塔里木南缘布雅花岗岩和暗色包体的锆石U-Pb年代学及地球化学特征

胡雪原; 郭瑞清; 努尔喀纳提·马达依普; 郭羽; 邹明煜; 吕彪; 魏震

doi:10.15898/j.cnki.11-2131/td.201703190035

塔里木南缘布雅花岗岩和暗色包体的锆石U-Pb年代学及地球化学特征

新疆大学地质与矿业工程学院, 新疆乌鲁木齐 830047

基金项目:
中国地质调查局地质调查项目“中国主要陆块晚前寒武纪以来裂解重组过程的再造及其对成矿作用的制约”（1212011121064）专题“新疆塔里木南缘南华纪至三叠纪聚散过程研究”（212-61717）

详细信息

作者简介: 胡雪原, 硕士研究生, 矿物学、岩石学、矿床学专业。E-mail:1553767881@qq.com

通讯作者: 郭瑞清, 副教授, 硕士生导师, 从事岩石学及大地构造科研和教学工作。E-mail:guoruiqing8888@163.com

中图分类号: P575.5

收稿日期: 2017-03-19

修回日期: 2017-06-15

录用日期: 2017-07-20

Zircon U-Pb Dating, Petrology, Geochemistry of the Buya Pluton and Its MMEs in the Southern Margin of Tarim, Xinjiang

College of Geology and Mining Engineering, Xinjiang University, Urumqi 830047, China

More Information

Corresponding author: Rui-qing GUO, guoruiqing8888@163.com

Received Date: 19 March 2017

Revised Date: 15 June 2017

Accepted Date: 20 July 2017

摘要

摘要: 塔里木西南缘铁克里克地区广泛发育早古生代中酸性侵入岩，本文对其中布雅岩体及其暗色包体进行系统的岩石学、年代学及岩石地球化学研究，确定了岩石成因及其构造属性。LA-MC-ICP-MS锆石U-Pb年代学研究表明，寄主石英二长闪长岩结晶年龄为432.6±2.5 Ma（MSWD=1.5），暗色包体结晶年龄为432.4±6.4 Ma（MSWD=0.031），二者形成时代相同，均为志留纪早期岩浆活动的产物。地球化学特征表明，布雅暗色包体应来源于地幔的部分熔融，而寄主岩石岩浆具有壳源岩浆的性质并经历了幔源岩浆不均匀的混合。野外及岩相学特征均显示暗色包体为铁镁质岩浆注入长英质岩浆快速冷凝形成的，是幔源岩浆底侵下地壳形成的岩浆混合作用的产物。它们是塔里木南缘早古生代碰撞造山作用晚期的岩浆记录。
- 铁克里克 /
- 布雅岩体 /
- LA-MC-ICP-MS锆石U-Pb年代学 /
- 岩浆混合
Abstract: Paleozoic acidic intrusive rocks are widespread in the Tiekelike tectonic belt of the southern margin of Tarim. Petrography, whole-rock major and trace elements, and zircon U-Pb dating are reported for the Buya granodiorite and its mafic microgranular enclaves (MMEs), which are used to constrain their petrogenesis and tectonic setting. High-precision LA-MC-ICP-MS zircon U-Pb dating has revealed that the quartz monzobiorite was formed at 432.6±2.5 Ma (MSWD=1.5), and its microgranular enclaves were formed at 432.4±6.4 Ma (MSWD=0.031) indicating that both of them are the products of early Silurian magma activity. Chemical composition suggests that the enclaves were derived from partial melting of the mantle, while the magma of the host rocks is mainly crustal and is mixed with minor mantle-derived magma. Both the field and petrographic characteristics show that the dark enclaves were formed by the rapid condensation of the mafic magma into the felsic magma, which is the product of the magmatic mixing by the mantle underplating of the lower crust. They are magmatic records of the late stage of early Paleozoic collision orogeny in the southern margin of Tarim.
- Tiekelike tectonic belt /
- Buya pluton /
- LA-MC-ICP-MS zircon U-Pb dating /
- magma mixing

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图 1 研究区地质图

Figure 1.

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图 2 布雅寄主岩及其暗色包体的野外及镜下照片

Figure 2.

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图 3 布雅寄主岩和暗色包体的阴极发光图像

Figure 3.

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图 4 布雅寄主岩(a、b)和暗色包体(c、d)的锆石LA-MC-ICP-MS U-Pb年龄谐和图和加权平均图

Figure 4.

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图 5 (a) 布雅岩体的TAS岩石分类图解、(b)SiO₂-K₂O岩石系列图解、(c)寄主岩和暗色包体的稀土元素球粒陨石标准化配分图、(d)微量元素原始地幔标准化蛛网图。布雅碱性花岗岩数据引自文献[25]

Figure 5.

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图 6 暗色包体及其寄主岩主量元素同分母氧化物比值协变图(a、b)和微量元素协变图(c、d)

Figure 6.

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表 1 布雅寄主岩与暗色包体LA-MC-ICP-MS锆石U-Pb测试结果

Table 1. LA-MC-ICP-MS U-Pb data and calculated ages of zircons in host rocks and mafic enclaves from the Buya pluton

测点号	含量(×10^-6)		Th/U	同位素比值						年龄(Ma)
	Th	U		²⁰⁷Pb/²⁰⁶U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
石英二长闪长岩
TKJZ-1	581	2133	0.27	0.05506	0.00122	0.52439	0.01025	0.0691	0.00073	415	51	428	7	431	4
TKJZ-2	713	1876	0.38	0.05706	0.00135	0.55408	0.01169	0.0704	0.00075	494	53	448	8	439	5
TKJZ-3	393	1366	0.29	0.0583	0.00131	0.56484	0.00787	0.0703	0.00074	541	14	455	5	438	4
TKJZ-4	426	1404	0.30	0.05572	0.00128	0.54671	0.00818	0.0712	0.00076	441	16	443	5	443	5
TKJZ-5	854	1894	0.45	0.05736	0.00149	0.54922	0.0129	0.0694	0.00076	506	58	444	8	433	5
TKJZ-6	722	2806	0.26	0.05553	0.00122	0.52972	0.01018	0.0692	0.00073	434	50	432	7	431	4
TKJZ-7	294	1151	0.26	0.05575	0.00147	0.52903	0.01267	0.0688	0.00076	442	60	431	8	429	5
TKJZ-8	933	2075	0.45	0.05726	0.00128	0.54715	0.00767	0.0693	0.00074	502	14	443	5	432	4
TKJZ-9	677	1724	0.39	0.05696	0.00143	0.54226	0.01223	0.069	0.00075	490	57	440	8	430	5
TKJZ-10	528	1482	0.36	0.05729	0.00139	0.55347	0.00925	0.0701	0.00077	503	19	447	6	437	5
TKJZ-11	533	1495	0.36	0.05652	0.00149	0.5348	0.01283	0.0686	0.00076	473	60	435	8	428	5
TKJZ-12	442	1211	0.36	0.05664	0.00132	0.54606	0.00834	0.07	0.00076	478	16	442	5	436	5
TKJZ-13	2293	3947	0.58	0.05572	0.00181	0.52254	0.01595	0.068	0.00077	441	74	427	11	424	5
TKJZ-14	652	2113	0.31	0.05542	0.00132	0.53044	0.0112	0.0694	0.00076	429	54	432	7	433	5
TKJZ-15	406	1244	0.33	0.05581	0.00145	0.53027	0.01246	0.0689	0.00077	445	59	432	8	430	5
TKJZ-16	634	1612	0.39	0.0557	0.00156	0.52592	0.01349	0.0685	0.00077	440	64	429	9	427	5
TKJZ-17	568	2188	0.26	0.05645	0.00125	0.52985	0.01027	0.0681	0.00074	470	50	432	7	425	4
TKJZ-18	447	1361	0.33	0.05887	0.00137	0.58051	0.01189	0.0715	0.00079	562	52	465	8	445	5
TKJZ-19	380	1321	0.29	0.05553	0.00141	0.5429	0.01244	0.0709	0.00078	433	58	440	8	442	5
TKJZ-20	641	2094	0.31	0.05469	0.00146	0.5099	0.01241	0.0676	0.00076	400	61	418	8	422	5
TKJZ-21	458	1293	0.35	0.05545	0.00173	0.52707	0.01528	0.0689	0.0008	430	71	430	10	430	5
TKJZ-22	557	1651	0.34	0.0586	0.00139	0.56341	0.00897	0.0697	0.00078	552	17	454	6	434	5
TKJZ-23	530	1971	0.27	0.05658	0.0013	0.54364	0.00813	0.0697	0.00077	475	16	441	5	434	5
暗色包体
TKBT-1	550	1888	0.29	0.05686	0.00154	0.54231	0.0164	0.0692	0.00173	486	30	440	11	431	10
TKBT-2	2482	1740	1.43	0.05523	0.00134	0.53056	0.01477	0.0697	0.00173	422	28	432	10	434	10
TKBT-3	388	1349	0.29	0.05544	0.00141	0.53181	0.01545	0.0696	0.00175	430	29	433	10	434	11
TKBT-4	410	1415	0.29	0.05611	0.00132	0.54013	0.01484	0.0698	0.00176	457	27	439	10	435	11
TKBT-5	876	2581	0.34	0.05691	0.00141	0.54128	0.01554	0.069	0.00175	488	28	439	10	430	11
TKBT-6	491	2089	0.23	0.05495	0.00132	0.52882	0.01485	0.0698	0.00177	410	28	431	10	435	11
TKBT-7	752	2494	0.30	0.05572	0.00134	0.53315	0.01501	0.0694	0.00176	441	28	434	10	433	11
TKBT-8	697	2176	0.32	0.05675	0.0016	0.54098	0.01708	0.0692	0.00178	482	32	439	11	431	11
TKBT-9	443	1605	0.28	0.05587	0.00129	0.53316	0.0146	0.0692	0.00176	447	27	434	10	431	11
TKBT-10	646	1981	0.33	0.05682	0.00143	0.54051	0.01579	0.069	0.00177	485	29	439	10	430	11
TKBT-11	2576	2574	1.00	0.05672	0.00142	0.54192	0.01577	0.0693	0.00178	481	29	440	10	432	11

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表 2 布雅寄主岩与暗色包体的全岩主量(%)与微量元素(×10^-6)组成

Table 2. Major and trace element compositions of host rock and its MMEs from the Buya pluton

岩性	石英二长闪长岩						二长花岗岩								暗色包体
样品编号	TK03-1	TK03-2	TK04-1	TK04-2	TK05-1	TK05-2	TK07-1	TK07-2	TK08-1	TK03-10	TK03-11	TK03-12	TK03-13	TK03-14	TK03-15	TK03-16	TK03-17	TK03-18
SiO₂	64.3	63.3	68.1	67.9	67.0	66.5	71.0	70.1	70.5	70.4	70.9	70.5	70.4	70.5	61.7	60.7	54.4	54.6
Al₂O₃	15.7	15.2	15.3	15.2	16.2	16.1	15.2	15.4	15.35	14.8	15.6	15.4	15.3	15.3	15.1	13.5	13.9	14.2
Fe₂O₃^T	4.87	5.19	3.06	3.04	2.79	2.61	1.48	1.52	1.66	1.37	1.38	1.33	1.46	1.49	6.48	7.64	7.24	7.09
CaO	3.40	3.51	2.46	2.42	2.34	2.23	1.04	1.08	1.04	1.48	1.10	1.07	1.04	0.97	4.37	4.89	8.30	7.90
MgO	2.06	2.26	1.10	1.06	0.96	0.91	0.43	0.49	0.42	0.19	0.34	0.34	0.42	0.27	2.97	3.47	6.1	5.75
Na₂O	4.64	4.40	4.90	4.84	5.11	5.08	4.85	4.72	5.15	4.81	5.01	4.93	5.07	5.06	4.77	4.62	3.86	3.93
K₂O	4.21	4.15	4.01	3.89	4.47	4.44	4.9	5.21	4.55	4.72	5.10	5.00	4.95	4.86	2.89	1.50	3.19	3.33
TiO₂	0.47	0.53	0.28	0.28	0.3	0.28	0.18	0.24	0.19	0.19	0.18	0.18	0.18	0.16	0.64	0.76	0.86	0.83
MnO	0.11	0.12	0.07	0.07	0.06	0.06	0.03	0.03	0.03	0.03	0.03	0.03	0.03	0.03	0.87	1.03	0.98	0.96
P₂O₅	0.21	0.21	0.14	0.14	0.17	0.15	0.07	0.09	0.07	0.07	0.07	0.07	0.07	0.05	0.23	0.38	0.94	0.9
LOI	0.40	0.45	0.42	0.43	0.63	0.79	0.61	0.38	0.53	1.17	0.38	0.27	0.56	0.69	0.36	1.71	1.03	0.9
总计	100.6	99.6	100.1	99.5	100.3	99.5	99.9	99.5	99.7	99.4	100.2	99.3	99.7	99.6	99.8	99.5	100.2	99.9
A/CNK	0.85	0.84	0.91	0.92	0.93	0.94	1.00	1.00	1.00	0.94	0.99	0.99	0.98	1.00	0.8	0.75	0.56	0.58
Na₂O+K₂O	8.85	8.55	8.91	8.73	9.58	9.52	9.75	9.93	9.7	9.53	10.11	9.95	10	9.92	7.66	6.12	7.05	7.26
K₂O/Na₂O	0.91	0.94	0.82	0.8	0.87	0.87	1.01	1.10	0.88	0.98	1.00	1.00	0.98	0.96	0.61	0.32	0.83	0.85
Mg^#	0.50	0.50	0.46	0.45	0.45	0.45	0.4	0.41	0.40	0.21	0.36	0.36	0.40	0.30	0.29	0.52	0.51	0.66
La	79.1	88.8	57.9	55.3	68.3	64.8	45.2	57.2	43	47.7	36.6	36.8	45.3	27.2	88.8	134	140.5	142
Ce	150	169	110	105	128	122	83	105	81	84	67	68	82	51	178	254	281	280
Pr	15.8	17.9	11.2	10.9	13.3	12.3	8.4	10.7	8.3	8.6	6.7	6.7	8.3	5.1	19	26.7	30.8	30.4
Nd	53.7	61.6	37.7	36.9	43.8	41.2	26.9	34.7	26.8	28.3	21.4	21.2	26.5	16.5	65.7	90.2	106.5	106.5
Sm	9.4	11.0	6.5	6.4	7.8	7.2	4.3	5.5	4.1	4.5	3.5	3.4	4.3	2.9	12.2	15.1	17.6	17.3
Eu	2.12	2.5	1.53	1.47	1.74	1.56	0.9	1.09	0.95	0.96	0.79	0.76	0.93	0.61	2.6	3.26	3.83	3.76
Gd	6.06	7.4	4.47	4.53	4.77	4.65	2.46	2.93	2.45	2.65	2.09	2.09	2.5	1.87	8.08	10.5	10.55	10.45
Tb	0.7	0.91	0.5	0.55	0.56	0.54	0.28	0.31	0.28	0.3	0.21	0.22	0.25	0.22	0.99	1.23	1.11	1.1
Dy	3.78	4.4	2.66	2.65	2.88	2.59	1.3	1.41	1.37	1.22	1.01	1.04	1.27	1.01	4.81	6.18	5.08	4.89
Ho	0.62	0.79	0.47	0.48	0.46	0.47	0.19	0.21	0.22	0.19	0.16	0.16	0.17	0.16	0.83	1.07	0.83	0.77
Er	1.72	2.1	1.28	1.15	1.33	1.3	0.56	0.61	0.58	0.58	0.49	0.41	0.49	0.47	2.3	2.96	1.95	1.82
Tm	0.24	0.24	0.18	0.21	0.18	0.16	0.08	0.07	0.08	0.06	0.05	0.05	0.08	0.06	0.31	0.4	0.22	0.23
Yb	1.41	1.75	1.13	1.1	1.14	1.09	0.4	0.45	0.38	0.49	0.39	0.3	0.35	0.38	2.06	2.59	1.41	1.43
Lu	0.21	0.27	0.18	0.17	0.16	0.16	0.04	0.05	0.06	0.06	0.06	0.03	0.04	0.07	0.3	0.39	0.21	0.21
Rb	180	188	153	150	168	168	221	244	204	230	263	265	223	255	159	117.5	202	204
Ba	1440	1415	929	894	1610	1570	1260	1210	1175	1250	1210	1180	1280	1145	431	234	1110	1170
Th	32.8	35.6	29.3	29.6	33.6	32.4	24.1	26	25.1	29.3	23.5	23.1	22.7	28.6	41.4	54.2	50.3	50.6
U	4.6	4.9	4.3	4.5	5.2	5.8	3.5	3.2	4.6	4.7	3.8	3.9	3.7	6.2	6.8	7.7	11.4	10.2
K	34949	34451	33289	32293	37108	36859	40677	43250	37771	39183	42337	41673	41092	40345	23991	12452	26481	27643
Nb	18.7	22.4	15.7	15.8	16.2	15.5	10.8	12.1	11.2	12.4	13.2	13.6	11.5	15.7	24.8	31.4	25.1	22.3
Ta	1.3	1.6	1.2	1.2	1.3	1.2	0.9	1.0	1.0	1.0	1.0	1.1	0.9	1.3	1.7	2.2	1.4	1.3
Sr	1065	1045	960	937	1320	1315	793	779	788	690	756	769	792	714	891	756	1310	1380
P	916	916	611	611	742	654	305	393	305	305	305	305	305	218	1003	1658	4101	3927
Zr	255	278	214	216	234	236	146	177	151	162	145	145	149	137	341	424	247	247
Hf	6.3	6.7	5.7	5.7	5.9	5.8	3.8	4.6	4.2	4.6	4.5	4.4	4.4	4.7	8.9	10.4	6.1	5.8
Ti	2817	3177	1678	1678	1798	1678	1079	1439	1139	1139	1079	1079	1079	959	3836	4555	5155	4975
Y	18.8	22.5	14.5	14.1	14.4	13.9	6.1	6.8	6.3	6.3	5.2	5.3	5.8	5.4	24.7	31.9	22.4	22.2
Cr	60	70	40	50	30	40	30	20	20	20	10	20	10	20	90	90	190	180
Ni	19	21	20	23	20	17	13	12	11	13	12	11	12	15	32	32	77	68
ΣREE	324.9	368.7	236.3	227.4	274.9	259.9	173.6	220.7	169.5	180	140.5	141.1	172.9	107.4	386.5	548.6	601.6	600.9
LREE/HREE	21.04	19.64	20.74	19.98	22.95	22.72	31.71	35.54	30.27	31.44	30.51	31.82	32.58	24.34	18.64	20.67	27.16	27.75
(La/Yb)_N	40.24	36.4	36.75	36.06	42.98	42.64	81.05	91.18	81.17	69.83	67.32	87.99	92.84	51.34	30.92	37.11	71.48	71.23
δEu	0.86	0.85	0.86	0.83	0.87	0.83	0.84	0.83	0.92	0.85	0.89	0.87	0.86	0.8	0.8	0.79	0.86	0.85

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