阿尔金北缘古元古代壳源火成碳酸岩的发现

杨俊泉; 万渝生; 刘永顺; 辛后田; 张素荣; 李名则

doi:10.3799/dqkx.2012.101

阿尔金北缘古元古代壳源火成碳酸岩的发现

doi: 10.3799/dqkx.2012.101

杨俊泉^{1, 2,},
万渝生^3, ,,
刘永顺²,
辛后田²,
张素荣²,
李名则¹

1.
中国地质大学地球科学与资源学院, 北京 100083
2.
天津地质矿产研究所, 天津 300170
3.
中国地质科学院地质研究所北京离子探针中心, 北京 100037

基金项目:

中国地质调查局J46C001002(石棉矿幅)1∶25万区域地质调查(修测)项目 200413000006

详细信息

作者简介:
杨俊泉(1980-), 助理研究员, 从事岩石学研究.E-mail: dap-yangjunquan@163.com

通讯作者:
万渝生, E-mail: wanyusheng@bjshrimp.cn

中图分类号: P588.15
计量
- 文章访问数: 249
- HTML全文浏览量: 120
- PDF下载量: 7
- 被引次数: 0
出版历程
- 收稿日期: 2011-10-22
- 网络出版日期: 2021-11-10
- 刊出日期: 2012-09-15

Discovery of Paleoproterozoic Crustally Derived Carbonatite in the Northern Altyn Tagh

1.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083
2.
Tianjin Institute of Geology and Mineral Resources, Tianjin 300170
3.
Beijing SHRIMP Center, Insitute of Geology, Chinese Academy of Geological Sciences, Beijing 100037

摘要

摘要: 报道了阿尔金东段北缘的古元古代晚期壳源火成碳酸岩全岩地球化学和锆石SHRIMP定年结果.它们明显切割围岩, 以岩株状、岩脉状产出, 包裹不同类型围岩包体.岩石主要由方解石、透辉石组成, 含石英、长石等长英质矿物.岩石高CaO(20.56%~39.80%), SiO₂含量变化较大(23.33%~54.06%), 稀土总量低(TREE=28.36×10^-6~63.01×10^-6)、弱负铕异常(Eu/Eu^*=0.69~0.83)、轻重稀土分离不强((La/Yb)_N=9.20~16.85), 相对富集大离子亲石元素Sr、Rb、Ba、Th, 亏损高场强元素Nb、Ti、P.锆石具核-边结构, 边部锆石普遍存在不明显的环带, 具变质深熔锆石的结构特征, 其²⁰⁷Pb/²⁰⁶Pb加权平均年龄为1 931±18 Ma.它们是高级变质作用条件下米兰岩群不纯大理岩深熔作用的产物.
- 火成碳酸岩 /
- 地质年代学 /
- 地球化学 /
- 岩石学 /
- 阿尔金北缘
Abstract: This paper reports whole-rock geochemical compositions and zircon dating results of late Paleoproterozoic crustally-derived carbonatite in the northern Altyn Tagh. The carbonatite cuts contry rocks and occurs as stocks or dikes and contains different types of contry rocks. It is mainly composed of calcite, diopside, and a few silicate minerals (such as, feldspar, quartz, etc.). Samples of the carbonatite are characterized with high CaO contents (20.56%-39.80%), a large range of SiO₂ contents (23.33%-54.06%), low TREE (28.36×10^-6-63.01×10^-6), weakly negative Eu anomalies (Eu/Eu^*=0.69-0.83), moderately fractionated REE patterns ((La/Yb)_n=9.20-16.85). Compared with Sr, Rb, Ba, Th (LILE), the high field strength elements (HFSE), especially Nb, Ti and P, are strongly depleted. Zircons of the carbonatite show core-rim textures, and commonly show weakly zoning. SHRIMP U-Pb zircon dating result of the carbonatites is 1 931±18 Ma. All these threw lights on that the carbonatite are formed by the anatexis of impure marbles from Milan group.
- derived carbonatite /
- geochronology /
- geochemical geochemistry /
- Petrology /
- northern Altyn Tagh

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图 1 阿尔金北缘地质简图示火成碳酸岩的分布(据拉配泉地区基岩区侵入岩分布图改编；刘永顺等，2010)

Fig. 1. Sketched geological map of the northern Altyn Tagh showing carbonatite distribution

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图 2 阿尔金北缘火成碳酸岩野外照片

a.火成碳酸岩侵入英云闪长质片麻岩; b.火成碳酸岩与围岩片麻状闪长岩的接触带呈强变形特征; c.火成碳酸岩与围岩斜长角闪岩的接触带呈强变形特征；d.火成碳酸岩呈分支脉状切割米兰岩群斜长角闪岩; e.火成碳酸岩切割石榴黑云斜长片麻岩和斜长角闪岩，接触界线波状不平; f.火成碳酸岩中长条状英云闪长质片麻岩包体，有碳酸岩岩脉侵入切割包体; g.火成碳酸岩中椭圆状英云闪长质片麻岩包体，相互之间存在反应; h.火成碳酸岩中不同形态的片麻状闪长岩包体，片麻理方向不同

Fig. 2. Field features of carbonatites in the northern Altyn Tagh

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图 3 阿尔金北缘碳酸岩地球化学图谱

a.稀土配分曲线；b.微量元素蛛网图; 标准化数据分别取自Boynton(1984)和Pearce(1982)

Fig. 3. REE pattern (a) and trace element spider diagram (b) of carbonatite in the northern Altyn Tagh

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图 4 阿尔金北缘火成碳酸岩(TW1119-1)的锆石透射光图像

Fig. 4. Plane polarized light images of zircons from carbonatite in the northern Altyn Tagh

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图 5 阿尔金北缘火成碳酸岩(TW1119-1)的锆石阴极发光图像

图中圆圈为锆石SHRIMP U-Pb测年位置，其编号与表 2中的一致

Fig. 5. Cathodoluminescence images of zircons from carbonatite in the northern Altyn Tagh

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图 6 阿尔金北缘火成碳酸岩(TW1119-1)的锆石SHRIMP U-Pb年龄谐和图

Fig. 6. Concordia diagram of U-Pb SHRIMP data of zircons from carbonatite in the northern Altyn Tagh

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表 1 阿尔金北缘古元古代火成碳酸岩元素组成

Table 1. Chemical compositions of carbonatite in the northern Altyn Tagh

样号	Bb1119-1	P15Bb29-1	P15Bb18-1	D1291-1Gs^*	P7Bb4-1
SiO₂	54.06	40.19	29.44	28.36	23.33
TiO₂	0.27	0.24	0.32	0.25	0.12
Al₂O₃	5.44	4.37	5.28	4.1	1.63
Fe₂O₃	0.83	0.16	0.1	-	0.11
FeO	2.02	1.78	2.71	1.39	0.84
MnO	0.05	0.03	0.03	0.02	0.06
MgO	2.56	3.32	2.78	1.94	1.37
CaO	20.56	29.78	36.30	36.56	39.80
Na₂O	0.77	0.76	0.49	0.45	0.29
K₂O	0.75	0.86	0.64	0.65	0.31
P₂O₅	0.02	0.06	0.09	0.07	0.07
LOI	11.69	17.76	21.94	25.36	31.46
La	8.05	12.6	12.5	8.49	6.08
Ce	15.8	24.7	23.6	13.7	11.1
Pr	1.74	2.67	2.44	1.59	1.13
Nd	6.31	9.65	8.51	5.64	4.19
Sm	1.21	1.66	1.46	0.98	0.78
Eu	0.26	0.35	0.32	0.27	0.16
Gd	0.91	1.39	1.12	0.98	0.53
Tb	0.15	0.24	0.18	0.13	0.09
Dy	0.97	1.27	1.05	0.83	0.52
Ho	0.18	0.23	0.19	0.17	0.1
Er	0.6	0.72	0.56	0.47	0.31
Tm	0.08	0.09	0.08	0.08	＜0.05
Yb	0.59	0.61	0.5	0.44	0.31
Lu	0.08	0.09	0.09	0.08	＜0.05
Y	4.82	6.74	5.43	4.61	2.98
TREE	41.75	63.01	58.03	38.46	28.36
σEu	0.73	0.69	0.74	0.83	0.72
(La/Yb)_N	9.2	13.93	16.85	13.01	13.22
Ba	227	241	243	251	97.7
Rb	24.9	29.4	14.1	17.3	13.1
Sr	646	1089	1154	1648	909
Zr	50.5	51.7	34.3	60.7	34.2
Nb	2.71	3.03	3.5	2.47	1.27
Th	1.54	2.58	2.43	2.16	1.86
Pb	4.67	12.6	8.43		4.13
Zn	55.5	44.7	70.9		15.3
Cu	11.9	9.66	12.1		3.46
Ni	28.2	29.6	31.2		24
V	59.2	35.6	47.2		16.8
Cr	61.5	34.5	35.7	77.8	14.4
Hf	1.52	1.34	1.02	1.58	0.74
Sc	9.85	6.6	7.8	4.74	3.26
Ta	0.23	0.14	0.29	0.17	0.09
Co	9.6	9.33	13.4		5.84
Li	7.5	12	8.6		1.94
U	1.36	2.11	1.52	2.15	1.38
*引自拉配泉地区1∶5万区调报告; 常量元素单位为%，稀土和微量元素单位为10^-6.

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表 2 阿尔金北缘火成碳酸岩(Tw1119-1)锆石SHRIMP U-Pb年龄

Table 2. U-Pb SHRIMP data of zircons from carbonatite in the northern Altyn Tagh

点号	w_B/(μg·g^-1)			Th/ U	同位素原子比率						误差相关	表面年龄(Ma)
点号	²⁰⁶Pb^*	U	Th	Th/ U	²⁰⁷Pb^/²⁰⁶Pb^	±%	²⁰⁷Pb^*/²³⁵U	±%	²⁰⁶Pb^*/238U	±%	误差相关	²⁰⁶Pb/²³⁸U	²⁰⁷Pb/²⁰⁶Pb
1.1ME	117	395	53	0.14	0.122 22	0.55	5.78	3.9	0.343	3.8	0.99	1 901±63	1 989± 9.9
2.1IN	98.9	308	51	0.17	0.144 06	0.56	7.42	3.5	0.374	3.4	0.987	2047±60	2 277± 10
3.1IN	240	790	281	0.37	0.144 93	0.37	7.04	3.4	0.353	3.4	0.994	1 947±57	2 287± 6.3
4.1IN	169	450	158	0.36	0.168 2	0.68	10.1	3.5	0.436	3.4	0.981	2 331±67	2 540±11
5.1IN	130	461	72	0.16	0.163 46	0.44	7.39	3.4	0.328	3.4	0.992	1 828±54	2 492± 7.3
5.2ME	196	612	23	0.04	0.108 1	3.3	5.56	4.7	0.373	3.4	0.72	2 044±60	1 768±60
6.1ME	243	984	53	0.06	0.120 3	0.44	4.77	3.4	0.2876	3.4	0.992	1 630±49	1 961±7.8
7.1ME	176	511	56	0.11	0.119 17	0.46	6.58	3.4	0.4	3.4	0.991	2 171±63	1 944± 8.2
8.1ME	110	421	45	0.11	0.119 02	0.56	4.99	3.9	0.304	3.9	0.99	1 712±59	1 942±10.0
9.1ME	73.1	241	22	0.09	0.108 4	2.5	5.27	4.2	0.352	3.4	0.813	1 946±58	1 773±45
10.1ME	122	413	41	0.10	0.114 8	0.6	5.45	3.5	0.344	3.4	0.985	1 907±57	1 877±11
10.2ME	212	685	70	0.11	0.112 3	1.3	5.58	3.6	0.36	3.4	0.932	1 983±58	1 837±24
11.1ME	147	513	44	0.09	0.116 5	0.5	5.37	3.4	0.334	3.4	0.989	1 858±55	1 903±9.0
12.1ME	134	443	44	0.10	0.117 57	0.52	5.73	3.4	0.353	3.4	0.988	1 951±57	1 920±9.4
13.1ME	102	341	42	0.13	0.123 3	0.84	5.93	3.5	0.349	3.4	0.971	1 929±57	2 005±15
14.1ME	227	714	44	0.06	0.118 01	0.5	6.01	3.4	0.369	3.4	0.989	2 026±59	1 926±8.9
15.1ME	174	542	43	0.08	0.117 44	0.43	6.06	3.4	0.375	3.4	0.992	2 051±60	1 918±7.7
16.1ME	135	499	53	0.11	0.115 74	0.49	5.01	3.5	0.314	3.4	0.99	1 760±53	1 892±8.9
17.1IN	199	580	93	0.17	0.143 85	0.59	7.92	3.7	0.399	3.6	0.987	2 165±66	2 274±10
注：误差为1σ；Pb^*指示放射成因铅；所有同位素比率已对测得的²⁰⁴Pb进行了校正.样品数据由地科院北京离子探针中心测试.

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