北山石板井地区英云闪长岩-石英闪长岩体锆石U-Pb年龄、成因及对古洋盆俯冲作用时限的制约

修迪; 陈超; 专少鹏; 申宗义; 王金贵; 程洲; 张立国; 王硕; 杨鑫朋; 侯德华; 石光耀; 张鹏程

北山石板井地区英云闪长岩-石英闪长岩体锆石U-Pb年龄、成因及对古洋盆俯冲作用时限的制约

河北省区域地质调查院, 河北廊坊 065000

基金项目:
中国地质调查局项目《阴山成矿带小狐狸山和雅布赖地区地质矿产调查》（编号：DD20160039）

详细信息

作者简介: 修迪(1985-), 女, 工程师, 从事岩石学与地球化学研究工作。E-mail:65957661@qq.com

通讯作者: 陈超(1984-), 男, 工程师, 从事区域地质矿产调查与研究工作。E-mail:chchgood@163.com

中图分类号: P588.12⁺3;P597⁺.3

收稿日期: 2017-02-20

修回日期: 2017-04-10

刊出日期: 2018-06-25

Zircon U-Pb age and petrogenesis of tonalite-quartz diorite in the Shibanjing area, central Beishan orogenic belt, and its constraint on subduction of the ancient oceanic basin

Hebei Regional Geological Survey Institute, Langfang 065000, Hebei, China

More Information

Corresponding author: CHEN Chao, chchgood@163.com

Received Date: 20 February 2017

Revised Date: 10 April 2017

Publish Date: 25 June 2018

摘要

摘要:
北山造山带中部石板井地区出露早古生代英云闪长岩-石英闪长岩体。用LA-ICP-MS技术测得该岩体石英闪长岩中锆石的²⁰⁶Pb/²³⁸U年龄为464.4±2.1Ma。岩石地球化学分析结果显示，岩石属钙碱性至高钾钙碱性、准铝质I型花岗岩。通过岩石成因分析，英云闪长岩-石英闪长岩体为来自地壳的岩浆与来自深部的亏损地幔岩浆，在高压（> 1.5GPa）、低温（719～792℃）条件下，经不均匀混合作用形成，同时有俯冲流体的加入，残留相为石榴子石+金红石（无角闪石）。岩石富集Rb、Ba、Th、U、K等大离子亲石元素，亏损Ta、Nb、P、Ti等高场强元素，显示出典型岛弧型花岗岩的地球化学特征。微量元素构造环境判别图进一步证明，岩体形成于岛弧环境。与南侧的红柳河-牛圈子-洗肠井古生代洋盆构成“沟-弧”体系，表明红柳河-牛圈子-洗肠井古洋盆在中奥陶世晚期已经向北俯冲，该洋盆闭合时限应晚于中奥陶世。
- 北山造山带 /
- 石板井 /
- 英云闪长岩-石英闪长岩 /
- 锆石U-Pb定年 /
- 岩石成因 /
- 构造背景
Abstract:
The Early Paleozoic Yingyun diorite-quartz diorite is exposed in the Shibanjing area of central Beishan orogenic belt. In this paper, LA-ICP-MS zircon U-Pb dating of the rock mass was conducted, and the ²⁰⁶Pb/²³⁸U average age is 464.4±2.1Ma. According to geochemical data, the rocks belong to the calc-alkaline to high potassium calc-alkaline, quasi-aluminous I type granite. In view of its petrogenesis, the authors hold that the magma source of tonalite-quartz diorite was formed by mixed magma from the crust and magma from the depleted mantle under the conditions of high pressure(>1.5GPa) and low temperature(719～792℃), with the residual minerals of garnet+ruble (without amphibole). Moreover, trace element composition is characterized by enrichment of large ion lithophile ele-ments (LILEs), such as Rb, Ba, Th, U and K, and depletion of high field strength elements(HFSEs), Ta, Nb, P, and Ti, showing the geo-chemical features of the typical island arc granite. It is further proved that the rock mass was formed in an island arc environment on the discriminant map of trace elements tectonic environment. It constitutes "oceanic trench-arc" system with the south side of the Hongli-uhe-Niuquanzi-Xichangjing Paleozoic oceanic basin, indicating that the Hongliuhe-Niuquanzi-Hidangjing Paleozoic basin had sub-ducted northward in the late Middle Ordovician. The closure time of the ocean basin should be later than Middle Ordovician.
- Beishan orogenic belt /
- Shibanjing /
- tonalite-quartz diorite /
- zircon U-Pb dating /
- petrogenesis /
- tectonic setting

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图 1 北山石板井地区地质简图(a据参考文献①②简化，b据参考文献[16])

Figure 1.

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图 2 石板井地区英云闪长岩(a、c)、石英闪长岩(b、d)野外及薄片显微特征

Figure 2.

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图 3 石板井地区英云闪长岩、石英闪长岩TAS(a)^[17]和SiO₂-K₂O图解(b)^[18]

Figure 3.

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图 4 石板井地区英云闪长岩、石英闪长岩A/CNK-A/NK图解(底图据参考文献[19])

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图 5 石板井地区英云闪长岩、石英闪长岩球粒陨石标准化稀土元素配分图(a)和原始地幔标准化微量元素蛛网图(b()标准化值据参考文献[20])

Figure 5.

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图 6 石板井地区石英闪长岩(PM01TW1)锆石阴极发光(CL)图像及²⁰⁶Pb/²³⁸U年龄值

Figure 6.

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图 7 石板井地区石英闪长岩LA-ICP-MS锆石U-Pb谐和图

Figure 7.

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图 8 石板井地区石英闪长岩、英云闪长岩K₂O-Na₂O图解

Figure 8.

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图 9 石板井地区石英闪长岩、英云闪长岩(La/Yb)_N-(Dy/Yb)_N和(Dy/Yb)_N-Nb/Ta图解(底图据参考文献[34])

Figure 9.

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图 10 石板井地区石英闪长岩、英云闪长岩微量元素构造环境判别图(底图据参考文献[44])

Figure 10.

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表 1 石板井地区英云闪长岩、石英闪长岩主量、微量和稀土元素含量及标准矿物、锆石饱和温度计算结果

Table 1. Analytical results of major, trace elements and REE concentrations and normative mineral, zircon saturation temperatures of the tonalite, quartz diorite in Shibanjing area

样品编号	SBJ1	SBJ2	SBJ3	SBJ4	SBJ5	SBJ6	SBJ7	SBJ8
岩性	英云闪长岩	英云闪长岩	英云闪长岩	石英闪长岩	石英闪长岩	石英闪长岩	石英闪长岩	石英闪长岩
SiO₂	64.87	67.38	64.24	59.76	62.05	57.90	61.82	58.54
TiO₂	0.43	0.37	0.64	0.79	0.64	0.91	0.72	0.85
Al₂O₃	15.95	17.21	15.71	16.88	17.17	17.34	17.47	17.65
Fe₂O₃	1.65	0.74	2.77	3.06	2.20	2.67	2.04	2.36
FeO	2.01	1.46	2.66	3.34	2.69	4.27	3.01	4.11
MnO	0.087	0.038	0.056	0.14	0.069	0.11	0.080	0.10
MgO	1.92	1.04	1.87	2.90	1.83	3.43	2.06	2.89
CaO	5.04	3.52	4.91	6.52	4.84	7.29	5.54	6.50
Na₂O	4.27	5.21	3.74	3.74	3.57	3.27	3.29	2.63
K₂O	1.95	1.35	1.54	1.06	2.79	1.19	2.05	2.51
P₂O₅	0.12	0.171	0.234	0.18	0.28	0.22	0.308	0.23
烧失量	1.53	1.34	1.36	1.48	1.52	1.24	1.24	1.44
总量	99.83	99.83	99.73	99.85	99.65	99.85	99.63	99.81
A/CNK	0.87	1.05	0.94	0.88	0.97	0.87	0.99	0.94
ALK	6.22	6.56	5.27	4.80	6.36	4.46	5.34	5.15
K₂O/Na₂O	0.46	0.26	0.41	0.28	0.78	0.36	0.62	0.95
Or	11.71	8.09	9.24	6.40	16.81	7.11	12.29	15.10
Ab	36.80	44.73	32.16	32.17	30.77	28.08	28.33	22.64
An	18.91	16.59	21.95	26.61	22.61	29.56	25.90	29.40
C	0.00	1.21	0.00	0.00	0.16	0.00	0.51	0.00
Rb	40.4	124	61.1	29.9	84.5	15.3	77.4	87.0
Ba	492	1714	1205	336	1532	367	2190	783
Th	6.36	6.22	4.74	5.96	4.92	4.16	1.76	9.60
U	1.63	1.38	1.96	1.66	0.85	1.22	0.97	1.19
Ta	0.96	0.52	0.56	0.70	0.52	1.00	0.45	0.61
Nb	10.4	7.59	10.6	9.10	8.59	5.28	9.90	10.3
Sr	462	538	897	415	733	542	829	431
Zr	136	109	156	173	184	126	177	246
Hf	5.70	3.80	4.89	8.32	8.53	5.48	8.52	6.70
V	53.5	39.2	96.2	113	74.5	150	104	113
Ni	12.4	2.10	10.8	6.89	5.81	11.1	6.91	10. 9
Cr	29.2	6.89	15.6	13.4	13.0	20.1	20.0	28.5
Ga	15.7	15.7	20.6	16.5	18.6	19.2	20.9	22.5
Cs	1.96	3.75	2.95	1.62	3.60	1.44	3.97	4.13
Pb	7.08	18.9	11.1	7.30	8.74	10.5	12.3	5.33
Y	9.76	9.93	13.3	19.2	13.7	18.5	15.4	22.5
La	14.3	16.5	21.2	17.9	32.2	17.1	21.7	47.0
Ce	27.9	39.4	43.9	36.1	67.2	43.5	52.7	93.1
Pr	3.54	4.78	5.29	4.87	8.59	5.13	6.72	10.9
Nd	12. 5	17.4	21.2	19.2	31.0	20.6	28.2	39.6
Sm	2.22	2.91	4.02	3.75	4.91	4.15	4.86	6.80
Eu	0.69	0.81	1.33	1.18	1.32	1.25	1.60	1.58
Gd	1.97	2.34	3.03	3.25	4.33	3.46	3.67	6.42
Tb	0.32	0.38	0.53	0.56	0.61	0.62	0.61	0.92
Dy	1.80	1.89	2.66	3.53	2.87	3.45	2.84	4.55
Ho	0.36	0.34	0.46	0.72	0.50	0.67	0.51	0.82
Er	1.04	0.96	1.37	2.07	1.46	1.81	1.45	2.25
Tm	0.15	0.14	0.20	0.31	0.18	0.32	0.22	0.33
Yb	1.06	0.90	1.18	2.17	1.18	1.85	1.36	1.94
Lu	0.18	0.17	0.18	0.33	0.20	0.25	0.18	0.28
∑REE	68.05	88.91	106.55	95.85	156.52	104.14	126.62	216.52
LREE/ HREE	8.91	11.51	10.09	6.41	12.82	7.38	10.68	11.37
δEu	0.99	0.92	1.12	1.01	0.85	0.98	1.11	0.72
(La/Yb)_N	9.71	13.16	12.89	5.92	19.60	6.64	11.45	17.43
(La/Sm)_N	4.17	3.66	3.40	3.08	4.23	2.66	2.88	4.46
(Gd/Yb)_N	1.54	2.15	2.12	1.24	3.04	1.55	2.23	2.74
Zr/Nb	0.55	0.97	0.46	0.91	0.99	1.04	0.86	0.65
Nb/Ta	10.86	13.15	18.86	13.01	16.64	5.27	21.90	16.80
Zr/Hf	23.79	32.36	31.95	20.85	21.55	22.92	20.77	36.77
Rb/Sr	0.09	0.05	0.07	0.07	0.12	0.03	0.09	0.20
Rb/Ba	0.08	0.06	0.05	0.09	0.06	0.04	0.04	0.11
Sr/Y	47.32	51.11	67.41	21.58	53.41	29.29	53.73	19.16
T_Zr/℃	739	792	760	751	773	719	772	786
注：A/CNK=Al₂O₃/(Na₂O+CaO+K₂O); δEu= Eu_N/((Sm_N+Gd_N)/2);T_Zr为据Watson等^[16]方法计算的锆石饱和温度；主量元素含量和标准矿物单位为%，微量和稀土元素为10^-6

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表 2 石板井地区石英闪长岩(PM01TW1)LA-ICP-MS锆石U-Th-Pb同位素分析结果

Table 2. LA-ICP-MS zircon U-Th-Pb data for the quartz diorite(PM01TW1)in Shibanjing area

测点	元素含量/10^-6			Th/U	同位素比值						同位素年龄/Ma
测点	Pb	U	Th	Th/U	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ
01	28	364	166	0.46	0.0751	0.0008	0.5851	0.0091	0.0565	0.0008	467.1	4.9	467.7	7.3	471.0	31
02	33	439	217	0.50	0.0741	0.0008	0.5843	0.0087	0.0572	0.0008	460.9	4.8	467.2	6.9	498.1	29
03	30	391	203	0.52	0.0741	0.0008	0.5855	0.0133	0.0573	0.0011	460.6	4.9	468.0	11	504.3	43
04	27	353	161	0.46	0.0751	0.0008	0.5837	0.0098	0.0563	0.0008	467.1	5.2	466.8	7.8	465.6	33
05	18	240	116	0.48	0.0745	0.0008	0.5802	0.0109	0.0565	0.0009	463.3	5.2	464.6	8.7	470.7	37
06	29	378	154	0.41	0.0752	0.0008	0.5811	0.0093	0.0560	0.0008	467.5	5.1	465.2	7.4	453.9	32
07	17	218	97	0.44	0.0744	0.0008	0.5834	0.0110	0.0568	0.0010	462.8	5.0	466.6	8.8	485.7	38
08	22	286	138	0.48	0.0747	0.0009	0.5778	0.0116	0.0561	0.0010	464.1	5.5	463.0	9.3	457.5	39
09	15	192	87	0.45	0.0743	0.0008	0.5848	0.0114	0.0571	0.0010	462.0	4.8	467.5	9.1	494.7	40
10	18	240	86	0.36	0.0753	0.0008	0.5807	0.0103	0.0559	0.0009	468.0	5.0	464.9	8.3	449.7	36
11	22	291	110	0.38	0.0750	0.0009	0.5821	0.0113	0.0563	0.0009	466.0	5.3	465.8	9.0	465.1	36
12	23	295	133	0.45	0.0749	0.0009	0.5809	0.0096	0.0562	0.0008	465.9	5.3	465.0	7.7	460.8	32
13	31	410	180	0.44	0.0742	0.0008	0.5845	0.0089	0.0572	0.0008	461.1	4.9	467.3	7.2	498.0	30
14	28	370	136	0.37	0.0742	0.0008	0.5787	0.0090	0.0565	0.0008	461.6	4.8	463.6	7.2	473.7	31
15	28	364	158	0.43	0.0750	0.0008	0.5818	0.0094	0.0562	0.0008	466.4	5.3	465.6	7.5	461.8	31
16	48	617	334	0.54	0.0743	0.0008	0.5865	0.0084	0.0572	0.0007	462.2	5.1	468.6	6.7	500.3	27
17	20	269	94	0.35	0.0744	0.0008	0.5837	0.0095	0.0569	0.0008	462.5	5.1	466.9	7.6	488.2	32
18	23	296	115	0.39	0.0752	0.0009	0.5786	0.0100	0.0558	0.0008	467.2	5.5	463.6	8.1	445.3	33
19	19	255	90	0.35	0.0746	0.0008	0.5892	0.0110	0.0573	0.0010	463.8	5.1	470.4	8.7	502.8	37
20	30	384	179	0.47	0.0749	0.0011	0.5835	0.0111	0.0565	0.0009	465.8	6.6	466.7	8.8	471.2	34
21	18	244	80	0.33	0.0754	0.0010	0.5849	0.0156	0.0563	0.0013	468.4	6.2	467.6	13	463.5	50
22	18	244	72	0.30	0.0750	0.0008	0.5840	0.0172	0.0564	0.0016	466.4	4.8	467.0	14	470.1	63
23	21	276	99	0.36	0.0741	0.0010	0.5816	0.0132	0.0569	0.0013	461.1	6.2	465.5	11	487.4	50
24	26	350	102	0.29	0.0751	0.0009	0.5881	0.0138	0.0568	0.0012	466.6	5.3	469.6	11	484.4	47

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