大别造山带姚冲花岗岩岩石地球化学特征及其地质意义

刘清泉; 邵拥军; 陈昕梦; 张喆; 李永峰; 黄小喜

大别造山带姚冲花岗岩岩石地球化学特征及其地质意义

1.
中南大学资源与安全工程学院, 湖南长沙, 410083

2.
中南大学有色金属成矿预测教育部重点实验室, 湖南长沙 410083

3.
中南大学地球科学与信息物理学院, 湖南长沙 410083

4.
河南省有色金属地质矿产局第七地质大队, 河南郑州 450016

5.
河南省有色金属地质勘查总院, 河南郑州 450052

基金项目:
中国地质调查局项目《豫南大别山北麓地区钼多金属成矿规律及找矿方法研究》（编号：12120113091200）、湖南省国土资源科研项目《湖南浏阳-醴陵官庄金矿整装勘查区找矿勘查关键基础地质研究》（编号：2016-04）、中国地质调查局项目《湖南省花垣-凤凰铅锌矿整装勘查区关键基础地质研究》（编号：12120114052201）

详细信息

作者简介: 刘清泉 (1983-), 男, 博士后, 从事矿床学方面的研究。E-mail:liu_qingquan@126.com

通讯作者: 邵拥军 (1971-), 男, 教授, 博士生导师, 从事矿床学方面的研究。E-mail:shaoyongjun@126.com

中图分类号: P589.12⁺1

收稿日期: 2015-12-04

修回日期: 2016-12-12

刊出日期: 2017-03-25

Geochemistry of the Yaochong granite in Dabie orogenic belt and its geological implications

1.
School of Resources and Safety Engineering, Central South University, Changsha 410083, Hu'nan, China

2.
Key Laboratory of Nonferrous Metal Ore Forecast, Ministry of Education, Central South University, Changsha 410083, Hu'nan, China

3.
School of Geosciences and Infophysics, Central South University, Changsha 410083, Hu'nan, China

4.
He'nan Provincial Non-ferrous Metals Geological and Mineral Resources Bureau No.7 Geological Team, Zhengzhou 450016, He'nan, China

5.
He'nan Institute of Geological Exploration for Non-ferrous Metal, Zhengzhou 450052, He'nan, China

More Information

Corresponding author: SHAO Yongjun, shaoyongjun@126.com

Received Date: 04 December 2015

Revised Date: 12 December 2016

Publish Date: 25 March 2017

摘要

摘要:
姚冲岩体位于秦岭-大别山造山带上，岩体的主要岩性为黑云母花岗岩和花岗斑岩。岩石地球化学分析结果显示，姚冲岩体SiO₂含量为71.28%~77.24%，K₂O含量为3.81%~5.28%，Na₂O含量为3.76%~5.03%，Al₂O₃含量为11.61%~14.6%，具有高钾钙碱性和准铝质-过铝质 (A/CNK=0.96~1.03) 特征。岩石稀土元素总量较低 (11.82×10^-6~123.65×10^-6)，轻稀土元素相对富集，重稀土元素相对亏损，具有Eu负异常，岩体富集Rb、U、Hf和Y，亏损Ba、Nb、Ta和Ti，显示出I型花岗岩的特点。锆石Hf同位素分析结果表明，姚冲岩体的ε_Hf(t) 值为-30~-22.8，位于地幔演化线之下，t_DM2值变化于2.21~2.60Ga之间，指示其源于扬子板块北缘的古老地壳，其组成类似于扬子板块北缘TTG型岩浆岩。结合区域地质背景，姚冲岩体形成于扬子陆块与华北陆块碰撞造山后的陆内伸展环境，对应的地球动力学背景为晚侏罗世—早白垩世地壳从挤压收缩向区域性伸展的构造体制大转换过程。
- 大别山 /
- 姚冲 /
- 花岗岩 /
- 地球化学 /
- 地质意义
Abstract:
Located in the Qinling-Dabie orogenic belt, the Yaochong granite body mainly consists of biotite granite and granite porphyry. According to the geochemical analysis, Yaochong granites have the following data: SiO₂=71.28%~77.24%, K₂O=3.81%~5.28%, Na₂O=3.76%~5.03%, Al₂O₃=11.61%~14.6%, and A/CNK=0.96~1.03. The rocks are enriched in LREE, depleted in HREE with negative Eu anomalies, enriched in Rb, U, Hf, Y and depleted in Ba, Nb, Ta, Ti, which indicates that Yaochong granites belong to metaluminous to peraluminous, high-K calc-alkaline I-type granite. According to zircon Hf isotope analysis, the ε_Hf(t) values of the granite range from-30 to-22.8, lying below the depleted mantle line. The t_DM2 values range from 2.21Ga to 2.60Ga, which indicates that the granite resulted from the lower crust of Yangtze block. The components of the granite porphyry are similar to those of Neoproterozoic TTG magmatic rocks. Yaochong granites were emplaced after the major collisional period of the North China block and Yangtze block, in a post-collisional tectonic setting under the regional extension mechanism. The geodynamic setting was the transformation of the tectonic regime of the late Jurassic-Early Cretaceous period.
- Dabie /
- Yaochong /
- granite /
- geochemistry /
- geological implications

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图 1 大别造山带地质略图 (据参考文献[13]修改)

Figure 1.

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图 2 大别山北麓姚冲钼矿区地质略图 (据参考文献[6]修改)

Figure 2.

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图 3 花岗岩岩相学特征

Figure 3.

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图 4 姚冲花岗岩ANOR-Q′标准化矿物图解 (a, 据参考文献[19]) 和SiO₂-A/CNK图解 (b)(Q′=100×Q/(Q+Or+Ab+An)；ANOR=100×An/(Or+An))

Figure 4.

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图 5 姚冲花岗岩Harker图解

Figure 5.

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图 6 姚冲花岗岩原始地幔标准化微量元素蛛网图 (a) 和球粒陨石标准化稀土元素分布模式 (b)

Figure 6.

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图 7 姚冲花岗岩Rb-Y图解 (底图据参考文献[27])

Figure 7.

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图 8 姚冲花岗岩（Zr+Nb+Ce+Y）-(Na₂O+K₂O)/CaO图解（底图据参考文献[32]）

Figure 8.

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图 9 姚冲花岗岩100*(TFeO+MgO+TiO₂)/SiO₂-(Al₂O₃+CaO)/(Na₂O+K₂O+TFeO) 图解（底图据参考文献[33]）

Figure 9.

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图 10 姚冲花岗岩造岩矿物结晶分异判别图解（底图据参考文献[35]）

Figure 10.

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图 11 姚冲花岗岩副矿物结晶分异作用过程判别图解（磷灰石的分配系数据参考文献[36]；锆石的分配系数据参考文献[37]；褐帘石的分配系数据参考文献[38]；独居石的分配系数据参考文献[39]）

Figure 11.

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图 12 姚冲钼矿区花岗岩锆石t-ε_Hf(t) 图（亏损地幔演化线据参考文献[43]；北大别片麻岩据参考文献[44]，太古宙崆岭片麻岩和混合岩及古元古代崆岭花岗岩据参考文献[45-47]）

Figure 12.

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表 1 姚冲矿区花岗岩主量、微量和稀土元素分析结果

Table 1. Major, trace and rare earth elements composition of Yaochong granites

样品号岩性	ZK0403-1	ZK0403-2	ZK0403-4	ZK0403-8	ZK0403-19	ZK0403-16	ZK0403-27	ZK0403-30	ZK0403-33	ZK0403-38
样品号岩性	黑云母花岗岩					花岗斑岩
SiO₂	76.64	77.24	71.28	72.41	72.61	76.15	75.35	75.01	75.49	74.70
TiO₂	0.17	0.20	0.20	0.19	0.21	0.04	0.05	0.04	0.04	0.05
Al₂O₃	11.97	11.61	14.60	14.34	13.81	13.00	13.67	13.41	13.41	13.87
Fe₂O₃	1.09	1.17	1.22	1.08	1.25	0.31	0.42	0.51	0.57	0.54
FeO	0.39	0.48	0.43	0.41	0.49	0.46	0.30	0.46	0.22	0.33
MnO	0.03	0.04	0.03	0.03	0.05	0.00	0.02	0.01	0.03	0.03
MgO	0.23	0.32	0.27	0.38	0.45	0.25	0.10	0.16	0.07	0.08
CaO	0.64	0.73	1.15	0.99	1.07	0.55	0.71	0.77	0.77	0.58
Na2O	3.89	3.76	4.54	4.57	4.32	4.53	5.03	4.83	4.71	4.70
K2O	4.12	3.98	5.28	4.57	4.57	4.23	3.81	4.13	4.14	4.39
P2O5	0.04	0.05	0.07	0.06	0.05	0.02	0.01	0.02	0.01	0.03
LOI	0.71	0.62	1.08	0.94	1.10	0.48	0.53	0.68	0.49	0.78
Total	99.92	100.20	100.16	99.99	99.99	100.01	99.99	100.02	99.96	100.08
TFeO	1.37	1.53	1.38	1.53	1.61	0.74	0.68	0.92	0.74	0.82
A/CNK	1.00	0.98	1.00	0.96	0.99	1.00	1.00	0.97	0.98	1.03
ANK	1.10	1.11	1.15	1.11	1.15	1.08	1.10	1.08	1.10	1.11
Mg#	23.1	27.0	32.6	24.0	33.3	37.4	20.2	23.3	14.7	15.3
DI	94	94	92	93	92	95	96	95	95	95
Q	36.65	38.13	22.24	25.84	27.22	32.02	29.89	29.46	30.62	29.25
An	2.93	3.06	3.90	4.57	4.85	2.62	3.47	2.73	3.24	2.81
Ab	33.19	31.96	38.80	39.06	36.98	38.51	42.79	41.15	40.08	40.06
Or	24.55	23.63	31.51	27.28	27.32	25.11	22.64	24.57	24.60	26.14
C	0.05	-	0.22	-	-	0.01	0.01	-	-	0.37
Sc	5.35	4.97	5.62	5.47	6.46	3.39	6.09	6.23	3.99	2.74
V	21.3	16.5	20.9	14.7	18.7	10.2	7.89	12.7	5.69	5.29
Cr	7.01	3.45	5.23	1.07	2.21	2.15	0.26	2.19	0.34	0.05
Co	1.14	1.16	1.10	1.13	1.01	0.22	0.12	0.45	0.23	0.15
Ni	3.90	2.87	2.56	1.50	2.22	3.70	0.69	1.84	0.38	0.10
Ga	20.1	21.1	26.5	24.6	24	20.5	22.3	21.2	25.7	20
Rb	191	181	216	224	233	173	247	234	307	245
Sr	270	231	231	274	184	79.4	35.8	52.3	43.1	118
Y	4.56	5.44	5.86	5.83	5.76	4.54	5.89	6.18	3.9	2.16
Zr	116	134	143	136	175	67.6	72.1	70.9	60.6	44
Nb	17.5	19.7	18.2	15.3	17.1	21	21.5	23.6	20.8	10.9
Cs	2.45	2.13	2.7	2.5	2.72	1.63	4.2	10.9	2.71	2.41
Ba	642	818	1033	1053	840	107	76.5	63.7	65.9	82.1
La	19.6	28.1	30.9	32	33	6.03	6.94	6.67	5.17	3.43
Ce	35.9	48.6	55.8	54.8	56.6	6.03	6.94	6.67	5.17	3.43
Pr	3.57	5.26	5.72	6.03	5.93	1.02	1.21	1.16	1.19	0.73
Nd	12.9	18.6	20.4	21.6	20.3	2.99	3.53	3.53	4.2	2.56
Sm	1.87	2.81	2.99	3.30	2.74	0.47	0.48	0.53	0.76	0.43
Eu	0.47	0.54	0.59	0.68	0.63	0.09	0.09	0.10	0.10	0.12
Gd	1.43	1.66	1.99	2.14	1.70	0.34	0.58	0.65	0.48	0.47
Tb	0.18	0.28	0.24	0.30	0.20	0.05	0.10	0.08	0.10	0.07
Dy	0.71	1.05	1.10	1.14	0.74	0.45	0.65	0.58	0.41	0.15
Ho	0.20	0.16	0.19	0.21	0.16	0.11	0.12	0.15	0.09	0.06
Er	0.33	0.44	0.41	0.53	0.42	0.44	0.45	0.42	0.20	0.09
Tm	0.08	0.11	0.09	0.08	0.06	0.10	0.11	0.08	0.03	0.02
Yb	0.81	0.49	0.74	0.70	0.49	0.65	0.90	0.96	0.37	0.23
Lu	0.09	0.09	0.14	0.14	0.13	0.13	0.18	0.13	0.06	0.04
Hf	5.51	3.8	5.67	4.68	5.73	6.03	5.06	6.05	4.76	2.86
Ta	1.19	1.17	1.34	0.97	0.76	1.75	1.46	1.79	1.39	0.77
Pb	46.3	38.8	43.6	42.9	39	34.2	63.8	75.7	102	73.9
Th	15.2	18.3	16.3	14.9	15.6	26.8	28.5	24.8	21.9	8.46
U	7.26	9.33	7.5	7.02	4.55	22.4	24.7	24.9	28.9	12.5
Nb/Ta	14.71	16.84	13.58	15.85	22.56	12.00	14.73	13.18	14.96	14.23
Zr/Hf	21.05	35.26	25.22	29.06	30.54	11.21	14.25	11.72	12.73	15.38
∑REE	78.13	108.20	121.30	123.65	123.10	18.91	22.28	21.71	18.34	11.82
LREE/HREE	19.43	24.24	23.77	22.62	30.55	7.31	6.22	6.11	9.51	9.55
(La/Yb)_N	17.45	40.90	29.97	32.85	48.33	6.64	5.51	4.99	10.08	10.80
δEu=Eu/Eu^*	0.84	0.71	0.70	0.74	0.83	0.66	0.53	0.52	0.49	0.84
T_Zr/℃	804	816	820	811	838	757	762	759	747	723
注： N=球粒陨石标准化，标准化值据参考文献[20]； A/CNK=molarAl/(Ca+Na+K)； A/NK=molarAl/( Na+K)； Mg^#=100∗molarMg/(Mg+TFe²⁺)； δEu=Eu/Eu^∗=2Eu_N/(Sm_N+Gd_N)； T_Zr=12900/[2.95+0.85M+ln(496000/Zr_melt)]， M=(Na+K+2Ca)/(Al∗Si)， Zr_melt为锆含量^[21]；主量元素含量单位为%，微量和稀土元素含量为 10^-6

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表 2 姚冲花岗岩锆石Hf同位素组成

Table 2. Zircon Hf isotope compositions of Yaochong granite

测试点	t/Ma	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	2σ	ε (t)	t_DM1/Ma	t_DM2/Ma	f_Lu/Hf
ZK0403-8-1	137	0.020240	0.001064	0.282062	0.000020	-25.1	1677	2336	-0.97
ZK0403-8-4	138	0.013480	0.000517	0.282011	0.000010	-26.9	1724	2435	-0.98
ZK0403-8-4-1	138	0.014891	0.000564	0.281997	0.000010	-27.4	1744	2462	-0.98
ZK0403-8-5	136	0.019261	0.000951	0.282056	0.000016	-25.3	1680	2347	-0.97
ZK0403-8-8	142	0.016409	0.000697	0.282009	0.000012	-27.0	1735	2439	-0.98
ZK0403-8-12	141	0.024508	0.001021	0.281926	0.000144	-29.9	1864	2598	-0.97
ZK0403-8-13	137	0.016821	0.000753	0.282048	0.000016	-25.6	1683	2363	-0.98
ZK0403-8-15	138	0.014251	0.000667	0.281923	0.000062	-30.0	1852	2606	-0.98
ZK0403-8-19	136	0.007879	0.000383	0.282039	0.000015	-25.9	1680	2381	-0.99
ZK0403-8-20	142	0.018767	0.000897	0.282051	0.000010	-25.5	1685	2357	-0.97
ZK0403-8-22	137	0.014897	0.000691	0.282127	0.000026	-22.8	1572	2212	-0.98
ZK0403-8-23	137	0.018694	0.000855	0.282050	0.000014	-25.5	1686	2361	-0.97
ZK0403-8-24	141	0.022524	0.001021	0.282081	0.000018	-24.4	1649	2299	-0.97
ZK0403-16-1	140	0.015684	0.000730	0.282068	0.000014	-24.9	1655	2325	-0.98
ZK0403-16-4	141	0.018214	0.000887	0.282106	0.000023	-23.6	1610	2252	-0.97
ZK0403-16-7	139	0.023037	0.001115	0.282103	0.000052	-23.7	1623	2257	-0.97
ZK0403-16-8	137	0.018405	0.000888	0.282076	0.000013	-24.6	1651	2310	-0.97
ZK0403-16-10	138	0.025669	0.001237	0.282065	0.000015	-25.0	1681	2330	-0.96
ZK0403-16-11	142	0.018295	0.000806	0.282061	0.000017	-25.1	1667	2338	-0.98
ZK0403-16-12	137	0.020539	0.000951	0.282067	0.000015	-24.9	1666	2327	-0.97
ZK0403-16-13	137	0.018980	0.000999	0.282086	0.000014	-24.3	1642	2291	-0.97
ZK0403-16-14	140	0.014076	0.000607	0.282022	0.000011	-26.5	1713	2414	-0.98
ZK0403-16-17	137	0.020442	0.000972	0.282081	0.000021	-24.4	1647	2299	-0.97
ZK0403-16-20	137	0.014623	0.000627	0.282037	0.000014	-26.0	1694	2386	-0.98
ZK0403-16-21	135	0.018464	0.000887	0.282098	0.000013	-23.8	1620	2267	-0.97
ZK0403-16-22	138	0.020463	0.000977	0.282095	0.000017	-23.9	1628	2272	-0.97
ZK0403-16-23	141	0.016615	0.000836	0.282096	0.000015	-23.9	1621	2271	-0.97
ZK0403-16-25	142	0.015171	0.000650	0.282056	0.000016	-25.3	1668	2348	-0.98
注：ε_Hf(t)=10000×﹛[(¹⁷⁶Hf/¹⁷⁷Hf)_S-(¹⁷⁶Lu/¹⁷⁷Hf)_S×(e^λt-1)]/[ (¹⁷⁶Hf/¹⁷⁷Hf)_CHUR.0-(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR×(e^λt-1)]-1﹜；t_DM1=1/λ×ln﹛1+[(¹⁷⁶Hf/¹⁷⁷Hf)_S-(¹⁷⁶Hf/¹⁷⁷Hf)_DM]/[ (¹⁷⁶Lu/¹⁷⁷Hf)_S-(¹⁷⁶Lu/¹⁷⁷Hf)_DM]﹜；t_DM2=1/λ× ln﹛1+[(¹⁷⁶Hf/¹⁷⁷Hf)_S.t-(¹⁷⁶Hf/¹⁷⁷Hf)_DM.t]/[ (¹⁷⁶Lu/¹⁷⁷Hf)_c-(¹⁷⁶Lu/¹⁷⁷Hf)_DM]﹜+t；(¹⁷⁶Hf/¹⁷⁷Hf)_S和 (¹⁷⁶Lu/¹⁷⁷Hf)_S为样品测定值；(¹⁷⁶Hf/¹⁷⁷Hf)_CHUR.0=0.282772，(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR=0.0332，(¹⁷⁶Hf/¹⁷⁷Hf)_DM=0.28325, (¹⁷⁶Lu/¹⁷⁷Hf)_DM=0.0384^[24-25]；λ=1.867×10-11/a^[26]；(¹⁷⁶Lu/¹⁷⁷Hf) c=0.015；t为锆石结晶时间

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