应用X射线荧光光谱-电感耦合等离子体质谱法研究湖南传梓源地区稀有金属矿床伟晶岩地球化学特征

文春华; 罗小亚; 李胜苗; 李建康

doi:10.15898/j.cnki.11-2131/td.2015.03.017

应用X射线荧光光谱-电感耦合等离子体质谱法研究湖南传梓源地区稀有金属矿床伟晶岩地球化学特征

1.
湖南省地质调查院, 湖南长沙 410116

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

基金项目: 中国地质调查局地质调查工作项目(1212011220817);湖南三稀资源综合研究与重点评价(资[2014]03-007-007)

详细信息

作者简介: 文春华, 博士, 工程师, 主要从事矿床地球化学及矿床成矿流体研究. E-mail: herowch2004@163.com.

中图分类号: O657.34;O657.63;P611.12

收稿日期: 2014-08-06

修回日期: 2015-05-09

录用日期: 2015-05-20

刊出日期: 2015-03-25

Application of X-ray Fluorescence Spectrometry and Inductively Coupled Plasma-Mass Spectrometry in the Geochemical Study of Rare Metal Deposits in Chuan-ziyuan Area, Hunan Province

1.
Hunan Institute of Geological Survey, Changsha 410116, 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

Received Date: 06 August 2014

Revised Date: 09 May 2015

Accepted Date: 20 May 2015

Publish Date: 25 March 2015

摘要

摘要:
本文利用X射线荧光光谱和电感耦合等离子体质谱分析技术对传梓源地区锂辉石伟晶岩、钠长石伟晶岩和钾长石伟晶岩开展研究, 获得三种类型伟晶岩地球化学特征。锂辉石伟晶岩具高Al₂O₃(16.23%~16.4%)、高K₂O(3.05%~5.22%)和高分异指数(DI=91.13~94.9), 微量元素富集Rb、K而亏损Ba、Sr、Ti, 稀土元素含量低(ΣREEs=2.9×10^-6~3.5×10^-6); 钠长石伟晶岩富Na₂O(5.58%~7.41%)而贫K₂O(0.98%~2.62%), 微量元素Rb/Sr值相对于锂辉石伟晶岩呈降低变化而稀土元素为升高变化; 钾长石伟晶岩富K₂O(9.13%)而贫Na₂O(1.69%), 微量元素Zr/Hf和K/Rb值相对于锂辉石伟晶岩和钠长石伟晶岩呈升高变化的特征。表明岩浆在演化过程中发生了不混溶作用、钠长石交代作用和钾长石交代作用, 分别形成了Li、Rb矿化锂辉石伟晶岩, Nb、Ta、Be矿化钠长石伟晶岩和无矿化钾长石伟晶岩, 这些地球化学特征是稀有金属矿床找矿地球化学标志。
- X射线荧光光谱法 /
- 电感耦合等离子体质谱法 /
- 传梓源地区稀有金属矿床 /
- 地球化学特征 /
- 锂辉石伟晶岩 /
- 钠长石伟晶岩 /
- 钾长石伟晶岩
Abstract:
X-ray Fluorescence Spectrometry (XRF) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) were used to obtain the geochemical data of podumene pegmatite, albite pegmatite and potash feldspar pegmatite in the Chuan-ziyuan area. Podumene pegmatite contains high Al₂O₃ (16.23%-16.4%) and K₂O (3.05%-5.22%) with high differentiation index (91.13-94.9). Podumene pegmatite is enriched in Rb and K but depleted in Ba, Sr and Ti with ΣREEs of 2.9×10^-6-3.5×10^-6. Albite pegmatite is characterized by high Na₂O (5.58%-7.41%) and low K₂O (0.98%-2.62%). Compared to podumene pegmatite, the Rb/Sr ratios of albite pegmatite decreased and REEs increased. Potash feldspar pegmatite contains high K₂O (9.13%) and low Na₂O (1.69%), the Zr/Hf and K/Rb ratios increased compared to podumene pegmatite and albite pegmatite. The geochemical characteristics of these rocks indicate that liquid immiscibility, albitization metasomatism and potash feldspathization metasomatism resulted in Li and Rb mineralization in podumene pegmatite, Nb, Ta and Be mineralization in albite pegmatite and potash feldspar pegmatite, respectively. These observations are geochemical indicators for exploration of the rare metal deposits.
- X-ray Fluorescence Spectrometry /
- Inductively Coupled Plasma-Mass Spectrometry /
- rare metal deposit of Chuan-ziyuan area /
- geochemical characteristics /
- spodumene pegmatite /
- albite pegmatite /
- potash feldspar pegmatite

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图 1 传梓源地区代表性样品主量元素(a)、稀有元素含量变化(b)及微量元素蛛网图(c)和稀土配分图(d), 其中c、d标准值据Sun and McDonough，1989^[17]

Figure 1.

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表 1 传梓源地区伟晶岩的主量元素含量分析结果

Table 1. Analytical data of major elements of pegmatite samples from Chuan-ziyuan deposit by XRF

主量元素	锂辉石伟晶岩含量(%)		钠长石伟晶岩含量(%)				钾长石伟晶岩含量(%)
主量元素	PJ-CZY-6-3	PJ-CZY-6-6	PJ-CZY-5-5	PJ-6-2-1	PJ-9-4-2	PJ-9-4-4	PJ-9-5-2
SiO₂	73.3	71.87	73.1	75	77.3	73.4	73.2
Al₂O₃	16.4	16.23	16.5	15.5	13.4	14.7	14.4
Fe₂O₃	0.21	0.12	0.1	0.07	0.34	0.45	0.14
FeO	0.45	0.34	0.31	0.34	0.47	0.45	0.38
CaO	0.19	0.18	0.18	0.16	0.39	0.89	0.24
MgO	0.08	0.06	0.08	0.07	0.09	0.23	0.09
K₂O	3.05	5.22	2.59	0.99	0.98	2.62	9.13
Na₂O	4.38	4.93	5.58	7.41	6.29	5.67	1.69
TiO₂	0.01	0.01	0.01	0.01	0.01	0.02	0.01
MnO	0.24	0.24	0.1	0.12	0.17	0.16	0.05
P₂O₅	0.08	0.09	0.07	0.04	0.14	0.1	0.15
H₂O⁺	0.34	0.26	0.25	0.24	0.26	0.4	0.14
CO₂	0.26	0.26	0.39	0.09	0.26	0.43	0.34
Total	98.99	99.81	99.2	100	100	99.5	100
Na₂O+K₂O	7.43	10.15	8.17	8.4	7.27	8.29	10.8
分异指数(DI)	91.13	94.9	92.6	96.4	95.3	93.6	95.3

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表 2 传梓源地区伟晶岩的微量元素和稀有元素含量分析结果

Table 2. Analytical data of trace elements and rare metal elements of pegmatite samples from Chuan-ziyuan deposit by ICP-MS

微量元素和稀有元素	锂辉石伟晶岩 (含量×10^-6)		钠长石伟晶岩 (含量×10^-6)				钾长石伟晶岩 (含量×10^-6)
微量元素和稀有元素	PJ-CZY-6-3	PJ-CZY-6-6	PJ-CZY-5-5	PJ-6-2-1	PJ-9-4-2	PJ-9-4-4	PJ-9-5-2
ΣREEs	3.5	2.9	14.36	2.88	10.96	78.52	4.27
LREEs	2.85	2.33	13.73	1.8	8.43	73.93	3.15
HREEs	0.65	0.57	0.63	1.08	2.53	4.59	1.12
LREEs/HREEs	4.4	4.1	21.8	1.7	3.3	16.1	2.8
(La/Yb)_N	7.7	8.3	24.4	2.2	3.5	27.6	3.9
δEu	1.1	1.0	0.8	0.8	0.6	0.9	0.8
K/Rb	31.6	34.4	23.9	40.5	60.7	70.8	259.6
Rb/Sr	65.6	86.8	70.2	17.2	9.6	7.8	14.1
Zr/Hf	15.4	10.2	7.9	10.6	16.7	14.4	22.6
Li	1211	189	1036	106	61.5	66.4	26
Be	134	98.9	131	109	435	20.9	4.35
Rb	800	1259	899	203	134	307	292
Nb	15.5	26.8	101	58.7	11.9	17.3	2.32
Ta	3.28	11.4	66.8	22.2	4.19	5.08	0.66

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应用X射线荧光光谱-电感耦合等离子体质谱法研究湖南传梓源地区稀有金属矿床伟晶岩地球化学特征

1. 湖南省地质调查院, 湖南 长沙 410116 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

作者简介: 文春华, 博士, 工程师, 主要从事矿床地球化学及矿床成矿流体研究. E-mail: herowch2004@163.com.

Application of X-ray Fluorescence Spectrometry and Inductively Coupled Plasma-Mass Spectrometry in the Geochemical Study of Rare Metal Deposits in Chuan-ziyuan Area, Hunan Province

1. Hunan Institute of Geological Survey, Changsha 410116, 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

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1.
湖南省地质调查院, 湖南长沙 410116

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

1.
Hunan Institute of Geological Survey, Changsha 410116, 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