幕阜山地区断峰山铌钽矿的矿物学、年代学和赋存状态

祝明明; 邹建林; 王闯; 冯超; 付宏林; 赵鹏; 陈阳; 徐海军

doi:10.19509/j.cnki.dzkq.2021.0606

幕阜山地区断峰山铌钽矿的矿物学、年代学和赋存状态

doi: 10.19509/j.cnki.dzkq.2021.0606

祝明明^1,,
邹建林¹,
王闯¹,
冯超¹,
付宏林²,
赵鹏¹,
陈阳²,
徐海军^2, ,

基金项目:

湖北省自然资源厅科研计划项目 ZRZY2019KY05

国家自然科学基金项目 41772222

详细信息

作者简介:
祝明明(1989-), 男, 工程师, 主要从事地质矿产勘查方面的研究工作。E-mail: zhummingwh@163.com

通讯作者:
徐海军(1978-), 男, 副教授, 主要从事显微构造和大陆深部构造方面的研究工作。E-mail: hj_xu@sina.com

中图分类号: P57
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出版历程
- 收稿日期: 2021-01-12

Mineralogy, geochronology and occurrence state of the Duanfengshan Nb-Ta deposit in Mufushan area

摘要

摘要: 幕阜山复式花岗岩体位于湖北、湖南和江西三省交界处，在岩体北缘的断峰山和南缘的仁里地区相继发现两个大型铌钽矿床。围绕断峰山铌钽矿床，在野外调查基础上开展矿物学和年代学测试分析，旨在揭示铌钽矿赋存状态、成矿时代和成矿特征，为理解幕阜山地区铌钽矿的矿床成因和指导找矿工作提供基础地质约束资料。断峰山铌钽矿床位于幕阜山复式花岗岩体北缘与冷家溪群接触带的伟晶岩密集区，属于典型花岗伟晶岩型铌钽矿床。铌钽矿主要产出于白云母钠长石伟晶岩中，多以半自形-自形铌锰矿矿物赋存，常见伴生矿物有钠长石、白云母和石英。铌钽矿LA-ICP-MS U-Pb测年数据为136.6~136.2 Ma，反映铌钽矿结晶和成矿年龄。断峰山铌钽矿的形成与幕阜山复式花岗岩体多期次多阶段演化分异作用密切相关，成矿元素可能受到岩浆演化后期熔流体活动和围岩黑云母片岩共同控制。
- LA-ICP-MS /
- U-Pb测年 /
- 断峰山铌钽矿 /
- 幕阜山
Abstract: The two large niobium-tantalum deposits, Duanfengshan in the north margin and Renli in the south margin, were reported in the Mufushan area located in the junction of Hubei, Hunan and Jiangxi provinces.In this paper, we present field geological survey, mineralogical and geochronological investigations on the Duanfengshan Nb-Ta deposit, which are important to reveal the metallogenic characteristic, ore genesis and prospecting direction of the Nb-Ta deposit in the Mufushan area.The Duanfengshan Nb-Ta deposit is a typical granitic pegmatite type Nb-Ta deposit.It is mainly located in the densely distributed pegmatite area within the contact zone between the northern Mufushan composite granite and Lengjiaxi Group.The Nb and Ta elements are commonly enriched in the muscovite-ablite pegmatite, and are mainly hosted in the independent manganocolumbite minerals which commonly associated with albite, muscovite and quartz.Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb dating of columbotantalite from the Nb-Ta pegmatite yielded concordant ages of 136.6-136.2 Ma, which denotes the Nb-Ta mineralization age.The data indicate that the ore forming elements of Nb and Ta are probably enriched from the evolution and differentiation of Mufushan granite magma, while the crystal nucleation and growth of Nb and Ta bearing minerals are influenced and controlled by many factors especially the fluid melt of late stage magma as well as the host country rock of biotite gneiss.
- LA-ICP-MS /
- U-Pb dating /
- Duanfengshan Nb-Ta deposit /
- Mufushan

HTML全文

图 1 幕阜山区域地质简图

(据文献[11])

Figure 1. Regional geological map of the Mufushan area

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图 2 断峰山矿区伟晶岩脉分布图

(据文献[14]修改)

Figure 2. Distribution of the pegmatite dykes in the Duanfengshan mining area

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图 3 断峰山矿区构造和岩性特征

a.伟晶岩脉侵入黑云母片岩；b.围岩和脉体的面理产状赤平投影图；c.伟晶岩脉内部分带；d.伟晶岩脉与围岩黑云母片岩；e.伟晶岩与黑云母片岩接触边界发育白云母片岩和电气石

Figure 3. Geological structures and lithologies characteristic in Duanfengshan mining area

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图 4 铌钽矿野外产状和矿物特征

a.白云母钠长伟晶岩脉体中偶见有自形的铌钽矿单晶；b.伟晶岩脉中的铌钽矿发生氧化，形成晕状氧化边；c.铌钽矿与斜长石、云母和石英的共生关系；d.铌钽矿多晶集合体与石英共生；e.铌钽矿单晶和多晶集合体。CCG.铌钽矿；Kfs.钾长石；Pl.斜长石；Qz.石英；Ms.白云母

Figure 4. Field occurrence and mineral characteristic of columbotantalite ore

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图 5 断峰山含铌钽矿伟晶岩脉的显微图片

a.白云母钠长伟晶岩脉体与围岩黑云母片岩接触边界，正交偏光；b.伟晶岩与细晶岩局部呈带状展布，正交偏光；c.白云母钠长伟晶岩脉中可见铌钽矿颗粒，正交偏光；d.铌钽矿氧化蚀变，核部残留有新鲜铌钽矿，反射光；e.铌钽矿与云母、石英和斜长石共生，正交偏光；f.铌钽矿与云母、石英和长石共生，反射光。CCG.铌钽矿；Kfs.钾长石；Pl.斜长石；Qz.石英；Ms.白云母；Bi.黑云母。20D3-1为样品号

Figure 5. Micrographs of columbotantalite bearing pegmatite in Duanfengshan mine

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图 6 铌钽矿矿物的背散射电子图像

a~b.厘米级铌钽矿单晶内部发育明显成分环带；c~d.铌钽矿内部成分环带不明显；e.铌钽矿内部不显示环带结构；f.铌钽矿内部包裹自形石英

Figure 6. Backscattered electron images of columbotantalite minerals

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图 7 铌钽矿矿物的电子背散射图像和元素能谱扫描图

Figure 7. Electron backscattered images and element energy spectrum distributions of columbotantalite minerals

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图 8 铌钽矿电子探针数据的元素比分类图解

断峰山铌钽矿数据为本文测量结果，仁里铌钽矿数据引自文献[10]

Figure 8. Quadrilateral diagrams (Ta/(Ta+Nb) atomic ratio versue Mn/(Mn+Fe) atomic ratio) for the analyzed columbotantalite grains

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图 9 断峰山铌钽矿LA-ICP-MS年代学数据U-Pb谐和图

Figure 9. U-Pb concordia diagrams for columbotantalite samples from the Duanfengshan mine (acquired using LA-ICP-MS)

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图 10 幕阜山地区花岗岩体、脉体和铌钽矿的年代学数据

断峰山铌钽矿数据为本文测量结果，其他数据引自文献[7-11, 20]

Figure 10. Geochronology data of granite, vein and columbotantalite from the Mufushan area

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表 1 幕阜山地区断峰山铌钽矿的电子探针分析结果

Table 1. EPMA data of columbotantalite from the Duanfengshan mine in Mufushan area

元素	DFS-5											DFS-6						DFS-8
元素	1	2	3	4	5	6	7	8	9	10	11	1	2	3	4	5	6	1	2	3	4	5	8
SiO₂	0.62	0.56	0.23	0.75	0.73	0.64	0.22	0.83	0.34	0.28	0.19	0.06	0.05	0.05	0.08	0.05	0.03	1.08	0.71	0.16	0.19	1.26	0.26
TiO₂	0.87	0.80	0.98	0.69	1.24	0.74	0.67	0.80	0.93	0.87	0.64	0.55	0.47	0.64	0.62	0.60	0.54	0.69	0.48	0.56	0.46	0.76	0.61
FeO^*	3.28	3.39	3.20	3.11	3.19	2.76	3.27	2.76	3.02	2.81	3.69	6.94	6.94	6.76	7.00	6.87	6.96	2.65	2.92	3.06	2.82	2.37	2.50
MnO	12.21	12.53	11.95	11.84	11.96	12.54	12.78	12.27	12.38	12.15	12.95	10.95	11.14	10.03	10.81	10.88	10.94	11.62	12.01	12.04	12.08	11.22	12.23
CaO	0.04	0.04	0.06	0.07	0.04	0.04	0.05	0.05	0.03	0.11	0.04	0.04	0.03	0.01	0.02	0.03	0.03	0.21	0.06	0.04	0.04	0.03	0.03
U₂O w_B/%	0.19	0.23	0.60	0.10	0.70	0.39	0.23	0.24	0.19	0.25	0.13	0.26	0.21	0.20	0.18	0.33	0.33	1.79	0.28		0.19	0.54	0.23
ThO₂	0.09		0.04				0.03				0.06	0.04
PbO	0.02	0.19		0.05	0.09	0.41	0.17	0.08	0.20	0.19	0.30	0.28	0.13	0.19	0.58	0.32	0.26	0.22	0.22	0.13	0.15	0.12	0.36
Nb₂O₅	45.26	49.80	41.05	40.61	39.54	46.27	45.69	38.36	38.16	34.06	49.31	66.78	66.81	66.68	66.39	66.21	66.57	40.61	43.00	52.23	44.84	27.38	39.93
Ta₂O₅	34.50	32.39	38.82	39.38	40.85	35.15	35.14	42.27	43.49	45.39	30.84	11.68	12.34	12.27	12.64	11.92	11.45	38.92	37.75	29.72	36.36	54.93	41.03
Y₂O₃		0.04	0.06	0.10	0.01	0.04	0.06	0.09	0.06		0.12	0.54	0.48	0.52	0.54	0.22	0.16		0.02	0.25	0.14		0.01
Sc₂O₃	0.15	0.16	0.14	0.16	0.16	0.14	0.17	0.13	0.18	0.17	0.16	0.06	0.06	0.06	0.09	0.08	0.09	0.14	0.15	0.12	0.10	0.20	0.17
SnO₂	0.03	0.02	0.01		0.07	0.01	0.06		0.05		0.00						0.02	0.00	0.03			0.09	0.04
ZrO₂	0.20	0.25	0.22	0.04	0.29	0.17	0.06	0.15	0.09	0.17	0.05	0.07	0.09	0.18	0.07	0.13	0.09	0.10	0.04	0.09	0.03	0.18	0.08
WO₃	0.53	0.42	0.32	0.41	0.52	0.38	0.26	0.49	0.42	0.49	0.37	0.34	0.27	0.25	0.33	0.23	0.31	0.26	0.30	0.29	0.31	0.56	0.51
总计	97.98	100.82	97.69	97.32	99.40	99.68	98.86	98.52	99.52	96.93	98.83	98.56	99.02	97.83	99.35	97.88	97.78	98.28	97.95	98.68	97.69	99.65	97.97
Ta₂O₅/Nb₂O₅	0.76	0.65	0.95	0.97	1.03	0.76	0.77	1.10	1.14	1.33	0.63	0.17	0.18	0.18	0.19	0.18	0.17	0.96	0.88	0.57	0.81	2.01	1.03
Si	0.041	0.036	0.015	0.051	0.049	0.041	0.015	0.056	0.023	0.020	0.012	0.003	0.003	0.003	0.005	0.003	0.002	0.073	0.047	0.010	0.013	0.090	0.018
Ti	0.043	0.038	0.050	0.035	0.062	0.036	0.033	0.041	0.047	0.046	0.031	0.025	0.021	0.029	0.028	0.027	0.025	0.035	0.024	0.027	0.023	0.041	0.031
Fe²⁺	0.181	0.179	0.181	0.176	0.178	0.150	0.180	0.157	0.171	0.166	0.199	0.347	0.346	0.340	0.349	0.346	0.350	0.150	0.163	0.163	0.158	0.141	0.143
Mn	0.681	0.670	0.687	0.679	0.678	0.690	0.712	0.704	0.710	0.728	0.709	0.554	0.562	0.511	0.545	0.555	0.557	0.666	0.681	0.651	0.684	0.674	0.708
Nb	1.347	1.422	1.260	1.243	1.196	1.358	1.358	1.175	1.168	1.089	1.440	1.804	1.798	1.811	1.786	1.802	1.811	1.243	1.301	1.509	1.356	0.879	1.234
Ta	0.617	0.556	0.717	0.725	0.743	0.621	0.628	0.779	0.801	0.873	0.542	0.190	0.200	0.201	0.205	0.195	0.187	0.717	0.687	0.516	0.662	1.060	0.763
Ca	0.003	0.003	0.004	0.005	0.003	0.003	0.004	0.004	0.002	0.008	0.002	0.002	0.002		0.001	0.002	0.002	0.015	0.004	0.003	0.003	0.002	0.002
U	0.003	0.004	0.010	0.002	0.011	0.006	0.004	0.004	0.003	0.004	0.002	0.004	0.003	0.003	0.003	0.005	0.005	0.030	0.005		0.003	0.009	0.004
Th	0.001		0.001								0.001
Pb		0.003		0.001	0.002	0.007	0.003	0.001	0.004	0.004	0.005	0.004	0.002	0.003	0.009	0.005	0.004	0.004	0.004	0.002	0.003	0.002	0.007
Y		0.001	0.002	0.004		0.001	0.002	0.003	0.002		0.004	0.017	0.015	0.017	0.017	0.007	0.005		0.001	0.008	0.005
Sc	0.008	0.009	0.008	0.010	0.009	0.008	0.010	0.007	0.011	0.010	0.009	0.003	0.003	0.003	0.005	0.004	0.005	0.008	0.009	0.007	0.006	0.013	0.010
Sn	0.001	0.001			0.002		0.002		0.001										0.001			0.003	0.001
Zr	0.006	0.008	0.007	0.001	0.009	0.005	0.002	0.005	0.003	0.006	0.002	0.002	0.003	0.005	0.002	0.004	0.003	0.003	0.001	0.003	0.001	0.006	0.003
W	0.009	0.007	0.006	0.007	0.009	0.006	0.004	0.009	0.007	0.009	0.006	0.005	0.004	0.004	0.005	0.004	0.005	0.004	0.005	0.005	0.005	0.010	0.009
总计	2.941	2.935	2.950	2.939	2.952	2.934	2.956	2.946	2.953	2.964	2.964	2.961	2.961	2.929	2.959	2.960	2.961	2.950	2.932	2.905	2.921	2.930	2.932
Mn/(Mn+Fe)	0.79	0.79	0.79	0.79	0.79	0.82	0.80	0.82	0.81	0.81	0.78	0.61	0.62	0.60	0.61	0.62	0.61	0.82	0.81	0.80	0.81	0.83	0.83
Ta/(Ta+Nb)	0.31	0.28	0.36	0.37	0.38	0.31	0.32	0.40	0.41	0.44	0.27	0.10	0.10	0.10	0.10	0.10	0.09	0.37	0.35	0.25	0.33	0.55	0.38
元素	DFS-8				DFS-9									DFS-10
元素	9	10	11	12	1	2	4	5	6	7	8	9	10	1	2	3	4	5	6	7	8	9	10
SiO₂	0.27	0.88	0.32	0.89	0.28	0.27	0.25	0.25	0.27	0.30	0.77	0.28	0.29	0.14	0.47	0.07	0.29	0.26	0.10	0.28	0.82	0.13	0.16
TiO₂	0.83	0.92	1.03	1.06	0.63	0.54	0.54	0.57	0.52	0.48	0.53	0.60	0.53	1.04	1.06	0.47	0.56	0.61	0.60	0.77	0.89	0.67	0.71
FeO^*	2.36	2.49	2.66	2.61	3.47	3.20	3.51	3.35	3.46	3.21	3.20	3.32	3.42	5.45	5.36	5.69	5.43	6.08	6.66	6.00	5.80	6.25	5.69
MnO	12.60	11.80	11.30	10.97	10.72	10.54	10.62	10.73	10.70	10.71	10.98	10.67	11.25	11.72	12.07	11.65	10.39	10.32	10.89	10.18	10.05	10.36	10.31
CaO	0.05	0.04	0.02	0.01	0.01	0.01	0.03	0.02	0.02		0.02	0.03	0.02	0.05	0.01	0.03	0.02	0.03	0.02	0.02	0.03	0.02	0.02
U₂O	0.81	0.71	0.51	0.55	0.14	0.23	0.44	0.04	0.37	0.19	0.18	0.23	0.11	0.80	0.64	0.10	0.27	0.15	0.21	0.20	0.39	0.42	0.33
ThO₂ w_B/%	0.04	0.04	0.05	0.09				0.02	0.09	0.07				0.01	0.04		0.03
PbO	0.15	0.25	0.14	0.11	0.19	0.11	0.24	0.27	0.10	0.09	0.26	0.13	0.09	0.28	0.09	0.24	0.15	0.24	0.11	0.18	0.18	0.25	0.22
Nb₂O₅	40.84	38.02	34.70	34.85	39.48	38.73	37.46	41.10	39.18	37.87	39.23	37.99	37.77	53.65	54.13	58.58	39.05	44.16	59.64	38.82	38.98	54.17	52.28
Ta₂O₅	39.57	42.65	45.76	46.22	41.15	43.05	43.12	40.70	41.96	43.40	42.92	41.99	42.72	25.17	24.83	20.45	42.63	38.46	19.32	42.90	42.65	25.49	29.39
Y₂O₃	0.02				0.01		0.07	0.02		0.01	0.14			0.12	0.29	0.23	0.04		0.12	0.01	0.02	0.11	0.10
Sc₂O₃	0.17	0.19	0.19	0.20	0.16	0.17	0.18	0.16	0.17	0.20	0.21	0.19	0.21	0.11	0.11	0.11	0.19	0.15	0.09	0.19	0.16	0.12	0.13
SnO₂	0.10	0.16	0.03	0.03	0.00		0.02	0.01	0.04	0.03			0.04	0.08		0.02	0.01				0.01		0.04
ZrO₂	0.20	0.47	0.19	0.29	0.32	0.31	0.15	0.32	0.30	0.28	0.34	0.45	0.40	0.35	0.37	0.15	0.19	0.10	0.19	0.14	0.23	0.15	0.14
WO₃	0.55	0.60	0.46	0.63	0.56	0.53	0.76	0.58	0.62	0.59	0.59	0.59	0.67	0.37	0.40	0.31	0.46	0.54	0.30	0.50	0.59	0.48	0.46
总计	98.56	99.23	97.35	98.49	97.11	97.69	97.38	98.12	97.77	97.41	99.36	96.48	97.51	99.35	99.85	98.07	99.72	101.09	98.25	100.19	100.81	98.61	99.96
Ta₂O₅/Nb₂O₅	0.97	1.12	1.32	1.33	1.04	1.11	1.15	0.99	1.07	1.15	1.09	1.11	1.13	0.47	0.46	0.35	1.09	0.87	0.32	1.10	1.09	0.47	0.56
Si	0.018	0.059	0.023	0.061	0.019	0.019	0.017	0.017	0.018	0.021	0.052	0.020	0.020	0.009	0.029	0.004	0.020	0.017	0.006	0.019	0.054	0.008	0.010
Ti	0.042	0.047	0.054	0.055	0.033	0.028	0.028	0.029	0.027	0.025	0.027	0.032	0.027	0.049	0.050	0.022	0.028	0.030	0.028	0.039	0.045	0.032	0.034
Fe²⁺	0.134	0.141	0.156	0.151	0.200	0.184	0.205	0.190	0.199	0.186	0.180	0.194	0.198	0.287	0.279	0.296	0.307	0.331	0.344	0.337	0.322	0.331	0.301
Mn	0.723	0.676	0.674	0.642	0.625	0.616	0.627	0.616	0.623	0.629	0.626	0.631	0.659	0.626	0.636	0.614	0.595	0.569	0.569	0.579	0.564	0.556	0.553
Nb	1.250	1.163	1.104	1.088	1.229	1.207	1.180	1.260	1.219	1.188	1.194	1.198	1.181	1.528	1.522	1.648	1.192	1.300	1.665	1.180	1.169	1.551	1.495
Ta	0.728	0.784	0.876	0.868	0.771	0.807	0.817	0.751	0.785	0.819	0.786	0.797	0.803	0.431	0.420	0.346	0.783	0.681	0.324	0.784	0.769	0.439	0.506
Ca	0.004	0.003	0.002	0.001	0.001	0.001	0.002	0.002	0.002		0.002	0.002	0.002	0.003	0.001	0.002	0.001	0.002	0.001	0.001	0.002	0.001	0.001
U	0.013	0.012	0.009	0.009	0.002	0.004	0.007	0.001	0.006	0.003	0.003	0.004	0.002	0.012	0.010	0.001	0.004	0.002	0.003	0.003	0.006	0.006	0.005
Th	0.001	0.001	0.001	0.001					0.001	0.001					0.001
Pb	0.003	0.005	0.003	0.002	0.003	0.002	0.004	0.005	0.002	0.002	0.005	0.003	0.002	0.005	0.002	0.004	0.003	0.004	0.002	0.003	0.003	0.004	0.004
Y	0.001						0.003	0.001			0.005			0.004	0.010	0.007	0.001		0.004		0.001	0.004	0.003
Sc	0.010	0.011	0.012	0.012	0.010	0.010	0.011	0.009	0.010	0.012	0.012	0.011	0.013	0.006	0.006	0.006	0.011	0.008	0.005	0.011	0.009	0.006	0.007
Sn	0.003	0.004	0.001	0.001					0.001	0.001			0.001	0.002									0.001
Zr	0.007	0.015	0.007	0.010	0.011	0.010	0.005	0.010	0.010	0.010	0.011	0.015	0.013	0.011	0.011	0.004	0.006	0.003	0.006	0.005	0.008	0.005	0.004
W	0.010	0.011	0.008	0.011	0.010	0.010	0.014	0.010	0.011	0.011	0.010	0.011	0.012	0.006	0.006	0.005	0.008	0.009	0.005	0.009	0.010	0.008	0.008
总计	2.945	2.932	2.928	2.913	2.914	2.898	2.922	2.901	2.914	2.907	2.913	2.916	2.932	2.979	2.981	2.961	2.961	2.957	2.964	2.971	2.963	2.952	2.932
Mn/(Mn+Fe)	0.84	0.83	0.81	0.81	0.76	0.77	0.75	0.76	0.76	0.77	0.78	0.76	0.77	0.69	0.70	0.67	0.66	0.63	0.62	0.63	0.64	0.63	0.65
Ta/(Ta+Nb)	0.37	0.40	0.44	0.44	0.39	0.40	0.41	0.37	0.39	0.41	0.40	0.40	0.40	0.22	0.22	0.17	0.40	0.34	0.16	0.40	0.40	0.22	0.25
注：铌钽矿电子探针数据依据6个氧原子计算，FeO^*为全铁数据，样品号下面的数字表示测量点号，空值为低于检测限数据

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表 2 幕阜山地区断峰山铌钽矿U-Pb年代学数据

Table 2. U-Pb age data of columbotantalite from the Duanfengshan mine in Mufushan area

测点号	同位素比值						年龄/Ma
测点号	²⁰⁷Pb/²⁰⁶Pb	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ	²⁰⁷Pb/²⁰⁶Pb	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ
DFS-8_01	0.048 58	0.000 54	0.143 71	0.003 68	0.021 38	0.000 53	127.9	25.9	136.3	3.3	136.3	3.4
DFS-8_02	0.048 39	0.000 63	0.144 05	0.004 16	0.021 62	0.000 57	116.8	31.5	136.6	3.7	137.9	3.6
DFS-8_03	0.050 12	0.000 59	0.149 25	0.002 43	0.021 60	0.000 30	211.2	27.8	141.3	2.2	137.8	1.9
DFS-8_04	0.047 07	0.000 71	0.137 91	0.003 06	0.021 23	0.000 38	53.8	35.2	131.2	2.7	135.4	2.4
DFS-8_05	0.048 07	0.000 76	0.143 63	0.003 24	0.021 53	0.000 38	101.9	37.0	136.3	2.9	137.3	2.4
DFS-8_06	0.050 87	0.000 72	0.151 50	0.002 88	0.021 55	0.000 34	235.3	61.1	143.2	2.6	137.4	2.1
DFS-8_07	0.048 53	0.000 67	0.143 56	0.003 14	0.021 38	0.000 42	124.2	33.3	136.2	2.8	136.4	2.7
DFS-8_08	0.048 95	0.000 70	0.144 72	0.003 30	0.021 37	0.000 42	146.4	33.3	137.2	2.9	136.3	2.7
DFS-8_09	0.047 35	0.000 75	0.140 86	0.003 17	0.021 43	0.000 38	77.9	38.9	133.8	2.8	136.7	2.4
DFS-8_10	0.047 65	0.000 63	0.142 73	0.002 78	0.021 65	0.000 37	83.4	36.1	135.5	2.5	138.1	2.4
DFS-8_11	0.048 53	0.000 62	0.144 11	0.002 90	0.021 40	0.000 35	124.2	29.6	136.7	2.6	136.5	2.2
DFS-8_12	0.048 82	0.000 97	0.147 14	0.004 41	0.021 65	0.000 46	139.0	41.7	139.4	3.9	138.1	2.9
DFS-8_13	0.047 79	0.000 72	0.139 95	0.003 10	0.021 26	0.000 42	87.1	35.2	133.0	2.8	135.6	2.6
DFS-8_14	0.047 22	0.000 79	0.137 93	0.003 94	0.021 17	0.000 52	61.2	38.9	131.2	3.5	135.0	3.3
DFS-8_15	0.048 21	0.000 79	0.141 55	0.003 22	0.021 25	0.000 37	109.4	34.3	134.4	2.9	135.6	2.3
DFS-8_16	0.048 38	0.000 41	0.142 65	0.003 49	0.021 35	0.000 50	116.8	50.9	135.4	3.1	136.2	3.2
DFS-8_17	0.048 02	0.000 39	0.143 66	0.003 88	0.021 68	0.000 57	101.9	20.4	136.3	3.4	138.3	3.6
DFS-8_18	0.048 19	0.000 39	0.143 98	0.004 07	0.021 65	0.000 59	109.4	20.4	136.6	3.6	138.1	3.7
DFS-8_19	0.047 93	0.000 40	0.141 40	0.003 31	0.021 38	0.000 48	94.5	23.2	134.3	3.0	136.4	3.0
DFS-8_20	0.047 89	0.000 36	0.142 78	0.003 25	0.021 59	0.000 47	100.1	23.2	135.5	2.9	137.7	3.0
DFS-10_01	0.048 30	0.000 49	0.143 46	0.002 81	0.021 63	0.000 41	122.3	50.0	136.1	2.5	137.9	2.6
DFS-10_02	0.048 40	0.000 44	0.146 02	0.003 09	0.021 81	0.000 39	120.5	20.4	138.4	2.7	139.1	2.5
DFS-10_03	0.049 32	0.000 47	0.147 31	0.002 57	0.021 73	0.000 35	164.9	24.1	139.5	2.3	138.6	2.2
测点号	同位素比值						年龄/Ma
测点号	²⁰⁷Pb/²⁰⁶Pb	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ	²⁰⁷Pb/²⁰⁶Pb	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ
DFS-10_04	0.047 96	0.000 57	0.143 54	0.002 57	0.021 75	0.000 32	98.2	23.2	136.2	2.3	138.7	2.0
DFS-10_05	0.049 33	0.000 57	0.146 03	0.003 21	0.021 43	0.000 39	164.9	4.6	138.4	2.8	136.7	2.5
DFS-10_06	0.048 59	0.000 55	0.144 53	0.003 06	0.021 61	0.000 39	127.9	25.9	137.1	2.7	137.8	2.5
DFS-10_07	0.048 27	0.000 50	0.142 43	0.003 05	0.021 38	0.000 40	122.3	56.5	135.2	2.7	136.4	2.5
DFS-10_08	0.049 11	0.000 53	0.144 51	0.002 49	0.021 35	0.000 29	153.8	30.6	137.1	2.2	136.2	1.9
DFS-10_09	0.048 76	0.000 56	0.141 07	0.002 44	0.021 04	0.000 30	200.1	27.8	134.0	2.2	134.2	1.9
DFS-10_10	0.049 77	0.000 52	0.146 02	0.002 90	0.021 32	0.000 39	183.4	21.3	138.4	2.6	136.0	2.5
DFS-10_11	0.049 90	0.000 98	0.145 16	0.002 90	0.021 13	0.000 19	190.8	46.3	137.6	2.6	134.8	1.2
DFS-10_12	0.049 34	0.000 54	0.143 69	0.002 42	0.021 17	0.000 31	164.9	4.6	136.3	2.2	135.1	1.9
DFS-10_13	0.049 95	0.000 68	0.145 12	0.003 09	0.021 15	0.000 41	190.8	36.1	137.6	2.7	134.9	2.6
DFS-10_14	0.049 82	0.000 57	0.145 05	0.002 91	0.021 18	0.000 39	187.1	23.1	137.5	2.6	135.1	2.5
DFS-10_15	0.049 02	0.000 53	0.142 24	0.004 16	0.021 04	0.000 59	150.1	24.1	135.0	3.7	134.2	3.7
DFS-10_16	0.049 02	0.000 48	0.142 30	0.003 06	0.021 06	0.000 42	150.1	24.1	135.1	2.7	134.4	2.6
DFS-10_17	0.048 47	0.000 52	0.143 89	0.003 17	0.021 57	0.000 44	124.2	24.1	136.5	2.8	137.6	2.8
DFS-10_18	0.048 38	0.000 74	0.141 52	0.003 33	0.021 25	0.000 41	116.8	35.2	134.4	3.0	135.6	2.6
DFS-10_19	0.048 44	0.000 88	0.142 27	0.002 98	0.021 33	0.000 29	120.5	44.4	135.1	2.7	136.0	1.9
DFS-10_20	0.049 69	0.000 78	0.143 79	0.003 45	0.021 01	0.000 42	189.0	37.0	136.4	3.1	134.0	2.7
DFS-10_21	0.048 67	0.000 51	0.140 37	0.002 79	0.021 00	0.000 40	131.6	30.6	133.4	2.5	134.0	2.5

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