Ore-forming fluid characteristics and genesis of vein-type lead-zinc mineralization of Xiaohongshilazi deposit,Jilin Province,China |
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| Authors: | LI Yong REN Yunsheng HAO Yujie YANG Qun |
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| Institution: | College of Earth Sciences, Jilin University, Changchun 130061, China |
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| Abstract: | The Xiaohongshilazi mineral deposit in Jilin Province , China, is located in the accretion zone in the northern margin of the North China Block .The deposit contains two types of ore bodies: layered Pb-Zn ore bodies in volcanic rock and vein-hosted Pb-Zn ore bodies controlled by fractures .The vein Pb-Zn ore bodies are strictly controlled by tectonic fracture zones trending in S-N direction, which comprise sulfide veins or sulfide-bearing quartz veins distributed along faults or structural fissures .The ores mainly appear mesh-vein and vein structures , and also show solid-solution separation and metasomatic textures .The metal minerals are mainly sphalerite, galena, and pyrite, etc.Wall-rock alteration includes mainly sericitization , chloritization, silicifica-tion and carbonatization , etc.Microscope observations and Raman spectroscopy analyses indicate that the ore -forming fluid of the vein Pb-Zn ore bodies was mainly magmatic water with low temperature , low salinity, and a shallow depth of metallogenesis (~1 .5 km) .Sulfur and lead isotope analyses indicate that the sulfide source is mainly formation sulfur or biogenic sulfur , which is similar to the sulfur source of hydrothermal deposit ( nega-tive (δ34 S values ) , while the main Pb source was the upper crust with some mantle input .This article argues that the vein Pb-Zn ore body of the Xiaohongshilazi deposit is a low-to medium-temperature hydrothermal vein type related to the formation of a shallow magma chamber . |
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| Keywords: | ore-forming fluid characteristics ore genesis hydrothermal vein type Xiaohongshilazi Pb-Zn de-posit Jilin Province |
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