应用电感耦合等离子体质谱法研究西藏甲玛超大型铜多金属矿床辉钼矿稀土元素和微量元素地球化学特征

应立娟; 林彬; 王立强; 李超; 王阔

doi:10.15898/j.cnki.11-2131/td.2015.03.018

应用电感耦合等离子体质谱法研究西藏甲玛超大型铜多金属矿床辉钼矿稀土元素和微量元素地球化学特征

应立娟^1,2,,
林彬²,
王立强²,
李超³,
王阔⁴

1.
长安大学地球科学与资源学院, 陕西西安 710064
2.
国土资源部成矿作用与资源评价重点实验室, 中国地质科学院矿产资源研究所, 北京 100037
3.
国家地质实验测试中心, 北京 100037
4.
中国地质大学地球科学与资源学院, 北京 100083

基金项目:

国家自然科学青年基金项目(41302058);中国科技部重大仪器专项(2011YQ050069);中国地质大调查项目(12120114019401)

详细信息

作者简介:
应立娟, 博士, 副研究员, 主要从事矿床学研究. E-mail: biyuntian518@sina.com.

中图分类号: P597.3;O657.63
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出版历程
- 收稿日期: 2015-04-14
- 修回日期: 2015-05-11
- 录用日期: 2015-05-24
- 发布日期: 2015-03-24

ICP-MS Analysis of Rare Earth Elements and Trace Elements of Molybdenite in the Jiama Super-large Copper Polymetallic Deposit, Tibet

1.
The School of Earth Science and Resources, Chang'an University, Xi'an 710064, China
2.
Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Land and Resources; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
National Research Center for Geoanalysis, Beijing 100037, China
4.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

摘要

摘要: 西藏甲玛超大型铜多金属矿床的钼资源量大于100万吨, 辉钼矿是最主要的钼矿物。本文应用电感耦合等离子体质谱法(ICP-MS)分析了不同期次辉钼矿, 研究其稀土元素和微量元素的地球化学特征, 以指示成矿流体的来源与性质, 探讨其成矿机制。结果表明, 辉钼矿的稀土元素总量(39.34~168.1 μg/g)与斑岩、矽卡岩的稀土元素总量相似, 富集轻稀土, 且从早到晚总量增加, 指示流体源自于岩浆。辉钼矿具有明显的Eu、Ce负异常和Sm正异常, 其中Eu负异常指示流体的还原性质; Cu、Pb、Zn等成矿元素含量较高, 指示流体中成矿元素的富集。
- 甲玛 /
- 辉钼矿 /
- 稀土元素 /
- 微量元素 /
- 电感耦合等离子体质谱法
Abstract: The Jiama super-large copper polymetallic deposit has molybdenum resources in excess of one million tons, and molybdenite is the most important molybdenum mineral. Rare earth elements (REEs) and trace elements of molybdenite from different stages were analyzed by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) in order to understand the source and nature of ore-forming fluids. Molybdenite contains REE contents ranging from 39.34 to 168.1 μg/g, which is similar to those of porphyry and skarn deposits at Jiama. From early to late stage, REE contents of molybdenite increase and light rare earth elements are relatively enriched, indicating the ore-forming fluids might be derived from magma. Molybdenite shows REE patterns with negative Eu and Ce anomalies, and positive Sm anomaly. Negative Eu anomaly suggest that the ore-forming fluids are relatively reduced. Molybdenite contains high Cu, Pb, Zn, Bi indicating the enrichment of these elements in fluids.
- Jiama /
- molybdenite /
- rare earth elements /
- trace elements /
- Inductively Coupled Plasma-Mass Spectrometry

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图 1 西藏甲玛矿床地质简图及采样位置

Figure 1. Geological map and sampling locations of the Jiama deposit, Tibet

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图 2 甲玛不同成矿阶段不同产状辉钼矿

a—成矿早期矽卡岩中细粒浸染状辉钼矿(Mol，JM3110-193); b—成矿早期矽卡岩中细粒辉钼矿(JM6405-173.3); c—成矿主期二长花岗斑岩石英脉中粗粒辉钼矿(JM2010-653.9); d—成矿晚期角岩中辉钼矿细脉(JM1618-176.21); e—片状辉钼矿(JM1616-196.5); f—角岩中鳞片状辉钼矿集合体(JM007-165.23); g—矽卡岩中片状辉钼矿(JM2409-455.85); h—矽卡岩石榴子石颗粒间充填的辉钼矿(JM807-227.66)

Figure 2. Molybdenite with different occurrences at the Jiama's different Metallogenic stages

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图 3 甲玛不同含矿围岩中辉钼矿稀土元素配分曲线和微量元素蛛网图

邦铺二长花岗斑岩中辉钼矿的数据引自文献[7]；稀土球粒陨石标准化值参考文献[14]；微量元素原始地幔标准化值参考文献[15]。

Figure 3. REEs pattern and spider diagram of molybdenite in the Jiama deposit, Tibet

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表 1 西藏甲玛矿床辉钼矿稀土元素含量及其主要特征值

Table 1 Rare earth element concentration (ppm) and feature values of the molybdenite in the Jiama deposit, Tibet

稀土元素	矽卡岩(μg/g)		二长花岗斑岩(μg/g)		角岩(μg/g)
稀土元素	JM711 -103.7	JM6405 -171.3	JM2010 -653.1	JM2010 -662.5	JM1618 -163.76	JM1618 -179.1
La	5.634	4.302	0.258	1.774	33.08	15.08
Ce	12	10.06	1.179	3.412	58.7	27.62
Pr	2.248	1.696	3.512	2.85	8.402	5.409
Nd	9.976	8.769	15.02	12.01	30.29	20.44
Sm	6.659	4.466	37.54	27.7	29.56	27.83
Eu	0.255	0.855	0.047	0.040	1.045	0.483
Gd	1.492	2.966	0.020	0.024	1.985	1.348
Tb	0.241	0.474	0.332	0.288	0.515	0.474
Dy	1.643	2.719	2.08	1.607	2.511	2.766
Ho	0.376	0.54	0.722	0.564	0.682	0.766
Er	0.972	1.303	0.756	0.522	0.918	1.009
Tm	0.138	0.166	0.073	0.065	0.106	0.106
Yb	0.903	0.883	0.044	0.029	0.282	0.266
Lu	0.144	0.142	0.007	0.004	0.048	0.037
∑REEs	42.68	39.34	61.59	50.89	168.1	103.6
LREEs/HREEs	6.223	3.28	14.27	15.4	22.86	14.3
(La/Yb)_N	4.206	3.285	3.953	41.24	79.09	38.22
(La/Sm)_N	0.532	0.606	0.004	0.04	0.704	0.341
(Gd/Lu)_N	1.288	2.596	2.355	0.759	5.14	4.531
δEu	0.248	0.718	0.168	0.148	0.417	0.241
δCe	0.812	0.896	0.298	0.365	0.847	0.736
δSm	4.494	1.757	47.867	43.214	5.658	9.543
注: δEu=Eu_N/(Sm_NGd_N)^1/2；δCe=Ce_N/(La_NPr_N)^1/2；δSm=Sm_N/(Nd_N*Eu_N)^1/2

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表 2 西藏甲玛矿床辉钼矿微量元素含量及其主要特征值

Table 2 Trace element concentration and feature values of the molybdenite in the Jiama deposit, Tibet

微量元素	矽卡岩(μg/g)		二长花岗斑岩(μg/g)		角岩(μg/g)
微量元素	JM711 -103.7	JM6405 -171.3	JM2010 -653.1	JM2010 -662.5	JM1618 -163.76	JM1618 -179.1
Li	1.577	6.36	0.249	0.61	3.165	1.996
Be	0.131	0.173	0.021	0.094	0.194	0.329
Sc	2.43	4.504	0.457	0.753	1.886	1.033
Ti	445.3	3883	28.82	32.56	43.77	57.51
V	95.29	65.4	32.16	37.42	53.18	40.06
Cr	67.23	267.9	2.027	44.43	37.66	19.34
Mn	1510	1508	1.632	9.716	84.75	78.61
Co	29.13	23.11	1.036	1.512	1.96	3.336
Ni	573.2	335.2	8.19	9.593	12.4	18.08
Cu	6060	3320	10.74	11.09	25.06	29.17
Zn	2404	2626	5.66	13.02	13.34	24.71
Ga	5.286	4.285	0.143	0.352	1.739	1.564
Ge	1.759	0.95	1.57	1.574	1.864	1.41
As	63.47	135.2	7.616	3.539	8.797	11.41
Rb	0.878	3.173	1.563	3.035	1.48	29.46
Sr	5.562	7.475	0.686	1.079	16.27	6.978
Y	9.78	14.24	1.074	0.542	5.257	4.953
Zr	9.26	26.16	0.106	0.142	0.15	0.603
Nb	13.43	13.96	4.385	4.471	4.318	5.654
Rh	1.139	1.164	1.134	1.1	1.118	1.126
Cd	471.9	486.4	713.1	772	693	778.7
Sn	33.04	57.82	0.572	0.733	0.8	0.947
Sb	6.253	8.649	0.19	0.115	0.667	1.275
Cs	0.479	2.784	0.336	0.575	0.54	6.24
Ba	18.58	2.796	4.144	3.633	38.2	23.31
Hf	0.42	1.567	0.009	0.013	0.016	0.023
Ta	0.012	0.028	0.006	0.005	0.01	0.006
W	240.3	13.05	36.88	31.69	85.48	196.2
Re	0.074	0.03	0.129	0.142	0.024	0.024
Tl	2.035	22.81	0.108	0.151	0.333	5.42
Pb	910.6	2446.1	516.6	465.1	121.4	227.6
Bi	653.7	233.5	54.74	31.04	5.544	48.57
Th	2.375	4.441	0.309	2.902	2.638	3.416
U	0.413	1.568	43.71	1.758	0.408	0.249
总量	13639	15528	148.1	1486.5	1267	1629
Hf/Sm	0.0631	0.3509	0.0002	0.0005	0.0005	0.0005
Nb/La	2.384	3.245	16.996	2.52	0.131	0.375
Th/La	0.422	1.032	1.198	1.636	0.08	0.227
Co/Ni	0.051	0.069	0.126	0.158	0.158	0.185

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施引文献(5)

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