应用电感耦合等离子体质谱技术研究牦牛坪矿床霓长岩化蚀变矿物微量元素特征

郭东旭; 刘琰; 李自静; 孙东询; 王浩

doi:10.15898/j.cnki.11-2131/td.202005060003

应用电感耦合等离子体质谱技术研究牦牛坪矿床霓长岩化蚀变矿物微量元素特征

1.
自然资源实物地质资料中心, 河北三河 065201

2.
中国地质科学院地质研究所, 北京 100037

基金项目:
中国地质调查局地质调查项目“实物地质资料汇集与服务”（DD20190411）；国家自然资源部中国地质调查局勘测计划（DD20190060）

详细信息

作者简介: 郭东旭, 硕士, 助理工程师, 研究方向为矿物学、岩石学、矿床学。E-mail:gdx2016@163.com

通讯作者: 刘琰, 博士, 研究员, 从事稀有金属、稀土元素矿床研究。E-mail:ly@cags.ac.cn

中图分类号: O657.63

收稿日期: 2020-04-30

修回日期: 2020-07-07

录用日期: 2020-09-19

Determination of Trace Element Compositions of Altered Minerals in Fenitization Veins by Inductively Coupled Plasma-Mass Spectrometry

1.
Core and Samples Center of Land and Resources, China Geological Survey, Sanhe 065201, China

2.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

More Information

Corresponding author: Yan LIU, ly@cags.ac.cn

Received Date: 30 April 2020

Revised Date: 07 July 2020

Accepted Date: 19 September 2020

摘要

摘要: 近年来全岩电感耦合等离子体质谱（ICP-MS）和原位激光剥蚀电感耦合等离子体质谱（LA-ICP-MS）微量元素地球化学测试在地球科学领域的应用越来越广泛。霓长岩化是碳酸岩型稀土矿常见的蚀变类型，但其中的蚀变矿物微量元素特征与稀土矿化关系并不清楚。本文对川西牦牛坪矿床两期霓长岩化脉（无矿脉和含矿脉）中的霓辉石、钠铁闪石同时开展ICP-MS和LA-ICP-MS微量元素测试。结果表明：同期次的霓长岩化脉中，霓辉石、钠铁闪石全岩ΣREE含量远高于单矿物原位ΣREE含量，背散射图像显示霓辉石、钠铁闪石矿物中叠加了一些氟碳铈矿、重晶石微矿物。不同期次霓长岩化脉中霓辉石原位微量对比，含矿脉中的霓辉石具有更高的La/Nd值（0.19~0.23）、LREE/HREE值（6.58~7.79）、Ce/Nd值（0.95~1.11）、La_N/Yb_N值（2.07~2.33）。对比全岩微量组成，含矿脉中高含量的La、Ce、LREE、ΣREE，强烈的轻重稀土分异，可能代表了高稀土通量的霓长岩化流体。霓长岩化脉的出现以及脉体中霓辉石、钠铁闪石这些全岩微量、原位微量地球化学指标，可为碳酸岩型稀土矿床找矿勘查提供参考。
- 牦牛坪 /
- 霓长岩化 /
- 蚀变 /
- 微量元素 /
- 霓辉石 /
- 钠铁闪石
Abstract: BACKGROUNDIn recent years, whole-rock inductively coupled plasma-mass spectrometry (ICP-MS) trace and in situ laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) trace element analyses have been increasingly more widely used in the field of earth sciences. Fenitization is a common type of alteration in carbonate-type rare earth deposits, but the relationship between the trace element characteristics of altered minerals and rare earth mineralization is not clear. OBJECTIVESTo better understand the relationship between fenitization and REE mineralization in the Maoniuping deposit as well as to provide references for prospecting carbonate-related (including alkaline rock) REE deposits. METHODSTrace elements for aegirine-augite and arfvedsonite in different stages of fenitization veins (ore-bearing or barren rocks) from the Maoniuping deposit, Dagudao area were analyzed by ICP-MS and LA-ICP-MS. RESULTSIn situ trace elements of aegirine-augite in different stages of fenitization veins showed that La/Nd (0.19-0.23), LREE/HREE (6.58-7.79), Ce/Nd (0.95-1.11), (La)_N/(Yb)_N (2.07-2.33) values of aegirine-augite in ore-bearing veins were higher than those of barren veins. CONCLUSIONSCompared with whole rock trace elements, high contents of La, Ce, LREE, ΣREE in mineral veins, strong differentiation of light and heavy rare earths may represent fenitization-related fluid with high rare earth flux. The occurrence of fenitization veins and the whole-rock trace and in situ trace geochemical indicators of aegirine-augite in veins may provide references for the prospecting and exploration of carbonate-type rare earth deposits.
- Maoniuping /
- fenitization /
- alteration /
- trace elements /
- aegirine-augite /
- arfvedsonite

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图 1 牦牛坪矿床不同期次的霓长岩化脉

Figure 1.

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图 2 牦牛坪矿床不同期次的霓长岩化脉体中霓辉石、钠铁闪石全岩和原位微量元素组成^[38]

Figure 2.

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图 3 牦牛坪矿床不同期次的霓长岩化脉中霓辉石和钠铁闪石矿物内部微矿物颗粒

Figure 3.

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图 4 牦牛坪矿床不同期次的霓长岩化脉体中霓辉石原位微量元素数据特征

Figure 4.

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表 1 牦牛坪矿床不同期次的霓长岩化脉体中霓辉石、钠铁闪石全岩微量元素组成

Table 1. Total trace elements compositions of aegirine-augite and arfvedsonite in different period fenitization veins from the Maoniuping deposit, analyzed by ICP-MS

元素	霓辉石(×10^-6)		钠铁闪石(×10^-6)		霓辉石(×10^-6)		钠铁闪石(×10^-6)
元素	BAgt1	BAgt2	BArf1	BArf2	HAgt1	HAgt2	HArf1	HArf2
Ti	843	564	216	395	1645	589	489	162
Rb	72.1	13.0	28.9	63.9	97.4	9.84	160	11.8
Sr	173	155	1039	619	114	605	272	1531
Ba	2214	1592	3563	36100	3639	14690	86220	805
Zr	168	118	14.4	28.7	150	169	17.2	13.5
Nb	19.5	12.7	4.21	6.76	47.4	17.7	31.7	3.00
La	71.5	192	27.1	925	572	614	13120	1144
Ce	115	296	53.1	1136	838	879	17170	1270
Pr	16.7	32.7	7.83	103	81	82.9	1401	105
Nd	68.4	116	39.2	312	249	267	3798	293
Sm	14.4	17.3	9.42	33.0	32.2	30.3	267	27.7
Eu	3.74	4.01	2.75	8.44	6.96	6.31	40.4	5.51
Gd	11.1	10.6	9.97	15.1	16.6	14.2	45.8	13.3
Tb	1.46	1.34	1.22	2.31	2.24	1.69	6.42	1.84
Dy	7.24	6.53	6.00	12.5	11.3	8.32	43.5	9.80
Y	31.5	26.9	90.7	63.6	49.9	23.3	89.5	120
Ho	1.2	1.02	1.09	2.03	1.72	1.02	2.83	1.44
Er	3.51	2.83	2.94	5.66	4.89	2.65	2.74	3.57
Tm	0.59	0.48	0.38	0.91	0.78	0.46	0.71	0.46
Yb	4.31	3.78	2.14	5.69	5.36	3.83	5.91	2.64
Lu	1.00	0.87	0.37	1.02	1.11	0.98	1.33	0.44
Hf	12.3	10.9	1.06	1.95	10.5	11.3	2.10	0.90
Ta	0.06	0.07	0.07	0.08	0.86	0.14	0.26	0.05
Pb	308	56.5	47.5	209	316	240	484	236
Th	1.60	5.27	1.09	6.28	718	33.8	62.6	8.12
U	5.22	3.03	0.79	13.0	119	18.0	17.80	0.70
∑REE	320	685	164	2563	1823	1913	35906	2879
LREE	272	637	127	2476	1740	1843	35489	2812
HREE	9.41	7.96	5.83	13.28	12.14	7.92	10.69	7.11
LREE/HREE	28.91	80.03	21.78	186.45	143.33	232.70	3319.83	395.50
La_N/Yb_N	16.6	50.8	12.7	163	107	160	2220	433
注：LREE/HREE、La_N/Yb_N无单位。

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表 2 牦牛坪矿床不同期次的霓长岩化脉体中霓辉石、钠铁闪石原位微量元素组成

Table 2. In situ trace elements compositions of aegirine-augite and arfvedsonite in different period fenitization veins from the Maoniuping deposit, analyzed by LA-ICP-MS

元素	霓辉石(×10^-6)				钠铁闪石(×10^-6)				霓辉石(×10^-6)				钠铁闪石(×10^-6)
元素	La-BAgt1	La-BAgt2	La-BAgt3	La-BAgt4	La-BArf1	La-BArf2	La-BArf3	La-BArf4	La-HAgt1	La-HAgt2	La-HAgt3	La-HAgt4	La-HArf1	La-HArf2	La-HArf3	La-HArf4
Ti	292	298	305	313	400	420	507	255	692	488	658	653	484	312	438	249
Rb	0.04	0.06	0	0	6.9	7.58	5.79	8.17	0	0	0.05	0	6.01	7.85	7.03	8.10
Sr	194	181	187	194	97.1	105	104	105	182	167	169	158	54.9	98	96.3	94.1
Ba	0.03	0	0.14	0.05	1.09	0.85	0.86	0.79	0.26	0.44	0.01	0.38	7.15	3.07	4.96	4.99
Zr	167	164	128	133	13.7	10.0	14.8	9.70	144	124	141	155	31.9	12.2	11.5	11.1
Nb	0.16	0.15	0.29	0.16	2.60	1.04	2.23	0.37	0.34	0.2	0.41	0.36	3.96	0.63	1.42	0.51
La	10.2	9.16	8.88	9.32	2.60	2.62	2.48	2.32	9.52	8.94	9.42	11.7	1.95	2.49	2.50	2.49
Ce	49.3	44.4	44.9	46.4	10.5	10.3	9.52	9.03	47.5	43.9	45.7	56.9	9.22	9.86	9.73	9.68
Pr	9.20	8.75	8.55	8.61	1.67	1.54	1.63	1.44	8.48	8.1	7.85	11.1	1.61	1.49	1.54	1.49
Nd	50.6	48.0	45.8	48.4	7.90	6.77	6.86	6.57	45.7	42.1	41.1	60.1	7.70	7.04	7.39	6.78
Sm	11.2	11.6	10.4	11.2	1.37	1.25	1.24	1.32	9.33	8.42	8.42	12.7	1.61	1.63	1.44	1.07
Eu	2.86	2.73	2.73	2.69	0.37	0.31	0.31	0.27	2.28	2.16	2.01	3.35	0.50	0.29	0.39	0.29
Gd	7.91	7.11	7.05	7.23	0.71	0.83	0.63	0.81	5.64	5.80	5.07	9.23	1.11	0.71	0.85	0.75
Tb	0.87	0.91	0.80	0.80	0.11	0.07	0.10	0.08	0.60	0.64	0.55	1.05	0.13	0.09	0.10	0.06
Dy	4.61	4.34	4.08	4.06	0.55	0.37	0.49	0.37	3.26	3.24	3.12	5.62	0.73	0.50	0.43	0.36
Y	13.4	13.2	12.5	12.6	1.65	1.65	1.56	1.70	10.6	9.71	9.76	14.8	2.97	1.74	1.96	1.73
Ho	0.65	0.68	0.66	0.55	0.08	0.08	0.08	0.06	0.48	0.49	0.48	0.88	0.11	0.08	0.08	0.07
Er	1.68	1.95	1.45	1.60	0.27	0.20	0.20	0.31	1.55	1.30	1.15	2.11	0.31	0.21	0.33	0.39
Tm	0.37	0.35	0.30	0.35	0.08	0.09	0.08	0.08	0.27	0.25	0.24	0.36	0.08	0.08	0.09	0.09
Yb	4.29	4.04	3.65	3.6	0.99	1.24	1.37	1.35	3.22	3.08	3.27	3.61	0.84	1.35	1.14	1.11
Lu	1.23	1.10	0.91	0.97	0.30	0.35	0.36	0.31	0.82	0.69	0.81	0.84	0.20	0.36	0.34	0.32
Hf	12.2	12.2	9.67	9.88	1.02	0.90	1.10	0.49	11.2	12.0	10.9	11.1	8.02	1.08	1.25	0.68
Ta	0	0	0	0	0	0	0.02	0	0.02	0.02	0.03	0.01	0.11	0.01	0.04	0.02
Pb	2.62	2.37	2.21	2.37	3.92	3.11	4.04	3.30	2.23	2.11	1.98	1.95	3.56	3.38	3.94	5.94
Th	0.01	0.01	0.02	0.01	0	0	0	0	0.01	0.01	0.01	0.04	0.03	0	0	0
U	0	0	0.01	0.03	0	0	0	0	0	0	0	0.01	0.03	0.01	0.01	0.01
ΣREE	155	145	140	146	27.5	26.0	25.3	24.3	139	129	129	180	26.1	26.2	26.3	24.9
LREE	133	125	121	127	24.4	22.8	22.0	20.9	123	114	114	156	22.6	22.8	23.0	21.8
HREE	21.6	20.5	18.9	19.2	3.09	3.22	3.31	3.36	15.8	15.5	14.7	23.7	3.51	3.37	3.36	3.14
LREE/HREE	6.17	6.08	6.42	6.60	7.91	7.07	6.65	6.23	7.75	7.34	7.79	6.58	6.44	6.77	6.85	6.93
La_N/Yb_N	1.70	1.63	1.75	1.86	1.88	1.52	1.30	1.23	2.12	2.08	2.07	2.33	1.67	1.32	1.57	1.61
注：LREE/HREE、La_N/Yb_N无单位。

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