Sulfur and Lead Isotopic Compositions of the Pusangguo Cu-Pb-Zn Polymetallic Deposit in Tibet: Implications for the Source of Ore-forming Material

doi:10.19657/j.geoscience.1000-8527.2018.01.05

Abstract

Abstract:

The Pusangguo Cu-Pb-Zn polymetallic deposit is located in the southern Gangdese volcanic magma arc, Tibet. The east to west trending skarn orebodies are bedded or lenticular, which mainly occurred in the skarnized marble of Cretaceous Takena Formation. On the basis of previous data and geological investigation, this study systematically analyses the characteristics of sulfur and lead isotopic compositions of sulfides including sphalerite, galena, chalcopyrite, and pyrite to discuss the source of ore-forming materials.The results show that the δ³⁴S values of sulfides range from -2.4‰ to 1.0‰, averaging -0.40‰,with the tower distribution features, indicating that the sources of sulfur have magma-derived sulfur features and is related to the dioritic porphyrite. ²⁰⁶Pb/²⁰⁴Pb ratios of sulfides vary from 18.344 to 18.625, averaging 18.555; ²⁰⁷Pb/²⁰⁴Pb ratios range from 15.549 to 15.794, averaging 15.716; ²⁰⁸Pb/²⁰⁴Pb ratios are between 38.12 and 39.34,averaging 39.044. The lead isotopic compositions are stable and belong to the normal lead. Combining the μ values with the tectonic evolution diagram of lead isotope, it can be concluded that the lead is primarily sourced from the upper crust with minor involvement of mantle-derived materials.

Key words: sulfur isotope, lead isotope, source of ore-forming material, Pusangguo, Tibet

CLC Number:

P618.4
P597

LI Zhuang, WANG Liqiang, LI Haifeng, DANZHEN Wangxiu, SHI Shuo. Sulfur and Lead Isotopic Compositions of the Pusangguo Cu-Pb-Zn Polymetallic Deposit in Tibet: Implications for the Source of Ore-forming Material[J]. Geoscience, 2018, 32(01): 56-65.

Figures/Tables 9

References 67

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样品编号	测试对象	δ³⁴S_V-CDT/‰	数据来源	样品编号	测试对象	δ³⁴S_V-CDT/‰	数据来源
ZK504-102.72	黄铜矿	0.3	本文	PH027	黄铁矿	1	文献[14]
ZK504-127	黄铜矿	0		PH027	黄铜矿	0.1
ZK504-171	闪锌矿	0.8		PH029	黄铜矿	0.1
ZK005-202.8	方铅矿	-2.4		PH029	方铅矿	-1.8
ZK004-18.8	方铅矿	-1.5		PH032	黄铜矿	-0.2
PH003	黄铁矿	0.6	文献[14]	PH032	方铅矿	-1.3
PH025	闪锌矿	0.1		闪锌矿		-0.9
PH026	黄铁矿	0.1		PH034	黄铜矿	0.7
	黄铜矿	-0.2	方铅矿			-0.9
	方铅矿	-2.1	PH040		闪锌矿	0.3
	闪锌矿	-0.9	PH042		黄铜矿	-0.6

样品编号	测试对象	δ³⁴S_V-CDT/‰	数据来源	样品编号	测试对象	δ³⁴S_V-CDT/‰	数据来源
ZK504-102.72	黄铜矿	0.3	本文	PH027	黄铁矿	1	文献[14]
ZK504-127	黄铜矿	0		PH027	黄铜矿	0.1
ZK504-171	闪锌矿	0.8		PH029	黄铜矿	0.1
ZK005-202.8	方铅矿	-2.4		PH029	方铅矿	-1.8
ZK004-18.8	方铅矿	-1.5		PH032	黄铜矿	-0.2
PH003	黄铁矿	0.6	文献[14]	PH032	方铅矿	-1.3
PH025	闪锌矿	0.1		闪锌矿		-0.9
PH026	黄铁矿	0.1		PH034	黄铜矿	0.7
	黄铜矿	-0.2	方铅矿			-0.9
	方铅矿	-2.1	PH040		闪锌矿	0.3
	闪锌矿	-0.9	PH042		黄铜矿	-0.6

样品编号	测试对象	²⁰⁶Pb/²⁰⁴Pb(2σ)	²⁰⁷Pb/²⁰⁴Pb(2σ)	²⁰⁸Pb/²⁰⁴Pb(2σ)	μ	ω	Δβ	Δγ	数据来源
ZK504-102.72	黄铜矿	18.407±0.002	15.612±0.002	38.334±0.004	9.49	36.22	18.9	30.97	本文
ZK504-127.00	黄铜矿	18.344±0.002	15.549±0.002	38.120±0.005	9.37	35.11	14.64	23.79
ZK504-171.00	闪锌矿	18.593±0.002	15.755±0.002	39.211±0.005	9.75	40.15	28.42	56.44
ZK005-202.80	方铅矿	18.612±0.002	15.776±0.002	39.276±0.006	9.79	40.52	29.85	58.73
ZK004-18.80	方铅矿	18.625±0.002	15.794±0.002	39.340±0.005	9.82	40.88	31.08	60.99
PH003	黄铁矿	18.555±0.003	15.702±0.003	39.036±0.007	9.65	39.13	24.79	50.07	文献[14]
PH025	闪锌矿	18.545±0.002	15.694±0.002	39.011±0.005	9.63	39.00	24.26	49.27
PH026	黄铁矿	18.557±0.002	15.705±0.002	39.045±0.005	9.65	39.18	25.00	50.4
	黄铜矿	18.567±0.002	15.717±0.001	39.085±0.004	9.68	39.41	25.81	51.79
	方铅矿	18.546±0.003	15.692±0.003	39.005±0.007	9.63	38.95	24.11	48.97
	闪锌矿	18.558±0.002	15.705±0.002	39.042±0.005	9.65	39.16	24.99	50.28
PH027	黄铁矿	18.547±0.001	15.697±0.001	39.020±0.003	9.64	39.06	24.46	49.60
PH027	黄铜矿	18.582±0.002	15.742±0.001	39.170±0.004	9.72	39.92	27.54	54.97
PH029	黄铜矿	18.586±0.003	15.746±0.003	39.182±0.008	9.73	39.98	27.81	55.38
PH029	方铅矿	18.542±0.002	15.692±0.001	39.004±0.004	9.63	38.97	24.13	49.08
PH032	黄铜矿	18.585±0.002	15.742±0.002	39.167±0.006	9.72	39.89	27.53	54.80
	方铅矿	18.580±0.002	15.744±0.002	39.171±0.004	9.73	39.95	27.69	55.18
	闪锌矿	18.549±0.002	15.702±0.002	39.040±0.004	9.65	39.18	24.81	50.36
PH034	黄铜矿	18.590±0.002	15.758±0.002	39.221±0.005	9.76	40.24	28.65	56.97
PH034	方铅矿	18.594±0.002	15.758±0.003	39.215±0.007	9.75	40.19	28.63	56.68
PH040	闪锌矿	18.568±0.002	15.721±0.002	39.098±0.004	9.68	39.49	26.09	52.32
PH042	黄铜矿	18.585±0.003	15.741±0.003	39.168±0.007	9.72	39.88	27.46	54.78

样品编号	测试对象	²⁰⁶Pb/²⁰⁴Pb(2σ)	²⁰⁷Pb/²⁰⁴Pb(2σ)	²⁰⁸Pb/²⁰⁴Pb(2σ)	μ	ω	Δβ	Δγ	数据来源
ZK504-102.72	黄铜矿	18.407±0.002	15.612±0.002	38.334±0.004	9.49	36.22	18.9	30.97	本文
ZK504-127.00	黄铜矿	18.344±0.002	15.549±0.002	38.120±0.005	9.37	35.11	14.64	23.79
ZK504-171.00	闪锌矿	18.593±0.002	15.755±0.002	39.211±0.005	9.75	40.15	28.42	56.44
ZK005-202.80	方铅矿	18.612±0.002	15.776±0.002	39.276±0.006	9.79	40.52	29.85	58.73
ZK004-18.80	方铅矿	18.625±0.002	15.794±0.002	39.340±0.005	9.82	40.88	31.08	60.99
PH003	黄铁矿	18.555±0.003	15.702±0.003	39.036±0.007	9.65	39.13	24.79	50.07	文献[14]
PH025	闪锌矿	18.545±0.002	15.694±0.002	39.011±0.005	9.63	39.00	24.26	49.27
PH026	黄铁矿	18.557±0.002	15.705±0.002	39.045±0.005	9.65	39.18	25.00	50.4
	黄铜矿	18.567±0.002	15.717±0.001	39.085±0.004	9.68	39.41	25.81	51.79
	方铅矿	18.546±0.003	15.692±0.003	39.005±0.007	9.63	38.95	24.11	48.97
	闪锌矿	18.558±0.002	15.705±0.002	39.042±0.005	9.65	39.16	24.99	50.28
PH027	黄铁矿	18.547±0.001	15.697±0.001	39.020±0.003	9.64	39.06	24.46	49.60
PH027	黄铜矿	18.582±0.002	15.742±0.001	39.170±0.004	9.72	39.92	27.54	54.97
PH029	黄铜矿	18.586±0.003	15.746±0.003	39.182±0.008	9.73	39.98	27.81	55.38
PH029	方铅矿	18.542±0.002	15.692±0.001	39.004±0.004	9.63	38.97	24.13	49.08
PH032	黄铜矿	18.585±0.002	15.742±0.002	39.167±0.006	9.72	39.89	27.53	54.80
	方铅矿	18.580±0.002	15.744±0.002	39.171±0.004	9.73	39.95	27.69	55.18
	闪锌矿	18.549±0.002	15.702±0.002	39.040±0.004	9.65	39.18	24.81	50.36
PH034	黄铜矿	18.590±0.002	15.758±0.002	39.221±0.005	9.76	40.24	28.65	56.97
PH034	方铅矿	18.594±0.002	15.758±0.003	39.215±0.007	9.75	40.19	28.63	56.68
PH040	闪锌矿	18.568±0.002	15.721±0.002	39.098±0.004	9.68	39.49	26.09	52.32
PH042	黄铜矿	18.585±0.003	15.741±0.003	39.168±0.007	9.72	39.88	27.46	54.78