内蒙古赤峰敖汉地区酸性火山岩的形成时代、地球化学特征及其意义

李斌; 刘淼; 陈井胜; 李伟; 杨帆; 汪岩; 崔天日

doi:10.3799/dqkx.2019.226

内蒙古赤峰敖汉地区酸性火山岩的形成时代、地球化学特征及其意义

doi: 10.3799/dqkx.2019.226

李斌^1,,
刘淼^1, ,,
陈井胜¹,
李伟¹,
杨帆^1,2,
汪岩¹,
崔天日¹

1.
中国地质调查局沈阳地质调查中心, 辽宁沈阳 110034
2.
吉林大学地球科学学院, 吉林长春 130061

基金项目:

中国地质调查局项目 12120113053400

中国地质调查局项目 DD20160048-05

中国地质调查局项目 DD20190042-04

详细信息

作者简介:
李斌(1986—), 男, 工程师, 从事岩石学研究

通讯作者:
刘淼(1989—)

中图分类号: P581
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- 被引次数: 0
出版历程
- 收稿日期: 2019-09-10
- 刊出日期: 2019-11-11

Geochronology and Geochemical Characteristics of Acid Volcanic Rocks in Aohan Area, Inner Mongolia

Li Bin^1
,,
Liu Miao^{1
, ,},
Chen Jingsheng¹,
Li Wei¹,
Yang Fan^1,2,
Wang Yan¹,
Cui Tianri¹

1.
Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, China
2.
College of Earth Sciences, Jilin University, Changchun 130061, China

摘要

摘要: 为对内蒙古敖汉地区酸性火山岩进行划分对比，对其进行了锆石U-Pb测年、地球化学分析.流纹岩和流纹质晶屑凝灰岩年龄分别为122.8±2.3 Ma、122.1±1.9 Ma，属于早白垩世义县组.晚侏罗世流纹岩SiO₂和全碱含量较高，Al₂O₃含量较低；稀土总量较低、具有负铕异常；富集Rb、Th、U、K，亏损Ba、Sr、P、Ti.早白垩世流纹岩SiO₂、全碱、Al₂O₃含量较高；稀土总量较高、稀土分馏明显、弱负铕异常；富集K、Rb、Ba、Th、U，亏损Nb、Ta、Sr、P、Ti.将敖汉地区晚侏罗世酸性火山岩进行了解体，首次将其大部分划为早白垩世义县组.晚侏罗世流纹岩可能为高分异流纹岩，形成于相对低的压力环境下，可能起源于中上地壳物质部分熔融.早白垩世流纹岩显示出埃达克质岩石的地球化学特征，可能形成于加厚的下地壳环境.
- 酸性火山岩 /
- 年代学 /
- 地球化学 /
- 义县组 /
- 内蒙古 /
- 岩石学
Abstract: Zircon U-Pb dating and geochemical analysis were carried out to classify and compare the acidic volcanic rocks in Aohan, Inner Mongolia. Zircon U-Pb ages of rhyolite and rhyolitic crystal tuff are 122.8±2.3 Ma and 122.1±1.9 Ma, belonging to the Yixian Formation of Early Cretaceous. Late Jurassic rhyolite contains of high SiO₂ and alkali (Na₂O+ K₂O), low Al₂O₃ and low total REE, with negative Eu anomaly, indicating REE "tetrad effect". It is enriched in large ion lithophile elements Rb, Th, U, K and and depleted in high field strength elements Ba, Sr, P and Ti. Early Cretaceous rhyolite has high contents of SiO₂, alkali (Na₂O+K₂O) and Al₂O₃; it is characterized by high total REE, enrichment of LREE, clear fractionation of light and heavy rare earth, weak negative Eu anomaly; enrichment of large ion lithophile elements K, Rb, Ba, Th, U, and depletion of Nb, Ta, Sr, P and Ti. In this paper, the Late Jurassic acid volcanic rocks in Aohan area are disintegrated and most of them are classified as Early Cretaceous Yixian Formation for the first time. Late Jurassic rhyolite may be highly differentiated rhyolite. Geochemical characteristics show that it was formed under relatively low pressure environment and may have been originated from partial melting of upper and middle crustal materials. Early Cretaceous rhyolite shows the geochemical characteristics of adakitic rocks, which may formed in the thicker lower crustal environment.
- acid volcanic rock /
- geochronology /
- geochemistry /
- Yixian Formation /
- Inner Mongolia /
- petrology

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图 1 研究区地质简图

1.晚白垩世孙家湾组砂砾岩；2.早白垩世义县组酸性火山岩；3.早白垩世义县组英安质火山岩；4.早白垩世义县组安山质火山岩；5.早白垩世义县组底砾岩；6.晚侏罗世酸性火山岩；7.晚古生代地层；8.古元古代宝音图群；9.侵入岩；10.断层；11.同位素采样点及年龄.红色为本文采集的同位素样品

Fig. 1. Simplified geological map of the study area

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图 2 晚侏罗世流纹岩（a, b）和早白垩世流纹岩（c, d）、流纹质晶屑凝灰岩（e, f）野外和显微照片

a, b的样品编号为PM202-13-3；c, d的样品编号为PM305-7-1；e, f的样品编号为B3010-1

Fig. 2. Field photographs and micrographs of Jurassic rhyolites (a, b) and Early Cretaceous rhyolitic (c, d), rhyolitic crystal tuff (e, f)

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图 3 锆石典型CL图像

Fig. 3. Zircon CL microscopic images

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图 4 流纹岩和流纹质晶屑凝灰岩的锆石U-Pb谐和图

Fig. 4. U-Pb concordia diagrams of zircons from rhyolites and rhyolitic crystal tuff

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图 5 流纹岩SiO₂-(Na₂O+K₂O)(a)、SiO₂-K₂O(b)、A/CNK-A/NK(c)图解

Fig. 5. SiO₂-(Na₂O+K₂O)(a), SiO₂-K₂O (b) and A/CNK-A/NK(c) patterns of rhyolites

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图 6 流纹岩样品的稀土元素配分曲线(a, b)和微量元素蛛网图(c, d)

Fig. 6. Chondrite-normalized REE patterns (a, b) and trace element spidergrams(c, d) of rhyolites

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图 7 SiO₂-FeO^T/MgO(a)、(Zr+Nb+Ce+Y)-FeO^T/MgO(b)、(La/Yb)_N-Yb_N(c)和Sr/Y-Y(d)图解

A.A型花岗岩；I & S.I和S型花岗岩；FG.分异的长英质花岗岩；OGT.未分异的M、I、S型花岗岩

Fig. 7. SiO₂-FeO^T/MgO(a), (Zr+Nb+Ce+Y)-FeO^T/MgO(b), (La/Yb)_N-Yb_N(c) and Sr/Y-Y(d) patterns of rhyolites

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图 8 义县组安山质火山岩与酸性火山岩出露特征

1.安山岩；2.流纹质晶屑凝灰岩；3.流纹质火山角砾岩；4.含角砾安山岩；5.溢流相；6.爆发相；7.爆发沉积相；8.第四系；9.产状；10.高程点及高程；11.岩相界线

Fig. 8. Outcropping characteristics of andesite volcanic rocks and acid volcanic rocks in Yixian Formation

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表 1 锆石LA-ICP-MS U-Pb分析结果

Table 1. LA-ICP-MS zircon U-Pb data

测点编号	Pb	Th	U	Th/U	同位素比值				年龄（Ma）
测点编号	(10^-⁶)			Th/U	²⁰⁷Pb/²³⁵U±1σ		²⁰⁶Pb/²³⁸U±1σ		²⁰⁷Pb/²³⁵U±1σ		²⁰⁶Pb/²³⁸U±1σ
B3010-1流纹质晶屑凝灰岩
1	26.42	873.70	521.94	1.67	0.220 51	0.029 45	0.020 20	0.000 26	202.33	24.50	128.91	1.63
2	22.92	579.24	625.63	0.93	0.457 51	0.066 36	0.027 00	0.002 21	382.53	46.26	171.74	13.88
3	10.72	263.49	296.81	0.89	0.210 72	0.019 32	0.019 13	0.000 47	194.16	16.21	122.15	2.95
4	19.25	446.74	611.67	0.73	0.138 47	0.004 77	0.018 72	0.000 25	131.68	4.25	119.55	1.56
5	33.41	755.10	551.54	1.37	0.836 00	0.131 94	0.023 14	0.000 87	616.94	73.10	147.50	5.50
6	14.87	279.48	494.90	0.56	0.128 69	0.004 94	0.019 01	0.000 23	122.92	4.44	121.40	1.48
7	17.43	485.80	423.42	1.15	0.270 72	0.042 06	0.019 86	0.000 38	243.27	33.62	126.80	2.38
8	18.71	430.00	559.03	0.77	0.132 28	0.003 97	0.019 26	0.000 24	126.14	3.56	123.00	1.53
9	9.44	211.94	201.73	1.05	0.345 01	0.034 44	0.021 62	0.000 52	300.96	26.01	137.86	3.25
10	7.95	252.96	227.78	1.11	0.116 49	0.006 13	0.018 13	0.000 33	111.88	5.57	115.84	2.08
11	15.10	463.84	427.30	1.09	0.129 62	0.004 66	0.019 11	0.000 35	123.75	4.19	122.05	2.19
12	11.81	302.43	353.01	0.86	0.119 80	0.005 29	0.019 18	0.000 27	114.89	4.79	122.47	1.69
13	6.66	148.61	212.01	0.70	0.134 73	0.007 46	0.019 32	0.000 34	128.34	6.68	123.34	2.13
14	20.95	563.38	551.62	1.02	0.191 79	0.024 96	0.019 23	0.000 31	178.15	21.27	122.81	1.95
15	18.20	383.14	576.93	0.66	0.143 63	0.004 93	0.019 83	0.000 28	136.27	4.37	126.56	1.77
16	15.74	458.56	448.27	1.02	0.121 34	0.004 64	0.019 27	0.000 28	116.28	4.20	123.02	1.75
17	6.52	160.17	198.23	0.81	0.144 85	0.008 15	0.019 40	0.000 37	137.36	7.23	123.86	2.33
18	11.25	305.67	300.31	1.02	0.224 24	0.022 45	0.019 72	0.000 88	205.43	18.63	125.91	5.59
19	22.58	517.55	672.30	0.77	0.257 53	0.035 61	0.024 69	0.002 01	232.68	28.76	157.20	12.62
20	23.95	556.71	519.79	1.07	0.280 88	0.037 60	0.019 13	0.000 27	251.36	29.81	122.16	1.73
PM305-7-1流纹岩
1	13.13	273.17	414.94	0.66	0.125 82	0.005 10	0.019 59	0.000 35	120.33	4.60	125.04	2.23
2	26.95	667.94	600.81	1.11	1.807 89	0.346 21	0.055 81	0.009 75	1 048.31	125.84	350.12	59.56
3	25.65	718.56	721.55	1.00	0.131 66	0.004 11	0.019 18	0.000 25	125.59	3.69	122.46	1.61
4	55.80	1 168.73	1123.65	1.04	0.211 17	0.008 00	0.024 70	0.000 31	194.54	6.71	157.31	1.93
5	4.53	78.58	102.47	0.77	0.182 17	0.011 36	0.026 05	0.000 63	169.93	9.75	165.78	3.93
6	9.16	262.54	260.81	1.01	0.129 44	0.006 52	0.019 26	0.000 30	123.59	5.86	123.01	1.90
7	18.71	277.72	325.66	0.85	0.234 26	0.010 14	0.030 83	0.000 69	213.71	8.34	195.72	4.34
8	19.08	120.09	772.49	0.16	0.131 59	0.006 64	0.019 40	0.000 30	125.52	5.96	123.88	1.91
9	17.13	228.77	272.92	0.84	0.251 77	0.009 29	0.036 14	0.000 50	228.01	7.54	228.86	3.13
10	21.52	356.01	283.78	1.25	0.303 47	0.013 41	0.037 63	0.000 55	269.11	10.45	238.10	3.42
11	13.14	168.64	195.10	0.86	0.278 01	0.010 59	0.038 71	0.000 56	249.08	8.42	244.86	3.47
12	27.04	563.15	406.23	1.39	0.224 06	0.007 58	0.032 31	0.000 41	205.28	6.29	204.97	2.59
13	50.44	770.66	839.23	0.92	0.229 11	0.005 97	0.033 04	0.000 45	209.46	4.93	209.54	2.78
14	15.23	394.24	483.86	0.81	0.126 95	0.004 63	0.018 35	0.000 29	121.36	4.17	117.23	1.81
15	17.74	513.29	444.30	1.16	0.207 85	0.009 46	0.019 11	0.000 27	191.75	7.96	122.00	1.72
16	10.10	324.87	280.22	1.16	0.115 63	0.005 59	0.019 26	0.000 33	111.10	5.09	122.98	2.11
17	16.69	472.54	484.52	0.98	0.139 32	0.005 41	0.019 71	0.000 38	132.44	4.82	125.84	2.41
18	76.21	1 055.13	2 204.96	0.48	0.171 33	0.005 57	0.025 13	0.000 48	160.58	4.83	160.02	3.03
19	9.66	128.70	149.69	0.86	0.240 29	0.010 16	0.038 46	0.000 76	218.66	8.32	243.27	4.71
20	22.60	516.18	733.96	0.70	0.135 40	0.004 62	0.019 57	0.000 31	128.93	4.13	124.93	1.94

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表 2 内蒙古敖汉地区及周边火山岩年龄

Table 2. Dating of volcanic rocks in Aohan area and its surrounding areas, Inner Mongolia

样号	年龄（Ma）	测试方法	岩性（矿物）	采样地点	层位	资料来源
PM109-8-1	127.7±1.8	U-Pb（LA-ICP-MS）	流纹岩	马场	义县组二段	陈井胜等，2015a
D1034-1	124.3±1.8	U-Pb（LA-ICP-MS）	流纹岩	马场	义县组二段
D3014	122.3±1.4	U-Pb（LA-ICP-MS）	黑曜岩	马场	产于义县组二段的脉体（火山通道相）
PM113-8-1	121.8±1.3	U-Pb（LA-ICP-MS）	英安岩	马场	义县组三段
D2060	114.9±1.8	U-Pb（LA-ICP-MS）	粗安岩	马场	义县组三段
PM202-13-3	160.8±1.9	U-Pb（LA-ICP-MS）	流纹岩	敖汉旗	张家口组	陈井胜等，2015b
PM401-11-1	130.8±1.7	U-Pb（LA-ICP-MS）	安山岩	敖汉旗	义县组一段
D2211	124.7±1.2	U-Pb（LA-ICP-MS）	安山岩	敖汉旗	义县组一段
D2399	121.6±2.8	U-Pb（LA-ICP-MS）	流纹质晶屑熔结凝灰岩	敖汉旗	义县组二段
TW01	123.6±1	U-Pb（LA-ICP-MS）	安山岩	敖汉旗	义县组	李伟等，2018
TW02	124.4±0.68	U-Pb（LA-ICP-MS）	安山岩	敖汉旗	义县组	李伟等，2018
PM305-7-1	122.8±2.3	U-Pb（LA-ICP-MS）	安粗岩（薄片）	敖汉旗	义县组	本文
B3010-1	122.1±1.9	U-Pb（LA-ICP-MS）	流纹质晶屑凝灰岩	敖汉旗	义县组	本文
B2003-1	123.4±2.1	U-Pb（LA-ICP-MS）	安山岩	敖汉旗	义县组	未发表
B1015-1	124.0±1.9	U-Pb（LA-ICP-MS）	安山岩	敖汉旗	义县组	未发表
	119	全岩K-Ar	流纹岩	敖汉旗	满克头鄂博组一段	①
YX-210	124.4±1.4	U-Pb（LA-ICP-MS）	流纹岩	凌源	义县组	孟凡雪等，2008
YX277	125.4±0.9	U-Pb（LA-ICP-MS）	凝灰岩	凌源	大王杖子层下部	张宏等，2006
YX278	125.3±0.9	U-Pb（LA-ICP-MS）	流纹岩	凌源	大王杖子层之上
YX279	124.4±1.1	U-Pb（LA-ICP-MS）	流纹岩	凌源	大王杖子层之上
41017-2	122.3±2.1	U-Pb（LA-ICP-MS）	凝灰岩	凌源	大王杖子层上部
YX281	123±1.7	U-Pb（LA-ICP-MS）	流纹岩	凌源	大王杖子层之上
XL31	159±3	U-Pb	流纹岩（岩脉）	辽西北票	兴隆沟组	Gao et al., 2004
XL34	159±4	U-Pb	流纹岩（岩脉）	辽西北票	兴隆沟组	Gao et al., 2004
HFG27	160±6	U-Pb（SHRIMP）	流纹岩	辽西北票	髫髻山组中部	Yang and Li(2008)
BPC-15	159.4±3.4	U-Pb（LA-ICP-MS）	安山质角砾熔岩	辽西北票	髫髻山组上部	马强和郑建平，2009
CF31-Tw26	161±1	U-Pb（LA-ICP-MS）	流纹岩	赤峰北	满克头鄂博组	郝彬等，2016
CF16-Tw18	150±1	U-Pb（LA-ICP-MS）	流纹岩	赤峰北	满克头鄂博组	郝彬等，2016
Z1001	156±2	U-Pb（LA-ICP-MS）	流纹岩	赤峰北	满克头鄂博组	杨扬等，2012
D0357	157±3	U-Pb（LA-ICP-MS）	流纹岩	赤峰北	满克头鄂博组	杨扬等，2012
注：①为辽宁地质局第二区域地质测量队, 1970, 敖汉旗幅1:20万区域地质矿产报告.

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