武当隆起西段牌楼新元古代A<sub>1</sub>型花岗岩的发现及其地质意义

张维峰; 徐大良; 彭练红; 邓新; 刘浩; 金鑫镖; 谭靖

doi:10.3799/dqkx.2018.179

武当隆起西段牌楼新元古代A₁型花岗岩的发现及其地质意义

doi: 10.3799/dqkx.2018.179

张维峰^1,2,,
徐大良¹,
彭练红^1, ,,
邓新¹,
刘浩¹,
金鑫镖¹,
谭靖¹

1.
中国地质调查局武汉地质调查中心, 湖北武汉 430205
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 430205

基金项目:

中国地质调查局项目 DD20160030

详细信息

作者简介:
张维峰(1985-), 男, 助理研究员, 主要从事岩石、矿物、矿床等方面的研究

通讯作者:
彭练红

中图分类号: P581;P597
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出版历程
- 收稿日期: 2018-06-25
- 刊出日期: 2018-07-15

The Discovery and Geological Significance of the Neoproterozoic A₁-Type Granite in the Pailou Area, Wudang Uplift

1.
Wuhan Center of China Geological Survey, Wuhan 430205, China
2.
Research Center of Granitic Diagenesis and Mineralization, China Geological Survey, Wuhan 430205, China

摘要

摘要: 牌楼似斑状二长花岗岩出露于武当隆起的西部，是南秦岭地区新元古代岩浆活动的典型代表.锆石LA-ICP-MS年代学研究获得其成岩年龄为667.2±3.5 Ma.岩体Na₂O+K₂O含量和A/CNK分别介于8.31%~8.47%和0.89~0.94，显示出亚碱性、准铝质特征；同时样品富集大离子亲石元素Rb、K、U、Pb及高场强元素Nb、Ta，亏损Sr、P、Ti和重稀土元素，具有较高的Zr+Nb+Y+Ce含量以及10 000 Ga/Al、FeO^T/（FeO^T+MgO）比值，出现特征矿物铁韭闪石和富铁钠闪石，属于A₁型花岗岩.牌楼岩体ε_Hf（t）主要集中于-1.8~+1.5，来源于软流圈交代岩石圈地幔类似于OIB熔体，并伴随有一定的地壳混染作用.微量元素模拟显示，母岩浆在成岩之前发生了大规模的斜长石和辉石的分离结晶.综合区域研究资料、地质年代学、地球化学及同位素特征，结果表明武当隆起在新元古代成冰纪处于板片断裂的弧后伸展环境.
- 岩石成因 /
- A₁型花岗岩 /
- 板片断裂 /
- 新元古代 /
- 武当隆起 /
- 地球化学
Abstract: As a typical case of the Neoproterozoic magmatism in South Qinling, the Pailou porphyritic monzogranite exposed in the western margin of Wudang uplift. Zircon U-Pb dating on the granite yields an age of 667.2±3.5 Ma. The granite shows sub-alkaline and metaluminous affinities, with Na₂O+K₂O and A/CNK values ranging 8.31%-8.47% and 0.89-0.94, respectively. The monzogranite enriched in LILEs (i.e. Rb, K, U and Pb) and HFSEs (i.e. Nb and Ti), and depleted in Sr, P, Ti and HREE. Due to the high content of Zr+Nb+Y+Ce and ratios of 10 000 Ga/Al and FeO^T/(FeO^T+MgO), as well as characteristic minerals of hastingsite and ferropargasite, the Pailou monzogranite displaying A₁-type geochemical features. The zircon ε_Hf(t) values of the study rocks mainly vary from -1.8 to +1.5, indicating that the magma likely to have been sourced from mantle metasomatized by asthenosphere, OIB-like melts, with minor crustal assimilation. Based on modal calculations of trace elements, the fractional crystallization of plagioclase and pyroxene has been proposed during magmatic evolution. Integrating the data obtained from studies on geology, geochronology, geochemistry and isotopic compositions, we propose that the Pailou magmatism was the product of norogenic magmatism and formed in tectonic setting of a back-arc rift setting that probably developed in relation to slab tearing during continued slab rollback.
- petrogenesis /
- A₁-type granites /
- slab tearing /
- Neoproterozoic /
- Wudang uplift /
- geochemistry

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图 1 (a) 秦岭-桐柏-大别构造简图；(b)武当隆起大地构造位置；(c)牌楼岩体出露位置

a据吴元保和郑永飞(2013)；b据Ling et al.(2008)修编

Fig. 1. Geological sketch of the Qinling-Tongbai-Dabie orogenic belt (a); tectonic location of Wudang uplift (b); geographic location of Pailou granite (c)

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图 2 牌楼二长花岗岩手标本(a)及镜下特征(b~e)

b, d.为单偏光照片；c, e.分别为对应的正交偏光照片；Bt.黑云母；Hb.角闪石；Pl.斜长石；Qz.石英

Fig. 2. Hand specimen (a) and microscopic photos (b-e) of the Pailou monzogranite

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图 3 侵入岩TAS分类图解(a)；SiO₂-(K₂O+Na₂O-CaO)图解(b)；A/NK-A/CNK图解(c)；SiO₂-FeO^T/(FeO^T+MgO)图解(d)

图a据Wilson(2007)；图b据Frost et al.(2001)；图c据Maniar and Piccoli(1989)；图d据Frost et al.(2001)

Fig. 3. Total alkalis vs. silica diagram (a); SiO₂ vs. (K₂O+Na₂O) (b); A/NK vs. A/CNK diagram (c); the compositional range of the granitoids in the FeO^T/(FeO^T+MgO) vs. SiO₂ diagram (d)

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图 4 牌楼二长花岗岩球粒陨石标准化稀土元素配分模式(a)和原始地幔标准化微量元素蛛网图(b)

OIB、E-MORB、N-MORB数据来源于Sun and McDonough(1989)

Fig. 4. Chondrite-normalized REE patterns (a) and primitive mantle-normalized multi-element diagrams (b)

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图 5 牌楼二长花岗岩单颗粒锆石CL图像

Fig. 5. CL images of zircons from the Pailou monzogranite

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图 6 单颗粒锆石球粒陨石标准化稀土元素配分模式

岩浆锆石和热液锆石数据来源于Belousova et al.(2002)

Fig. 6. Chondrite-normalized REE patterns for the zircons

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图 7 牌楼二长花岗岩锆石U-Pb年龄谐和图及加权平均年龄

Fig. 7. U-Pb diagrams of concordia and weighted mean ages for zircons from the Pailou monzogranite

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图 8 牌楼岩体中角闪石成分分类图解

据Leake et al.(1997)修编

Fig. 8. Composition of amphibole from the Pailou monzogranite

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图 9 A型花岗岩判别图解

据Whalen et al.(1987)

Fig. 9. Discriminating diagram of A-type granite

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图 10 A₁型花岗岩判别图解

据Eby(1992)

Fig. 10. Discriminating diagram of A₁-type granite

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图 11 牌楼岩体锆石T-ε_Hf(t)图解

武当群、耀岭河组数据来源于Wang et al.(2013)；崆岭群、陡山沱组数据来源于Wang et al.(2016)

Fig. 11. T-ε_Hf(t) diagram of the zircons from the Pailou monzogranite

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图 12 矿物相分离结晶模拟(a)Sr-Ba；(b)Yb-Lu

分配系数来源于http://earthref.org/GERM/

Fig. 12. Modal calculations of trace elements (a) Sr-Ba, (b) Yb-Lu

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图 13 花岗岩类构造环境判别图

据Pearce et al.(1984)；Syn-COLG.同碰撞花岗岩；WPG.板内花岗岩；VAG.岛弧花岗岩；ORG.洋中脊花岗岩

Fig. 13. Diagram of tectonic setting of granite

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表 1 牌楼似斑状二长花岗岩主微量元素特征

Table 1. Whole-rock major (%) and trace (10^-6) elements compositions of the Pailou monzogranite

岩性	Pl-01	Pl-02	Pl-03
SiO₂	74.48	74.46	74.41
TiO₂	0.22	0.22	0.23
Al₂O₃	12.19	12.00	12.54
Fe₂O₃	0.93	0.78	0.91
FeO	1.82	2.13	1.72
MnO	0.08	0.08	0.06
MgO	0.03	0.02	0.07
CaO	1.18	0.91	0.78
Na₂O	4.39	4.41	4.92
K₂O	3.92	4.06	3.47
P₂O₅	0.01	0.01	0.03
Total	99.71	99.35	99.49
A/CNK	0.9	0.9	0.9
A/NK	1.1	1.0	1.1
Mg^#	2.0	1.0	5.0
FeO^T/(MgO+FeO^T)	0.99	0.99	0.97
Fe³⁺/(Fe³⁺+Fe²⁺)	0.32	0.25	0.32
Rb	82.04	88.16	88.33
Ba	624.2	654.7	662.2
Th	12.95	13.86	13.54
U	3.02	3.30	3.21
Nb	75.28	82.13	82.63
Ta	4.72	5.16	5.06
La	73.85	78.55	79.01
Ce	161.5	171.9	170.8
Pb	10.36	11.14	11.77
Pr	19.33	20.48	20.42
Sr	94.01	65.30	65.27
Nd	79.44	83.90	83.27
Sm	17.48	18.81	18.63
Zr	547.4	565.5	578.4
Hf	15.97	16.78	16.75
Eu	3.47	3.63	3.63
Gd	17.36	18.38	18.61
Tb	2.96	3.14	3.12
Dy	17.71	18.83	18.69
Y	95.78	102.81	103.47
Ho	3.46	3.66	3.65
Er	9.61	10.32	10.13
Tm	1.37	1.48	1.43
Yb	8.77	9.42	9.47
Lu	1.30	1.40	1.35
Cr	1.78	1.83	1.79
Co	0.18	0.16	0.17
Ni	0.26	0.22	0.20
Sc	1.81	1.87	1.86
Ga	31.67	29.48	29.80
LREE	355.04	377.23	375.81
HREE	62.54	66.63	66.44
Eu/Eu^*	0.61	0.60	0.60
Zr+Nb+Ce+Y	880	922	935
10 000×Ga/Al	4.87	4.60	4.45
Nb/La	1.02	1.02	1.05
Y/Nb	1.27	1.25	1.25
Sc/Nb	0.02	0.02	0.02
Yb/Ta	1.86	1.82	1.87
Y+Nb	171.06	184.94	186.11

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表 2 牌楼二长花岗岩锆石U-Pb年龄和Lu-Hf同位素特征

Table 2. LA-ICP-MS zircon U-Pb age and in-situ Hf isotope analysis data from the Pailou monzogranite

测试点	Th/ U	比值						年龄(Ma)		谐和度 (%)	比值						ε_Hf(0)	ε_Hf(t)	T_DM1 (Ma)	T_DM2 (Ma)
测试点	Th/ U	²⁰⁷Pb/²⁰⁶Pb	σ	²⁰⁷Pb/²³⁵U	σ	²⁰⁶Pb/²³⁸U	σ	²⁰⁶Pb/²³⁸U	σ	谐和度 (%)	¹⁷⁶Yb/¹⁷⁷Hf	σ	¹⁷⁶Lu/¹⁷⁷Hf	σ	¹⁷⁶Hf/¹⁷⁷Hf	σ	ε_Hf(0)	ε_Hf(t)	T_DM1 (Ma)	T_DM2 (Ma)
Pl-1	0.49	0.062 4	0.002 9	0.929 5	0.038 6	0.108 5	0.001 6	663.9	9.5	99
Pl-3	0.84	0.060 9	0.003 9	0.931 5	0.052 1	0.109 1	0.001 4	667.6	8.1	99	0.023 50	0.000 14	0.000 84	0.000 00	0.282 33	0.000 01	-15.6	-1.3	1 295	1 675
Pl-4	0.53	0.060 7	0.003 4	0.896 4	0.045 6	0.108 2	0.001 7	662.3	10.0	98
Pl-5	0.51	0.062 0	0.003 5	0.919 0	0.047 4	0.109 1	0.001 7	667.3	10.1	99	0.025 73	0.000 11	0.000 93	0.000 00	0.282 32	0.000 01	-15.9	-1.6	1309	1 695
Pl-7	0.84	0.062 6	0.001 6	0.956 1	0.023 4	0.109 9	0.001 1	672.3	6.4	98
Pl-8	0.45	0.063 3	0.003 2	0.955 3	0.036 2	0.108 6	0.001 6	664.4	9.4	97
Pl-9	0.54	0.063 7	0.003 0	0.953 5	0.041 4	0.109 2	0.001 6	668.0	9.2	98	0.025 89	0.000 20	0.000 94	0.000 01	0.282 39	0.000 01	-13.4	+0.9	1 212	1 538
Pl-10	0.46	0.062 2	0.003 7	0.940 3	0.047 6	0.109 8	0.001 9	671.3	11.2	99
Pl-11	0.76	0.062 5	0.002 5	0.930 8	0.032 8	0.109 3	0.001 3	668.5	7.8	99
Pl-12	0.46	0.060 7	0.003 2	0.917 2	0.046 7	0.108 9	0.001 3	666.3	7.8	99
Pl-13	0.53	0.060 1	0.002 8	0.890 8	0.040 0	0.108 3	0.001 5	662.8	8.5	97
Pl-14	0.96	0.063 4	0.002 1	0.942 8	0.031 3	0.108 5	0.001 5	664.1	8.8	98
Pl-15	0.51	0.064 4	0.003 0	0.948 5	0.043 7	0.108 6	0.001 8	664.7	10.7	98	0.020 28	0.000 04	0.000 75	0.000 00	0.282 23	0.000 01	-19.2	-4.9	1 434	1 903
Pl-16	0.49	0.061 2	0.003 2	0.906 1	0.043 1	0.107 6	0.001 4	658.9	8.3	99
Pl-17	0.49	0.060 8	0.003 2	0.912 4	0.044 2	0.108 5	0.001 6	663.9	9.2	99
Pl-19	0.46	0.064 2	0.003 6	0.953 2	0.047 5	0.109 7	0.001 9	670.8	10.8	98
Pl-20	0.45	0.062 2	0.003 3	0.920 4	0.042 3	0.109 4	0.001 5	669.4	8.9	98	0.015 64	0.000 03	0.000 57	0.000 00	0.282 57	0.000 01	-7.0	+7.5	950	1 123
Pl-21	0.51	0.062 1	0.003 9	0.952 1	0.050 0	0.110 8	0.001 6	677.6	9.4	99
Pl-22	1.19	0.063 3	0.002 2	0.951 7	0.028 0	0.109 0	0.001 2	667.1	7.1	98	0.069 92	0.000 23	0.002 47	0.000 01	0.282 34	0.000 01	-15.4	-1.8	1 344	1 706
Pl-25	0.57	0.062 1	0.003 6	0.940 2	0.045 7	0.110 5	0.001 5	675.7	8.7	99	0.021 73	0.000 07	0.000 79	0.000 00	0.282 37	0.000 02	-14.1	+0.6	1 235	1 569
Pl-27	0.49	0.060 8	0.003 2	0.908 6	0.044 5	0.108 3	0.001 6	662.6	9.5	99
Pl-28	0.55	0.063 3	0.003 4	0.933 5	0.048 7	0.109 2	0.001 6	668.1	9.5	99
Pl-29	0.48	0.062 8	0.003 3	0.924 2	0.041 6	0.108 6	0.001 7	664.9	9.9	99
Pl-30	0.48	0.062 0	0.003 0	0.917 4	0.042 1	0.108 8	0.001 6	666.0	9.1	99	0.023 18	0.000 03	0.000 83	0.000 00	0.282 41	0.000 01	-12.8	+1.5	1 186	1 501

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表 3 牌楼似斑状二长花岗岩角闪石主量元素(%)成分特征

Table 3. Representative chemical compositions (%) of hornblende from the Pailou monzogranite

岩性	Pl-01				Pl-02
SiO₂	38.05	38.09	38.21	38.10	38.19	38.28	38.33	38.35
TiO₂	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Al₂O₃	11.38	11.09	11.05	11.38	11.41	11.12	11.39	10.87
FeO^T	31.47	31.65	31.49	31.83	32.01	31.66	32.38	31.80
MnO	0.71	0.71	0.67	0.70	0.59	0.65	0.69	0.79
MgO	0.18	0.15	0.12	0.17	0.13	0.16	0.13	0.13
CaO	10.20	10.09	10.28	10.07	10.07	10.15	10.25	10.46
Na₂O	1.66	1.63	1.60	1.55	1.64	1.62	1.49	1.53
K₂O	2.89	2.86	2.82	3.04	2.93	2.90	2.88	2.75
P₂O₅	0.00	0.00	0.00	0.01	0.11	0.02	0.03	0.00
Total	96.54	96.27	96.24	96.85	97.08	96.55	97.55	96.68
以23个O原子为基准计算
Si	6.29	6.31	6.34	6.27	6.28	6.33	6.26	6.34
^IVAl	1.71	1.69	1.66	1.73	1.72	1.67	1.74	1.66
^VIAl	0.51	0.48	0.50	0.48	0.49	0.49	0.45	0.46
Ti	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Fe³⁺	0.45	0.50	0.38	0.56	0.55	0.46	0.63	0.42
Fe²⁺	3.90	3.88	3.99	3.82	3.85	3.92	3.79	3.98
Mn	0.10	0.10	0.09	0.10	0.08	0.09	0.09	0.11
Mg	0.04	0.04	0.03	0.04	0.03	0.04	0.03	0.03
Ca	1.81	1.79	1.83	1.78	1.77	1.80	1.79	1.85
Na	0.53	0.52	0.51	0.49	0.52	0.52	0.47	0.49
K	0.61	0.61	0.60	0.64	0.61	0.61	0.60	0.58
(Ca+Na)_B	2.00	2.00	2.00	2.00	2.00	2.00	2.00	2.00
Na_B	0.19	0.21	0.17	0.22	0.23	0.20	0.21	0.15
(Na+K)_A	0.95	0.92	0.94	0.91	0.91	0.93	0.86	0.92
Mg/(Mg+Fe²⁺)	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01
Fe³⁺/(Fe³⁺+^VIAl)	0.47	0.51	0.43	0.54	0.53	0.48	0.58	0.48
注：角闪石的化学式为A_0-1B₂^VIC₅^IVT₈O₂₂；A.代表占据A位置的阳离子；B.代表占据B位置的阳离子.

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参考文献(46)

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