Sulfur and Lead Isotopic Compositions of Zebuxia Pb-Zn Deposit in Tibet:Implications for the Sources of Ore-forming Material

doi:10.19657/j.geoscience.1000-8527.2022.04.16

Abstract

Abstract:

Zebuxia Pb-Zn deposit in Tibet is located in the western part of the north Gangdean metallogenic belt,and it occurs in the Dianzhong Formation of Paleogene. Based on analysis of the metallogenic geological conditions,this paper studies systematically the composition characteristics of sulfur and lead isotope in the ore minerals and discusses the sources of the ore-forming materials. The results have shown that the composition of sulfur isotope in ore sulfides has a narrow variation range from -0.6‰ to 2.7‰ and a tower distribution features,which indicates relatively concentrate and presents a characteristic of sulfur from magmatic origin,and may be related to the lots of granite porphyry or concealed granite. The lead isotopic composition of ore sulfides is stable and should belong to ordinary lead. According to the μ values range from 9.61 to 10.0 and the tectonic evolution diagram of lead isotopic,it can be concluded that the ore lead mainly derived from upper crust. Combined with regional diagenesis-metallogenic event and geological characteristics of Zebuxia Pb-Zn deposit,the ore-forming materials probably came from the magma formed by partial melting of the upper crust in the period of main collisional setting in Tibetan orogenic belt.

Key words: sulfur isotope, lead isotope, sources of ore-forming material, Zebuxia Pb-Zn deposit, Tibet

CLC Number:

P618.4
P597

DU Baofeng, ZHANG Rongzhen, YANG Changqing, LI Shanpo, TAN Heyong, ZHU Hongyun. Sulfur and Lead Isotopic Compositions of Zebuxia Pb-Zn Deposit in Tibet:Implications for the Sources of Ore-forming Material[J]. Geoscience, 2022, 36(04): 1138-1145.

Figures/Tables 8

References 49

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样号	测定矿物	矿石特征	δ³⁴S_V-CDT/‰
ZB/S1	方铅矿	团块状	1.6
ZB/S2	方铅矿	脉状	0.7
ZB/S3	方铅矿	脉状	-0.6
ZB/S6	方铅矿	浸染状	0.1
ZB/S8	方铅矿	脉状	2.4
ZB/S9	方铅矿	浸染状	1.7
ZB/S10	方铅矿	团块状	1.7
ZB/S4	黄铁矿	浸染状	1.8
ZB/S5	黄铁矿	脉状	2.7

样号	测定矿物	矿石特征	δ³⁴S_V-CDT/‰
ZB/S1	方铅矿	团块状	1.6
ZB/S2	方铅矿	脉状	0.7
ZB/S3	方铅矿	脉状	-0.6
ZB/S6	方铅矿	浸染状	0.1
ZB/S8	方铅矿	脉状	2.4
ZB/S9	方铅矿	浸染状	1.7
ZB/S10	方铅矿	团块状	1.7
ZB/S4	黄铁矿	浸染状	1.8
ZB/S5	黄铁矿	脉状	2.7

样号	测定矿物	²⁰⁶Pb/²⁰⁴Pb	2σ	²⁰⁷Pb/²⁰⁴Pb	2σ	²⁰⁸Pb/²⁰⁴Pb	2σ	μ	ω	Th/U	Δβ	Δγ
ZB/S1	方铅矿	18.637	0.002	15.692	0.004	39.087	0.010	9.62	38.77	3.90	23.83	48.25
ZB/S2	方铅矿	18.725	0.003	15.838	0.007	39.488	0.014	9.90	41.35	4.04	33.87	64.17
ZB/S3	方铅矿	18.812	0.003	15.896	0.006	39.596	0.012	10.0	41.45	4.01	37.69	64.75
ZB/S4	黄铁矿	18.808	0.006	15.806	0.001	39.454	0.006	9.83	40.40	3.98	31.35	58.94
ZB/S5	黄铁矿	18.690	0.004	15.792	0.002	39.367	0.003	9.81	40.59	4.00	30.73	59.56
ZB/S6	方铅矿	18.643	0.002	15.683	0.002	39.092	0.005	9.61	38.67	3.90	23.18	47.73
ZB/S8	方铅矿	18.650	0.001	15.691	0.001	39.119	0.003	9.62	38.82	3.91	23.72	48.67
ZB/S9	方铅矿	18.761	0.002	15.833	0.002	39.590	0.005	9.88	41.50	4.07	33.40	65.52
ZB/S10	方铅矿	18.762	0.005	15.830	0.005	39.579	0.013	9.88	41.42	4.06	33.18	65.04

样号	测定矿物	²⁰⁶Pb/²⁰⁴Pb	2σ	²⁰⁷Pb/²⁰⁴Pb	2σ	²⁰⁸Pb/²⁰⁴Pb	2σ	μ	ω	Th/U	Δβ	Δγ
ZB/S1	方铅矿	18.637	0.002	15.692	0.004	39.087	0.010	9.62	38.77	3.90	23.83	48.25
ZB/S2	方铅矿	18.725	0.003	15.838	0.007	39.488	0.014	9.90	41.35	4.04	33.87	64.17
ZB/S3	方铅矿	18.812	0.003	15.896	0.006	39.596	0.012	10.0	41.45	4.01	37.69	64.75
ZB/S4	黄铁矿	18.808	0.006	15.806	0.001	39.454	0.006	9.83	40.40	3.98	31.35	58.94
ZB/S5	黄铁矿	18.690	0.004	15.792	0.002	39.367	0.003	9.81	40.59	4.00	30.73	59.56
ZB/S6	方铅矿	18.643	0.002	15.683	0.002	39.092	0.005	9.61	38.67	3.90	23.18	47.73
ZB/S8	方铅矿	18.650	0.001	15.691	0.001	39.119	0.003	9.62	38.82	3.91	23.72	48.67
ZB/S9	方铅矿	18.761	0.002	15.833	0.002	39.590	0.005	9.88	41.50	4.07	33.40	65.52
ZB/S10	方铅矿	18.762	0.005	15.830	0.005	39.579	0.013	9.88	41.42	4.06	33.18	65.04