Progress on Metallogenic Research of Granite-related Uranium Deposits from Luzong Ore District in the Middle and Lower Reaches of Yangtze River Metallogenic Belt

doi:10.19657/j.geoscience.1000-8527.2023.083

Abstract

Abstract:

The Lujiang-Zongyang ore district is one of the most important ore cluster regiones in the Middle and Lower Reaches of the Yangtze River Metallogenic Belt, and is also an important uranium prospecting area in the South China Uranium Province.Systematic uranium metallogenic study would benefit the understanding of the regional metallogenic theory and uranium prospecting.In this paper, we provide a review of the geological features, uranium-bearing intrusions, magmatic and metallogenic ages, ore-forming fluids, and uranium sources of the typical uranium deposits in the Lujiang-Zongyang ore district.The uranium deposits along the NE-trending A-type granite belt are controlled by intrusive contact, faults, and interlayer structures.The uranium deposits were formed at 114-108 Ma, whereas the ore-bearing granites are A1-type and were formed at 127-123 Ma with 115-110 Ma alkali feldspar granitic stocks.The ore-forming materials were derived from the ore-bearing intrusions and wall-rocks.The ore-forming fluids were the mixture of magmatic water and meteoric water.The uranium was likely originated from the leaching of the ore-bearing intrusions during the fluid circulation, and deposited by changes in the physicochemical condition.The uranium mineralization in the Luzong basin was controlled by concealed syenite and was formed at 131-129 Ma.The ore-bearing intrusions, which provide the ore-material sources, are of shoshonitic and were formed at 131 Ma.The ore-forming fluids were mainly of magmatic water.The uranium was probably fractionated from the F-B-rich melt into the magmatic fluids, and uraniferous veins were formed as the pressure and/or temperature dropped.We suggest that the granite uranium fertility indicator, high-precision dating of uranium deposits, and the genetic link between mantle-derived material and uranium mineralization are important research topics in future.

Key words: Lujiang-Zongyang ore district, granite-related uranium deposit, uranium metallogeny, A-type granite, metallogenic and magmatic age, ore-material source

CLC Number:

P611.1
P617

ZHANG Shu, ZHANG Zanzan, HU Zhaoqi, SHI Lisheng, ZHOU Taofa, WU Ming'an, DU Jianguo. Progress on Metallogenic Research of Granite-related Uranium Deposits from Luzong Ore District in the Middle and Lower Reaches of Yangtze River Metallogenic Belt[J]. Geoscience, 2023, 37(06): 1435-1448.

Figures/Tables 9

Fig.1 Simplified geological map of Southeast China, showing the distribution of major granite-related uranium deposits and gra-nitoids (modified from Zhang et al.[23])

Fig.2 Geological sketch map of the Lujiang-Zongyang ore district (modified from Zhang et al.[23])

Fig.3 Geological profiles of typical uranium deposits in Lujiang-Zongyang ore district (modified from Shao[30])

Fig.4 Hand-specimen photos and micrographs of ores in typical uranium deposits in the Lujiang-Zongyang ore district

Fig.5 Age histogram for the uranium deposits and U-bearing intrusions in A-type granite belt of the Lujiang-Zongyang ore district (age data from refs.[5,10???????-18,26,28,33??????-40,44-45])

Fig.6 Geochemical discrimination diagrams of U-bearing intrusions in the Lujiang-Zongyang ore district

Fig.7 Chondrite-normalized REE distribution patterns (a) and εNd(t)-(87Sr/86Sr)i diagram (b) of U-bearing intrusions in the Lujiang-Zongyang ore district

Fig.8 Zircon CL and BSE images from alkali feldspar granite in Huangmeijian pluton (modified after Zhang et al.[54])

Fig.9 Uranium metallogenic model in the Lujiang-Zongyang ore district

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