0015		1.447	0.030		0.1505	0.0022		909	12	904	12
PX-01-10	428	218	1.96	0.0707	0.0019		1.554	0.039		0.1595	0.0025		952	16	954	14
PX-01-11	22772	5737	3.97	0.0712	0.0012		1.482	0.025		0.151	0.0021		923	10	906	12
PX-01-12	12677	3349	3.79	0.0518	0.0008		0.289	0.005		0.0404	0.0006		258	4	255	3
PX-01-13	15071	3007	5.01	0.0528	0.0009		0.286	0.005		0.0393	0.0006		255	4	248	3
PX-01-14	12172	3948	3.08	0.0737	0.001		1.723	0.028		0.1696	0.0024		1017	11	1010	13
PX-01-15	10739	5139	2.09	0.0559	0.0016		0.557	0.015		0.0722	0.0011		449	10	450	7
PX-01-16	9244	4683	1.97	0.0565	0.0008		0.557	0.008		0.0715	0.001		450	5	445	6
PX-01-17	9333	2963	3.15	0.0565	0.0011		0.555	0.010		0.0713	0.001		448	7	444	6
PX-01-18	18679	8841	2.11	0.056	0.0011		0.551	0.010		0.0714	0.001		446	7	444	6
PX-01-19	7820	2092	3.74	0.0559	0.001		0.539	0.009		0.07	0.001		438	6	436	6
PX-01-20	162	370	0.44	0.0719	0.0008		1.661	0.024		0.1678	0.0023		994	9	1000	12
PX-01-21	733	805	0.91	0.0672	0.0009		1.247	0.019		0.1347	0.0018		822	9	814	10
PX-01-22	309	431	0.72	0.0513	0.0012		0.280	0.007		0.0396	0.0006		251	5	250	4
PX-01-23	333	1826	0.18	0.0546	0.0018		0.301	0.010		0.04	0.0007		267	8	253	4
PX-01-24	608	694	0.88	0.0528	0.0027		0.288	0.014		0.0395	0.0006		257	11	250	4
PX-01-25	85	55	1.55	0.0756	0.001		1.681	0.026		0.1619	0.0021		1001	10	968	12
PX-01-26	440	234	1.88	0.053	0.0013		0.295	0.008		0.0404	0.0006		262	6	255	4
PX-01-27	463	812	0.57	0.0531	0.0014		0.286	0.008		0.0391	0.0006		256	6	247	4
PX-01-28	309	735	0.42	0.0565	0.0007		0.549	0.007		0.0705	0.001		445	5	439	6
PX-01-29	7100	2319	3.06	0.0699	0.0014		1.430	0.027		0.1485	0.0021		902	11	892	12
PX-01-30	1311	4111	0.32	0.0656	0.0009		1.234	0.020		0.1365	0.0018		816	9	825	10
PX-01-31	15688	6985	2.25	0.0505	0.0007		0.284	0.004		0.0407	0.0006		254	3	257	3
PX-01-32	21399	5716	3.74	0.0672	0.0012		1.229	0.021		0.1328	0.0019		814	10	804	11
PX-01-33	15307	6410	2.39	0.056	0.0009		0.535	0.009		0.0694	0.001		435	6	432	6
PX-01-34	18526	9264	2.00	0.0568	0.0018		0.535	0.016		0.0683	0.0011		435	11	426	7
PX-01-35	203	3147	0.06	0.0512	0.0012		0.306	0.007		0.0433	0.0006		271	5	273	4
PX-02-01	248	1077	0.23	0.056	0.0016		0.492	0.012		0.0633	0.0005		406	8	396	3
PX-02-02	551	1055	0.52	0.0666	0.0013		1.271	0.025		0.138	0.001		833	11	834	6
PX-02-03	235	701	0.34	0.0523	0.0019		0.284	0.010		0.0395	0.0005		254	8	250	3
PX-02-04	1202	828	1.45	0.0646	0.0024		0.917	0.027		0.1015	0.0017		661	14	623	10
PX-02-05	784	759	1.03	0.0594	0.0022		0.904	0.030		0.1083	0.0022		654	16	663	13
PX-02-06	1096	846	1.30	0.0622	0.0022		0.931	0.021		0.1081	0.0012		668	11	662	7
PX-02-07	390	935	0.42	0.0614	0.002		0.579	0.018		0.0674	0.0012		464	12	420	7
PX-02-08	1445	2154	0.67	0.0589	0.0021		0.619	0.011		0.0766	0.0007		489	7	476	4
PX-02-09	317	623	0.51	0.0556	0.0019		0.542	0.018		0.07	0.0009		440	12	436	6
PX-02-10	342	632	0.54	0.0547	0.0019		0.531	0.017		0.0705	0.0009		433	11	439	5
PX-02-11	540	933	0.58	0.0544	0.0014		0.524	0.014		0.07	0.0008		428	9	436	5
PX-02-12	749	1224	0.61	0.0586	0.0019		0.568	0.015		0.0701	0.0009		457	10	437	5
PX-02-13	563	846	0.67	0.0549	0.0016		0.530	0.015		0.0702	0.0008		432	10	437	5
PX-02-14	509	996	0.51	0.052	0.0015		0.508	0.015		0.0703	0.0011		417	10	438	7
PX-02-15	231	416	0.56	0.0544	0.0022		0.425	0.017		0.0567	0.0007		360	12	356	4
PX-02-16	1590	2146	0.74	0.0618	0.002		0.335	0.008		0.0395	0.0006		293	6	250	4
PX-02-17	229	1163	0.20	0.079	0.002		1.301	0.042		0.1217	0.0031		846	19	741	18
PX-02-18	629	1146	0.55	0.0572	0.0018		0.549	0.014		0.0699	0.0008		445	9	436	5
PX-02-19	405	702	0.58	0.1022	0.0049		1.083	0.049		0.0758	0.0012		745	24	471	7
PX-02-20	153	272	0.56	0.0588	0.0038		0.369	0.024		0.0456	0.0008		319	18	287	5
PX-02-21	4132	3842	1.08	0.0531	0.0011		0.316	0.007		0.0432	0.0005		279	6	272	3
PX-02-22	1241	1761	0.70	0.0584	0.002		0.603	0.014		0.0751	0.0008		479	9	467	5
PX-02-23	412	872	0.47	0.0554	0.0021		0.538	0.014		0.0706	0.0008		437	9	440	5
PX-02-24	2369	2513	0.94	0.0593	0.0012		0.300	0.007		0.0366	0.0004		266	5	232	2
PX-02-25	1004	915	1.10	0.057	0.0015		0.414	0.012		0.0525	0.0006		352	9	330	4
PX-02-26	52	151	0.34	0.0649	0.0041		0.693	0.046		0.0788	0.0015		535	28	489	9
PX-02-27	1185	1572	0.75	0.0535	0.0015		0.484	0.011		0.0655	0.0006		401	8	409	4
PX-02-28	1234	1804	0.68	0.0552	0.0015		0.508	0.011		0.0667	0.0007		417	8	417	4
PX-02-29	1165	3189	0.37	0.0542	0.0011		0.323	0.008		0.0431	0.0005		285	6	272	3
PX-02-30	1193	1427	0.84	0.0655	0.002	0.633	0.015	0.0701	0.0008	498	10	437	5
PX-02-31	618	1453	0.43	0.0546	0.0014	0.530	0.012	0.0699	0.0007	432	8	436	4
PX-02-32	666	1239	0.54	0.0564	0.0012	0.536	0.012	0.0689	0.0007	436	8	430	4
PX-02-33	845	1494	0.57	0.0518	0.002	0.520	0.012	0.0722	0.001	425	8	449	6
PX-02-34	587	680	0.86	0.0674	0.0009	1.268	0.020	0.1365	0.0019	831	9	825	11
PX-02-35	233	322	0.72	0.0609	0.005	0.582	0.047	0.0692	0.0011	465	30	431	7
PX-03-01	208	733	0.28	0.0516	0.0018	0.267	0.010	0.0376	0.0005	240	8	238	3
PX-03-02	214	832	0.26	0.0502	0.0015	0.256	0.008	0.0371	0.0004	232	7	235	3
PX-03-03	249	904	0.28	0.0506	0.0018	0.258	0.010	0.0369	0.0005	233	8	234	3
PX-03-04	178	1148	0.15	0.0517	0.0015	0.252	0.008	0.0353	0.0005	228	6	224	3
PX-03-05	186	691	0.27	0.0514	0.0023	0.251	0.011	0.0358	0.0005	228	9	227	3
PX-03-06	222	705	0.32	0.055	0.0021	0.269	0.012	0.0353	0.0005	242	9	223	3
PX-03-07	309	785	0.39	0.0516	0.002	0.250	0.010	0.0353	0.0005	227	8	224	3
PX-03-08	353	1169	0.30	0.0511	0.0015	0.247	0.007	0.0352	0.0004	224	6	223	3
PX-03-09	320	1387	0.23	0.0507	0.0016	0.245	0.008	0.0351	0.0004	222	6	222	3
PX-03-10	83	640	0.13	0.0514	0.002	0.250	0.010	0.0353	0.0004	227	8	224	3
PX-03-11	257	794	0.32	0.0507	0.0017	0.247	0.009	0.0353	0.0004	224	7	224	3
PX-03-12	278	1002	0.28	0.0502	0.0019	0.242	0.009	0.0351	0.0004	220	7	223	3
PX-03-13	286	916	0.31	0.0522	0.0018	0.253	0.009	0.0352	0.0004	229	7	223	3
PX-03-14	194	693	0.28	0.0498	0.002	0.240	0.010	0.0351	0.0005	219	8	222	3
PX-03-15	363	1046	0.35	0.0495	0.0015	0.242	0.007	0.0356	0.0004	220	6	225	3
PX-03-16	400	1234	0.32	0.052	0.0015	0.257	0.008	0.0358	0.0004	232	7	227	3
PX-03-17	136	571	0.24	0.0517	0.0022	0.254	0.010	0.036	0.0005	230	8	228	3
PX-03-18	274	762	0.36	0.0506	0.0021	0.249	0.011	0.0358	0.0005	226	9	227	3
PX-03-19	673	1353	0.50	0.0495	0.0014	0.248	0.008	0.0362	0.0004	225	6	229	3
PX-03-20	318	1196	0.27	0.053	0.0017	0.265	0.009	0.0361	0.0004	239	7	229	2
PX-03-21	409	1329	0.31	0.0506	0.0014	0.252	0.007	0.0359	0.0005	228	6	228	3
PX-03-22	543	1127	0.48	0.0542	0.0019	0.271	0.010	0.0361	0.0005	244	8	228	3
PX-03-23	253	1276	0.20	0.0503	0.0016	0.249	0.008	0.0359	0.0004	226	7	227	3
PX-03-24	229	875	0.26	0.0487	0.0017	0.240	0.009	0.0358	0.0005	219	7	227	3
PX-03-25	222	860	0.26	0.0508	0.0017	0.253	0.009	0.0362	0.0004	229	7	229	3
PX-03-26	375	1318	0.28	0.0512	0.0013	0.253	0.007	0.0358	0.0004	229	5	227	3
PX-03-27	149	571	0.26	0.0504	0.0022	0.247	0.011	0.0358	0.0005	224	9	227	3
PX-03-28	139	830	0.17	0.0516	0.0019	0.255	0.009	0.0362	0.0005	231	7	229	3
PX-03-29	245	1120	0.22	0.0519	0.0016	0.259	0.008	0.0364	0.0005	234	6	230	3
PX-03-30	244	1069	0.23	0.0523	0.0015	0.262	0.008	0.0364	0.0005	236	6	231	3
PX-03-31	219	880	0.25	0.0537	0.0018	0.268	0.010	0.0364	0.0006	241	8	231	4
PX-03-32	293	961	0.31	0.0531	0.002	0.266	0.010	0.0367	0.0006	240	8	232	4
PX-03-33	296	1650	0.18	0.0554	0.0015	0.286	0.010	0.0373	0.0007	255	8	236	4
PX-03-34	150	755	0.20	0.0512	0.002	0.255	0.010	0.0365	0.0006	231	8	231	4
PX-03-35	393	1029	0.38	0.0502	0.0019	0.251	0.009	0.0367	0.0006	227	7	232	4
PX-03-36	336	1290	0.26	0.0507	0.0013	0.265	0.008	0.0379	0.0006	239	7	240	4
PX-03-37	298	715	0.42	0.0532	0.0018	0.271	0.011	0.0369	0.0007	244	9	234	4
PX-03-38	155	733	0.21	0.0515	0.0017	0.261	0.009	0.0369	0.0006	235	7	234	4
PX-03-39	265	1205	0.22	0.0499	0.0014	0.249	0.008	0.0364	0.0006	226	6	230	4
PX-03-40	220	998	0.22	0.0512	0.0018	0.255	0.010	0.0361	0.0006	231	8	228	4
PX-03-41	223	848	0.26	0.0488	0.0015	0.244	0.008	0.0363	0.0005	222	7	230	3

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表 3 凭祥英安岩锆石Lu-Hf同位素数据表

Table 3. Zircon Lu-Hf isotopic data of dacites in Pingxiang

样号	age/Ma	¹⁷⁶Hf/¹⁷⁷Hf	σ	¹⁷⁶Lu/¹⁷⁷Hf	σ	¹⁷⁶Yb/¹⁷⁷Hf	σ	eHf present	eHf (T)	TDM	TDMC	fs
PX-01-01	439	0.282573	0.000024	0.001281	0.000035	0.035012	0.000842	-7	2.2	968	1276	-0.96
PX-01-02	885	0.282622	0.00002	0.000746	0.000012	0.024693	0.000265	-5.3	13.9	886	886	-0.98
PX-01-03	911	0.282625	0.000026	0.001172	0.000031	0.030277	0.000783	-5.2	14.3	891	879	-0.96
PX-01-04	918	0.282598	0.000022	0.000793	0.00001	0.026132	0.000349	-6.2	13.7	921	922	-0.98
PX-01-05	909	0.282605	0.000023	0.001024	0.000008	0.033749	0.000182	-5.9	13.6	917	922	-0.97
PX-01-06	889	0.282567	0.000025	0.001234	0.000018	0.038016	0.000268	-7.2	11.7	975	1026	-0.96
PX-01-07	926	0.28258	0.000023	0.000828	0.000011	0.02659	0.00028	-6.8	13.2	947	960	-0.98
PX-01-08	846	0.282557	0.000029	0.000756	0.000013	0.022969	0.000223	-7.6	10.7	977	1057	-0.98
PX-01-09	904	0.282622	0.000034	0.0015	0.000105	0.042225	0.002476	-5.3	13.8	905	905	-0.95
PX-01-10	954	0.282618	0.000022	0.000877	0.000008	0.028426	0.000318	-5.4	15.1	894	858	-0.97
PX-01-11	906	0.282638	0.000024	0.000989	0.000013	0.033024	0.000668	-4.7	14.7	869	847	-0.97
PX-01-12	255	0.282234	0.000023	0.001209	0.000026	0.037345	0.000412	-19	-13.6	1444	2132	-0.96
PX-01-13	248	0.282165	0.000078	0.002692	0.000086	0.079642	0.001972	-21.5	-16.5	1603	2302	-0.92
PX-01-14	1010	0.282287	0.000018	0.000975	0.000029	0.03366	0.00114	-17.2	4.5	1361	1570	-0.97
PX-01-15	450	0.282287	0.000025	0.001703	0.00004	0.056724	0.000628	-17.2	-7.8	1388	1914	-0.95
PX-01-16	445	0.282336	0.000023	0.001138	0.000007	0.033856	0.000134	-15.4	-6	1298	1797	-0.97
PX-01-17	444	0.282389	0.000028	0.00161	0.000035	0.053194	0.001075	-13.6	-4.3	1240	1690	-0.95
PX-01-19	436	0.282493	0.000059	0.002601	0.000055	0.0815	0.00165	-9.9	-1	1121	1481	-0.92

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