藏南然巴晚中新世矽卡岩型钨矿化特征及地质意义

任春萌; 郑远川; 李鑫; 高雷; 徐培言; 吴昌炟; 杨竹森

doi:10.3799/dqkx.2023.139

藏南然巴晚中新世矽卡岩型钨矿化特征及地质意义

doi: 10.3799/dqkx.2023.139

任春萌^1, ,,
郑远川^1, ,,
李鑫¹,
高雷¹,
徐培言²,
吴昌炟³,
杨竹森⁴

1.
中国地质大学地球科学与资源学院, 北京 100083
2.
中国地质调查局成都地质调查中心, 四川成都 610081
3.
中国地质科学院地质研究所, 北京 100037
4.
中国地质科学院矿产资源研究所, 北京 100037

基金项目:

优秀青年科学基金项目 4202290261

碰撞造山带典型地区岩石圈三维物质架构的示踪方法 2019YFA0708602

详细信息

作者简介:
任春萌(1998-)，女，硕士研究生，矿物学、岩石学、矿床学专业，ORCID：0009-0002-2607-1651. E-mail：renchunmeng2021@163.com

通讯作者:
郑远川(1982-)，男，教授，主要从事矿床学研究. E-mail: zheng_yc@126.com

中图分类号: P618.67
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出版历程
- 收稿日期: 2023-03-13
- 网络出版日期: 2024-11-08
- 刊出日期: 2024-10-25

Characteristics and Geological Significance of Late Miocene Skarn-Type Tungsten Mineralization in Ramba, Southern Tibet

1.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2.
Chengdu Center, China Geological Survey, Chengdu 610081, China
3.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
4.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

摘要

摘要: 然巴岩体位于北喜马拉雅带东段，主要岩石类型为二云母花岗岩，与之接触的斜长角闪岩普遍发生矽卡岩化，并伴随有白钨矿化.为限定成岩成矿年龄和成矿流体性质，采用锆石U-Pb定年、云母Ar-Ar定年、矿物地球化学等分析方法开展研究.含钨石英脉中白云母Ar-Ar年龄(6.3 Ma)与二云母花岗岩锆石U-Pb年龄(7.3 Ma)相当，表明花岗岩的侵位及相关的钨成矿作用均发生于晚中新世，为迄今区域内已知最年轻的稀有金属成矿事件.矽卡岩内石榴子石与辉石矿物对的含铁率比值(3.12~3.74)与白钨矿极低的Mo含量(12.0×10^-6~56.8×10^-6)显示成矿流体为还原性，与岩浆锆石氧逸度计结果(∆FMQ=-5.78~-2.08)一致.白钨矿稀土元素特征明显继承自花岗岩，指示岩浆出溶的成矿流体与富钙围岩发生反应诱发了白钨矿的沉淀.研究揭示喜马拉雅淡色花岗岩与围岩的接触变质带为稀有金属有利的成矿部位，需给予更多关注.
- 喜马拉雅淡色花岗岩 /
- 接触变质带 /
- 钨成矿作用 /
- 然巴 /
- 矿床学
Abstract: The Ramba leucogranite, located in the eastern part of the Northern Himalaya, is mainly composed of two-mica granite. The amphibolite in contact with it is commonly skarnized and accompanied by scheelite mineralization. To qualify the diagenetic and metallogenic ages and the ore-forming fluid characters, an integrated approach involving zircon U-Pb and mica Ar-Ar dating, and mineral geochemistry was carried out. The Ar-Ar age (6.3 Ma) of muscovite from the scheelite-bearing quartz vein yielded is comparable to the zircon U-Pb age (7.3 Ma) of two-mica granite, indicating that the granite emplacement and associated tungsten mineralization both occurred in the Late Miocene, which is the youngest known rare-metal mineralization event in the region. The iron ratios of garnet and pyroxene mineral pairs within the scheelite-bearing skarn (3.12 to 3.74), and the relatively low Mo content (12.0×10^-6-56.8×10^-6) of scheelite, collectively indicate that the ore-forming fluid is reduced, which is consistent with the magmatic zircon oxygen fugacity calculated results (ΔFMQ=-5.78 to -2.08). The rare-earth element characteristics of scheelite are inherited from the leucogranite granite, further indicating that the W-rich ore-forming fluid was dissolved from the evolved granitic melt and subsequently reacted with the Ca-rich wall rocks to induce the precipitation of scheelite. This study reveals that the contact metamorphic zone between Himalayan leucogranite and surrounding wall rock is a favorable site for rare-metals, and deserves attention in future prospecting.
- Himalaya leucogranite /
- contact metamorphic zone /
- tungsten mineralization /
- Ramba /
- mineralogy

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图 1 青藏高原大地构造图(a)；喜马拉雅淡色花岗岩位置图(b)；然巴穹窿构造简图(b)

a.据潘桂棠等(2004)；b.据Zheng et al.(2016)；c.据Liu et al.(2014)

Fig. 1. Tectonic of Tibetan Plateau (a); location map of Himalayan leucogranite (b); simplified geologic map of the Ramba dome (c)

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图 2 然巴地区野外露头及手标本照片

a.岩体与矽卡岩接触带露头；b.二云母花岗岩；c.含石榴子石白云母花岗岩；d.钠长石花岗岩脉穿切围岩；e.石榴子石矽卡岩；f.含符山石石榴子石透辉石矽卡岩；g.石榴子石透辉石矽卡岩；h.矽卡岩内细脉浸染状白钨矿；i.围岩中的石英脉；j.矽卡岩与石英脉的接触关系；k.热液白云母发育于含钨石英脉中.Gro.钙铝榴石；Di.透辉石；Sch.白钨矿；Ves.符山石

Fig. 2. Photographs of field outcrop and hand specimens in Ramba area

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图 3 然巴白钨矿镜下照片

a~b.石榴子石与透辉石共生并叠加有后期白钨矿矿化；c~d.方柱石；e~f.白钨矿与符山石共生；g~h.透辉石被绿泥石、绿帘石交代；i~l.白钨矿与绿泥石、绿帘石共生；m.透闪石；n.矽卡岩中的萤石脉；o~p.白钨矿与萤石共生.Gro.钙铝榴石；Sch.白钨矿；Di.透辉石；Ep.绿帘石；Scp.方柱石；Chl.绿泥石；Ves.符山石；Tr.透闪石；Cal.方解石；Fl.萤石

Fig. 3. Micrographs in scheelite at Ramba

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图 4 然巴穹隆内矽卡岩化矿物共生组合关系

Fig. 4. Mineral paragenesis for skarn in Ramba

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图 5 然巴二云母花岗岩中锆石CL图(a)；然巴二云母花岗岩锆石U-Pb谐和年龄图(b)；然巴二云母花岗岩锆石加权平均年龄图(c)

Fig. 5. CL images of zircons from two-mica granite in Ramba (a); concordant ages of zircon from two-mica granite in Ramba(b); weighted average ages of zircon from two-mica granite in Ramba (c)

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图 6 然巴二云母花岗岩锆石稀土元素配分图(a)；然巴二云母花岗岩锆石氧逸度计算结果(b)

a.标准化值据Sun and McDonough(1989)；b.底图据Loucks et al.(2020). FMQ. Fe₂SiO₄-Fe₃O₄-SiO₂；NNO-Ni-NiO；HM. Fe₂O₃-Fe₃O₄

Fig. 6. Normalized REE pattern of two-mica granite in Ramba (a); calculated oxygen fugacities of zircons from the two-mica granite in Ramba (b)

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图 7 然巴地区石英脉中白云母Ar-Ar年龄谱图

a.白云母⁴⁰Ar/³⁹Ar坪年龄；b.白云母⁴⁰Ar/³⁹Ar等时线年龄；c.白云母⁴⁰Ar/³⁹Ar反等时线年龄

Fig. 7. The Ar-Ar age spectra of muscovites from greisen at Ramba

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图 8 然巴矽卡岩中石榴子石、辉石端元组成

Gro.钙铝榴石；And.钙铁榴石；Pry.镁铝榴石；Spe.锰铝榴石；Di.透辉石；Hd.钙铁辉石；Jo.钙锰辉石. 底图据赵一鸣等(1990)

Fig. 8. The end members of garnet and pyroxene in skarn

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图 9 白钨矿(REE+Y-Eu)-Na图解(a)；白钨矿(REE+Y-Eu)-Nb图解(b)

Fig. 9. Plot of Na vs. ∑REE+Y-Eu (a) plot of Nb vs. ∑REE (b)

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图 10 白钨矿中微量元素与δEu变化图解

Fig. 10. Trace elements and δEu diagrams in scheelite

a. Eu vs. δEu; b.REE vs. δEu; c. Sr vs. δEu; d. Nb/Ta vs. δEu

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图 11 然巴矽卡岩中共生的石榴石和辉石含铁率(Kp)比值(a)；白钨矿MoO₃和WO₃比值投点图(b)

a.底图据赵一鸣等(1990)；b. 底图来自Sun and Chen(2017)

Fig. 11. Ratio of iron content (Kp) of garnet to pyroxene coexisting in skarn at Ramba (a); point diagram of MoO₃ and WO₃ ratio of scheelite (b)

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图 12 然巴白钨矿球粒陨石标准化稀土元素配分模式图

标准化值据Sun and McDonough(1989)；然巴淡色花岗岩全岩数据来源于刘志超(2013)

Fig. 12. Normalized REE pattern of scheelite from Ramba

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表 1 LA-ICP-MS锆石U-Pb同位素分析结果

Table 1. Analysis results of LA-ICP-MS zircon U-Pb isotopic dating

品号	Pb(10^-6)	Th(10^-6)	U(10^-6)	Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁶Pb/²³⁸U
品号	Pb(10^-6)	Th(10^-6)	U(10^-6)	Th/U	比值	1σ	比值	1σ	比值	1σ	年龄 (Ma)	1σ
RB17-1	1.80	209	1611	0.13	0.052 78	0.007 02	0.006 53	0.000 57	0.001 04	0.000 03	6.7	0.2
RB17-2	3.30	308	2815	0.11	0.049 68	0.003 78	0.007 34	0.000 48	0.001 10	0.000 03	7.1	0.2
RB17-3	3.11	302	2674	0.11	0.047 84	0.004 18	0.006 79	0.000 51	0.001 07	0.000 03	6.9	0.2
RB17-4	3.63	413	3186	0.13	0.047 88	0.004 19	0.006 76	0.000 52	0.001 07	0.000 03	6.9	0.2
RB17-5	4.79	171	4438	0.04	0.047 70	0.004 54	0.006 52	0.000 46	0.001 09	0.000 03	7.0	0.2
RB17-6	2.41	310	1889	0.16	0.046 10	0.004 95	0.006 75	0.000 64	0.001 10	0.000 03	7.1	0.2
RB17-7	1.56	123	1358	0.09	0.050 90	0.005 17	0.007 12	0.000 56	0.001 10	0.000 04	7.1	0.3
RB17-8	4.06	337	3583	0.09	0.048 28	0.003 45	0.007 05	0.000 43	0.001 10	0.000 03	7.1	0.2
RB17-9	8.29	325	7601	0.04	0.046 90	0.002 04	0.007 06	0.000 32	0.001 09	0.000 02	7.1	0.2
RB17-10	3.36	396	2530	0.16	0.048 56	0.003 99	0.007 99	0.000 62	0.001 21	0.000 03	7.8	0.2
RB17-11	3.55	317	2893	0.11	0.051 44	0.004 77	0.007 61	0.000 57	0.001 19	0.000 04	7.7	0.2
RB17-12	1.46	129	1171	0.11	0.049 92	0.005 60	0.007 44	0.000 60	0.001 17	0.000 04	7.5	0.2
RB17-13	0.939	102	733	0.14	0.05648	0.011 75	0.007 51	0.000 77	0.001 20	0.000 06	7.7	0.4
RB17-14	1.16	111	949	0.12	0.060 61	0.006 83	0.008 56	0.000 87	0.001 18	0.000 05	7.6	0.3
RB17-15	16.8	379	13451	0.03	0.048 07	0.001 57	0.008 03	0.000 28	0.00120	0.000 02	7.7	0.1
RB17-16	1.37	118	1077	0.11	0.049 88	0.006 25	0.007 23	0.000 70	0.001 15	0.000 04	7.4	0.2
RB17-17	2.42	237	1913	0.12	0.050 10	0.004 04	0.008 16	0.000 63	0.001 19	0.000 03	7.7	0.2

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表 2 然巴岩体锆石微量元素分析结果(10^-6)

Table 2. Analysis results of trace elements in zircon

样品	RB17-1	RB17-2	RB17-3	RB17-4	RB17-5	RB17-6	RB17-7	RB17-8	RB17-9
La	-	0.01	0.01	0.01	0.01	0.01	-	-	0.01
Ce	5.44	4.36	5.80	5.89	1.83	11.93	1.58	4.87	4.63
Pr	0.12	0.17	0.21	0.22	0.13	0.18	0.05	0.11	0.13
Nd	3.33	3.23	2.92	5.03	2.25	3.85	1.06	3.46	3.07
Sm	9.46	10.42	11.08	14.44	7.50	10.56	3.78	11.04	13.41
Eu	0.74	0.75	0.69	0.84	0.65	1.35	0.13	0.60	1.19
Gd	47.1	65.5	64.3	80.1	50.0	56.8	26.4	71.9	90.9
Tb	13.9	20.4	19.9	24.4	18.3	17.4	8.2	23.7	31.6
Dy	126	204	194	230	219	172	82	248	341
Ho	37.5	65.0	61.8	71.7	75.9	55.8	24.5	80.5	115.0
Er	140	256	238	279	325	212	96	309	447
Tm	24.4	48.0	42.7	50.1	62.2	39.2	18.0	58.3	91.5
Yb	199	396	370	403	518	301	143	461	742
Lu	37.1	77.7	68.9	77.1	92.8	56.3	27.8	88.7	133.0
REE	643	1 152	1 080	1 241	1 374	939	432	1 362	2 014
LREE	19.1	18.9	20.7	26.4	12.4	27.9	6.6	20.1	22.4
HREE	624	1 133	1 059	1 215	1361	911	426	1 341	1 992
δEu	0.09	0.07	0.06	0.06	0.08	0.14	0.03	0.05	0.08
LREE/HREE	0.03	0.02	0.02	0.02	0.01	0.03	0.02	0.01	0.01
logfO₂	-16.8	-17.7	-17.2	-17.1	-20.8	-15.0	-19.2	-17.6	-18.9
ΔFMQ	-3.22	-4.07	-3.47	-3.78	-5.11	-2.37	-4.90	-4.17	-4.50
样品	RB17-10	RB17-11	RB17-12	RB17-13	RB17-14	RB17-15	RB17-16	RB17-17
La	0.03	0.01	-	-	0.01	0.02	0.01	0.01
Ce	5.38	13.18	2.27	2.26	4.05	2.06	2.49	4.00
Pr	0.18	0.17	0.06	0.03	0.09	0.07	0.09	0.05
Nd	3.73	2.68	1.97	1.44	1.77	1.79	1.74	2.71
Sm	12.64	9.78	5.54	3.22	4.96	11.21	6.53	9.15
Eu	1.01	1.80	0.46	0.34	0.59	0.43	0.44	0.61
Gd	76.2	69.8	31.2	23.3	26.8	93.3	35.7	58.7
Tb	23.3	24.3	8.8	6.5	8.1	37.2	10.3	18.3
Dy	218	254	91	63	83	392	97	176
Ho	69.2	86.2	30.2	20.5	29.6	119.4	27.1	55.2
Er	278	340	130	80	125	460	98	213
Tm	51.4	61.6	26.2	15.1	24.4	84.6	17.9	40.4
Yb	435	509	233	129	221	663	140	329
Lu	84.8	97.8	50.0	26.2	44.9	110.1	26.3	63.1
REE	1 259	1 471	611	371	574	1 976	463	970
LREE	22.9	27.6	10.3	7.3	11.5	15.6	11.3	16.5
HREE	1 236	1 443	600	363	563	1 960	452	953
δEu	0.08	0.15	0.08	0.09	0.13	0.03	0.07	0.06
LREE/HREE	0.02	0.02	0.02	0.02	0.02	0.01	0.02	0.02
logfO₂	-17.5	-15.9	-18.6	-18.4	-17.6	-21.7	-18.4	-17.7
ΔFMQ	-3.42	-2.08	-4.10	-3.54	-2.76	-5.78	-3.83	-3.73

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表 3 然巴地区石英脉中白云母⁴⁰Ar/³⁹Ar同位素年龄分析结果

Table 3. ⁴⁰Ar/³⁹Ar isotopic ages of muscovite in quartz vein from Ramba

T(℃)	⁴⁰Ar/³⁹Ar	1σ	³⁷Ar/³⁹Ar	1σ	³⁶Ar/³⁹Ar	1σ	⁴⁰Ar(%)	³⁹Ar(%)	Age(Ma)	±2σ(Ma)
680	51.816 1	0.090 4	0	0.035 9	0.172 1	0.001 2	1.86	0.57	9.6	7.1
740	64.975 1	0.110 8	0	0.031 2	0.217 7	0.001 5	1.01	1.12	6.6	8.6
780	8.787 8	0.014 4	0.016 0	0.011 5	0.027 8	0.000 3	6.61	1.85	5.8	1.5
870	6.287 5	0.010 1	0	0.005 2	0.018 4	0.000 2	13.71	3.47	8.6	1.0
910	2.382 8	0.003 8	0	0.001 0	0.005 9	0	27.26	15.37	8.5	0.2
940	1.398 4	0.002 4	0	0.000 7	0.002 6	0	45.83	31.53	6.4	0.1
970	1.104 8	0.001 8	0	0.001 4	0.001 6	0	56.23	13.57	6.2	0.1
1 000	1.346 4	0.002 2	0	0.002 4	0.002 5	0	45.57	8.62	6.2	0.3
1 040	1.686 1	0.002 7	0	0.004 6	0.003 5	0.000 1	38.03	5.15	5.4	0.4
1 090	1.696 5	0.002 7	0	0.002 2	0.003 6	0.000 1	36.39	5.61	6.2	0.4
1 190	1.217 9	0.002 0	0.000 4	0.002 2	0.002 0	0	50.17	12.17	6.1	0.2
1 300	5.189 0	0.008 7	0	0.024 7	0.015 4	0.000 5	12.21	0.96	6.3	2.8

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表 4 然巴石榴子石、辉石电子探针分析结果(%)

Table 4. Results of EPAM analysis of garnet and pyroxene from Ramba

样品	Grt-1	Grt-2	Grt-3	Grt-4	Grt-5	样品	Px-1	Px-2	Px-3	Px-4	Px-5
SiO₂	38.82	38.11	38.10	38.09	37.99	SiO₂	50.40	50.12	49.71	49.95	49.53
TiO₂	0.16	0.37	0.33	0.35	0.34	TiO₂	0	0.04	0.04	0	0.05
Al₂O₃	20.62	20.40	20.17	20.37	20.37	Al₂O₃	0.33	0.31	0.62	0.19	0.66
Cr₂O₃	0.06	0.07	0.02	0	0	Cr₂O₃	0.04	0.02	0.01	0.06	0.04
^TFeO	5.61	6.13	6.05	5.93	6.57	^TFeO	17.29	16.80	18.19	18.71	18.91
MnO	0.39	0.28	0.25	0.26	0.35	MnO	0.19	0.16	0.39	0.36	0.34
MgO	0.06	0.10	0.10	0.13	0.08	MgO	6.76	7.16	6.09	5.81	5.50
CaO	34.08	33.60	33.77	34.09	33.37	CaO	23.85	24.07	23.71	23.49	23.59
Na₂O	0	0	0.01	0	0	Na₂O	0.07	0.08	0.13	0.11	0.13
K₂O	0	0	0.01	0	0.01	K₂O	0.01	0	0	0.01	0
SrO	0.11	0.10	0.14	0.09	0.11	SrO	0.17	0.14	0.13	0.19	0.15
NiO	0	0	0.03	0.02	0.02	NiO	0.04	0.01	0.05	0.00	0.04
总量	99.90	99.15	98.96	99.32	99.19	总量	99.14	98.91	99.06	98.87	98.93
N^Fe	0.04	0.05	0.05	0.05	0.05	N^Fe	0.14	0.14	0.15	0.16	0.16
基于12个氧原子计算阳离子数						基于6个氧原子计算阳离子数
Si⁴⁺	2.99	2.96	2.97	2.96	2.96	Si⁴⁺	1.99	1.98	1.98	2.00	1.98
Ti⁴⁺	0.01	0.02	0.02	0.02	0.02	Ti⁴⁺	0	0	0	0	0
Al³⁺	1.87	1.87	1.85	1.86	1.87	Al³⁺	0.02	0.01	0.03	0.01	0.03
Cr³⁺	0	0	0	0	0	Cr³⁺	0	0	0	0	0
Fe²⁺	0.16	0.16	0.13	0.11	0.16	Fe²⁺	0.56	0.52	0.57	0.61	0.61
Fe³⁺	0.20	0.23	0.26	0.27	0.26	Fe³⁺	0.01	0.03	0.03	0.01	0.02
Mn²⁺	0.03	0.02	0.02	0.02	0.02	Mn²⁺	0.01	0.01	0.01	0.01	0.01
Mg²⁺	0.01	0.01	0.01	0.02	0.01	Mg²⁺	0.40	0.42	0.36	0.35	0.33
Ca²⁺	2.79	2.78	2.80	2.82	2.77	Ca²⁺	1.00	1.02	1.01	1.00	1.00
Na⁺	0	0	0	0	0	Na⁺	0.01	0.01	0.01	0.01	0.01
K⁺	0	0	0	0	0	K⁺	0	0	0	0	0
Sr⁺	0	0	0.01	0	0	Sr⁺	0	0	0	0	0
Ni⁺	0	0	0.002	0.001	0.001	Ni⁺	0	0	0	0	0
And	0.284 8	0.280 3	0.280 2	0.286 7	0.279 3	Di	0.413 9	0.446 8	0.382 1	0.356 4	0.343 8
Gro	0.706 4	0.711 6	0.711 2	0.705 7	0.711 9	Hd	0.579 4	0.547 6	0.604 0	0.631 0	0.644 1
Pyr+Spe	0.008 8	0.008 1	0.008 6	0.007 6	0.008 8	Jo	0.006 6	0.005 7	0.013 9	0.012 5	0.012 1

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表 5 然巴白钨矿微量元素含量(10^-6)

Table 5. Contents of trace elements in scheelite of Ranba

样品	白钨矿Ⅰ							白钨矿Ⅱ
样品	RB17-19-1	RB17-19-2	RB17-19-3	RB17-19-4	RB17-19-5	RB17-19-6		RB19-16-1	RB19-16-2	RB19-16-3
La	12.4	13.4	11.9	21.1	23.9	22.0		44.9	20.5	38.0
Ce	40.8	59.5	47.1	86.6	81.5	75.0		61.1	33.0	51.7
Pr	9.81	14.00	10.50	19.90	17.80	16.40		4.95	3.16	4.43
Nd	74.5	97.9	73.2	124.0	110.0	112.0		12.8	11.3	13.1
Sm	33.60	40.50	25.00	40.30	34.20	32.60		1.88	2.15	2.29
Eu	8.73	10.60	5.78	8.55	10.10	8.29		2.52	1.33	2.48
Gd	47.70	52.80	32.20	47.70	39.90	39.30		1.32	1.73	1.87
Tb	5.78	6.58	4.63	6.87	5.17	4.56		0.17	0.29	0.33
Dy	26.30	31.10	25.70	37.50	25.70	21.70		1.18	1.74	2.09
Ho	4.57	5.43	5.39	7.48	4.36	3.41		0.21	0.35	0.43
Er	8.05	10.80	11.80	17.80	8.48	6.24		0.58	0.94	1.13
Tm	0.63	0.9	1.08	1.81	0.77	0.48		0.08	0.13	0.23
Yb	2.22	3.64	5.20	8.04	2.80	1.54		0.68	0.99	1.72
Lu	0.24	0.48	0.56	0.92	0.31	0.14		0.08	0.15	0.23
Y	60.80	78.30	73.60	129.00	63.40	46.70		5.57	11.40	13.30
Sr	141	135	169	121	146	107		41.1	76.6	91.9
Mo	140.0	137.0	122.0	120.0	137.0	121.0		55.7	23.5	33.3
Na	8.66	2.92	6.43	0.87	3.06	2.48		2.63	3.41	5.98
Nb	19.40	18.00	13.10	9.44	22.60	11.00		5.66	5.23	10.80
W	587 427	588 605	487 233	494 681	496 083	521 251		487 233	494 681	496 083
∑REE	275.0	348.0	260.0	428.0	365.0	343.0		132.0	77.7	120.0
δEu	0.67	0.70	0.62	0.60	0.83	0.71		4.65	2.04	3.55
Nb/Ta	177.0	186.0	264.0	90.5	212.0	99.8		60.5	73.9	58.1
样品	白钨矿Ⅱ
样品	RB19-16-4	RB19-16-5	RB19-16-6	RB17-5-1	RB17-5-2	RB17-5-3	RB17-5-4	RB17-5-5	RB17-5-6
La	31.0	28.2	30.7	23.8	15.2	15.4	11.2	23.8	12.9
Ce	48.5	46.0	45.9	39.7	34.0	26.7	17.4	41.8	17.6
Pr	4.69	4.59	4.25	3.67	4.15	2.89	1.69	4.43	1.62
Nd	14.50	15.40	12.40	13.00	18.10	12.30	6.18	16.60	5.38
Sm	3.05	3.23	2.23	3.45	5.56	3.80	1.69	4.34	1.39
Eu	1.71	2.02	2.04	3.65	2.46	1.79	1.48	3.59	1.09
Gd	2.17	2.64	1.75	4.25	6.07	4.39	2.15	4.83	1.73
Tb	0.35	0.43	0.30	0.66	1.00	0.65	0.35	0.78	0.25
Dy	2.25	2.72	1.68	4.70	5.14	3.88	2.52	4.67	1.80
Ho	0.45	0.56	0.34	0.91	1.09	0.77	0.52	0.83	0.37
Er	1.13	1.55	0.87	2.65	2.49	2.03	1.55	2.25	1.13
Tm	0.22	0.25	0.12	0.39	0.31	0.26	0.26	0.28	0.16
Yb	1.30	1.96	0.88	2.62	1.77	1.42	1.81	2.39	1.31
Lu	0.17	0.25	0.12	0.38	0.28	0.25	0.34	0.35	0.18
Y	13.00	17.30	8.66	25.70	24.40	16.80	16.60	18.20	8.55
Sr	145.0	70.7	38.7	110.0	145.0	93.8	28.4	30.8	146.0
Mo	34.5	40.1	56.8	22.7	12.0	45.8	29.2	35.3	19.1
Na	2.49	1.46	2.79	6.77	96.1	6.02	5.04	6.05	2.57
Nb	5.23	5.60	5.56	5.52	3.94	3.89	5.74	4.50	4.48
W	521 251	524 023	540 620	549 650	520 036	594 242	574 932	593 810	584 468
∑REE	111.0	110.0	104.0	104.0	97.6	76.6	49.2	111.0	46.9
δEu	1.93	2.05	3.05	2.91	1.29	1.33	2.37	2.39	2.15
Nb/Ta	52.1	59.9	53.5	64.5	39.3	37.7	45.8	44.7	61.8

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表 6 喜马拉雅淡色花岗岩相关的稀有金属成矿年龄汇总

Table 6. Summary of ages for the rare-metal mineralizations related to the Himalayan leucogranites

岩体名称	成矿元素组合	成矿类型	成矿花岗岩岩石类型	成矿年龄	数据来源
夏如	Be-Nb-Ta、 Nb-Ta-W	伟晶岩型、花岗岩型	花岗伟晶岩电气石-石榴子石花岗岩	33~34 Ma	谢磊等(2021)
珠峰地区	Li、Be、Nb-Ta	伟晶岩型	伟晶岩	23~25 Ma	Liu et al.(2020)
拉隆	Be	伟晶岩型	伟晶岩	23.19 Ma	黄勇等(2019)
Be-W-Sn-Nb-Ta	矽卡岩型	白云母花岗岩	23.23 Ma
库曲	Li、Be-Nb-Ta	伟晶岩型	花岗伟晶岩	22 Ma	周起风等(2021)
错那洞	W-Sn-Be	矽卡岩型锡石石英脉型锡石硫化物型伟晶岩型	二云母花岗岩、白云母花岗岩	14 Ma	Xie et al.(2020)
Nb-Ta	伟晶岩型	伟晶岩	17 Ma
错那	Nb-Ta	伟晶岩型	伟晶岩	12.2 Ma	谢磊等(2021)

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藏南然巴晚中新世矽卡岩型钨矿化特征及地质意义

doi: 10.3799/dqkx.2023.139

作者简介:
任春萌(1998-)，女，硕士研究生，矿物学、岩石学、矿床学专业，ORCID：0009-0002-2607-1651. E-mail：renchunmeng2021@163.com

通讯作者:
郑远川(1982-)，男，教授，主要从事矿床学研究. E-mail: zheng_yc@126.com

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Characteristics and Geological Significance of Late Miocene Skarn-Type Tungsten Mineralization in Ramba, Southern Tibet

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留言板

藏南然巴晚中新世矽卡岩型钨矿化特征及地质意义

doi: 10.3799/dqkx.2023.139

作者简介: 任春萌(1998-)，女，硕士研究生，矿物学、岩石学、矿床学专业，ORCID：0009-0002-2607-1651. E-mail：renchunmeng2021@163.com

通讯作者: 郑远川(1982-)，男，教授，主要从事矿床学研究. E-mail: zheng_yc@126.com

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出版历程

Characteristics and Geological Significance of Late Miocene Skarn-Type Tungsten Mineralization in Ramba, Southern Tibet

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出版历程

目录

作者简介:
任春萌(1998-)，女，硕士研究生，矿物学、岩石学、矿床学专业，ORCID：0009-0002-2607-1651. E-mail：renchunmeng2021@163.com

通讯作者:
郑远川(1982-)，男，教授，主要从事矿床学研究. E-mail: zheng_yc@126.com