湖北来凤革勒车地区铅锌-萤石矿流体包裹体与C-H-O-S-Pb同位素特征及其地质意义

罗华; 郭盼; 刘力; 潘龙克; 段先锋; 毛启曦; 廖明芳

doi:10.19509/j.cnki.dzkq.tb20220242

湖北来凤革勒车地区铅锌-萤石矿流体包裹体与C-H-O-S-Pb同位素特征及其地质意义

doi: 10.19509/j.cnki.dzkq.tb20220242

罗华^{1, 2, ,},
郭盼^{1, 2},
刘力^{1, 2},
潘龙克¹,
段先锋¹,
毛启曦¹,
廖明芳¹

1.
湖北省地质调查院, 武汉 430034
2.
资源与生态环境地质湖北省重点实验室, 武汉 430034

基金项目:

中国地质调查局项目 DD20160029-15

详细信息

通讯作者:
罗华, E-mail: 270132397@qq.com

中图分类号: P618.42;P618.43
计量
- 文章访问数: 171
- PDF下载量: 41
- 被引次数: 0
出版历程
- 收稿日期: 2022-05-26
- 录用日期: 2022-08-30
- 修回日期: 2022-08-29

Fluid inclusion and C-H-O-S-Pb isotope characteristics and geological significance of lead-zinc-fluorite deposits in the Geleche area, Laifeng, Hubei Province

LUO Hua^{1, 2
, ,},
GUO Pan^{1, 2},
LIU Li^{1, 2},
PAN Longke¹,
DUAN Xianfeng¹,
MAO Qixi¹,
LIAO Mingfang¹

1.
Hubei Geological Survey, Wuhan 430034, China
2.
Hubei Provincial Key Laboratory of Resource and Ecological Environment Geology, Wuhan 430034, China

More Information

Corresponding author: LUO Hua, E-mail: 270132397@qq.com

摘要

摘要:
鄂西南地区铅锌矿化分布广泛，但至今未发现大型矿床，对成矿系统的研究亦存在不足。对来凤革勒车地区铅锌-萤石矿流体包裹体进行了显微测温及C-H-O-S-Pb同位素测试分析。结果表明：区内萤石、方解石流体包裹体均一温度集中在137~170℃之间，盐度变化范围为11.46%~16.89%，属低温度、中低盐度NaCl-H₂O体系流体，主要来源可能为含沉积硫酸盐（海相沉积物）的岩石建造变质脱水；δ³⁴S值介于9.5‰~11.8‰之间，均值为10.92‰；²⁰⁶Pb/²⁰⁴Pb < 18.20，²⁰⁷Pb/²⁰⁴Pb>15.60，²⁰⁸Pb/²⁰⁴Pb < 39.00，铅同位素具有比值变化小，具有高μ和高ω的特征。硫源和铅源均主要来自于上地壳古生代沉积盆地奥陶纪和寒武纪容矿地层，同生沉积成岩后生中低温热液改造作用是革勒车地区铅锌-萤石矿床的主导成因类型。与鄂湘西扬子地台区典型铅锌矿床进行对比发现，它们具有较大的相似性，同时在成矿流体、古生代沉积环境、构造背景3个方面具有明显的差异性。
- 同位素 /
- 铅锌 /
- 萤石 /
- 物质来源 /
- 鄂西南 /
- 流体包裹体
Abstract: Objective
Lead-zinc mineralization is widely distributed in southwestern Hubei Province, but no large deposits have been found thus far, and there is a lack of systematic studies on metallogenic systems.
Methods
The C-H-O-S-Pb isotope analysis and the homogenization temperature of fluid inclusions of lead-zinc-fluorite ore in the Geleche area of Laifeng were conducted.
Results
The results show that the homogenization temperature of fluid inclusions in fluorite and calcite is concentrated between 137-170℃, and the variation range of salinity is 11.46%-16.89%. It is a NaCl-H₂O system with low temperature and medium and low salinity. The main source may be metamorphic dehydration of rock formations containing sedimentary sulfate (marine sediments). The δ³⁴S content ranges from 9.5‰ to 11.8‰, with an average of 10.92‰. ²⁰⁶Pb/²⁰⁴Pb < 18.20, ²⁰⁷Pb/²⁰⁴Pb>15.60, and ²⁰⁸Pb/²⁰⁴Pb < 39.00, and the floating ratio is small and high μ and high ω.
Conclusion
The sulfur and lead sources are mainly from the Ordovician and Cambrian ore-bearing strata in the Paleozoic sedimentary basin of the upper crust. Syngenetic sedimentary diagenesis and epigenetic medium- and low-temperature hydrothermal transformation are the dominant genetic types of the Geleche mining area. Compared with the typical lead-zinc deposits in the Yangtze Platform of West Hubei and Hunan, they have great similarity and obvious differences in metallogenic fluid, Paleozoic sedimentary environment and tectonic background.
- isotope /
- lead and zinc /
- fluorite /
- material source /
- southwestern Hubei /
- fluid inclusion
注释:

所有作者声明不存在利益冲突。

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图 1 鄂湘西矿产地质简图

a.大地构造位置图; b.鄂湘西地区地质简图; c.鄂湘西地区矿化分布图。Ⅰ.恩施铅锌-萤石成矿远景区；Ⅱ.洛塔铅锌矿成矿远景区；Ⅲ.保靖铅锌矿成矿远景区；Ⅳ.花垣铅锌矿成矿远景区。1.白垩系；2.二叠系-三叠系；3.奥陶系-志留系；4.寒武系；5.震旦系；6.铅锌矿床(点)；7.萤石矿床(点)；8.地层界线；9.断层；10.研究区位置

Figure 1. Geological sketch of mineral resources in western Hubei and Hunan

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图 2 湖北来凤革勒车矿区地质图

1.大湾组; 2.红花园组; 3.南津关组; 4.娄山关组; 5.地质界线; 6.断层; 7.岩层产状; 8.萤石矿脉; 9.铅锌矿脉; 10地名

Figure 2. Geological map of the Geleche mining area, Hubei

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图 3 革勒车矿区岩石薄片特征

a.白云岩团块鲕粒结构；b.白云岩含团块藻砂屑结构；c.含藻砂屑生物屑结构

Figure 3. Characteristics of rock slices in the Geleche mining area

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图 4 革勒车矿区矿石特征

a.方铅矿团块和方解石脉体伴生；b.闪锌矿晶体(×20)；c.萤石矿

Figure 4. Ore characteristics of the Geleche mining area

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图 5 革勒车矿区典型流体包裹体显微特征(V.气相; L.液相)

Figure 5. Microscopic characteristics of typical fluid inclusions in the Geleche mining area

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图 6 研究区成矿流体的δD-δ¹⁸O图

Figure 6. δD-δ¹⁸O diagram of ore-forming fluid in the study area

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图 7 研究区含矿方解石δ¹³C_V-PDB-δ¹⁸O_V-SMOW关系

Figure 7. δ¹³C_V-PDB-δ¹⁸O_V-SMOW diagram of ore bearing calcite in the study area

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图 8 革勒车矿区S同位素组成分布

Figure 8. Distribution of S isotopic composition in the Geleche mining area

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图 9 革勒车矿区铅同位素Δβ-Δγ特征图(底图据文献[30])

1.地幔源铅；2.上地壳铅；3.上地壳与地幔混合的俯冲带铅(3a岩浆作用，3b沉积作用)；4.化学沉积铅；5.海底热水作用铅；6.中深变质铅；7.深变质下地壳铅；8.造山带铅；9.古老页岩上地壳铅；10.退变质铅)

Figure 9. Δβ-Δγ diagram of lead isotopes in the Geleche mining area

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图 10 革勒车矿区铅同位素生长曲线图

A.地幔；B.造山带；C.上地壳；D.下地壳

Figure 10. Lead isotope growth curve of the Geleche mining area

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图 11 革勒车矿区铅同位素构造演化图(底图据文献[31])

LC.下地壳；UC.上地壳；OIV.洋岛火山岩；OR.造山带；A，B，C，D分别为各区域中样品相对集中区

Figure 11. Lead isotope structural evolution in the Geleche mining area

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表 1 革勒车矿区流体包裹体测温分析结果

Table 1. Microthermometric measurements on fluid inclusions from the Geleche mining area

矿物	形态	包裹体个数	大小/μm	气液比	均一温度/℃	盐度/%
方解石	椭圆形	30	3×4~4×7	2~6	133~179	13~16
	不规则	26	3×4~6×8	2~6	119~198	12~16
	长条形	15	1×4~3×8	3~6	117~174	12~14
萤石	椭圆形	24	3×3~8×4	2~5	113~170	11~16
	不规则	24	3×4~6×6	2~9	122~188	10~16
	长条形	12	2×6~2×8	4~9	134~166	12~15

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表 2 研究区和鄂湘西地区典型矿床碳氢氧同位素组成

Table 2. Carbon, hydrogen and oxygen isotope compositions of typical deposits in the study area and western Hubei and Hunan

远景区	矿区(床)	样品号	矿物	δ¹³C_V-PDB/‰	δD_V-SMOW/‰	δ¹⁸O_V-SMOW/‰	资料来源
恩施远景区	革勒车	GLCFJ01	方解石	-1.4	-43.8	17.7	本研究
保靖远景区	起车	—	石英	—	-73.0	17.9	文献[4]
	起车	KMD1C	方解石	-1.1	—	19.0
	起车	KMD1C	方解石	-1.5	—	12.3
花垣远景区	李梅	LM-1	方解石	—	-23.0	0.25	文献[5]
	李梅	LM-2	方解石	—	-40.0	1.54
	李梅	LM-4	方解石	—	-46.0	2.43
	李梅	LM-5	方解石	—	-33.0	1.72
	耐子堡	H1-2	方解石	-0.99	—	18.03	文献[6]
	耐子堡	H2-3	方解石	-0.97	—	21.30
	耐子堡	H5-7	方解石	-0.73	—	21.10
凤凰远景区	茶田	CH-1	石英	—	-76.0	0.57	文献[5]
	茶田	CH-2	石英	—	-75.0	0.74	文献[5]
	和平镇	TZC6	方解石	-3.51	—	14.83	文献[6]
	和平镇	TZC6	方解石	-3.47	—	14.93	文献[6]

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表 3 研究区和鄂湘西地区典型矿床δ³⁴S同位素特征

Table 3. Sulfur isotope compositions of galena from the studied deposits and published data from typical deposits from western Hubei and Hunan

远景区	矿床(区)	样品号	矿物	δ³⁴S_V-CDT/‰	数据来源
恩施远景区	革勒车	FQ01	方铅矿	11.2	本研究
	革勒车	FQ02	方铅矿	11.8
	革勒车	FQ03	方铅矿	9.5
	革勒车	FQ04	方铅矿	11.5
	革勒车	FQ05	方铅矿	10.6
	埃山	—	方铅矿	16.6	文献[14]
	埃山	—	方铅矿	15.3	文献[14]
洛塔远景区	江家垭	—	方铅矿	12.53	文献[15]
	唐家寨	TCH-05	方铅矿	15.08	文献[16]
	卡西湖	—	方铅矿	11.12	文献[17]
保靖远景区	起车	TZG	方铅矿	15.1	文献[4]
保靖远景区	起车	JXDG	方铅矿	15.8	文献[4]
花垣远景区	李梅	PMP2-15	方铅矿	26.6	文献[2]
花垣远景区	狮子山	SZS-01	方铅矿	26.8	文献[18]
凤凰远景区	耐子堡	H6-9	方铅矿	26.59	文献[17]
凤凰远景区	耐子堡	H8-12	方铅矿	23.96	文献[17]

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表 4 鄂湘西地区典型铅锌矿床铅同位素组成

Table 4. Lead isotopic ratios of sulfides from the studied deposits and published data from typical deposits from western Hubei and Hunan

成矿远景区	矿床(区)	样号	矿物	²⁰⁶Pb/²⁰⁴Pb	²⁰⁷Pb/²⁰⁴Pb	²⁰⁸Pb/²⁰⁴Pb	μ	ω	Δβ	Δγ	数据来源
恩施远景区	革勒车	FQ01	方铅矿	18.10	15.78	38.43	9.85	39.95	29.50	32.60	本研究
	革勒车	FQ02	方铅矿	18.03	15.68	38.13	9.68	38.18	23.50	24.57
	革勒车	FQ03	方铅矿	18.06	15.71	38.24	9.73	38.73	25.45	27.42
	革勒车	FQ04	方铅矿	18.13	15.80	38.50	9.89	40.29	30.87	34.43
	革勒车	FQ05	方铅矿	18.07	15.72	38.27	9.75	38.91	26.04	28.14
	埃山	—	方铅矿	19.12	15.86	39.37	—	—	27.80	46.32	文献[14]
	埃山	—	方铅矿	19.15	15.88	39.46	—	—	29.23	48.58	文献[14]
洛塔远景区	江家垭	—	方铅矿	18.24	15.69	38.14	9.67	37.07	25.18	35.28	文献[19]
	江家垭	—	方铅矿	18.30	15.76	38.36	9.79	38.31	29.72	42.82
	江家垭	—	方铅矿	18.24	15.72	38.33	9.71	38.10	26.93	41.59
保靖远景区	起车	TZG	方铅矿	18.21	15.67	38.15	9.63	37.11	24.00	35.51	文献[4]
保靖远景区	起车	JXDG	方铅矿	18.24	15.71	38.28	9.70	37.85	26.56	40.04	文献[4]
花垣远景区	李梅	PMP2-15	方铅矿	18.17	15.72	38.34	—	—	—	—	文献[2]
花垣远景区	李梅	—	闪锌矿	18.04	15.61	38.18	9.52	37.62	19.70	36.91	文献[19]
凤凰远景区	狮子山	SZS-01	方铅矿	18.11	15.67	38.18	9.63	—	23.91	39.08	文献[18]
凤凰远景区	耐子堡	H6-9	方铅矿	18.15	15.72	38.22	9.73	38.20	27.57	41.75	文献[17]

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