大兴安岭南段晚石炭世敖仑岩体成因及其对古亚洲洋演化的启示

郭喜运; 李猛兴

doi:10.12097/j.issn.1671-2552.2022.07.006

大兴安岭南段晚石炭世敖仑岩体成因及其对古亚洲洋演化的启示

郭喜运¹,
李猛兴^2, ,

1.
山西省矿产资源调查监测中心, 山西太原 030024

2.
山西省地质调查院有限公司, 山西太原 030006

基金项目:
中国地质调查局项目《1:5万勃洛浑迪等四幅区调》(编号: 1212010781033)

详细信息

作者简介: 郭喜运(1988-), 男, 高级工程师, 从事区域地质调查及矿产勘查工作

通讯作者: 李猛兴(1985-), 硕士, 高级工程师, 从事矿产勘查工作。E-mail: 282665774@qq.com

中图分类号: P534.45;P588.12⁺1

收稿日期: 2020-04-08

修回日期: 2020-06-18

刊出日期: 2022-07-15

Petrogenesis of the Late Carboniferous Aolun granite in the southern Da Hinggan Mountains and its insight into the evolution of the Paleo-Asia Ocean

GUO Xiyun¹,
LI Mengxing^2, ,

1.
Shanxi Mineral Resources Survey and Monitoring Center, Taiyuan 030024, Shanxi, China

2.
Shanxi Institute of Geological Survey Co., Ltd., Taiyuan 030006, Shanxi, China

More Information

Corresponding author: LI Mengxing, 282665774@qq.com

Received Date: 08 April 2020

Revised Date: 18 June 2020

Publish Date: 15 July 2022

摘要

摘要:
对位于兴安地块南段的敖仑岩体进行了LA-ICP-MS锆石U-Pb定年和岩石地球化学特征研究, 探讨了岩石成因及地质意义。岩体由石英二长岩、二长花岗岩2种岩性组成, 其中主体岩性二长花岗岩锆石U-Pb定年结果为315.6±0.9 Ma, 为晚石炭世岩浆活动的产物。岩体具有富钠(Na₂O含量3.27%~7.24%)、富碱(Na₂O+K₂O含量8.19%~9.17%)、弱(强)过铝质(A/CNK=1.01~1.22)的特征, 稀土元素总量偏低(72.7×10^-6~223.3×10^-6), 负Eu异常不明显(δEu=0.62~0.93), 富集大离子亲石元素(Rb、Th、K等)及轻稀土元素, 亏损Sr, 不同程度亏损高场强元素(Ta、Nb、P、Ti), 成因类型以高钾钙碱性的I型为主, 并向A型过渡, 具有明显的陆壳成分特征; 结合相关构造图解分析, 岩体为造山后伸展阶段早期的产物, 进而推测该地区古亚洲洋的闭合在晚石安世(315.6±0.9 Ma)之前。
- 晚石炭世 /
- I型花岗岩 /
- 地球化学 /
- 岩石成因 /
- 大兴安岭 /
- 地质调查工程
Abstract:
In this paper, zircon U-Pb age, geochemical characteristics study has been conducted on the Aolun granite, which is located in the Xing'an block.The granite is composed of quartz monosite and monzontic granite.The zircon U-Pb age of monzontic granite is 315.6±0.9 Ma, indicating that they are the the products of magmatic activity in the Late Carboniferous.The Aolun granite is enriched in Na(Na₂O=3.27%~7.24%), alkali(Na₂O+K₂O=8.19%~9.17%)and belongs to weakly peraluminous-strongly peraluminous granite(A/CNK=1.01~1.22).The granite has lower ΣREE, without pronounced negative Eu anomalies(δEu=0.62~0.93).It also enriched in some LILE(Rb, Th, K)and LREE, depletions Sr and different depletions HFSE(Ta, Nb, P, Ti).The granite is a I-type granite and belongs to the high K calc-alkaline series, and transitions to A-type granite.These features are similar to geochemical characteristics of continental crust composition.Combined with tectonic enevironment discrimination diagram, the Aolun granite is the product of the early stage post-orogenic extension, it is suggested that the region of the Paleo-Asian Ocean closed before the Late Carboniferous(315.6±0.9 Ma).
- Late Carboniferous /
- I-type granite /
- geochemistry /
- petrogenesis /
- Da Hirggan Mounrains /
- geological survey engineering

HTML全文

图 1 兴蒙造山带东段大地构造略图(a, 据参考文献[1]修改) 和敖仑岩体地质图^①(b)

Figure 1.

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图 2 敖仑岩体锆石阴极发光(CL)图像及年龄

Figure 2.

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图 3 敖仑岩体U-Pb谐和图

Figure 3.

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图 4 敖仑岩体SiO₂-(K₂O+Na₂O)(a)^[15]、SiO₂-K₂O(b)^[16]及A/CNK-A/NK图解(c)^[17]

Figure 4.

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图 5 敖仑岩体哈克图解

Figure 5.

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图 6 敖仑岩体稀土元素球粒陨石标准化配分模式(a)及原始地幔标准化蛛网图(b)^[18]

Figure 6.

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图 7 敖仑岩体岩石成因相关图解(图a、c、d分别据参考文献[20][21][22])

Figure 7.

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图 8 敖仑岩体La-La/Yb(a)^[26]、Sr-Ba(b)^[27]、La-(La/Yb)_N(c)^[27]关系图解

Figure 8.

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图 9 敖仑岩体构造环境判别图解^[30]

Figure 9.

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表 1 敖仑岩体LA-ICP-MS锆石U-Th-Pb定年结果

Table 1. Results of LA-ICP-MS zircon U-Th-Pb dating of the Aolun granite

测点号	含量/10^-6			Th/U	同位素比值						年龄/Ma
测点号	Pb	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
1	5	73	97	0.76	0.0525	0.0015	0.3631	0.0105	0.0502	0.0003	308	65	315	9	315	2
2	5	59	94	0.63	0.0528	0.0015	0.3668	0.0105	0.0504	0.0003	321	64	317	9	317	2
3	5	67	87	0.78	0.0527	0.0015	0.3624	0.0107	0.0498	0.0003	317	66	314	9	314	2
4	4	62	75	0.82	0.0527	0.0018	0.3645	0.0128	0.0502	0.0003	315	78	316	11	316	2
5	4	50	74	0.68	0.0527	0.0024	0.3639	0.0169	0.0500	0.0003	318	106	315	15	315	2
6	4	45	72	0.63	0.0527	0.0023	0.3653	0.0158	0.0503	0.0003	315	99	316	14	316	2
7	5	62	86	0.73	0.0527	0.0019	0.3639	0.0131	0.0501	0.0003	316	81	315	11	315	2
8	6	82	107	0.76	0.0527	0.0014	0.3650	0.0101	0.0502	0.0003	316	60	316	9	316	2
9	12	160	225	0.71	0.0526	0.0008	0.3648	0.0056	0.0503	0.0003	311	35	316	5	316	2
10	4	57	77	0.74	0.0528	0.0022	0.3662	0.0154	0.0503	0.0003	319	94	317	13	317	2
11	6	90	107	0.85	0.0528	0.0015	0.3649	0.0104	0.0502	0.0003	318	64	316	9	316	2
12	3	45	60	0.75	0.0813	0.0045	0.5617	0.0298	0.0501	0.0005	1229	109	453	24	315	3
13	7	86	130	0.66	0.0526	0.0012	0.3635	0.0084	0.0501	0.0003	311	52	315	7	315	2
14	3	35	58	0.60	0.0527	0.0025	0.3650	0.0176	0.0502	0.0003	316	109	316	15	316	2
15	6	82	115	0.71	0.0526	0.0015	0.3649	0.0102	0.0503	0.0003	312	64	316	9	316	2
16	4	22	71	0.32	0.0519	0.0022	0.3595	0.0154	0.0502	0.0003	282	97	312	13	316	2
17	5	7	118	0.06	0.0527	0.0015	0.3642	0.0107	0.0501	0.0003	315	66	315	9	315	2
18	9	116	151	0.77	0.0526	0.0009	0.3645	0.0067	0.0503	0.0004	310	41	316	6	316	3
注：测试单位为天津地质矿产研究所同位素实验室，测试时间为2010年10月

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表 2 敖仑岩体主量、微量和稀土元素分析结果

Table 2. Major, trace and rare earth elements compositions of the Aolun granite

样品编号	PM303-1	PM301-10	PM301-11	PM303-2	D3935	PM301-13	PM301-12
岩性	石英二长岩	二长花岗岩
SiO₂	66.78	71.88	72.41	70.21	70.88	76.76	72.37
TiO₂	0.72	0.49	0.42	0.46	0.43	0.11	0.4
Al₂O₃	16.02	14.69	14.57	15.17	15.16	12.25	15.37
Fe₂O₃	2.52	1.91	1.61	2.63	2.26	0.95	1.48
FeO	1.25	0.25	0.27	0.25	0.15	0.13	0.17
MnO	0.09	0.05	0.03	0.06	0.04	0.02	0.04
MgO	0.65	0.20	0.24	0.14	0.13	0.10	0.11
CaO	1.99	0.37	0.55	0.66	0.75	0.36	0.43
Na₂O	4.99	4.56	3.73	5.17	4.51	3.27	7.24
K₂O	3.50	4.09	4.46	4	4.38	5.29	1.34
P₂O₅	0.23	0.11	0.09	0.08	0.09	0.02	0.09
CO₂	0.1	0.06	0.17	0.04	0.06	0.08	0.06
H₂O⁺	0.94	1.13	1.25	0.91	0.94	0.51	0.76
DI	83.42	92.95	91.93	91.68	91.40	96.25	94.41
A/CNK	1.03	1.17	1.22	1.08	1.12	1.04	1.09
σ₄₃	3.00	2.57	2.26	3.07	2.82	5.23	3.38
Na₂O+K₂O	8.49	8.65	8.19	9.17	8.89	8.56	8.58
K₂O/Na₂O	0.7	0.9	1.2	0.77	0.97	1.62	0.19
TFeO	3.52	1.97	1.72	2.62	2.18	0.98	1.50
TFeO/MgO	5.41	9.84	7.16	18.69	16.80	9.85	13.65
Rb	61.6	101.0	139.0	49.9	92.6	122.0	23.2
Nb	11.8	11.8	13.8	9.96	10.3	6.83	9.87
Ta	1.28	1.33	1.74	1.19	1.47	1.74	1.00
Th	5.70	5.70	9.85	3.72	6.89	18.10	2.72
Ba	879	788	714	875	819	368	288
Sr	283	113	99.6	93.7	183	73.9	47.4
Zr	304	303	289	330	258	90.4	276
Hf	8.24	8.4	8.17	9.21	7.35	3.4	7.76
Ni	5.78	6.29	5.99	4.14	5.12	15	6.92
Cr	6.65	8.1	5.46	8.17	3.58	5.1	6.11
La	27.20	26.30	34.00	27.90	22.80	11.90	13.30
Ce	68.70	58.70	77.30	71.30	48.50	20.70	31.30
Pr	8.48	7.65	9.75	8.72	5.95	3.00	5.16
Nd	35.50	30.60	38.10	35.10	23.50	11.20	23.50
Sm	8.00	6.31	8.04	7.78	5.11	2.39	6.18
Eu	2.24	1.40	1.46	1.90	1.33	0.50	1.30
Gd	6.45	5.00	5.90	6.82	4.35	1.85	5.30
Tb	1.20	0.99	1.11	1.17	0.69	0.37	0.97
Dy	6.80	5.79	6.02	6.77	4.35	2.30	6.10
Ho	1.37	1.22	1.21	1.33	0.88	0.49	1.23
Er	3.96	3.63	3.55	4.00	2.65	1.55	3.58
Tm	0.63	0.60	0.58	0.65	0.43	0.28	0.61
Yb	4.29	4.09	3.84	4.49	2.94	2.07	4.24
Lu	0.61	0.59	0.56	0.65	0.45	0.32	0.60
Y	34.90	32.60	32.00	33.90	25.40	13.80	30.50
ΣREE	175.43	152.87	191.41	178.58	123.94	58.92	103.38
ΣLREE	150.12	130.96	168.65	152.70	107.19	49.69	80.74
ΣHREE	25.31	21.91	22.76	25.88	16.75	9.23	22.64
ΣLREE/ΣHREE	5.93	5.98	7.41	5.90	6.40	5.38	3.57
(La/Yb)_N	4.55	4.61	6.35	4.45	5.55	4.11	2.24
(La/Sm)_N	2.20	2.69	2.73	2.31	2.88	3.21	1.38
(Gd/Yb)_N	1.24	1.01	1.27	1.26	1.22	0.74	1.03
δEu	0.93	0.74	0.62	0.78	0.84	0.7	0.68
Mg^#	22.27	13.60	17.79	7.66	8.45	13.60	10.20
T_Zr/℃	833	856	857	853	834	744	837
注：测试单位为武汉综合岩矿测试中心，测试时间为2009年6月。主量元素含量单位为%，微量和稀土元素含量单位为10^-6

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