白秧坪铅锌多金属矿集区东矿带成矿地球化学作用与成矿年龄

王晓虎; 宋玉财; 张洪瑞; 刘英超; 潘小菲; 郭涛

白秧坪铅锌多金属矿集区东矿带成矿地球化学作用与成矿年龄

1.
中国地质科学院地质力学研究所, 北京 100081
2.
中国地质科学院地质研究所, 北京 100037

基金项目:

国家自然科学基金项目 41302067

国家自然科学基金项目 41472067

国家自然科学基金项目 41403043

中国地质科学院中央级公益性科研院所基本科研业务费项目 YYWF201614

详细信息

作者简介:
王晓虎(1983-), 男, 助理研究员, 博士, 主要从事矿床学与矿田构造等研究工作。E-mail:wangzykc@yeah.net

中图分类号: P618.4
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出版历程
- 收稿日期: 2015-11-16
- 刊出日期: 2016-06-01

GEOCHEMICAL CHARACTERISTICS AND METALLOGENIC AGE OF THE EAST ORE BELT IN BAIYANGPING POLYMETALLIC ORE CONCENTRATION AREA

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

摘要

摘要: 通过成矿期方解石的C、O、Sr和含硫矿物的S、Pb同位素，成矿期方解石Sm-Nd测年研究，探讨白秧坪矿集区东矿带矿床成因。测试结果表明，白秧坪矿集区东矿带方解石δ¹³C_PDB值变化范围-4.0‰~2.3‰，平均值-0.2‰，δ¹⁸O_PDB值范围-27.2‰~20.4‰，平均值-14.1‰，δ¹⁸O_SMOW值范围2.9‰~24.4‰，平均值16.4‰；方解石Sr同位素值变化范围0.707669~0.710115，平均值0.709320；硫化物δ³⁴S_V-CDT值分布范围-20.2‰~1.3‰，平均值约-8.8‰，天青石δ³⁴S_V-CDT值分布范围为17.1‰~19.4‰，平均值约18.0‰；Pb同位素测试结果中，²⁰⁶Pb/²⁰⁴Pb的变化范围为18.553~18.857，²⁰⁷Pb/²⁰⁴Pb变化范围为15.501~15.826，²⁰⁸Pb/²⁰⁴Pb变化范围为38.54~39.456；成矿阶段方解石Sm-Nd等时线年龄为29.5±1.7 Ma。对测试结果的研究表明，白秧坪矿集区东矿带碳质的来源较为均一，矿石中热液方解石碳质源自地层中碳酸盐岩溶解，成矿流体来自地层水和大气降水，属于盆地卤水流体系统；成矿物质硫来自海水硫酸盐的还原作用，成矿早期以有机质还原硫为主，成矿后期以生物还原硫为主；金属成矿物质来自沉积地层和盆地基底；测定白秧坪矿集区东矿带铅锌成矿年龄为29.5±1.7 Ma，与地质年龄限定的较为吻合。
- 兰坪盆地 /
- 白秧坪矿集区 /
- 东矿带 /
- 铅锌 /
- 地球化学 /
- 成矿年龄
Abstract: By studying the C, O and Sr isotopic characteristics of calcites in ore-forming stage, the S and Pb isotopic characteristics of sulfides, and the Sm-Nd dating of calcite in mineralization period, we discussed the ore genesis of the east belt in Baiyangping ore concentration area. Test results show that the δ¹³C_PDB values of calcite range from -4.0‰ to -2.3‰ with the average of -0.2‰, the δ¹⁸O_PDB values range from -27.2‰ to 20.4 ‰ with the average of -14.1‰, the δ¹⁸O_SMOW values range from 2.9‰ to 24.4‰ with the average of 16.4‰, and the Sr isotopic values of calcite are between 0.707669 and 0.710115 with the average of 0.709320. The δ³⁴S_V-CDT values of sulfides distribute in the range of -20.2 ‰ to 1.3 ‰ with the average of about -8.8‰, and the δ³⁴S_V-CDT values of celestine distribute in the range of 17.1‰ to 19.4‰ with the average of about 18.0‰. The Pb isotope test results yield ²⁰⁶Pb/²⁰⁴Pb values of 18.553~18.857, ²⁰⁷Pb/²⁰⁴Pb values of 15.501~15.826 and ²⁰⁸Pb/²⁰⁴Pb values of 38.54~39.456, and the Sm-Nd isochron age of calcite in mineralization stage is 29.5±1.7 Ma. The results indicate a homogeneous carbon source in the east ore belt, and the carbon in hydrothermal calcite is derived from the dissolution of carbonate rock strata. The ore-forming fluids are from formation water and precipitate water, which are belonged to the basin brine fluid system. The sulfur is from organic thermal chemical sulfate reduction in the early mineralization stage and biological sulfate reduction in the late mineralization stage. And the metal mineralization material is from sedimentary strata and basement. The dating results show that the Pb-Zn mineralization of the east ore belt occurred at 29.5±1.7 Ma ago, which is consistent with the constrainted geological age.
- Lanping basin /
- Baiyangping ore concentration area /
- the east ore belt /
- lead-zinc /
- geochemical feature /
- metallogenic age

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图 1 白秧坪矿集区东矿带地质简图(据文献^[9]修编)

Figure 1. The geological sketch map of the east ore belt of Baiyangping ore concentration area

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图 2 白秧坪矿集区东矿带成矿阶段方解石Sm-Nd等时线图

Figure 2. The Sm-Nd isochron diagram of the calcite in mineralization stage in the east ore belt of Baiyangping metallogenic concentration area

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图 3 白秧坪多金属矿集区东矿带方解石及成矿流体氧同位素组成分布图(底图据文献^[28])

Figure 3. δ¹⁸O values of calcite and ore-forming fluid in the east ore belt of Baiyangping polymetallic ore district

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图 4 白秧坪方解石碳同位素组成分布图(底图据文献[32])

Figure 4. δ¹³C values of calcite in Baiyangping Pb-Zn-Cu-Ag polymetallic deposit

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图 5 白秧坪铅锌铜银多金属矿床方解石的C、O同位素图(底图据文献[33])

Figure 5. Diagram of C-O isotope of calcite in Baiyangping Pb-Zn-Cu-Ag polymetallic deposit

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图 6 白秧坪多金属矿集区东矿带硫同位素组成

Figure 6. S isotopic composition of the east ore belt in Baiyangping polymetallic ore district

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图 7 锶同位素演化图(底图据文献[43])

Figure 7. Evolution diagram of strontium isotope

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图 8 白秧坪矿集区东矿带铅同位素Δβ-Δγ成因分类图解(底图据文献[44])

Δβ=1000×β/(β_M-1)，Δγ=1000×γ/(γ_M-1)，β、γ和β_M、γ_M分别为样品和地幔的²⁰⁷Pb/²⁰⁴Pb和²⁰⁸Pb/²⁰⁴Pb

Figure 8. Δβ-Δγ genetic classification diagram of lead isotope of the east ore belt in Baiyangping Pb-Zn-Cu-Ag polymetallic deposits

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图 9 白秧坪东矿带Pb同位素数据与基底和邻区地层全岩的Pb同位素数据对比

Figure 9. Comparison of Pb isotope composition of sulfides from the east belt of Baiyangping ore concentration area and whole-rock Pb isotope composition of strata from basement and adjacent area

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表 1 白秧坪矿集区东矿带方解石C、O、Sr同位素测试结果

Table 1. The C-O-Sr isotope results of calcites from the east ore belt of Baiyangping ore concentration area

序号	样品号	矿段	矿物	δ¹³C_PDB/‰	δ¹⁸O_PDB/‰	δ¹⁸O_SMOW	成矿流体δ¹⁸O_SMOW	⁸⁷Sr/⁸⁶Sr	SE
1	HS016-7	灰山	方解石	1.7	-9.0	21.6	9.2	0.709508	6
2	HS016-8	灰山	方解石	2.3	-10.3	20.3	7.9	0.708280	5
3	HS016-10	灰山	方解石	0.7	-6.3	24.4	12.0	0.709477	4
4	HS016-12	灰山	方解石	1.2	-9.4	21.2	8.8	0.709482	5
5	HS2-7	灰山	方解石	-3.0	-15.0	15.5	3.1	0.709475	5
6	HS2-10	灰山	方解石	-1.3	-23.5	6.7	-5.7	0.709633	5
7	D019-4	黑山	方解石	-4.0	-11.7	18.8	6.4	0.709331	4
8	D019-9	黑山	方解石	0.7	-27.2	2.9	-9.5	0.709093	4
9	HX024-1	河西	天青石					0.710115	3
10	HX024-2	河西	天青石					0.709926	5
11	HX024-3	河西	天青石					0.709896	6
12	HX024-4	河西	天青石					0.707669	7
13	HX024-5	河西	天青石					0.709971	5
14	HX030-4	河西	天青石					0.709981	4
15	HX2-11	河西	天青石					0.709899	3
16	HX2-12	河西	天青石					0.709977	5
17	HX2-14	河西	天青石					0.709746	4
18	YZD040-5	燕子洞	天青石					0.708749	5
19	YZD040-6	燕子洞	天青石					0.708660	4
20	YZD040-10	燕子洞	天青石					0.708675	5
21	YZD2-1	燕子洞	天青石					0.708173	6

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表 2 兰坪盆地白秧坪矿集区东矿带硫化物、硫盐矿物中S、Pb同位素组成

Table 2. S-Pb isotope composition of sulfide and sulphosalts from the east ore belt of Baiyangping ore concentration area

序号	样品号	矿物	矿床/矿段	δ³⁴S_V-CDT/‰	²⁰⁶Pb/²⁰⁴Pb	²⁰⁷Pb/²⁰⁴Pb	²⁰⁸Pb/²⁰⁴Pb	Δβ	Δγ	样品描述
1	HX024-2	方铅矿	河西	-11.2	18.605	15.623	38.812	19.1	36.1	含方铅矿天青石矿石
2	HX030-1	方铅矿	河西	-20.2	18.598	15.601	38.76	17.6	34.7	块状方铅矿
3	HX030-1	方铅矿	河西	-11.0	18.609	15.619	38.809	18.8	36.1	块状方铅矿
4	HX030-10	方铅矿	河西	-19.1	18.584	15.590	38.706	16.8	33.3	明显的方铅矿胶结灰岩角砾
5	HX2-14	方铅矿	河西	-10.6	18.588	15.594	38.707	17.1	33.3	与天青石共生的团块状方铅矿
6	YZD2-1	闪锌矿	燕子洞	-9.5	18.600	15.572	38.727	15.5	33.9	闪锌矿矿石
7	YZD2-2	闪锌矿	燕子洞	-9.2	18.688	15.642	38.918	20.2	39.0	闪锌矿矿石
8	YZD040-2	闪锌矿	燕子洞	-10.5	18.614	15.591	38.753	16.8	34.6	泥灰岩中的闪锌矿
9	YZD040-3	闪锌矿	燕子洞	-10.6	18.661	15.597	38.752	17.1	34.5	灰岩中的闪锌矿
10	YZD040-6	闪锌矿	燕子洞	-10.8	18.553	15.501	38.54	10.7	28.9	含天青石、闪锌矿矿石
11	YZD040-10	闪锌矿	燕子洞	-13.0	18.681	15.642	38.937	20.2	39.5	天青石、闪锌矿脉
12	HS2-4	闪锌矿	灰山	-6.7	18.742	15.696	39.018	23.8	41.6	不含矿方解石脉穿切含团块状闪锌矿的方解石脉
13	HS2-5	闪锌矿	灰山	-7.7	18.684	15.633	38.822	19.6	36.4	无矿方解石脉切穿闪锌矿-方解石细脉
14	HS2-7	闪锌矿	灰山	-6.2	18.703	15.642	38.822	20.1	36.4	同期形成的呈互层出现的闪锌矿脉和石英脉
15	HS2-8	闪锌矿	灰山	-6.4	18.685	15.631	38.844	19.4	37.0	方解石-闪锌矿脉
16	HS2-9	闪锌矿	灰山	-6.4	18.725	15.647	38.813	20.4	36.2	方解石-闪锌矿脉被晚期无矿方解石脉切穿
17	HS2-10	闪锌矿	灰山	-7.1	18.656	15.616	38.806	18.4	36.0	含少量浸染状闪锌矿的方解石网脉
18	D019-4	黝铜矿	黑山	1.3	18.825	15.788	39.331	30.0	50.0	热液胶结角砾状矿石
19	D019-8	黝铜矿	黑山	-2.7	18.857	15.82	39.129	32.2	44.6	铅锌矿石
20	D019-8	闪锌矿	黑山	-2.9	18.716	15.621	38.800	18.6	35.8	铅锌矿石
21	D019-9	黝铜矿	黑山	-4.1	18.856	15.826	39.456	32.6	53.4	含方解石脉铅锌矿石
22	HX024-1	天青石	河西	17.2
23	HX024-2	天青石	河西	17.8
24	HX024-3	天青石	河西	17.2
25	HX024-4	天青石	河西	18.3
26	HX024-5	天青石	河西	17.1
27	HX030-4	天青石	河西	17.9
28	HX02-11	天青石	河西	17.1
29	HX2-12	天青石	河西	17.3
30	HX2-14	天青石	河西	18.1
31	YZD040-5	天青石	燕子洞	18.7
32	YZD040-6	天青石	燕子洞	18.6
33	YZD040-10	天青石	燕子洞	18.7
34	YZD2-1	天青石	燕子洞	19.4

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表 3 白秧坪矿集区东矿带成矿阶段方解石Sm-Nd分析检测结果

Table 3. Sm-Nd analysis results of the calcite in mineralization stage in the east ore belt of Baiyangping metallogenic concentration area

序号	样品号	Sm/10^-6	Nd/10^-6	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd(1σ误差)
1	HS016-7	3.298	1.004	0.1682	0.512432±6
2	HS016-8	1.645	0.2753	0.1016	0.512417±8
3	HS016-10	2.597	0.6892	0.1624	0.512431±9
4	HS016-12	2.516	0.5894	0.146	0.512426±7
5	HS2-7	1.207	0.3706	0.1827	0.512435±8
6	D019-4	0.1986	0.1513	0.4238	0.512480±9
7	D019-9	0.3314	0.0982	0.1893	0.512436±6
	美国La Jolla Nd同位素标准				0.511864±3 (国际权威值：0.511860±20)

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