大别山北缘商城岩体SHRIMP锆石U-Pb年龄、地球化学及地质意义

黄丹峰; 卢欣祥; 罗照华; 宋要武; 吕国营

doi:10.3799/dqkx.2018.558

大别山北缘商城岩体SHRIMP锆石U-Pb年龄、地球化学及地质意义

doi: 10.3799/dqkx.2018.558

黄丹峰^1,2, ,,
卢欣祥³,
罗照华⁴,
宋要武^1,2,
吕国营¹

1.
河南省地质调查院, 河南郑州 450001
2.
河南省金属矿产成矿地质过程与资源利用重点实验室, 河南郑州 450001
3.
河南省国土资源科学研究院, 河南郑州 450053
4.
中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083

基金项目:

河南省自然科学基金项目 182300410106

国家重点研发计划项目 2016YFC0600504-02

中国地质调查局项目 121201004000160901-18

详细信息

作者简介:
黄丹峰(1985-), 男, 硕士, 工程师, 从事矿产勘查和相关研究工作

中图分类号: P581
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出版历程
- 收稿日期: 2018-12-08
- 刊出日期: 2019-11-15

Zircon SHRIMP U-Pb Age, Geochemical Characteristics and Geological Implications of Shangcheng Pluton in the Northern Margin of Dabie Mountain

1.
Henan Institute of Geological Survey, Zhengzhou 450001, China
2.
Henan Key Laboratory for Metallogenetic Process and Resources Utilization of Metallic Minerals, Zhengzhou 450001, China
3.
Scientific Academy of Land and Resources of Henan, Zhengzhou 450053, China
4.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China

摘要

摘要: 商城岩体位于大别造山带北淮阳火山岩带中段，被早白垩世金刚台组火山岩不整合覆盖，厘定其侵位时间和成因对于揭示大别造山带晚中生代构造演化具有重要意义.对岩体进行SHRIMP锆石U-Pb测年和岩石地球化学研究，岩体中心相肆顾墩单元巨斑状二长花岗岩15个锆石测点中有13个测点的²⁰⁶Pb/²³⁸U年龄加权平均值为130.2±1.7 Ma，代表商城岩体最终就位的时间.商城岩体具有高含量的Al₂O₃、Sr，高Sr/Y值和低含量的Y、Yb，轻重稀土分馏显著，无Eu异常（δEu=0.90~1.05），发育Nb、Ta负异常，具有埃达克质岩石的地球化学特征.商城岩体3个岩相单元从早到晚长英质矿物结晶压力降低，侵位深度显著变浅，为挤压作用下主动侵位的结果.商城岩体是大别造山带早白垩世岩浆爆发的产物，岩浆起源于加厚下地壳的部分熔融，从商城岩体开始侵位至金刚台组火山岩喷发，该区地壳经历快速的隆升和剥蚀，而这一过程正是两者地球化学属性所反映的加厚下地壳减薄的浅表响应，130 Ma是大别造山带晚中生代构造体制转换的时间.
- 大别山 /
- 商城岩体 /
- SHRIMP锆石U-Pb年龄 /
- 早白垩世 /
- 构造体制转换 /
- 地质年代学
Abstract: Unconformably overlain by the Early Cretaceous volcanic rocks, the Shangcheng pluton is located in the central segment of the northern Huaiyang tectono-magmatic belt, Dabie orogen. It is of great importance to determine the emplacement age and petrogenesis of this pluton in terms of deciphering the Mesozoic tectonic evolution of the Dabie orogeny. In this paper, it reports the SHRIMP U-Pb zircon ages and whole rock geochemical data. For the central Sigudun unit of the pluton, thirteen zircon analysis spots out of fifteen yield zircon U-Pb ages of 130.2±1.7 Ma, representing the emplacement age of the pluton. The Shangcheng pluton displays high contents of Al₂O₃ and Sr, as well as high ratios of Sr/Y, and low abundances of Y and Yb, with Nb-Ta negative anomalies and pronounced LREE/HREE, but without obvious Eu anomalies (δEu=0.90~1.05), collectively pointing to an adakite affinity. Three units of Shangcheng pluton, from old to young, display a trend of gradually decreasing crystallization pressures corresponding to shallower emplacement depths step by step, suggesting that formed in an active emplacement background. The Shangcheng pluton results from the Early Cretaceous magmatic flare-up in the Dabie orogeny, and it is originated from the partial melting of the thickened lower crust. From the emplacement of the Shangcheng pluton to the eruption of the Jingangtai volcanics, this region has experienced rapid uplift and denudation. The process is exactly the surface response recorded by those two different geochemical signatures generated through thinning of the thickened lower crust. The 130 Ma is the time of tectonic regime transition of the Dabie orogen during the Mesozoic.
- Dabieshan /
- Shangcheng pluton /
- SHRIMP U-Pb zircon age /
- Early Cretaceous /
- tectonic regime transition /
- geochronology

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图 1 商城岩体地质简图

a.据刘振宏等(1994)修改；b.大别造山带构造分区图（张宏飞等，2001）.1.第四系；2.陈鹏组火山岩；3.金刚台组火山岩；4.商城岩体肆顾墩单元；5.商城岩体石鼓洼单元；6.商城岩体楼房湾单元；7.吴河岩体；8.程香铺单元；9.中侏罗统朱集组；10.上石炭统双石头组；11.上石炭统杨小庄组；12.上中侏罗统胡油坊组；13.泥盆系龟山组；14.泥盆系南湾组；15.下古生界商城群；16.断裂；17.角度不整合；18.涌动接触关系；19.测年样品位置及编号；20.侵入岩体；21.火山岩；22.北淮阳构造带；23.北大别构造带；24.南大别超高压变质单元；25.宿松高压变质单元；26.绿帘石蓝片岩单元；27.红安高压变质杂岩带；28.桐柏变质杂岩

Fig. 1. Simplified geological map of the Shangcheng pluton

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图 2 商城岩体岩石照片

a.商城岩体被金刚台组火山熔岩侵入；b.楼房湾单元中粒石英闪长岩发育片麻理；c.石鼓洼单元斑状粗粒花岗闪长岩；d.肆顾墩单元巨斑状粗粒黑云二长花岗岩

Fig. 2. Photographs of the Shangcheng pluton

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图 3 商城岩体锆石CL图像

图中白线段长度为100 μm

Fig. 3. CL images of sample B06 from the Shangcheng pluton

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图 4 商城岩体锆石U-Pb年龄谐和图

Fig. 4. U-Pb concordia diagram for zircons from Shangcheng granite samples

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图 5 商城岩体(Na₂O+K₂O)-SiO₂图解

据Middlemost（1994）

Fig. 5. SiO₂-(Na₂O+K₂O) classification diagram for the Shangcheng granite samples

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图 6 商城岩体K₂O-SiO₂图

据Rollinson（1993）

Fig. 6. SiO₂-K₂O diagram for the Shangcheng granite samples

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图 7 商城岩体稀土元素球粒陨石标准化图

球粒陨石标数据引自Boynton(1984)

Fig. 7. Chondrite-normalized REE patterns for the Shangcheng pluton

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图 8 商城岩体微量元素蛛网图

原始地幔数据引自Sun and MacDonough(1989)

Fig. 8. Spider diagram for the Shangcheng pluton

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图 9 商城岩体CIPW标准矿物Q-Ab-Or-H₂O相图

a.所有数据投点; b.各单元样品平均值投点；底图转邓晋福(1987）；单位为GPa

Fig. 9. Triangle diagrams of CIPW Q-Ab-Or-H₂O for the Shangcheng pluton

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图 10 Sr/Y-Y图解

底图据Defant(1990)；金刚台组火山岩数据黄丹峰（2010）

Fig. 10. Diagram of Sr/Y-Y

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表 1 商城岩体锆石SHRIMP U⁃Pb分析结果

Table 1. Zircon SHRIMP U⁃Pb dating results of sample B06 from the Shangcheng pluton

点号	U （10^-6）	Th （10^-6）	²³²Th/ ²³⁸U	²⁰⁶Pb* （10^-6）	²⁰⁶Pb_c (%)	²⁰⁷Pb^/ ²⁰⁶Pb^	±%	²⁰⁷Pb^*/ ²³⁵U	±%	²⁰⁶Pb^*/ ²³⁸U	±%	年龄（Ma）
点号	U （10^-6）	Th （10^-6）	²³²Th/ ²³⁸U	²⁰⁶Pb* （10^-6）	²⁰⁶Pb_c (%)	²⁰⁷Pb^/ ²⁰⁶Pb^	±%	²⁰⁷Pb^*/ ²³⁵U	±%	²⁰⁶Pb^*/ ²³⁸U	±%	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ
B06-1.1	166	109	0.68	2.89	0.00	0.057 5	7.3	0.161 0	7.7	0.020 28	2.5	129.5	± 3.3	512	±160
B06-2.1	344	205	0.62	6.12	0.00	0.051 0	4.2	0.145 9	4.8	0.020 74	2.4	132.3	± 3.1	242	± 96
B06-3.1	356	250	0.73	6.06	0.27	0.051 0	4.8	0.139 2	5.4	0.019 80	2.3	126.4	± 2.9	240	±110
B06-4.1	484	352	0.75	8.63	0.90	0.042 6	9.2	0.121 0	9.5	0.020 55	2.3	131.1	± 3.0	-189	±230
B06-5.1	191	130	0.70	3.44	0.00	0.048 8	5.4	0.140 8	5.9	0.020 92	2.5	133.5	± 3.3	139	±130
B06-6.1	347	224	0.67	6.23	0.28	0.049 7	5.1	0.143 2	5.6	0.020 87	2.3	133.2	± 3.1	183	±120
B06-7.1	410	299	0.75	7.41	0.32	0.050 6	4.2	0.146 3	4.8	0.020 98	2.3	133.9	± 3.1	221	± 97
B06-8.1	200	244	1.26	59.0	0.00	0.117 6	1.2	5.580 0	2.6	0.344 00	2.3	1 906	±38	1 921	± 21
B06-8.2	23	66	2.94	7.36	0.23	0.122 6	4.1	6.270 0	5.1	0.371 00	3.0	2 033	±53	1 994	± 72
B06-9.1	309	207	0.69	5.44	0.62	0.047 7	6.4	0.134 3	6.9	0.020 39	2.4	130.2	± 3.1	87	±150
B06-10.1	183	120	0.68	3.32	1.86	0.036 1	14	0.103 0	15	0.020 70	2.6	132.1	± 3.4	-623	±390
B06-11.1	335	268	0.83	5.77	0.27	0.047 5	5.2	0.131 2	5.7	0.020 00	2.4	127.7	± 3.0	77	±120
B06-12.1	175	137	0.81	3.16	1.09	0.050 0	7.0	0.143 0	7.4	0.020 77	2.5	132.5	± 3.3	194	±160
B06-13.1	474	590	1.29	7.91	0.48	0.048 5	7.2	0.129 4	7.5	0.019 33	2.4	123.5	± 2.9	125	±170
B06-14.1	335	256	0.79	5.88	0.74	0.045 6	5.4	0.127 6	6.0	0.020 29	2.8	129.5	± 3.5	-23	±130
注：应用实测的²⁰⁴Pb校正普通铅；Pb_c和Pb*分别为普通铅和放射成因铅；样品的标准校正误差均为0.44%.

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表 2 商城岩体主量元素结果（%）

Table 2. Major element analyses of the Shangcheng pluton

	楼房湾单元							石鼓洼单元						肆顾墩单元
序号	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
编号	SC-01	SC-05	SC-09	2174	2175	2178	2173	SC-02	SC-04	SC-14	2176	2177	2184	SC-06	SC-08	2171	2185	2188	2172
SiO₂	68.28	63.34	68.66	68.22	61.72	69.12	67.74	70.16	68.66	70.26	69.38	69.14	70.36	69.44	69.38	70.98	70.62	70.50	71.26
Al₂O₃	14.67	14.70	14.69	15.47	15.38	15.09	15.36	14.57	14.88	14.74	14.92	15.19	14.89	13.78	14.23	14.92	15.26	13.70	14.7
TiO₂	0.53	1.09	0.62	0.58	0.48	0.48	0.45	0.46	0.57	0.42	0.42	0.44	0.42	0.35	0.48	0.35	0.40	0.32	0.32
Fe₂O₃	1.56	2.40	1.78	1.79	1.63	1.45	1.57	1.29	1.45	1.04	1.63	1.57	2.16	1.12	1.47	1.11	0.57	1.13	1.57
FeO	1.51	2.73	1.56	1.59	1.74	1.50	1.66	1.29	1.44	1.20	1.47	1.52	1.40	1.41	1.48	1.14	1.76	1.66	1.25
CaO	2.46	3.26	2.30	1.93	2.36	1.87	2.63	2.14	2.14	1.95	1.80	3.12	1.24	1.91	2.22	1.66	1.43	1.80	1.50
MgO	1.17	1.91	1.07	1.48	1.29	1.16	1.48	0.82	0.88	0.77	1.48	1.39	1.25	1.024	1.34	0.79	1.88	1.48	0.76
K₂O	4.04	3.24	3.62	3.35	3.40	3.65	3.50	3.24	3.77	3.58	3.40	3.65	3.70	3.88	3.69	4.70	3.75	3.55	3.50
Na₂O	4.39	4.06	4.48	4.75	4.60	4.40	4.05	4.56	4.39	4.52	4.20	4.45	4.75	3.98	3.82	4.00	4.05	3.60	4.10
MnO	0.05	0.06	0.04	0.04	0.04	0.02	0.04	0.04	0.04	0.03	0.04	0.02	0.08	0.04	0.04	0.02	0.02	0.04	0.04
P₂O₅	0.31	0.48	0.38	0.17	0.19	0.18	0.21	0.26	0.33	0.22	0.12	0.13	0.12	0.22	0.23	0.12	0.13	0.22	0.08
H₂O⁺	0.31	1.44	0.28	0.98	1.28	0.53	0.61	0.32	0.58	0.44	0.73	0.35	0.33	1.28	1.13	0.37	0.46	1.35	0.80
H₂O^-	0.10	0.15	0.09					0.17	0.16	0.15				0.13	0.22
灼失	0.50	2.15	0.49	0.98	1.28	0.53		0.57	0.79	0.62	4.73	0.35	0.33	2.46	1.55		0.46	1.35
总和	99.47	99.42	99.70	100.4	100.1	99.45	99.90	99.40	99.33	99.35	99.59	99.97	100.7	99.61	99.94	100.2	100.32	99.35	99.88
Na₂O+K₂O	8.43	7.30	8.10	8.10	8.00	8.05	7.55	7.80	8.16	8.10	7.60	8.10	8.45	7.86	7.51	8.70	8.00	7.15	7.60
里特曼指数	2.81	2.62	2.56	2.60	3.42	2.48	2.30	2.24	2.59	2.41	2.19	2.51	2.61	2.34	2.14	2.71	2.20	1.86	2.04
Mg^#	42	41	38	45	42	42	46	37	36	39	47	46	40	43	46	40	60	50	34
注：序号为4~7、11~13、16~19的数据刘文斌等（2003），Mg^#=100×Mg²⁺/[Mg²⁺+Fe²⁺ (全铁) ].

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表 3 商城岩体微量元素含量（10^-6）

Table 3. Trace element analyses of the Shangcheng pluton

	楼房湾单元							石鼓洼单元						肆顾墩单元
序号	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
编号	SC-01	SC-05	SC-09	2174	2175	2178	2173	SC-02	SC-04	SC-14	2176	2177	2184	SC-06	SC-08	2171	2185	2188	2172
Sc	3.58	6.52	4.86					3.48	3.78	3.50				4.59	5.36
V	51.7	91.7	54.4	55.1	49.3	50.3	63.7	34.3	42.1	31.7	48.3	53.9	34.7	37.9	47.8	36.1	40.5	37.7	39.2
Cr	5.50	13.3	8.50	8.50	7.00	7.00	13.0	3.80	4.80	6.70	5.70	7.10	8.50	10.6	15.3	11.5	17.4	13.2	16.6
Co	5.83	11.72	7.02	3.60	3.20	2.30	5.00	5.06	5.34	4.80	1.70	1.50	3.20	5.74	6.59	4.1	6.7	5.2	3.2
Ni	3.10	8.48	4.50	6.90	6.60	6.80	9.60	2.95	3.62	3.63	5.50	5.00	4.50	5.73	6.86	3.9	7.5	6.2	4.6
Ga	21.2	19.9	22.8					21.9	21.0	21.4				17.6	17.5
Rb	77.9	50.4	78.7	85.3	81.1	91.0	103	48.5	41.9	72.0	92.8	86.1	101	106	112	110	88.7	90.3	113
Sr	869	1063	924	889	346	897	737	529	519	652	811	850	598	339	523	478	449	423	607
Y	11.1	23.0	12.1	9.00	8.20	7.40	9.88	8.79	10.6	8.71	7.50	6.71	5.90	8.47	13.6	5.07	8.30	7.25	5.33
Zr	222	302	264	213	195	176	192	133	135	166	177	216	129	137	166	169	122	119	176
Nb	10.8	15.6	13.01	8.80	7.60	6.90	11.7	9.27	10.3	8.04	6.50	9.50	6.00	4.92	11.5	8.30	12.4	8.70	7.90
Cs	1.24	1.10	1.75					1.50	1.05	2.03				1.87	2.94
Ba	1 491	2 033	1 648	1 961	1 788	2 102	1 459	1 254	1 645	1 482	1 778	1 786	1 398	665	831	1 807	394	493	2 045
Hf	12.5	18.1	14.6					7.86	8.51	8.95				7.88	9.32
Ta	0.67	1.01	0.84					0.61	0.64	0.51				0.35	0.82
Pb	21.2	17.2	18.9					20.4	19.9	22.8				24.1	21.7
Th	11.0	9.42	13.2	8.10	8.50	6.80	9.80	11.5	10.9	9.87	8.60	13.5	9.30	16.6	17.8	9.30	11.1	10.9	10.9
U	1.63	1.15	1.22	1.50	1.25	1.25	1.83	0.98	1.20	1.34	1.70	1.00	2.33	2.67	3.91	2.17	2.00	2.50	1.50
注：序号为4~7、11~13、16~19的数据刘文斌等（2003）.

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表 4 商城岩体稀土元素含量（10^-6）

Table 4. Rare earth element analyses of the Shangcheng pluton

	楼房湾单元							石鼓洼单元						肆顾墩单元
序号	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
编号	SC-01	SC-05	SC-09	2174	2175	2178	2173	SC-02	SC-04	SC-14	2176	2177	2184	SC-06	SC-08	2171	2185	2188	2172
La	64.1	95.9	71.5	50.7	51.5	47.5	40.1	62.2	65.9	68.2	44.5	48.3	34.9	32.8	78.3	36.4	33.4	31.6	38.7
Ce	110	193	132	92.4	97.7	85.6	71.7	110	121	118	81.2	85.7	62.8	59.6	114	66.7	56.7	52.1	70.7
Pr	12.1	23.2	15.1	9.63	9.85	9.01	7.38	12.2	14.0	13.0	8.66	9.14	5.95	6.32	11.15	6.76	5.91	4.78	7.08
Nd	42.6	86.2	53.2	37.6	39.1	36.0	28.9	42.7	49.1	45.0	33.2	34.7	23.7	22.0	37.0	26.5	22.7	17.9	26.4
Sm	6.21	13.2	8.00	6.09	6.44	5.66	4.85	6.28	7.27	6.38	5.53	5.83	3.72	3.41	5.46	4.41	3.75	2.93	4.28
Eu	1.64	3.29	2.02	1.49	1.54	1.41	1.23	1.65	1.87	1.73	1.30	1.36	0.96	0.96	1.38	1.12	0.92	0.72	1.00
Gd	4.32	8.90	5.06	3.75	4.11	3.43	3.33	4.03	4.742	3.98	3.38	3.53	2.26	2.514	3.797	2.69	2.61	2.06	2.62
Tb	0.55	1.15	0.65	0.45	0.51	0.35	0.44	0.48	0.58	0.49	0.39	0.41	0.23	0.35	0.52	0.34	0.35	0.26	0.34
Dy	2.56	5.40	2.88	1.97	2.15	1.78	2.07	2.11	2.58	2.09	1.73	1.83	1.14	1.75	2.73	1.50	1.79	1.39	1.28
Ho	0.40	0.87	0.44	0.34	0.38	0.30	0.39	0.32	0.385	0.30	0.30	0.32	0.18	0.316	0.48	0.25	0.34	0.27	0.22
Er	1.09	2.27	1.19	0.82	0.89	0.73	0.96	0.82	1.01	0.85	0.73	0.77	0.48	0.91	1.41	0.64	0.96	0.75	0.55
Tm	0.13	0.27	0.14	0.11	0.13	0.09	0.13	0.09	0.12	0.10	0.10	0.11	0.06	0.13	0.18	0.09	0.15	0.13	0.07
Yb	0.86	1.79	0.90	0.64	0.68	0.51	0.83	0.64	0.72	0.63	0.58	0.60	0.39	0.93	1.33	0.55	0.98	0.81	0.42
Lu	0.12	0.25	0.11	0.09	0.10	0.08	0.14	0.08	0.10	0.08	0.09	0.09	0.05	0.134	0.20	0.08	0.16	0.13	0.06
∑REE	247	435	293	206	215	193	162	244	269	261	182	193	137	132	258	148	131	116	154
(La/Yb)_N	50.6	36.2	53.3	53.4	51.1	62.8	32.6	65.1	61.4	72.5	51.7	54.2	60.3	23.8	39.6	44.6	23.0	26.3	62.2
δEu	0.97	0.93	0.97	0.95	0.92	0.98	0.94	1.00	0.97	1.05	0.92	0.92	1.01	1.00	0.93	0.99	0.90	0.90	0.91
Sr/Y	78.5	46.2	76.3	98.8	42.2	121	74.5	60.2	48.8	74.9	108	127	101	40.0	38.6	94.3	54.0	58.4	114
Y/Yb	12.9	12.8	13.5	14.1	12.1	14.5	11.9	13.7	14.7	13.8	12.9	11.2	15.1	9.10	10.2	9.20	8.50	9.00	12.7
(Ho/Yb)_N	1.35	1.41	1.42	1.55	1.63	1.71	1.37	1.46	1.55	1.39	1.51	1.55	1.34	0.99	1.04	1.32	1.01	0.97	1.52
(Gd/Lu)_N	4.59	4.51	5.52	5.18	5.11	5.33	2.96	6.26	6.02	6.11	4.67	4.88	5.62	2.33	2.37	4.18	2.03	1.97	5.43
注：序号为4~7、11~13、16~19的数据刘文斌等（2003），δEu=Eu_N/(Sm_N*×Gd_N)^1/2.

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