桂北新寨强过铝质花岗岩的岩石成因及其构造意义——来自年代学、地球化学及Sr-Nd-Hf同位素的制约

贾小辉; 王晓地; 杨文强

桂北新寨强过铝质花岗岩的岩石成因及其构造意义——来自年代学、地球化学及Sr-Nd-Hf同位素的制约

1.
中国地质调查局武汉地质调查中心, 湖北武汉 430223

2.
中国地质调查局花岗岩成岩成矿地质研究中心, 湖北武汉 430223

基金项目:
国家自然科学基金项目《粤北罗岗钾玄质侵入岩的岩石成因及其动力学意义》（批准号：41302046）、中国地质调查局项目《南岭关键地区区域地质调查》（编号：12120113063600）和《国家地质数据库建设与整合》（编号：1212011220512）

详细信息

作者简介: 贾小辉(1980-), 男, 硕士, 助理研究员, 岩石地球化学专业。E-mail:jxh1226@126.com

通讯作者: 王晓地(1974-), 男, 博士, 高级工程师, 从事岩石学和矿床学研究。E-mail:178372234@qq.com

中图分类号: P534.42;P588.12⁺1;P597

收稿日期: 2016-09-18

修回日期: 2017-03-16

刊出日期: 2017-05-25

Constraints of geochemistry, geochronology and Sr-Nd-Hf isotopes on the Xinzhai peralu-minous granite in northern Guangxi:implications for petrogenesis and tectonic significance

1.
Wuhan Center of Geological Survey, CGS, Wuhan 430223, Hubei, China

2.
Research Center for Petrogenesis and Mineralization of Granitoid Rocks, CGS, Wuhan 430223, Hubei, China

More Information

Corresponding author: WANG Xiaodi, 178372234@qq.com

Received Date: 18 September 2016

Revised Date: 16 March 2017

Publish Date: 25 May 2017

摘要

摘要:
LA-ICP-MS锆石U-Pb定年结果显示，桂北新寨花岗岩形成于中奥陶世（465±2Ma）。该花岗岩的地球化学特征表现为化学成分较均一，具有高硅（SiO₂=68.54%~74.57%）、富碱（K₂O+Na₂O=7.61%~8.31%）、更富钾（K₂O/Na₂O=1.77~2.35）、强过铝质（A/CNK=1.09~2.39）和富集大离子亲石元素而亏损高场强元素等特征，属于S型花岗岩。新寨花岗岩具有比较均一的Sr、Nd同位素组成（I_Sr=0.71137~0.71328，ε _Nd（t）=-7.89~-7.26）。锆石Hf同位素组成为：（¹⁷⁶Hf/¹⁷⁷Hf）_i=0.28232~0.28252，ε_Hf（t）=-6.18~+0.61，Hf同位素两阶段模式年龄T_DM2变化于1.67~2.11Ga之间。元素及Nd-Sr-Hf同位素分析结果显示，新寨花岗岩可能源自古元古代地壳变质泥岩的部分熔融，在成岩过程中有少量幔源组分的参与。新寨S型花岗岩可能是广西运动第二幕在桂北地区的岩石学响应，为早古生代构造-岩浆群事件的建立提供了新证据。
- 中奥陶世 /
- S型花岗岩 /
- Sr-Nd-Hf同位素 /
- 广西运动 /
- 桂北
Abstract:
LA-ICP-MS zircon U-Pb dating shows that the Xinzhai granites, emplaced in northern Guangxi, were generated in Mid-dle Ordovician (465±2Ma).These granites are characterized by uniform silicon content (SiO₂=68.54%~4.57%), enrichment of alkali val-ues and considerable enrichment of K values (K₂O+Na₂O=7.61%~8.31%, K₂O/Na₂O=1.77~2.35), concentration of peraluminous (A/CNK=1.09~2.39) and high large ion lithophile elements (LILE)(e.g., Rb, K, Th) but relative depletion of high field-strength el-ements (HFSE)(e.g., Nb, Ta, P, Ti) and Sr.They belong to S-type granite.Granitic samples have homogeneous Sr-Nd isotope compositions (I_Sr=0.71137~0.71328, ε _Nd (t)=-7.89~-7.26).Zircon Hf isotope compositions of the Xinzhai granites have relatively wide ranges (¹⁷⁶Hf/¹⁷⁷Hf=0.28232~0.28252, ε_Hf(t)=-6.18~+0.61, T_DM2=1.67~2.11Ga).The authors hold that the Xinzhai granites were likely generated by partial melting of Paleoproterozoic metapelite, with the addition of small amounts of mafic magma mantle-derived material.The Xinzhai S-type granites might have been the petrological response to the second activity of the Kwangsian orogen in northern Guangxi, which provided new evidence for the establishment of the Early Paleozoic tectonic-magma events in South China.
- Middle Ordovician /
- S-type granite /
- Sr-Nd-Hf isotope composition /
- Kwangsian orogen /
- northern Guangxi

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图 1 新寨侵入体地质简图（a）和华南早古生代花岗岩分布简图（b）

Figure 1.

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图 2 新寨花岗岩锆石U-Pb年龄谐和图（a）和加权平均年龄图（b）

Figure 2.

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图 3 SiO₂-K₂O图(a)^[28]和A/CNK-A/NK图（b）（引文数据据参考文献[7, 14, 29-42]）

Figure 3.

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图 4 新寨、南岭地区、武夷—云开地区早古生代花岗岩稀土元素分布模式(a、c、e)和原始地幔标准化微量元素蛛网图(b、d、f)

Figure 4.

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图 5 新寨侵入岩(⁸⁷Sr/⁸⁶Sr)_i-ε _Nd(t)（a）和t-ε _Nd(t))图解（b）（图例同图 3）

Figure 5.

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图 6 新寨花岗岩锆石的ε _Hf(t)(a)和T_DM2频谱图(b)

Figure 6.

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图 7 新寨花岗岩Al₂O₃/TiO₂-CaO/Na₂O（a），Rb/SrRb/Ba（b）和CaO/（MgO+TFeO）-Al₂O₃/（MgO+TFeO）（c）图解

Figure 7.

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图 8 新寨花岗岩（Yb+Ta）-Rb（a）和Y-Nb图解（b）^[54]

Figure 8.

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表 1 新寨花岗岩LA-ICP-MS锆石U-Th-Pb同位素分析数据

Table 1. LA-ICP-MS U-Th-Pb isotopic data for zircons of the Xinzhai granites

点号	Pb	Th	U	比值（经普通铅校正）						年龄（经普通铅校正）/Ma
点号	/10^-6			²⁰⁷Pb/²⁰⁶Pb	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ	²⁰⁷Pb/²⁰⁶Pb	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ
1	340	1852	3872	0.05193	0.00073	0.5387	0.0073	0.07484	0.00055	282	27	438	5	465	3
2	314	1485	3695	0.04815	0.00062	0.5014	0.0067	0.07502	0.0005	107	28	413	5	466	3
3	279	1304	3243	0.05273	0.00101	0.5520	0.0138	0.07484	0.00067	317	54	446	9	465	4
4	218	983	2585	0.04956	0.00074	0.5187	0.0074	0.07546	0.00035	174	32	424	5	469	2
5	180	696	2182	0.04983	0.00081	0.5184	0.0084	0.07500	0.00038	187	37	424	6	466	2
6	251	1809	2752	0.05398	0.00097	0.5621	0.0099	0.07515	0.00054	370	37	453	6	467	3
7	367	1511	4445	0.05268	0.00074	0.5448	0.0077	0.07464	0.00051	315	29	442	5	464	3
8	307	1709	3336	0.05406	0.00077	0.5684	0.0087	0.07580	0.00054	373	31	457	6	471	3
9	506	3225	6517	0.05389	0.00064	0.5140	0.0064	0.06884	0.00052	366	23	421	4	429	3
10	254	1070	3089	0.05584	0.00083	0.5800	0.0078	0.07506	0.00057	446	25	464	5	467	3
11	431	2850	4939	0.05645	0.00074	0.5833	0.0073	0.07472	0.00062	470	21	467	5	465	4
12	335	1456	3850	0.05733	0.00095	0.6010	0.0099	0.07574	0.00065	504	32	478	6	471	4
13	448	2762	5309	0.05446	0.00078	0.5646	0.0081	0.07499	0.00067	390	26	455	5	466	4
14	397	3076	4596	0.05262	0.00066	0.5448	0.0068	0.07472	0.00035	313	27	442	4	465	2
15	436	3203	5232	0.05188	0.00063	0.5262	0.0064	0.07320	0.00037	280	26	429	4	455	2
16	317	2249	3757	0.05144	0.00064	0.5232	0.0068	0.07346	0.00051	261	26	427	5	457	3
17	438	2426	5146	0.05038	0.00057	0.5234	0.0062	0.07501	0.00045	213	24	427	4	466	3
18	268	1250	3182	0.05094	0.00066	0.5272	0.0077	0.07470	0.00055	238	30	430	5	464	3

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表 2 新寨花岗岩锆石Lu-Hf同位素分析结果

Table 2. Lu-Hf isotopic analyses for zircons of the Xinzhai granites

点号	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	2σ	T/Ma	ε _Hf(t)	2σ	T_Hf1/Ga	T_Hf2/Ga
01	0.025163	0.000830	0.282463	0.000011	465	-0.95	0.4	1.11	1.78
02	0.027225	0.000853	0.282346	0.000013	466	-5.06	0.5	1.27	2.04
03	0.029851	0.000952	0.282370	0.000012	465	-4.27	0.4	1.24	1.99
04	0.040693	0.001246	0.282317	0.000014	469	-6.18	0.5	1.33	2.11
05	0.029434	0.000908	0.282359	0.000009	466	-4.63	0.3	1.26	2.02
06	0.054760	0.001624	0.282430	0.000014	467	-2.32	0.5	1.18	1.86
07	0.030690	0.000943	0.282388	0.000009	464	-3.66	0.3	1.22	1.95
08	0.036582	0.001166	0.282469	0.000011	471	-0.73	0.4	1.11	1.77
09	0.051495	0.001635	0.282528	0.000019	429	0.35	0.7	1.04	1.64
10	0.047695	0.001418	0.282391	0.000012	467	-3.64	0.4	1.23	1.94
11	0.044739	0.001420	0.282480	0.000014	465	-0.51	0.5	1.10	1.74
12	0.032905	0.001018	0.282385	0.000014	471	-3.65	0.5	1.23	1.96
13	0.042287	0.001289	0.282477	0.000013	466	-0.55	0.5	1.10	1.75
14	0.051338	0.001555	0.282513	0.000018	465	0.61	0.6	1.06	1.67
15	0.034169	0.001069	0.282458	0.000012	455	-1.42	0.4	1.12	1.79
16	0.048987	0.001475	0.282427	0.000014	457	-2.59	0.5	1.18	1.86
17	0.038565	0.001186	0.282391	0.000012	466	-3.58	0.4	1.22	1.94
18	0.022362	0.000739	0.282463	0.000011	464	-0.95	0.4	1.11	1.78

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表 3 新寨花岗岩主量和微量元素分析结果

Table 3. Chemical composition of the Xinzhai granites

元素	N38-1	N38-2	N38-3	N38-4	N38-5	N38-6
SiO₂	74.07	74.57	68.54	68.70	72.43	71.89
Al₂O₃	13.25	13.39	15.25	14.78	15.44	15.33
Fe₂O₃	0.30	0.50	1.18	1.49	1.02	2.11
FeO	1.57	1.49	2.55	2.29	1.30	0.97
CaO	0.95	0.17	0.42	0.97	0.18	0.07
MgO	0.62	0.41	1.63	1.52	0.88	0.87
k₂O	5.37	5.83	5.24	5.12	5.59	5.56
Na₂O	2.84	2.48	2.37	2.90	0.16	0.16
TiO₂	0.16	0.12	0.39	0.37	0.46	0.46
P₂O₅	0.04	0.02	0.09	0.09	0.12	0.04
MnO	0.03	0.02	0.07	0.06	0.02	0.04
总计	99.19	99.00	97.73	98.28	97.60	97.50
烧失量	0.62	0.83	1.96	1.45	2.25	2.37
Sc	3.34	3.26	9.16	9.66	11.4	8.55
V	21.4	16.9	59.3	61.7	75.6	71.6
Cr	15.7	9.19	27.1	33.2	41.9	39.4
Co	3.27	3.25	8.56	9.15	4.85	7.58
Ni	6.62	6.58	16.8	17.6	13.8	14.9
Ga	13.1	13.2	17.1	17.9	18.5	17.9
Rb	304	309	300	247	292	268
Sr	58.3	32.7	73.3	146	7.51	6.05
Y	26.2	19.7	33.4	30.1	31.2	20.1
Nb	11.1	11.6	12.8	12.4	14.8	14.4
Cs	15.8	18.2	29.4	16.1	36.7	27.4
Ba	469	604	962	702	1110	1083
La	34.5	31.5	31.3	38.4	32.1	38.6
Ce	64.1	56.2	66.9	62.5	65.6	72.8
Pr	6.73	6.2	6.96	8.27	7.95	8.96
Nd	23.1	21.2	27.0	30.5	29.9	35.2
Sm	4.13	3.73	5.44	5.90	6.42	6.28
Eu	0.49	0.42	0.97	0.99	0.96	1.03
Gd	3.44	2.89	4.95	5.14	5.31	4.58
Tb	0.65	0.52	0.88	0.93	1.00	0.80
Dy	4.01	3.22	5.56	5.07	5.75	4.25
Ho	0.84	0.63	1.10	1.04	1.10	0.71
Er	2.51	1.97	3.28	2.91	3.18	2.22
Tm	0.53	0.40	0.60	0.51	0.58	0.39
Yb	3.55	2.93	3.66	3.40	3.32	2.51
Lu	0.63	0.53	0.60	0.50	0.52	0.33
Ta	3.20	3.20	1.88	1.77	1.95	2.01
Pb	55.8	53.3	29.4	46.4	20.5	16.1
Th	33.4	43.4	27.6	32.6	31.3	31.2
U	8.82	10.0	7.62	10.1	6.28	8.24
Zr	134	156	196	197	244	197
Hf	5.74	6.59	6.31	5.89	7.46	5.98
注：主量元素单位为%，微量和稀土元素为10^-6

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表 4 新寨花岗岩Sr-Nd同位素分析结果

样品号	Sm /10^-6	Nd /10^-6	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	2σ	ε _Nd(t)	T_DM2/Ga	Rb /10^-6	Sr /10^-6	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr	2σ	(⁸⁷Sr/⁸⁶Sr)_i
N038-1	4.13	23.1	0.1088	0.511%	0.000004	-7.88	1.85	304	58.3	14.71	0.80984	0.000011	0.71137
N038-3	5.44	27	0.1226	0.51201	0.000007	-7.89	1.85	300	73.3	11.54	0.76544	0.000010	0.68815
N038-4	5.9	30.5	0.1177	0.51202	0.000006	-7.26	1.80	247	146	4.770	0.74523	0.000013	0.71328

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