电子探针测年方法应用于粤北长江岩体的铀矿物年龄研究

张龙; 陈振宇; 田泽瑾; 黄国龙

doi:10.15898/j.cnki.11-2131/td.2016.01.016

电子探针测年方法应用于粤北长江岩体的铀矿物年龄研究

1.
中国地质大学(北京)地球科学与资源学院, 北京 100083

2.
中国地质科学院矿产资源研究所, 国土资源部成矿作用与资源评价重点实验室, 北京 100037

3.
核工业290研究所, 广东韶关 512026

基金项目: 中国地质大调查项目"广东诸广山南部地区铀多金属矿成矿地质条件与综合找矿方法研究"(12120113090500)

详细信息

作者简介: 张龙, 硕士研究生, 成因矿物学与找矿矿物学研究方向。E-mail:1621997995@qq.com

通讯作者: 陈振宇, 博士, 教授级高级工程师, 主要从事矿物学和微束分析研究。E-mail:czy7803@126.com

中图分类号: P597.3;P619.14

收稿日期: 2015-09-11

修回日期: 2016-01-12

录用日期: 2016-01-18

刊出日期: 2016-01-25

The Application of Electron Microprobe Dating Method on Uranium Minerals in Changjiang Granite, Northern Guangdong

1.
School of Earth Science and Resources, China University of Geosciences(Beijing), Beijing 100083, China

2.
Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

3.
Research Institute No.290, China National Nuclear Corporation, Shaoguan 512026, China

More Information

Corresponding author: CHEN Zhen-yu, czy7803@126.com

Received Date: 11 September 2015

Revised Date: 12 January 2016

Accepted Date: 18 January 2016

Publish Date: 25 January 2016

摘要

摘要:
晶质铀矿被认为是花岗岩型铀矿成矿的主要矿源提供者, 在评价岩体的含矿性和确定成岩成矿年龄方面有重要意义。长江岩体属于诸广山复式岩体的一部分, 是粤北地区重要的产铀花岗岩体, 本文利用电子探针对该岩体中的铀矿物进行研究。结果表明:长江岩体中的铀矿物多以充填或被黄铁矿包围的形式存在, 或者分布于石英、黑云母、绿泥石等矿物中; 铀矿物类型主要有晶质铀矿、沥青铀矿、铀石、铀钍石四种。晶质铀矿/沥青油矿的化学年龄值可分为三组:~155 Ma、~106 Ma和~74 Ma。第一组年龄代表岩体的形成时代, 后两组年龄代表铀矿的多期次成矿作用年龄。铀矿物从成岩后到~106 Ma, 成分没有发生明显变化, 直到~74 Ma后才发生明显的U元素活化、迁移。因此, 可以推测长江岩体地区主要的铀矿成矿期应发生在~74 Ma及之后。
- 电子探针定年 /
- 晶质铀矿 /
- 铀矿成矿 /
- 长江岩体 /
- 粤北
Abstract:
Uraninite is considered to be the main ore source provider of granite-hosted uranium deposits, it plays a significant role in mineralization assessment of granite and constraining the age of digenesis and uranium mineralization.Changjiang granite is a part of the Zhuguang Mountains, and is important U-bearing granite in the north of Guangdong.Uranium minerals in this granite are studied by Electron Microprobe.Results show that uranium minerals mainly fill in the spaces between minerals or are surrounded by pyrite.Uranium minerals are also found in quartz, biotite, chlorite and other minerals.The main types of uranium minerals are uraninite, pitchblende, uranothorite and uranophane.The chemical ages of uraninite and pitchblende dated by Electron Microprobe can be divided into three groups, 155 Ma, 106 Ma and 74 Ma.The first group represents the formation age of Changjiang granite mass, and the second and third groups represent multiple stages of uranium mineralization.From rock formation to about 106 Ma, the composition of uraninite has not changed significantly.Obvious U activation and migration did not happen until 74 Ma, so the main uranium mineralization of Changjiang granite may have occurred at about 74 Ma or later.
- Electron Microprobe dating /
- uraninite /
- uranium mineralization /
- Changjiang granite /
- northern Guangdong

HTML全文

图 1 长江岩体分布及采样位置略图(据黄国龙等^[13]，2014)

Figure 1.

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图 2 长江岩体中铀矿物赋存类型背散射图像

Figure 2.

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图 3 铀矿物的元素含量与年龄及元素之间的相关关系

Figure 3.

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图 4 铀矿物化学年龄频率图

Figure 4.

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表 1 铀矿物的电子探针分析结果及化学年龄

Table 1. EPMA analytical results of the main elements and their ages

样品编号	含量(%)										含量(%)			年龄(Ma)
样品编号	UO ₂	ThO ₂	PbO	SiO ₂	CaO	FeO	Y ₂O ₃	Ce ₂O ₃	Nd ₂O ₃	总量	U	Th	Pb	年龄(Ma)
CJ304-1-1	84.041	8.659	1.631	0	0	0.43	1.656	0.358	0.316	97.091	74.082	7.610	1.514	148.7
CJ304-1-2	83.705	6.177	1.097	0.008	0	0.457	1.624	0.283	0.236	93.587	73.786	5.428	1.018	101.5
CJ304-2-1	88.096	5.253	1.193	0.018	0	0.042	1.187	0.138	0	95.927	77.657	4.616	1.107	105.4
CJ304-2-2	86.737	5.486	1.252	0.01	0	0.021	1.045	0.214	0.031	94.796	76.459	4.821	1.162	112.2
CJ304-2-3	88.812	6.934	1.802	0	0	0.012	0.941	0.113	0.033	98.647	78.288	6.094	1.673	156.9
CJ304-2-4	88.967	5.719	1.408	0.273	0	0	0.946	0.095	0.042	97.45	78.424	5.026	1.307	123.0
CJ304-2-5	89.483	5.054	1.34	0	0	0.057	0.883	0.16	0.049	97.026	78.879	4.441	1.244	116.7
CJ304-2-6	90.133	6.416	1.819	0	0	0	0.821	0.171	0.016	99.376	79.452	5.638	1.689	156.4
CJ304-2-7	90.276	4.176	1.277	0.014	0	0.016	0.827	0.185	0.004	96.775	79.578	3.670	1.185	110.6
CJ304-2-8	86.99	5.449	1.182	0	0	0.055	1.041	0.146	0.041	94.904	76.682	4.789	1.097	105.6
CJ304-2-9	90.546	4.781	1.531	0	0	0	0.697	0.139	0	97.694	79.816	4.202	1.421	131.9
CJ304-2-10	91.823	3.365	1.257	0	0	0.034	0.624	0.16	0.015	97.278	80.942	2.957	1.167	107.4
CJ304-2-11	91.93	5.191	1.877	0.001	0	0.094	0.649	0.14	0	99.882	81.036	4.562	1.742	159.1
CJ304-2-12	91.689	3.756	1.807	0	0	0.034	0.75	0.198	0	98.234	80.824	3.301	1.677	154.4
CJ304-2-13	88.572	4.737	1.326	0	0	0.009	0.859	0.133	0.016	95.652	78.076	4.163	1.231	116.8
CJ304-2-14	89.52	6.788	1.775	0	0	0	0.937	0.094	0	99.114	78.912	5.965	1.648	153.4
CJ304-2-15	90.563	3.784	1.228	0	0	0.059	0.796	0.215	0	96.645	79.831	3.325	1.140	106.2
CJ304-2-16	91.889	3.268	1.151	0	0	0.041	0.709	0.144	0	97.202	81.000	2.872	1.068	98.3
CJ304-2-17	86.916	5.686	1.235	0	0	0	1.06	0.131	0.071	95.099	76.616	4.997	1.146	110.3
CJ304-2-18	86.49	8.482	1.789	0	0	0.003	1.077	0.204	0.045	98.09	76.241	7.454	1.661	158.8
CJ304-2-19	89.073	4.217	1.149	0.125	0	0.037	0.88	0.081	0.102	95.664	78.518	3.706	1.067	100.8
CJ304-2-20	89.749	3.544	1.178	0.106	0	0.044	1.027	0.208	0	95.856	79.114	3.114	1.094	102.9
CJ304-3-1	88.733	5.847	1.766	0	0	0.411	1.647	0.215	0.161	98.78	78.218	5.138	1.639	154.5
CJ304-3-2	89.576	5.529	1.672	0.086	0	0.635	1.464	0.187	0.016	99.165	78.961	4.859	1.552	145.1
CJ304-3-3	88.355	4.316	1.264	0.011	0	0.594	2.305	0.24	0.222	97.307	77.885	3.793	1.173	111.8
CJ304-3-4	84.002	8.173	1.704	0	0	0.078	2.436	0.305	0.161	96.859	74.048	7.182	1.582	155.8
CJ304-3-5	83.635	5.34	1.263	0.143	0	0.121	2.658	0.19	0.167	93.517	73.724	4.693	1.172	117.3
CJ304-3-6	83.401	7.142	1.386	0	0	0.223	2.346	0.237	0.178	94.913	73.518	6.276	1.287	128.1
CJ304-3-7	83.915	8.565	1.734	0.022	0	0.121	2.361	0.345	0.171	97.234	73.971	7.527	1.610	158.4
CJ304-3-8	83.44	4.537	1.179	0.032	0	0.365	2.026	0.186	0.213	91.978	73.552	3.987	1.094	110.2
CJ304-3-9	82.994	6.705	1.357	0	0	0.095	2.175	0.305	0.179	93.81	73.159	5.892	1.260	126.3
CJ304-3-10	83.315	8.644	1.699	0.07	0	0.013	2.391	0.264	0.187	96.583	73.442	7.596	1.577	156.2
CJ304-3-11	83.519	6.105	1.229	0	0	0.064	2.384	0.218	0.187	93.706	73.622	5.365	1.141	114.0
CJ304-3-12	85.782	4.824	1.207	0	0	0.186	2.686	0.268	0.267	95.22	75.617	4.239	1.120	109.6
CJ304-3-13	90.679	5.632	1.828	0.023	0	0.857	1.842	0.245	0.082	101.188	79.934	4.949	1.697	156.7
CJ211-1-1	82.649	5.178	1.23	0	0	0.185	3.583	0.289	0.293	93.407	72.855	4.550	1.142	115.7
CJ211-1-2	85.194	6.32	1.716	0.223	0	0.027	2.158	0.245	0.192	96.075	75.099	5.554	1.593	155.9
CJ211-1-3	84.384	4.743	1.234	0.28	0	0.186	2.699	0.315	0.305	94.146	74.384	4.168	1.146	113.9
CJ211-1-4	86.194	6.241	1.63	0	0	0.498	2.425	0.212	0.103	97.303	75.980	5.485	1.513	146.5
CJ211-1-5	87.942	4.409	1.169	0.142	0	0.955	2.059	0.206	0.346	97.228	77.521	3.875	1.085	103.8
CJ211-1-6	88.39	4.157	1.058	0	0	0.623	1.88	0.186	0.196	96.49	77.916	3.653	0.982	93.6
CJ211-1-7	83.574	4.586	1.155	0	0	0.145	2.895	0.27	0.295	92.92	73.670	4.030	1.072	107.7
CJ211-1-8	86.02	3.391	1.133	0	0	0.009	2.418	0.23	0.221	93.422	75.827	2.980	1.052	103.2
CJ211-1-9	85.326	3.472	1.149	0	0	0.039	2.866	0.372	0.339	93.563	75.215	3.051	1.067	105.5
CJ211-1-10	85.992	4.109	1.144	0.017	0	0	2.03	0.219	0.265	93.776	75.802	3.611	1.062	104.0
CJ211-1-11	88.482	6.872	1.709	0	0	0.39	1.865	0.283	0.249	99.85	77.997	6.039	1.586	149.3
CJ211-1-12	87.528	4.219	1.108	0	0	0.233	1.976	0.262	0.153	95.479	77.156	3.708	1.029	98.9
CJ211-1-13	87.604	4.619	1.176	0	0	0.082	1.848	0.253	0.206	95.788	77.223	4.059	1.092	104.7
CJ211-1-14	84.254	4.158	1.099	0	0	0.054	2.761	0.426	0.484	93.236	74.269	3.654	1.020	101.9
CJ211-1-15	81.635	4.229	1.099	0.314	0	0.082	3.311	0.261	0.282	91.213	71.961	3.716	1.020	105.1
CJ211-2-1	91.438	6.528	1.849	0	0	0.063	0.573	0.077	0	100.528	80.603	5.737	1.716	156.7
CJ211-2-2	89.747	7.336	1.867	0	0	0.124	0.551	0.138	0	99.763	79.112	6.447	1.733	160.6
CJ211-2-3	88.306	7.615	1.804	0	0	0.091	1.088	0.164	0.062	99.13	77.842	6.692	1.675	157.5
CJ211-2-4	88.187	7.346	1.814	0	0	0.514	0.758	0.144	0.022	98.785	77.737	6.456	1.684	158.7
CJ211-2-5	88.688	6.768	1.899	0	0	0.074	1.033	0.153	0.086	98.701	78.178	5.948	1.763	165.6
CJ211-3-1	91.497	4.863	1.797	0.013	0	0.777	0.83	0.22	0	99.997	80.655	4.274	1.668	153.2
平均值	87.328	5.526	1.436	0.034	0.000	0.185	1.632	0.211	0.130	96.483	76.980	4.856	1.333	-
CJ304-4-1	77.497	0	0.803	2.121	9.483	0.292	1.033	0.717	1.253	93.199	68.314	0.000	0.745	82.4
CJ304-4-2	76.751	0	0.712	2.908	7.132	0.281	1.347	0.91	1.448	91.489	67.656	0.000	0.661	73.8
CJ304-4-3	77.795	0	0.656	2.244	8.465	0.296	1.463	0.911	1.34	93.17	68.576	0.000	0.609	67.0
CJ304-4-4	78.114	0	0.895	2.367	8.259	0.178	1.27	0.542	1.123	92.748	68.857	0.000	0.831	91.1
CJ304-4-5	75.843	0	0.706	2.401	8.226	0.247	1.313	1.51	2.467	92.713	66.856	0.000	0.655	74.0
CJ304-4-6	74.79	0	0.736	3.903	6.948	0.332	1.718	0.885	1.511	90.823	65.927	0.000	0.683	78.2
CJ304-4-7	76.277	0	0.706	2.209	8.333	0.278	1.344	0.85	1.407	91.404	67.238	0.000	0.655	73.6
CJ304-4-8	77.393	0	0.719	3.339	5.798	0.359	1.398	0.924	1.258	91.188	68.222	0.000	0.667	73.9
CJ304-4-9	76.874	0	0.897	2.038	9.207	0.249	1.132	0.856	2.067	93.32	67.764	0.000	0.833	92.8
平均值	76.815	0.000	0.759	2.614	7.983	0.279	1.335	0.901	1.542	92.228	67.712	0.000	0.704	-
CJ211-4-1	17.208	54.92	0.382	13.394	1.232	0.068	3.57	0.198	0.207	91.179
CJ211-4-2	17.589	54.29	0.248	18.613	2.889	0.799	1.197	0.239	0.124	95.988
平均值	17.399	54.605	0.315	16.004	2.061	0.434	2.384	0.219	0.166	93.584
KC301-1-1	66.816	0	0	17.256	1.661	0.044	2.611	0.452	0.452	89.292
KC301-1-2	60.722	0	0.028	18.633	1.462	0	5.664	0.446	0.446	87.401
KC301-1-3	69.959	0	0.065	17.137	1.771	0.015	1.691	0.384	0.384	91.406
KC301-1-4	60.331	0	0.016	19.425	1.819	0.348	3.639	0.632	0.632	86.842
KC301-2-1	59.725	0	0.01	19.555	1.661	0.122	3.757	0.718	0.718	86.266
KC301-2-2	69.825	0	0	11.327	4.367	1.213	0.02	0.781	0.781	88.314
KC301-2-3	71.152	0	0	11.026	4.37	1.123	0.114	0.816	0.816	89.417
KC301-2-4	68.757	0	0	12.201	4.445	1.304	0.073	0.787	0.787	88.354
KC301-2-5	61.244	0	0	18.162	1.473	0.028	4.532	0.473	0.473	86.385
KC301-2-6	69.607	0	0.005	13.011	2.289	0.22	2.284	0.608	0.608	88.632
平均值	65.814	0.000	0.012	15.773	2.532	0.442	2.439	0.610	0.610	88.231

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表 2 各期次铀矿物主要元素含量对比

Table 2. Comparison of the major elements' content in different stages

时代	对比项目	主要元素含量(%)
时代	对比项目	UO ₂	ThO ₂	PbO	SiO ₂+CaO+FeO	REEs
~155 Ma	平均值	88.111	6.8094	1.777	0.250	1.654
~155 Ma	变化范围	83.315~91.930	3.756~8.659	1.631~1.877	0~0.880	0.650~2.902
~106 Ma	平均值	86.612	4.751	1.2019	0.239	0.673
~106 Ma	变化范围	81.635~91.823	3.365~8.659	1.097~1.631	0.009~1.097	0.198~1.649
~74 Ma	平均值	76.429	0	0.703	10.8547	3.580
~74 Ma	变化范围	74.790~77.795	0	0.656~0.736	9.496~11.183	5.290~4.109
矿石矿物	平均值	65.814	0	0.016	18.715	3.726
矿石矿物	变化范围	59.725~71.152	0	0~0.065	115.520~21.529	1.582~6.556

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电子探针测年方法应用于粤北长江岩体的铀矿物年龄研究

1. 中国地质大学(北京)地球科学与资源学院, 北京 100083 2. 中国地质科学院矿产资源研究所, 国土资源部成矿作用与资源评价重点实验室, 北京 100037 3. 核工业290研究所, 广东 韶关 512026

作者简介: 张龙, 硕士研究生, 成因矿物学与找矿矿物学研究方向。E-mail:1621997995@qq.com

通讯作者: 陈振宇, 博士, 教授级高级工程师, 主要从事矿物学和微束分析研究。E-mail:czy7803@126.com

The Application of Electron Microprobe Dating Method on Uranium Minerals in Changjiang Granite, Northern Guangdong

Corresponding author: CHEN Zhen-yu, czy7803@126.com

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1.
中国地质大学(北京)地球科学与资源学院, 北京 100083

2.
中国地质科学院矿产资源研究所, 国土资源部成矿作用与资源评价重点实验室, 北京 100037

3.
核工业290研究所, 广东韶关 512026