北阿尔金野马泉二长花岗岩成因及其构造意义

郑坤; 吴才来; 郜源红; 郭文峰; 陈红杰; 吴迪; 高栋

doi:10.3799/dqkx.2018.719

北阿尔金野马泉二长花岗岩成因及其构造意义

doi: 10.3799/dqkx.2018.719

郑坤^1,2,,
吴才来^1, ,,
郜源红¹,
郭文峰¹,
陈红杰¹,
吴迪³,
高栋¹

1.
中国地质科学院地质研究所, 北京 100037
2.
北京大学地球与空间科学学院, 北京 100871
3.
中国地质大学地球科学与资源学院, 北京 100083

基金项目:

中国地质调查局项目 121201102000150005-06

中国地质调查局项目 12120115027001

国家自然科学基金项目 41272079

详细信息

作者简介:
郑坤(1989-), 男, 博士, 矿物学、岩石学、矿床学专业

通讯作者:
吴才来, E-mail:wucailai@126.com

中图分类号: P581
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- 被引次数: 0
出版历程
- 收稿日期: 2017-12-20
- 刊出日期: 2018-04-15

Petrogenesis and Tectonic Implications of Yemaquan Monzogranite from North Altyn

Zheng Kun^{1,2
,},
Wu Cailai^{1
, ,},
Gao Yuanhong¹,
Guo Wenfeng¹,
Chen Hongjie¹,
Wu Di³,
Gao Dong¹

1.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
School of Earth and Space Sciences, Peking University, Beijing 100871, China
3.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

摘要

摘要: 野马泉二长花岗岩为北阿尔金地区出露面积最大的花岗岩体，为探讨其成因、形成环境及其与北阿尔金区域构造演化的关系，对其进行了岩石学、地球化学、锆石U-Pb年代学及Hf同位素等方面的研究.研究结果表明，野马泉岩体为中-粗粒等粒或似斑状二长花岗岩，岩体侵位时代为450~453 Ma.岩石具较高的Na₂O/K₂O比值为1.72~2.29，铝饱和指数A/CNK为0.99~1.10，P₂O₅与SiO₂含量呈负相关，具Ⅰ型花岗岩特征.轻稀土富集而重稀土亏损，较弱的负Eu异常，微量元素特征显示富集Rb、Ba、Th、U、K等元素，相对亏损Nb、Ta、P、Ti等元素.锆石ε_Hf（t）值为5.52~10.75，二阶段模式年龄t_DM2为0.75~1.09 Ga，其源岩可能主要是0.75~1.09 Ga的新生地壳（基性岩）.结合区域构造背景，野马泉二长花岗岩体可能形成于同碰撞-后碰撞环境，为造山带根部基性岩石部分熔融形成.
- 二长花岗岩 /
- 地球化学 /
- U-Pb年代学 /
- Hf同位素特征 /
- 岩石成因 /
- 北阿尔金
Abstract: Yemaquan monzogranite pluton is the largest outcrop in North Altyn, with a medium-coarse grain and porphyritic texture. This paper aims to discuss the genesis and diagenesis environment of the monzogranite, and the tectonic evolution of North Altyn. Thus, it is necessary to study petrology, geochemistry, zircon U-Pb chronology and Hf isotope of the pluton. The zircon U-Pb age data suggest that the monzogranite was generated at 450-453 Ma. The rock shows significant features of Ⅰ-Type granite with high ratio of Na₂O/K₂O (1.72-2.29), aluminum saturation index (A/CNK=0.99-1.10) and negative correlation between P₂O₅% and SiO₂%. The REE pattern shows depletion of HREE, relative enrichment of LREE, and slightly negative Eu anomaly. In the primitive mantle-normalized trace-element diagram, the rock shows strong enrichment of Rb, Ba, Th, U, K and depletion of Nb, Ta, P, Ti. The values of ε_Hf(t) range in 5.52-10.75. The two-stage model ages (t_DM2) vary from 0.75 to 1.09 Ga. These characteristics indicate that the source rock was formed from the juvenile crust (basites). Considering the regional tectonic setting, it is concluded that the monzogranite was generated by partial melting of the basites at the root of the orogenic belt in the syn-collision to post-collision environment.
- monzogranite /
- geochemistry /
- U-Pb chronology /
- Hf isotopic characteristics /
- petrogenesis /
- North Altyn

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图 1 北阿尔金巴什考供盆地以东的研究区地质简图

图a据吴才来等(2016)修改

Fig. 1. Geological sketch map of the study area at the east of Bashikaogong basin, North Altyn

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图 2 二长花岗岩野外露头照片和显微照片(正交偏光)

Qz.石英；Pl.斜长石；Kfs.钾长石；Bt.黑云母；Sph.榍石.据Whitney and Evans(2010)

Fig. 2. Field photograph and micrograph of the monzogranite

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图 3 二长花岗岩的A/CNK-A/NK图解(a)和K₂O-SiO₂图解(b)

图a据Maniar and Piccoli(1989)；图b据Rickwood(1989)

Fig. 3. A/NK-A/CNK diagram (a) and K₂O-SiO₂ plots of the monzogranite (b)

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图 4 二长花岗岩稀土元素球粒陨石标准化配分模式和微量元素蛛网图

据Sun and McDonough(1989)

Fig. 4. Chondrite-normalized REE patterns and trace element spider diagrams for the monzogranite

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图 5 二长花岗岩的锆石阴极发光图像和锆石U-Pb年龄谐和图

Fig. 5. Cathodoluminescence (CL) images of representative zircon grains and zircon U-Pb concordia plots of the monzogranite

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图 6 二长花岗岩SiO₂-P₂O₅图解

Fig. 6. SiO₂-P₂O₅ plot of the monzogranite

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图 7 二长花岗岩的锆石Hf同位素ε_Hf(t)-T图解

Fig. 7. Zircon Hf isotopic ε_Hf(t)-T plot of the monzogranite

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图 8 二长花岗岩的C/MF-A/MF图解(a)和K₂O+Na₂O+MgO+FeO^T+TiO₂-(K₂O+Na₂O)/(MgO+FeO^T+TiO₂)(b)图解

图a据Altherr et al.(2000)；图b据Kaygusuz et al.(2007)

Fig. 8. Geochemical diagrams of C/MF-A/MF (a) and K₂O+Na₂O+MgO+FeO^T+TiO₂-(K₂O+Na₂O)/(MgO+FeO^T+TiO₂) (b) for the monzogranite

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表 1 二长花岗岩主量元素(%)和微量元素(10^-6)数据

Table 1. Major (%) and trace element (10^-6) compositions of the monzogranite

样号	16CL225	16CL226	16CL227	16CL228	16CL229	16CL230
SiO₂	66.94	65.39	65.17	65.04	66.11	67.48
TiO₂	0.55	0.55	0.58	0.59	0.57	0.53
Al₂O₃	15.99	16.70	15.92	16.25	15.27	15.56
Fe₂O₃	1.35	1.36	1.54	1.28	1.44	1.29
FeO	2.14	2.05	1.98	2.24	2.02	1.85
MnO	0.07	0.08	0.07	0.08	0.07	0.07
MgO	1.80	1.81	1.77	1.80	1.76	1.66
CaO	2.46	3.68	3.51	3.49	3.14	3.31
Na₂O	4.54	4.58	4.30	4.55	4.18	4.32
K₂O	2.41	2.00	2.36	2.06	2.43	2.38
P₂O₅	0.18	0.19	0.19	0.20	0.19	0.17
LOI	1.39	1.45	2.44	2.27	2.61	1.24
Total	99.83	99.84	99.84	99.85	99.79	99.85
A/CNK	1.10	1.02	0.99	1.01	1.00	0.99
La	36.99	29.04	37.36	29.81	31.15	28.65
Ce	66.21	60.68	76.60	68.11	67.76	60.18
Pr	7.67	7.14	8.51	8.60	7.85	7.19
Nd	28.54	25.74	29.84	31.70	28.60	25.44
Sm	5.38	4.78	5.37	6.31	5.19	4.64
Eu	1.28	1.27	1.33	1.43	1.29	1.15
Gd	4.57	3.92	4.58	4.81	4.36	3.92
Tb	0.74	0.61	0.67	0.79	0.68	0.60
Dy	4.17	3.45	3.75	4.46	3.80	3.37
Ho	0.76	0.63	0.70	0.81	0.69	0.62
Er	2.20	1.85	1.92	2.35	1.91	1.74
Tm	0.34	0.28	0.29	0.37	0.29	0.27
Yb	2.03	1.83	1.87	2.33	1.86	1.76
Lu	0.28	0.28	0.28	0.33	0.27	0.27
∑REE	161.17	141.51	173.08	162.21	155.69	139.82
LREE/HREE	9.68	10.01	11.31	8.99	10.25	10.14
δEu	0.77	0.87	0.80	0.77	0.81	0.81
Cs	8.32	5.29	4.73	5.18	3.03	7.73
Rb	88.81	58.65	87.21	65.43	66.94	80.85
Ba	774.07	836.55	848.82	844.56	1015.78	778.97
Th	10.99	8.45	10.60	7.96	9.25	10.47
U	2.79	2.89	2.43	2.32	1.78	2.31
Ta	1.22	1.15	1.03	1.41	1.03	1.02
Nb	14.03	13.91	14.75	18.07	14.86	14.49
Sr	314.57	372.98	330.37	352.32	307.71	329.07
Hf	5.60	5.57	5.25	5.56	4.96	5.07
Zr	219.03	208.31	189.51	196.34	186.24	185.74
Y	20.64	18.60	18.69	22.95	19.10	18.11
Li	31.96	25.09	29.42	35.49	30.05	35.24
Be	2.48	3.19	3.17	3.12	2.30	2.72
Sc	6.73	7.59	9.94	8.36	6.14	5.97
Cr	25.13	22.01	28.39	21.98	16.94	16.46
Co	9.80	9.51	10.72	10.85	8.43	7.95
Ni	17.09	16.56	19.39	18.99	14.43	15.92
Pb	19.84	24.51	22.04	22.76	24.02	23.18
Rb/Sr	0.28	0.16	0.26	0.19	0.22	0.25
Sm/Nd	0.19	0.19	0.18	0.20	0.18	0.18
Nb/Ta	11.50	12.10	14.29	12.78	14.38	14.25
Zr/Hf	39.11	37.38	36.08	35.34	37.58	36.66

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表 2 二长花岗岩锆石LA-ICP-MS U-Pb定年测试结果

Table 2. LA-ICP-MS zircon U-Pb isotopic data of the monzogranite

样品测试点	含量(10^-6)			同位素比值						年龄(Ma)
样品测试点	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁶Pb/²³⁸U	1σ
16CL225-01	497	810	0.61	0.0551	0.0003	0.5446	0.0094	0.0717	0.0012	446.4	7.3
16CL225-02	649	898	0.72	0.0551	0.0003	0.5625	0.0090	0.0741	0.0012	460.5	7.1
16CL225-03	587	992	0.59	0.0578	0.0004	0.5786	0.0084	0.0725	0.0010	451.5	6.2
16CL225-04	506	876	0.58	0.0589	0.0004	0.5760	0.0109	0.0710	0.0014	442.0	8.2
16CL225-07	900	706	1.27	0.0556	0.0003	0.5732	0.0124	0.0748	0.0015	465.0	9.3
16CL225-08	163	434	0.38	0.0602	0.0010	0.6222	0.0210	0.0748	0.0017	465.1	10.1
16CL225-09	406	840	0.48	0.0562	0.0004	0.5535	0.0104	0.0715	0.0012	444.9	7.5
16CL225-10	692	1033	0.67	0.0587	0.0006	0.6048	0.0141	0.0748	0.0019	464.9	11.6
16CL225-11	200	365	0.55	0.0594	0.0045	0.6131	0.0663	0.0740	0.0027	460.5	16.4
16CL225-12	667	1323	0.50	0.0566	0.0004	0.5764	0.0133	0.0738	0.0016	459.3	9.5
16CL225-13	742	894	0.83	0.0584	0.0010	0.5928	0.0081	0.0738	0.0016	458.9	9.9
16CL225-14	587	1148	0.51	0.0585	0.0023	0.5818	0.0372	0.0718	0.0018	447.2	10.6
16CL225-18	435	858	0.51	0.0553	0.0004	0.5674	0.0096	0.0744	0.0011	462.6	6.7
16CL225-19	886	1486	0.60	0.0564	0.0004	0.5603	0.0074	0.0721	0.0009	448.6	5.5
16CL225-20	535	837	0.64	0.0572	0.0006	0.5723	0.0126	0.0726	0.0013	451.5	7.6
16CL225-21	379	837	0.45	0.0559	0.0004	0.5465	0.0096	0.0709	0.0013	441.3	7.9
16CL225-22	342	490	0.70	0.0577	0.0006	0.5885	0.0240	0.0739	0.0029	459.5	17.3
16CL225-23	705	990	0.71	0.0568	0.0004	0.5785	0.0084	0.0738	0.0010	459.2	5.8
16CL225-25	754	1232	0.61	0.0581	0.0007	0.6014	0.0298	0.0749	0.0032	465.3	19.1
16CL225-26	359	593	0.61	0.0562	0.0003	0.5497	0.0140	0.0710	0.0018	441.9	10.7
16CL230-01	444	639	0.70	0.0648	0.0015	0.6630	0.0313	0.0739	0.0022	459.7	13.1
16CL230-02	378	698	0.54	0.0552	0.0003	0.5504	0.0113	0.0723	0.0015	449.7	9.0
16CL230-04	229	518	0.44	0.0577	0.0004	0.5780	0.0094	0.0727	0.0012	452.3	7.4
16CL230-05	422	732	0.58	0.0572	0.0004	0.5637	0.0107	0.0715	0.0014	445.0	8.3
16CL230-06	411	758	0.54	0.0564	0.0004	0.5572	0.0104	0.0717	0.0013	446.2	7.9
16CL230-07	548	858	0.64	0.0564	0.0004	0.5689	0.0100	0.0731	0.0014	455.1	8.5
16CL230-09	499	669	0.75	0.0554	0.0005	0.5523	0.0082	0.0722	0.0012	449.6	7.2
16CL230-11	293	517	0.57	0.0564	0.0010	0.5719	0.0139	0.0734	0.0011	456.7	6.5
16CL230-12	316	385	0.82	0.0574	0.0008	0.5811	0.0109	0.0734	0.0010	456.5	6.0
16CL230-15	847	909	0.93	0.0598	0.0008	0.5873	0.0070	0.0712	0.0007	443.3	4.4
16CL230-16	351	704	0.50	0.0567	0.0005	0.5740	0.0063	0.0735	0.0009	456.9	5.4
16CL230-18	416	475	0.87	0.0548	0.0004	0.5518	0.0140	0.0731	0.0018	454.6	11.0
16CL230-19	539	476	1.13	0.0630	0.0008	0.6306	0.0178	0.0725	0.0016	451.3	9.6
16CL230-23	470	547	0.86	0.0555	0.0003	0.5460	0.0080	0.0714	0.0011	444.6	6.5
16CL230-24	431	756	0.57	0.0554	0.0003	0.5529	0.0084	0.0724	0.0011	450.7	6.6
16CL230-25	716	967	0.74	0.0565	0.0005	0.5679	0.0096	0.0729	0.0014	453.4	8.2

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表 3 二长花岗岩锆石LA-ICP-MS Hf同位素分析结果

Table 3. LA-ICP-MS zircon Hf isotopic analyses for the samples from the monzogranite

样品测试点	年龄(Ma)	¹⁷⁶Yb/ ¹⁷⁷Hf	2σ	¹⁷⁶Lu/ ¹⁷⁷Hf	2σ	¹⁷⁶Hf/ ¹⁷⁷Hf	2σ	ε_Hf(t)	T_DM1 (Ma)	T_DM2 (Ma)	f_Lu/Hf
16CL225-01	446.4	0.023356	0.000135	0.000758	0.000003	0.282697	0.000013	6.97	781	984	-0.98
16CL225-02	460.5	0.037430	0.001265	0.001204	0.000037	0.282689	0.000014	6.86	801	1002	-0.96
16CL225-03	451.5	0.030057	0.000374	0.000973	0.000010	0.282701	0.000014	7.15	780	976	-0.97
16CL225-04	442.0	0.049730	0.000411	0.001621	0.000013	0.282709	0.000015	7.04	782	976	-0.95
16CL225-07	465.0	0.075396	0.001801	0.002377	0.000055	0.282727	0.000018	7.92	772	938	-0.93
16CL225-08	465.1	0.040287	0.000431	0.001337	0.000014	0.282688	0.000015	6.87	806	1005	-0.96
16CL225-09	444.9	0.024452	0.000139	0.000799	0.000004	0.282680	0.000012	6.30	806	1026	-0.98
16CL225-10	464.9	0.062159	0.001107	0.002009	0.000033	0.282727	0.000015	8.05	764	930	-0.94
16CL225-11	460.5	0.020878	0.000573	0.000721	0.000016	0.282696	0.000013	7.22	782	979	-0.98
16CL225-12	459.3	0.081491	0.001226	0.002664	0.000029	0.282692	0.000017	6.47	830	1026	-0.92
16CL225-13	458.9	0.067293	0.001554	0.002242	0.000050	0.282710	0.000018	7.25	793	976	-0.93
16CL225-14	447.2	0.063321	0.000959	0.001881	0.000035	0.282702	0.000017	6.83	797	993	-0.94
16CL225-18	462.6	0.041836	0.000203	0.001290	0.000003	0.282748	0.000014	8.94	720	871	-0.96
16CL225-19	448.6	0.049673	0.000793	0.001566	0.000023	0.282704	0.000015	7.00	788	984	-0.95
16CL225-20	451.5	0.025792	0.000324	0.000793	0.000009	0.282689	0.000015	6.78	793	1000	-0.98
16CL225-21	441.3	0.052188	0.000394	0.001532	0.000011	0.282729	0.000017	7.75	752	930	-0.95
16CL225-22	459.5	0.065883	0.001637	0.002081	0.000055	0.282660	0.000016	5.52	863	1086	-0.94
16CL225-23	459.2	0.035430	0.001110	0.001100	0.000030	0.282686	0.000015	6.73	804	1009	-0.97
16CL225-25	465.3	0.042295	0.002500	0.001279	0.000066	0.282699	0.000016	7.27	790	980	-0.96
16CL225-26	441.9	0.080906	0.003871	0.002437	0.000123	0.282700	0.000015	6.46	814	1013	-0.93
16CL230-01	459.7	0.065292	0.001400	0.002075	0.000025	0.282807	0.000019	10.75	649	753	-0.94
16CL230-02	449.7	0.042051	0.000496	0.001321	0.000009	0.282684	0.000015	6.41	811	1022	-0.96
16CL230-04	452.3	0.035893	0.001511	0.001165	0.000049	0.282709	0.000014	7.38	773	962	-0.96
16CL230-05	445.0	0.036728	0.000348	0.001134	0.000006	0.282703	0.000014	7.02	781	979	-0.97
16CL230-06	446.2	0.032393	0.000238	0.001035	0.000005	0.282671	0.000016	5.96	823	1048	-0.97
16CL230-07	455.1	0.036569	0.000402	0.001139	0.000004	0.282675	0.000015	6.26	820	1036	-0.97
16CL230-09	449.6	0.086300	0.001620	0.002675	0.000066	0.282747	0.000020	8.21	750	907	-0.92
16CL230-11	456.7	0.037098	0.000330	0.001212	0.000003	0.282708	0.000018	7.44	774	962	-0.96
16CL230-12	456.5	0.036127	0.000435	0.001159	0.000018	0.282699	0.000016	7.11	787	983	-0.97
16CL230-15	443.3	0.065600	0.001673	0.001995	0.000041	0.282737	0.000017	7.94	750	920	-0.94
16CL230-16	456.9	0.038908	0.000411	0.001209	0.000014	0.282665	0.000016	5.90	837	1060	-0.96
16CL230-18	454.6	0.042958	0.001031	0.001380	0.000021	0.282754	0.000016	8.96	713	863	-0.96
16CL230-19	451.3	0.105026	0.001036	0.003142	0.000031	0.282694	0.000023	6.24	838	1034	-0.91
16CL230-23	444.6	0.020077	0.000253	0.000640	0.000005	0.282695	0.000014	6.88	781	988	-0.98
16CL230-24	450.7	0.030514	0.000580	0.000986	0.000021	0.282660	0.000014	5.67	838	1070	-0.97
16CL230-25	453.4	0.037458	0.000534	0.001201	0.000015	0.282717	0.000016	7.68	762	944	-0.96

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