西秦岭宕昌–舟曲地区晚三叠世埃达克质花岗岩年代学、地球化学特征及其构造意义

张梓尧; 张义虎; 徐磊; 王怀涛

doi:10.12401/j.nwg.2023013

西秦岭宕昌–舟曲地区晚三叠世埃达克质花岗岩年代学、地球化学特征及其构造意义

1.
兰州文理学院，甘肃兰州　730000

2.
兰州大学地质科学与矿产资源学院，甘肃兰州　730000

3.
甘肃省地质调查院，甘肃兰州　730000

基金项目: 甘肃省级基础地质调查项目“甘肃省肃北县大一明镇–白头山地区1:5万区域地质矿产调查”（甘资字〔2023〕37号）和中国地质调查局项目“东天山昌吉–双沟山地区区域地质调查”（DD20190065）联合资助。

详细信息

作者简介: 张梓尧（1990−），女，讲师，研究方向为矿物学、岩石学与矿床学和科技类文献研究与翻译。E−mail：samanthas@qq.com

通讯作者: 徐磊（1986−），男，高级工程师，主要从事区域地质调查和矿产勘探研究工作。E−mail：397315452@qq.com。

中图分类号: P588.121；P597.3

收稿日期: 2022-12-10

修回日期: 2023-09-21

刊出日期: 2024-10-20

Geochronology, Geochemistry and Tectonic Significance of Late Triassic Adakite Granites in Tanchang-Zhouqu area of West Qinling

1.
Lanzhou University of Arts and Science, Lanzhou 730000, Gansu, China

2.
School of Earth Sciences, Lanzhou University, Lanzhou 730000, Gansu, China

3.
Geological Survey of Gansu Province, Lanzhou 730000, Gansu, China

More Information

Corresponding author: XU Lei, 397315452@qq.com

Received Date: 10 December 2022

Revised Date: 21 September 2023

Publish Date: 20 October 2024

摘要

摘要:
西秦岭造山带位于秦岭–大别造山带西段，其印支期花岗岩研究对认识中央造山带的构造演化具有十分重要的意义。笔者选择西秦岭宕昌–舟曲地区的燕麦层与憨班花岗岩体进行了岩相学、LA-ICP-MS锆石U-Pb年代学、地球化学的研究。结果表明，燕麦层的二长闪长岩、憨班的花岗闪长岩，具有高Al₂O₃、MgO，Mg^#＜45，富钠贫钾的特征，主体为亚碱性–碱性系列，准铝质–弱过铝质I型花岗岩，轻稀土高度富集，弱Eu负异常，富集Th、K、U等LILE；HFSE中强烈亏损Nb、Ta、P和Ti元素。锆石U-Pb同位素测年结果显示燕麦层与憨班岩体分别形成于（219.4±1.5）Ma和（222.1±1.9）Ma，其侵位时间为晚三叠世中期。综合地质、地球化学和年代学特征，研究区花岗岩体为后碰撞环境，可能形成于增厚地壳下部岩石圈地幔拆沉、软流圈上涌加热下地壳部分熔融的环境下。
- 花岗岩 /
- 晚三叠世 /
- 埃达克岩 /
- 后碰撞环境 /
- 西秦岭
Abstract:
The west Qinling orogenic belt is located in the west of Qinling-Dabie orogenic belt. The study of granites is of great significance for understanding the tectonic evolution of the central orogenic belt. In this paper, Petrography, LA-ICP-MS zircon U-Pb chronology and geochemistry of the Yanmaiceng and Hanban granitoids in the Tanchang-Zhouqu area of the Western Qinling Mountains were studied. The results show that the Yanmaiceng monzodiorite and HanBan granodiorite are characterized by high Al₂O₃, MgO, Mg^# < 45, rich in Na and poor in K. The main –granites are subalkaline–alkaline series, quasi-aluminous～weakly peraluminous I-type granites, which are highly enriched in LREE, weak negative Eu anomaly, and enriched in LILE such as Th, K, U. The elements of Nb, Ta, P and Ti in HFSE were strongly depleted. Zircon U-Pb isotopic dating shows that the Yanmaiceng and Hanban granitoid were formed at (219.4±1.5) Ma and (222.1±1.9) Ma, respectively, and emplaced in the middle of Late Triassic. According to the geological, geochemical and chronological characteristics, the granites in the study area are in a post-collision environment, which may have been formed in the crust thickening, and the lower lithospheric mantle detachment occurred, resulting in the upwelling and thickening of the asthenosphere and the partial melting of the lower crust.
- granite /
- late Triassic /
- adakite /
- post-collision Environment /
- West Qinling

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图 1 西秦岭造山带构造划分图及研究区地质图

Figure 1.

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图 2 燕麦层与憨班花岗岩照片

Figure 2.

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图 3 憨班与燕麦层花岗岩锆石CL图像

Figure 3.

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图 4 憨班（a）与燕麦层（b）锆石U-Pb年龄谐和图

Figure 4.

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图 5 宕昌花岗岩分类图解（部分数据引自刘明强，2012）

Figure 5.

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图 6 微量元素原始地幔标准化蛛网图（a）与稀土元素球粒陨石表转化分布型式图（b）

Figure 6.

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图 7 宕昌花岗岩哈克图解

Figure 7.

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图 8 Sr/Y-Y图解（a）、（La/Yb）_N-Yb_N图解（b）、Sr-Yb图解（c）（张旗等，2012）与（Dy/Yb）_N-（La/Yb）_N图解（d）（标准化数值据源自Sun等，1989）

Figure 8.

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图 9 宕昌花岗岩岩石Nb-Y判别图解（a）与Ta-Yb判别图解（b）（Pearce et al.，1984）

Figure 9.

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图 10 西秦岭220～215 Ma所处的转换拉伸构造复原图

Figure 10.

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表 2 花岗岩的主量 (%)、稀土和微量元素(10⁻⁶)

Table 2. Major (%) and trace elements (10⁻⁶) data for the granite in Tanchang

元素	YMC1	YMC2	HB1	HB2	HB3	HB4	RSG1	RSG2	RSG3
SiO₂	53.96	54.90	70.98	72.99	73.20	67.78	58.94	60.48	62.92
Al₂O₃	18.59	17.7	14.19	14.41	14.75	15.50	15.84	15.65	15.40
Fe₂O₃	1.54	2.96	1.32	0.28	0.20	0.61	1.51	1.36	0.63
FeO	6.40	5.14	1.85	1.67	0.78	2.02	5.12	4.50	4.93
CaO	6.76	6.38	1.74	1.23	1.51	2.56	5.00	3.82	3.11
MgO	3.35	3.48	0.80	0.25	0.25	1.10	3.34	2.84	2.27
K₂O	3.49	3.75	4.06	4.57	4.26	4.79	4.50	4.72	4.79
Na₂O	3.19	3.12	3.99	3.97	3.92	4.13	2.88	3.28	3.13
TiO₂	0.863	0.910	0.336	0.129	0.120	0.430	0.796	0.691	0.591
P₂O₅	0.409	0.336	0.131	0.038	0.053	0.200	0.293	0.236	0.188
MnO	0.119	0.124	0.057	0.027	0.021	0.059	0.114	0.103	0.089
LOI	0.24	0.25	0.07	0.06	0.20	0.20	0.79	1.48	1.09
Cr	36.00	40.50	62.70	8.71	2.97	25.90	87.80	49.00	35.80
Ni	14.80	14.90	11.50	2.57	22.10	22.00	12.20	16.20	10.20
Co	26.10	27.00	5.54	1.22	3.45	5.13	16.70	17.00	15.30
Li	35.9	31.8	166.0	68.9	95.6	70.5	39.5	31.8	41.0
Rb	23.7	37.5	193.0	288.0	191.0	180.0	69.1	41.8	31.0
Cs	4.43	3.96	24.10	1.84	19.80	10.70	10.20	6.17	8.95
Sr	794	779	292	198	224	912	557	472	333
Ba	868	751	724	768	846	1390	853	1182	1045
V	154.0	186.0	41.0	27.2	5.3	46.0	110.0	122.0	110.0
Sc	9.89	10.60	2.29	0.92	2.17	4.65	8.24	8.50	6.83
Nb	18.4	15.1	27.6	48.7	10.4	19.3	26.4	20.4	20.9
Ta	1.12	0.85	2.36	1.07	1.35	1.31	1.71	1.46	1.67
Zr	208.0	264.0	302.0	1270.0	84.9	282.0	350.0	251.0	215.0
Hf	5.11	6.02	8.38	28.10	2.71	6.43	8.60	6.46	5.91
Be	2.44	2.24	10.30	8.63	7.08	6.91	3.71	3.04	3.04
U	5.15	3.62	4.56	29.60	3.50	10.40	9.26	6.77	8.43
Th	14.60	12.80	17.70	49.90	8.63	26.33	28.10	21.10	20.80
La	54.3	48.6	57.6	17.6	17.1	80.8	76.2	57.3	49.0
Ce	103.0	91.4	106.0	33.2	32.6	152.0	142.0	106.0	88.0
Pr	11.20	10.20	10.80	3.62	3.75	16.90	14.00	10.80	8.95
Nd	47.60	43.90	43.50	15.00	13.20	59.10	55.20	43.10	35.50
Sm	8.28	7.84	7.32	3.18	2.98	10.00	9.14	7.23	6.08
Eu	2.17	2.00	1.58	0.69	0.73	2.38	1.86	1.57	1.44
Gd	6.62	6.27	5.73	2.54	2.36	7.38	7.60	6.05	5.07
Tb	0.86	0.84	0.68	0.33	0.30	0.91	0.98	0.78	0.67
Dy	4.25	4.22	2.97	1.43	1.46	4.32	5.00	3.94	3.37
Ho	0.79	0.78	0.50	0.21	0.24	0.76	0.96	0.74	0.64
Er	2.10	2.10	1.29	0.52	0.55	1.91	2.66	2.04	1.75
Tm	0.30	0.30	0.18	0.07	0.07	0.25	0.40	0.30	0.27
Yb	1.78	1.79	1.03	0.36	0.43	1.70	2.40	1.82	1.57
Lu	0.27	0.28	0.16	0.06	0.06	0.25	0.37	0.29	0.25
Y	18.50	18.30	12.20	5.44	6.96	21.60	23.50	18.20	15.40
ΣREE	262.02	238.82	251.54	84.25	82.79	352.60	342.27	260.16	217.96
LREE	226.55	203.94	226.80	73.29	70.36	313.56	298.40	226.00	188.97
ΣY	35.47	34.88	24.74	10.96	12.43	39.04	43.87	34.16	28.99
(La/Yb)_N	20.14	17.94	36.71	32.14	28.53	34.09	20.95	20.79	20.6
δEu	0.88	0.85	0.73	0.73	0.81	0.81	0.67	0.71	0.78
δCe	0.94	0.92	0.95	0.93	0.95	0.96	0.96	0.95	0.93
注：样品HB3和HB4数据引自刘明强，2012。

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表 1 宕昌花岗岩的LA-ICP-MS锆石U-Pb同位素分析结果

Table 1. LA-ICP-MS zircon U-Pb analytic for granite in Tanchang

分析号	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁸Pb/²³²Th	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁸Pb/²³²Th	1σ
YMC01	0.05250	0.00128	0.24796	0.00609	0.03421	0.00046	0.01144	0.00057	307.2	54.31	224.9	4.95	216.9	2.89	229.9	11.45
YMC02	0.05407	0.00132	0.25328	0.00625	0.03393	0.00046	0.01082	0.00052	373.7	54.04	229.2	5.06	215.1	2.88	217.6	10.40
YMC03	0.05432	0.00087	0.26164	0.00446	0.03489	0.00044	0.01356	0.00049	384.2	35.39	236.0	3.59	221.1	2.72	272.3	9.730
YMC04	0.05114	0.00092	0.24234	0.00456	0.03432	0.00044	0.01042	0.00037	247.3	40.87	220.3	3.73	217.5	2.72	209.6	7.330
YMC05	0.05105	0.00080	0.24077	0.00406	0.03415	0.00043	0.01121	0.00040	243.2	35.85	219.0	3.32	216.5	2.66	225.4	7.950
YMC06	0.05367	0.00142	0.25367	0.00673	0.03428	0.00048	0.00999	0.00048	357.2	58.62	229.6	5.45	217.3	2.99	200.9	9.670
YMC07	0.05249	0.00111	0.24831	0.00536	0.03431	0.00045	0.00944	0.00049	306.6	47.17	225.2	4.36	217.5	2.83	190.0	9.830
YMC08	0.05119	0.00079	0.24143	0.00403	0.03421	0.00043	0.01091	0.00040	249.6	35.28	219.6	3.30	216.8	2.67	219.4	8.020
YMC09	0.05313	0.00090	0.25656	0.00459	0.03503	0.00044	0.00986	0.00049	334.2	37.78	231.9	3.71	221.9	2.77	198.3	9.800
YMC10	0.04926	0.00115	0.23270	0.00550	0.03426	0.00046	0.01022	0.00037	160.3	53.57	212.4	4.53	217.2	2.86	205.4	7.490
YMC11	0.05208	0.00078	0.25146	0.00407	0.03502	0.00044	0.01127	0.00033	288.8	33.88	227.8	3.30	221.9	2.72	226.4	6.500
YMC12	0.05117	0.00088	0.24500	0.00445	0.03473	0.00044	0.01069	0.00047	248.3	39.30	222.5	3.63	220.1	2.76	215.0	9.470
YMC13	0.05059	0.00081	0.24347	0.00416	0.03491	0.00044	0.01057	0.00041	222.3	36.66	221.3	3.39	221.2	2.73	212.5	8.270
YMC14	0.04967	0.00098	0.23991	0.00486	0.03504	0.00046	0.01052	0.00035	179.5	45.20	218.3	3.98	222.0	2.84	211.6	6.940
YMC15	0.04999	0.00086	0.23375	0.00421	0.03392	0.00043	0.01078	0.00041	194.3	39.54	213.3	3.47	215.0	2.69	216.8	8.280
YMC16	0.04976	0.00104	0.24288	0.00524	0.03536	0.00046	0.01102	0.00061	183.6	48.18	220.8	4.28	224.0	2.87	221.5	12.13
YMC17	0.05158	0.00084	0.25216	0.00438	0.03546	0.00045	0.01099	0.00034	266.6	37.12	228.3	3.55	224.7	2.79	220.9	6.760
YMC18	0.05163	0.00110	0.25090	0.00542	0.03525	0.00047	0.01104	0.00045	269.0	48.02	227.3	4.40	223.3	2.91	222.0	9.060
HB01	0.05305	0.00189	0.25753	0.00906	0.03523	0.00054	0.01178	0.00074	331.0	78.97	232.7	7.31	223.2	3.36	236.7	14.74
HB02	0.05156	0.00090	0.25214	0.00461	0.03549	0.00045	0.01367	0.00063	266.0	39.57	228.3	3.74	224.8	2.80	274.4	12.66
HB03	0.07092	0.00113	0.35638	0.00600	0.03647	0.00046	0.02257	0.00091	955.1	32.40	309.5	4.49	230.9	2.88	451.1	18.00
HB04	0.10941	0.00144	2.55872	0.03701	0.16972	0.00213	0.07167	0.00195	1789.6	23.74	1288.9	10.56	1011	11.72	1399	36.70
HB05	0.05021	0.00119	0.24888	0.00599	0.03597	0.00048	0.01414	0.00062	204.9	54.29	225.7	4.87	227.8	3.00	283.8	12.31
HB06	0.04856	0.00088	0.23608	0.00446	0.03529	0.00045	0.01284	0.00063	126.4	42.18	215.2	3.67	223.6	2.80	257.8	12.50
HB07	0.05065	0.00081	0.24780	0.00422	0.03550	0.00044	0.01306	0.00040	225.1	36.59	224.8	3.43	224.9	2.76	262.2	7.900
HB08	0.07471	0.00135	0.54070	0.01013	0.05252	0.00069	0.01954	0.00111	1060.7	36.06	438.9	6.67	330.0	4.20	391.2	21.97
HB09	0.05145	0.00080	0.25447	0.00422	0.03589	0.00045	0.01216	0.00042	260.9	35.23	230.2	3.42	227.3	2.78	244.3	8.290
HB10	0.05057	0.00073	0.24586	0.00387	0.03528	0.00044	0.01097	0.00020	221.1	33.19	223.2	3.15	223.5	2.71	220.5	4.000
HB11	0.05114	0.00070	0.24033	0.00362	0.03410	0.00042	0.01041	0.00037	247.1	31.20	218.7	2.96	216.1	2.60	209.4	7.410
HB12	0.05246	0.00085	0.24971	0.00427	0.03453	0.00043	0.01137	0.00033	305.7	36.25	226.3	3.47	218.8	2.69	228.6	6.510
HB13	0.05077	0.00083	0.24463	0.00424	0.03496	0.00044	0.00986	0.00031	230.3	37.34	222.2	3.46	221.5	2.73	198.2	6.220
HB14	0.05269	0.00071	0.25301	0.00378	0.03483	0.00043	0.01094	0.00027	315.5	30.47	229.0	3.06	220.7	2.66	219.9	5.330
HB15	0.11535	0.00136	0.59237	0.00795	0.03725	0.00045	0.02215	0.00040	1885.4	21.13	472.4	5.07	235.8	2.83	442.7	7.840
HB16	0.05258	0.00076	0.25721	0.00404	0.03548	0.00044	0.01176	0.00029	310.7	32.50	232.4	3.26	224.7	2.73	236.3	5.840
HB17	0.05249	0.00081	0.24983	0.00415	0.03452	0.00043	0.01117	0.00029	306.8	34.89	226.4	3.37	218.8	2.68	224.6	5.720
HB18	0.05237	0.00063	0.25043	0.00343	0.03468	0.00042	0.01039	0.00016	301.5	27.08	226.9	2.78	219.8	2.61	208.9	3.170
HB19	0.05122	0.00071	0.24419	0.00373	0.03457	0.00042	0.01133	0.00033	250.7	31.68	221.8	3.04	219.1	2.64	227.7	6.540

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