西藏甲岗雪山钨钼矿床成矿流体及成矿物质来源

徐培言; 郑远川; 杨竹森; 沈阳; 王梓轩; 马睿; 吴昌炟

doi:10.3799/dqkx.2019.066

西藏甲岗雪山钨钼矿床成矿流体及成矿物质来源

doi: 10.3799/dqkx.2019.066

徐培言^1, ,,
郑远川^1, ,,
杨竹森²,
沈阳¹,
王梓轩¹,
马睿¹,
吴昌炟¹

1.
中国地质大学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, 北京 100037

基金项目:

国家重点研发计划项目 2016YFC0600310

国家重点研发计划项目 2016YFC0600306

国家重点基础研究发展计划"973"项目 2015CB452600

国家自然科学基金项目 41872083

国家自然科学基金项目 41472076

中国地质调查局地质调查项目 DD20160024-07

中国地质调查局地质调查项目 DD20160026

中国地质调查局地质调查项目 DD20179172

基本科研业务费专项项目 53200859424

详细信息

作者简介:
徐培言(1991-), 男, 在读博士研究生, 矿物学、岩石学、矿床学专业

通讯作者:
郑远川, 副教授

中图分类号: P618.6
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- 被引次数: 0
出版历程
- 收稿日期: 2018-10-23
- 刊出日期: 2019-06-15

Sources of Ore-Forming Fluids and Materials of Jiagangxueshan W-Mo Deposit

1.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

摘要

摘要: 甲岗雪山钨钼矿床位于西藏自治区申扎县境内，是西藏首例云英岩型钨矿床，关于该矿床的研究对探讨区域成矿机制和指导找矿都具有重要意义.成矿作用与矿区内的二长花岗岩紧密相关，矿体主要产于岩体内部和紧邻岩体的围岩中.矿体的类型包括云英岩型和石英脉型，矿石多呈细脉状或者浸染状产在云英岩或云英岩化二长花岗岩体内部，少量呈大脉状产于围岩地层中.为了研究该矿床成矿流体及成矿物质的来源，挑选云英岩型矿体和石英脉型矿体中的黑钨矿、石英进行H、O同位素测试，挑选金属硫化物进行S、Pb同位素测试.结果显示，黑钨矿δ¹⁸O_V-SMOW（‰）值集中在3.7~4.7；石英的δ¹⁸O_水值为2.0‰~4.3‰，δD值为-131‰~-84‰，表明成矿流体主要来源于脱气后的岩浆水，可能混入了极少量大气降水.矿石硫化物δ³⁴S的值为+2.2‰~+5.3‰，表明硫来自岩浆；硫化物的²⁰⁶Pb/²⁰⁴Pb、²⁰⁷Pb/²⁰⁴Pb、²⁰⁸Pb/²⁰⁴Pb值分别为18.582 2~18.797 1、15.671 7~15.760 6、39.462 5~39.501 2，进一步表明成矿物质铅主要来源于中拉萨地体前寒武纪变质基底部分熔融产生的岩浆，可能有少量来自围岩地层.
- 成矿流体 /
- 成矿物质 /
- 钨矿床 /
- 甲岗雪山 /
- 西藏 /
- 矿床
Abstract: Jiagangxueshan W-Mo deposit, Shenzha County, is the first greisen-type W deposit in Tibet. Studying the deposit is of great significance in the regional metallogenic mechanism and prospecting. The mineralization is strongly linked with the monzogranite located in the center of the deposit, and ores usually occur in inner monzogranite or sedimentary wall rocks that are adjacent to the monzogranite. The orebody types of the deposit contain greisen-type and quartz vein-type. The majority of ores distribute in greisens and intensively greisenized monzogranites in the form of veinlets or dissemination, while the minority mainly precipitated in the sedimentary wall rocks, presenting as wide quartz veins. To investigate the sources of ore -forming fluids and materials of Jiagangxueshan W -Mo deposit, wolframites and quartzs, metal sulfides from greisen-and quartz vein-type orebodies are sellected for H, O and S-Pb isotope analysis, respectively. δ¹⁸O_V-SMOW (‰) values of wolframite of the deposit range from 3.7-4.7. The hydrogen and oxygen isotope compositions of the quartzs selected from ores show that the δ¹⁸O_water values of quartzs are ranging from 2.0‰-4.3‰, with the δD values range from -131‰ to -84‰. The H-O data indicate that ore-forming fluids were derived from residual magma water after degassing. δ³⁴S values of the sulfides range from +2.2‰ to +5.3‰, indicative of a magmatic source of sulfur. The values of ²⁰⁶Pb/²⁰⁴Pb、²⁰⁷Pb/²⁰⁴Pb、²⁰⁸Pb/²⁰⁴Pb are 18.582 2-18.797 1、15.671 7-15.760 6、39.462 5-39.501 2, respectively, which further show that the ore-forming materials were derived from Precambrian metamorphic basement of the central Lhasa subterrane.
- ore-forming fluid /
- ore-forming material /
- tungsten deposit /
- Jiagangxueshan /
- Tibet /
- deposits

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图 1 (a) 拉萨地体构造框架图；(b)甲岗雪山W-Mo矿床矿区地质图

a据Zhu et al.（2011）；b.改自程立人等，2002.中华人民共和国1:25万申扎县幅地质图.吉林大学地质调查院，长春

Fig. 1. (a) Tectonic framework of Lhasa terrane; (b) regional geological map of Jiagangxueshan deposit

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图 2 甲岗雪山W-Mo矿床地质简图

改自王治华等（2006b）

Fig. 2. Geological sketch map of Jiagangxueshan W-Modeposit

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图 3 云英岩型矿体和石英脉型矿体野外(a~c)、手标本(d~f)和显微镜下照片(g~i)

a.接触带内的云英岩-黑钨矿脉；b、c.围岩内部的石英-黑钨矿-辉钼矿大脉，黑钨矿在脉内部结晶而辉钼矿沿脉壁结晶；d、g.接触带内的石英-黑钨矿-辉钼矿脉；e、h.云英岩化中粒二长花岗岩内的浸染状黑钨矿；f、i.云英岩化岩体内的浸染状辉钼矿；Wol.黑钨矿；Mo.辉钼矿

Fig. 3. Photographs (a-f) and photomicrographs (g-i) of the greisen-type ores and quartz vein-type orebodies

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图 4 (a) 黑钨矿δ¹⁸O_V-SMOW (‰)频率分布直方图；(b)甲岗雪山钨钼矿床成矿流体δ¹⁸O_水-δD图解

底图据Taylor（1974）；钨锡系列初始岩浆水和再平衡岩浆水范围据张理刚（1987）；文献数据王治华等（2007）

Fig. 4. (a)Histogram of δ¹⁸O_V-SMOW (‰) of wolframite, (b) ore-forming fluid δ¹⁸O_水-δD plot of Jiagangxueshan W-Mo deposit

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图 5 甲岗雪山钨钼矿床硫化物δ³⁴S分布直方图

Fig. 5. Histogram of δ³⁴S(‰) of sulfides from JiagangxueshanW-Mo deposit

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图 6 甲岗雪山钨钼矿床矿石铅同位素构造模式图

底图据Zartman and Doe（1981）；中拉萨地体前寒武纪变质基底数据潘桂棠等（2006）；张泽明等（2010）；花岗斑岩数据引自Fu et al.（2017）；来姑组地层数据程顺波等（2008）

Fig. 6. Pb isotope compositions of sulfides from the Jiagangxueshan W-Mo deposit

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图 7 (a) 甲岗雪山钨钼矿床成矿地球动力学背景示意；(b)甲岗雪山钨钼矿床成矿模式

底图据Hou and Cook（2009）

Fig. 7. (a)Metallogenic geodynamic sketch map of Jiagangxueshan W-Mo deposit, (b) metallogenic model for the JiagangxueshanW-Mo deposit

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表 1 甲岗雪山钨钼矿床黑钨矿及石英的H、O同位素特征

Table 1. Hydrogen and oxygen isotope composition of wolframite and quartz of Jiagangxueshan W-Mo deposit

样号	测试矿物	样品来源	δ¹⁸O(‰)	δ¹⁸O(‰)	δD(‰)	温度(℃)
JG14-17-5	黑钨矿	云英岩型钨矿体	4.3	5.9	-	289
JG14-17-6	黑钨矿	云英岩型钨矿体	4.4	6.0	-	289
JG14-24-1	黑钨矿	云英岩型钨钼矿体	4.6	6.2	-	289
JG14-25-1	黑钨矿	云英岩型钨矿体	4.7	6.3	-	289
JG14-40-3	黑钨矿	云英岩型钨矿体	4.3	5.9	-	289
JG14-52-1	黑钨矿	云英岩型钨矿体	4.2	5.8	-	289
JG14-56-1	黑钨矿	云英岩型钨矿体	3.7	5.3	-	289
JG14-29-2	黑钨矿	石英脉型钨矿体	4.3	5.7	-	272
JG14-33-1	黑钨矿	石英脉型钨矿体	4.3	5.7	-	272
JG14-64-3	黑钨矿	石英脉型钨钼矿体	4.7	6.1	-	272
JG13-11	石英	云英岩型钨矿体	11.1	3.8	-84	289
JG14-11-2	石英	云英岩型钨矿体	12.2	4.9	-131	289
JG14-17-6	石英	云英岩型钨矿体	10.6	3.3	-125	289
JG14-25-1	石英	云英岩型钨矿体	10.8	3.5	-119	289
JG14-52-1	石英	云英岩型钨矿体	10.7	3.4	-90	289
JG14-63-6	石英	云英岩型钨钼矿体	10.4	3.1	-91	289
JG13-12	石英	石英脉型钨矿体	10.5	2.6	-99	272
JG14-29-1	石英	石英脉型钼钨矿体	10.4	2.5	-106	272
JG13-15	石英	围岩内不含矿石英脉	10	0.2	-104	232
JG14-32-3	石英	围岩内不含矿石英脉	10.6	0.8	-123	232
JG14-50-3	石英	围岩内不含矿石英脉	11.6	1.8	-101	232

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表 2 甲岗雪山钨钼矿床硫化物硫同位素数据

Table 2. Sulfur isotope composition of sulfides from Jia-gangxueshan W-Mo deposit

样号	测试矿物	样品来源	δ³⁴S(‰)
JG13-1	辉钼矿	云英岩型矿体	4.3
JG13-2-1	辉钼矿	云英岩型矿体	5.0
JG13-2-2	辉钼矿	云英岩型矿体	4.4
JG14-63-5	辉钼矿	云英岩型矿体	5.0
JG14-20-4	黄铁矿	云英岩型矿体	4.7
JG14-20-5	黄铁矿	云英岩型矿体	4.8
JG14-59-1	方铅矿	云英岩型矿体	2.2
JG13-2	辉钼矿	石英脉型矿体	4.2
JG14-28-2	辉钼矿	石英脉型矿体	5.0
JG14-29-1	辉钼矿	石英脉型矿体	5.3
JG14-32-2	辉钼矿	石英脉型矿体	5.2
JG14-64-3	辉钼矿	石英脉型矿体	4.5
JG14-29-3	黄铁矿	石英脉型矿体	4.9
JG14-32-2	黄铁矿	石英脉型矿体	4.9
JG14-28-1	黄铜矿	石英脉型矿体	5.3

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表 3 甲岗雪山钨钼矿床矿石Pb同位素组成数据

Table 3. Pb isotope composition of sulfides from Jiagangxue-shan W-Mo deposit

样号	测试矿物	样品来源	²⁰⁶Pb/ ²⁰⁴Pb	²⁰⁷Pb/ ²⁰⁴Pb	²⁰⁸Pb/ ²⁰⁴Pb
JG14-63-5	辉钼矿	云英岩型矿体	18.716 4	15.731 6	39.272 4
JG14-20-4	黄铁矿	云英岩型矿体	18.776 0	15.750 9	39.462 5
JG14-20-5	黄铁矿	云英岩型矿体	18.780 1	15.752 1	39.472 8
JG14-59-1	方铅矿	云英岩型矿体	18.782 3	15.753 0	39.479 8
JG13-2	辉钼矿	石英脉型矿体	18.797 1	15.760 6	39.501 2
JG14-28-2	辉钼矿	石英脉型矿体	18.608 8	15.691 1	39.043 4
JG14-29-1	辉钼矿	石英脉型矿体	18.584 0	15.671 7	38.889 7
JG14-32-2	辉钼矿	石英脉型矿体	18.784 2	15.756 2	39.480 1
JG14-64-3	辉钼矿	石英脉型矿体	18.582 2	15.689 1	39.019 8
JG14-64-6	辉钼矿	石英脉型矿体	18.675 7	15.706 3	39.118 0
JG14-29-3	黄铁矿	石英脉型矿体	18.754 4	15.745 8	39.409 8
JG14-32-2	黄铁矿	石英脉型矿体	18.607 1	15.722 7	39.150 6
JG14-28-1	黄铜矿	石英脉型矿体	18.769 8	15.748 9	39.443 0

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