印度尼西亚戴里Sedex型铅锌矿集区成矿流体特征及成矿物质来源:流体包裹体及同位素地球化学证据

张海坤; 胡鹏; 曹亮; 程湘; 战明国; 潘罗忠; 戴昱; 潘贝红

doi:10.19509/j.cnki.dzkq.2020.0318

印度尼西亚戴里Sedex型铅锌矿集区成矿流体特征及成矿物质来源:流体包裹体及同位素地球化学证据

doi: 10.19509/j.cnki.dzkq.2020.0318

基金项目:

中国地质调查局地质调查项目"印度尼西亚苏门答腊岛铜多金属资源潜力评价" DD20160114

广西壮族自治区地质矿产勘查开发局地质勘查基金项目"广西与东盟特提斯构造过程与大规模成矿作用对比研究" 桂地矿外任[2018]1号

详细信息

作者简介:
张海坤(1987-), 男, 助理研究员, 主要从事境外地质调查研究工作。E-mail:328543434@qq.com

中图分类号: P618.4
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出版历程
- 收稿日期: 2019-01-27

Characteristics of mineralization fluids and mineralization material sources of the Sedex-type Dairi Pb-Zn ore concentration area in Indonesia: Evidence from fluid inclusions and isotopic geochemistry

摘要

摘要: 戴里铅锌矿集区位于印度尼西亚苏门答腊岛西北部，是一个主要产于页岩、具有巨型规模的Sedex型铅锌矿。通过系统的流体包裹体测试及H、O、S、Pb等同位素分析，以对其成因进行约束。分析结果表明：①戴里铅锌矿流体包裹体均一温度范围为189~315℃，峰值为220~240℃；②δD_V-SMOW值范围为-68.7‰~-76.4‰，平均为-72.9‰，δ¹⁸O_V-SMOW值范围为+5.9‰~+19.5‰，平均为+16.6‰；③黄铁矿δ³⁴S_CDT值为正值，集中分布在+25.49‰~+26.36‰之间；④铅同位素显示较高的μ值（9.92~10.17，平均值为10.04）和ω值（38.06~40.51，平均值为39.26）。该矿床成矿流体温度为中温（220~240℃），成矿流体可能以岩浆水为主，有少量浅源水的加入，硫、铅均为单一来源，其中硫主要来自海水，铅来源于上地壳。
- 印度尼西亚 /
- 戴里铅锌矿集区 /
- Sedex型 /
- 流体包裹体 /
- 硫铅同位素
Abstract: The Dairi Pb-Zn ore concentration area, hosted by shale and displaying Sedex-type Pb-Zn mineralization of giant scale, is located in northwestern Sumatra, Indonesia.Systematic analysis of fluid inclusions and H, O, S and Pb isotopes was performed to probe its genesis.The results show that (1) the homogenization temperatures range from 189 to 315℃, with a peak at 220-240℃, indicating medium temperature for mineralization; (2)values of δ¹⁸O_V-SMOW vary from +5.9‰ to +19.5‰, with an average of +16.6‰, implying a magma water-dominated mineralization fluid with minor addition of shallow water; (3)pyrites have positive δ³⁴S_CDT values from +25.49‰ to +26.36‰; (4)lead isotopes possess high μ values of 9.92-10.17(averaging 10.04) and ω values of 38.06-40.51 (averaging 39.26).It is indicated that the ores from Dairi formed at medium temperatures, having a fluid source dominated by magma water with minor addition of shallow water, a sulfur source comparable to ocean water and a single lead source from the crust.
- Indonesia /
- Dairi Pb-Zn ore concentration area /
- Sedex type /
- fluid inclusion /
- sulfur and lead isotopic geochemistry

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图 1 苏门答腊岛大地构造背景(据文献[5]修改)

Figure 1. Tectonic setting of Sumatra

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图 2 苏门答腊岛地质简图(据文献[6]修改)

Figure 2. Simplified geological map of Sumatra

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图 3 戴里铅锌矿集区地质简图(据文献[1]修改)

Figure 3. Geological sketch of Dairi Pb-Zn ore concentration area in Sumatra, Indonesia

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图 4 印度尼西亚苏门答腊岛戴里铅锌矿集区安靖潭矿床1-1′剖面图(据文献[1]修改)

Figure 4. Cross section along 1-1′ in Anjing Hitam deposit, Dairi Pb-Zn ore concentration area, Sumatra, Indonesia

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图 5 戴里铅锌矿集区矿体露头和矿石镜下特征

a.矿体露头照片；b.样品DL-1手标本; c.样品DL-1光片照片；d.样品DL-2手标本; e.样品DL-2光片照片；Py.黄铁矿；Gn.方铅矿；Sp.闪锌矿

Figure 5. Photos showing orebody outcrop and ores from Dairi Pb-Zn ore concentration area

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图 6 气液两相流体包裹体显微照片(V_H₂O.气相；L_H₂O.液相)

Figure 6. Micrographs of the gas-liquid two-phase inclusions

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图 7 戴里铅锌矿集区矿体流体包裹体均一温度直方图

Figure 7. Hisograms showing homogenization temperature of fluid inclusions of ores from Dairi Pb-Zn ore concentration area

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图 8 戴里铅锌矿集区石英流体包裹体氢氧同位素组成图解

Figure 8. Hydrogen isotopic composition of quartz fluid inclusion of ores from Dairi Pb-Zn ore concentration area

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图 9 戴里铅锌矿同位素模式图(a)和矿石铅Δγ-Δβ成因判别图解(b)(底图自文献[25]修改)

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

Figure 9. Lead isotopic composition model (a) and Δγ-Δβ genetic discriminate diagram of galena (b) of ores from Dairi ore concentration area

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表 1 戴里铅锌矿集区矿体流体包裹体气相成分(μL/g)

Table 1. Gas composition of fluid inclusions of ores from Dairi Pb-Zn ore concentration area

样号	矿物名称	H₂	N₂	CO	CH₄	CO₂	H₂O(气相)
DL-B12	石英	2.19	23.4	2.55	1.56	11.8	2.48×10⁵
DL-B13	石英	2.82	62.3	1.61	0.977	11.9	1.65×10⁵
DL-B15	石英	1.48	52.3	0.647	1.64	28.9	7.29×10⁵
注：测试单位为核工业北京地质研究院分析测试研究中心

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表 2 戴里铅锌矿流体包裹体液相成分及相关参数

Table 2. Liquid composition and related parameters of fluid inclusions in Dairi Pb-Zn ore

样号	矿物名称	F^-	Cl^-	NO₃^-	SO₄^2-	Na⁺	K⁺	Mg²⁺	Ca²⁺	Na⁺/K⁺	Na⁺/(Ca²⁺+Mg²⁺)	Cl^-/F^-
样号	矿物名称	w_B/(μg·g^-1)								Na⁺/K⁺	Na⁺/(Ca²⁺+Mg²⁺)	Cl^-/F^-
DL-B12	石英	0.330	10.2	0.992	4.97	6.83	2.02	0.837	3.84	3.38	1.46	30.91
DL-B13	石英	0.195	8.06	1.32	23.60	0.798	1.97	1.20	10.00	0.41	0.07	41.33
DL-B15	石英	0.174	11.2	0.805	8.86	4.31	1.62	0.809	13.10	2.66	0.31	64.37
注：测试单位为核工业北京地质研究院分析测试研究中心

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表 3 戴里铅锌矿集区矿体包裹体显微测温结果

Table 3. Microthermometry measurements of fluid inclusions of ores from Dairi Pb-Zn ore concentration area

序号	编号	类型	大小(长径)/μm	气液比/%	均一相态	T_h/℃	包裹体数量/个
1	DL-B12	富液包裹体	4~10	5~10	液相	215~275	21
2	DL-B13	富液包裹体	2~14	10~30	液相	221~289	16
3	DL-B14	富液包裹体	4~18	5~10	液相	230~302	25
4	DL-B15	富液包裹体	6~10	5~10	液相	189~310	22
5	DL-B16	富液包裹体	3~16	10~15	液相	203~298	18
6	DL-B17	富液包裹体	4~10	10~20	液相	211~315	27

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表 4 戴里铅锌矿集区石英流体包裹体氢氧同位素组成

Table 4. Hydrogen isotopic composition of quartz fluid inclusions of ores from Dairi Pb-Zn ore concentration area

序号	样品编号	测定矿物	δD_V-SMOW/‰	δ¹⁸O_V-SMOW/‰	δ¹⁸O_H₂O/‰
1	DL-B12	石英	-73.7	19.0	9.0
2	DL-B13	石英	-72.4	18.1	8.1
3	DL-B14	石英	-76.4	19.5	9.5
4	DL-B15	石英	-72.1	17.9	7.9
5	DL-B16	石英	-74.0	19.4	9.4
6	DL-B17	石英	-68.7	5.9	-4.1

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表 5 戴里铅锌矿硫同位素组成

Table 5. Sulfur isotope composition of pyrite from ores in Dairi Pb-Zn ore concentration area

序号	样品编号	样品描述	矿物	δ³⁴S_CDT/‰
1	17DL7B3	矿石	黄铁矿	25.49
2	17DL-B4	矿石	黄铁矿	25.67
3	17DL-B5	矿石	黄铁矿	26.06
4	17DL-B6	矿石	黄铁矿	26.02
5	17DL-B7	矿石	黄铁矿	26.18
6	17DL-B8	矿石	黄铁矿	26.28
7	17DL-B9	矿石	黄铁矿	26.36
8	17DL-B10	矿石	黄铁矿	26.20

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表 6 戴里铅锌矿矿石中黄铁矿铅同位素组成

Table 6. Lead isotopic composition of pyrite from ores in Dairi ore concentration area

序号	样品号	矿物	²⁰⁶Pb/²⁰⁴Pb	²⁰⁷Pb/²⁰⁴Pb	²⁰⁸Pb/²⁰⁴Pb	t_CDT/Ma	μ	ω	Th/U	Δα	Δβ	Δγ
1	DL-B3	黄铁矿	19.090	15.930	39.253	89.0	10.04	39.22	3.78	106.89	39.24	51.47
2	DL-B4	黄铁矿	19.065	15.893	39.132	61.0	9.97	38.52	3.74	103.24	36.71	47.00
3	DL-B5	黄铁矿	19.103	15.952	39.331	106.0	10.08	39.67	3.81	108.98	40.75	54.31
4	DL-B6	黄铁矿	19.044	15.867	39.048	44.0	9.92	38.06	3.71	100.71	34.95	44.01
5	DL-B7	黄铁矿	19.076	15.908	39.182	72.0	10.00	38.80	3.76	104.74	37.74	48.82
6	DL-B8	黄铁矿	19.109	15.960	39.369	111.0	10.10	39.86	3.82	109.73	41.29	55.55
7	DL-B9	黄铁矿	19.108	15.943	39.294	92.0	10.06	39.41	3.79	108.17	40.10	52.70
8	DL-B10	黄铁矿	19.147	15.999	39.489	132.0	10.17	40.51	3.86	113.61	43.92	59.70
注：t_CDT代表原始铅年龄，μ=²³⁸U/²⁰⁴Pb, ω=²³²Th/²⁰⁴Pb, Δα、Δβ、Δγ分别为铅同位素比值²⁰⁶Pb/²⁰⁴Pb、²⁰⁷Pb/²⁰⁴Pb、²⁰⁸Pb/²⁰⁴Pb与同时代地球原始铅同位素相对千分偏差值

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