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Geology, Geochemistry and Genesis of the Caijiaping Lead-Zinc Deposit, North Wuyi Area, Jiangxi Province

Author: DaiYanZuo
Tutor: YuXinQi
School: Chinese Geology University (Beijing)
Course: Structural Geology
Keywords: METALLOGENIC Petrology and Geochemistry Sulfur lead isotope Metallogenic age and causes North Wuyi area
CLC: P618.4
Type: Master's thesis
Year: 2011
Downloads: 89
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Abstract


The North Wuyi Cai Jia Ping deposit is a new discovery in recent years, a medium-sized lead-zinc deposits. Deposit ore-bearing rock is a the Jurassic North Water Group, Zhangping Group sandstone, lead and zinc body prolific fracture flanking broken belt and rhyolite porphyry and sandstone contact with. Combined with field investigations, microscopy, and electron microprobe analysis, preliminary metallogenic process is divided into sedimentary mineralization period, the the magmatic hydrothermal period supergene period, magmatic hydrothermal stage, including in the high-temperature pyrite - sphalerite phase low-temperature quartz - sulfide phase and carbonate phases. Of high temperature pyrite - sphalerite phase characteristics in coarse subhedral - since shaped pyrite and iron-rich sphalerite combination, to with epidotization alteration reflects a higher formation temperature; low temperature quartz - sulfide stage is the main mineralization stage, the principal ore mineral assemblage flash the the zinc mine chalcopyrite, galena, pyrite alteration types are mainly silicification, chloritization and sericitization. The magmatic hydrothermal sulfide trace element analysis led metallogenic. Sulfur isotope analysis showed that the sulfur mine magma source, the participation of the deep source of magma. The lead isotope analysis into minerals at the same time from the the rhyolite porphyry ore-bearing sandstone with a crust-mantle mixed source characteristics and ore-forming metal elements. Geochemical analysis show that the ore-bearing sandstone provenance tectonic setting of the continental margin, the diagenetic material sources may Wuyi metamorphic basement;-K calc-alkaline rhyolite porphyry S-type granites, formed in the Early Cretaceous extensional tectonic setting from Wuyi metamorphic basement remelting. According the chlorite thermometer the Cd element geological thermometer, sulfur isotope thermometer mineralization temperature 292.3 ℃ ~ 490.6 ℃, mineralization temperature is in the high-temperature areas, trace element analysis results. F4 broken ore fault zones within felsic veins K-feldspar 40Ar / 39Ar age implied mineralization age as early as 120 ± 4 Ma. Combined with the results of previous studies speculate that the Cai Jia Ping-lead-zinc deposits mineralization era for 138 ~ 120 Ma, with the South China stretch mineralization stages corresponding. Comprehensive analysis of the results that Cai Jia Ping, lead-zinc deposits formed in the Early Cretaceous South China stretch mineralization stages are temperature magmatic hydrothermal deposits, the magmatic hydrothermal dominated mineralization. Combined with the results of the field survey, the results of previous studies and isotope tracer analysis, source that the Fu ores strata mine layer, there is the role of the stratabound; Wuyi metamorphic basement is a huge contribution to the mining area diagenetic mineralization.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Non-ferrous metals
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