- journal_title：Economic Geology
- Contributor：Yao-hui Jiang ; Hong-fei Ling ; Shao-yong Jiang ; Wei-zhou Shen ; Hong-hai Fan ; Pei Ni
- Publisher：Society of Economic Geologists
- Date：2006-
- Format：text/html
- Language：en
- Identifier：10.2113/gsecongeo.101.8.1613
- journal_abbrev：Economic Geology
- issn：0361-0128
- volume：101
- issue：8
- firstpage：1613
- section：Scientific Communications
The trace element and Sr-Nd isotope geochemistry of fluorite have been investigated in the Xiangshan volcanic rock-hosted uranium deposit in southeast China. Detailed Sr-Nd isotope data of the hydrothermal fluorite closely associated with the uranium mineralization suggest that ore-forming fluids were a combination of mantle-derived fluid and fluids equilibrated with basement metamorphic rocks. This model is consistent with previously published H-O isotope data and is incompatible with meteoric water as the only ore-forming fluid. Trace element geochemical profiles across the uranium orebody can be interpreted to reflect reaction between the host rocks and a mantle-derived fluid containing high U and Th with low Th/U ratios. The mantle-derived fluid is considered to have been U-, F- and carbonate-rich. Mixing with shallowly circulated meteoric water within the fractures of the host volcanic rocks caused dilution and cooling of the ore-forming fluid and subsequent precipitation of fluorite and uranium ore.