钦杭成矿带金山造山型金矿成矿年代学研究

doi:10.11872/j.issn.1005-2518.2018.04.443

Abstract

Abstract:

Qinhang metallogenic belt is located along the suture zone between Yangtze and Cathaysia blocks in South China，and its northeastern section is featured by large scale Cu-Au-Pb-Zn-Ag polymetallic deposits.Jinshan gold deposit is one of the largest gold deposits in this belt，the ore genesis and formation age remain in dispute.On the basis of detailed ore deposit geology and fluid inclusion studies，the quartz vein type orebodies was selected to conduct quartz fluid inclusion Rb-Sr isotope dating.The results show that samples from the V5 gold orebodies give a quartz fluid inclusion Rb-Sr isochron age of （751±98）Ma，and those from the V7 gold orebodies yield a quartz fluid inclusion Rb-Sr isochron age of （754±62）Ma.Two ages are consistent with the error ranges.In addition，the initial⁸⁷Sr/⁸⁶Sr values of fluid inclusions hosted in auriferous quartz are （0.7056±0.0039）~（0.7103±0.0025），suggesting that the ore-forming fluids were derived from the low maturity basement strata.To sum up，Jinshan gold deposit belongs to the Neoproterozoic orogenic gold deposit，instead of Caledonian or Yanshanian periods of tectono-magmatic products.

Key words: fluid inclusion Rb-Sr dating, quartz, Neoproterozoic, Jinshan gold deposit, Qinhang metallogenic belt, South China

CLC Number:

P618.51

Guoguang WANG,Chao ZHAO,Pei NI,Zheng LIU. Geochronological Study on the Jinshan Orogenic Gold Deposit in the Qinhang Metallogenic Belt[J].Gold Science and Technology, 2018, 26(4): 443-453.

Figures/Tables 6

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矿体名称	序号	样号	矿物名称	w（Rb）/（×10^-6）	w（Sr）/（×10^-6）	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr	2σ
V5矿体含金石英脉	1	JS050	石英	0.987	2.159	1.320	0.72002	0.00002
V5矿体含金石英脉	2	JS014	石英	1.724	1.754	2.841	0.73569	0.00003
V5矿体含金石英脉	3	JS014	石英	1.747	1.796	2.812	0.73542	0.00001
V5矿体含金石英脉	4	JS058	石英	1.835	1.489	3.565	0.74432	0.00002
V5矿体含金石英脉	5	JS044	石英	0.6119	1.654	1.068	0.72144	0.00001
V7矿体含金石英脉	1	JS076	石英	1.577	4.417	1.030	0.72072	0.00001
V7矿体含金石英脉	2	JS220	石英	1.699	3.606	1.360	0.72335	0.00001
V7矿体含金石英脉	3	JS221	石英	1.844	1.185	4.509	0.75906	0.00001
V7矿体含金石英脉	4	JS229	石英	1.228	2.589	1.370	0.72568	0.00003
V7矿体含金石英脉	5	JS221	石英	1.845	1.197	4.466	0.7581	0.00002
V7矿体含金石英脉	6	JS229	石英	1.042	2.488	1.210	0.72482	0.00002

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Geochronological Study on the Jinshan Orogenic Gold Deposit in the Qinhang Metallogenic Belt

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