Ore-forming Fluids Characteristics of Fluorite Deposits in Gudongkeng, Jinyun County, Zhejiang Province

doi:10.11885/j.issn.1674-5086.2016.12.05.01

Abstract

Abstract: A large-scale fluorite deposit is located in Gudongkeng, Jinyun County, Zhejiang Province. Tectonically, it is located at the northeastern side of the Cathaysia Plate, adjacent to the Qinhang (Qinzhou Bay to Hangzhou Bay) bonding zone. The Gudongkeng fluorite deposit occurs in the contact zone of the Lower Cretaceous Guantou Group and Late Yanshan granite. The ore is strictly controlled by a NW-striking structure. Based on a systematical geological survey, studies were carried out on trace elements, rare earth elements, and fluid inclusions. The results show that the light rare earth in the Gudongkeng fluorite is a relatively weak enrichment and that the heavy rare earth is depleted relatively weakly. The fluorite has a strong Eu negative anomaly and a weak Ce negative anomaly. The distribution plots show a typical "V" shape feature. According to the La/HoY/Ho diagram, the fluorite samples in different positions show a tendency for recrystallization. The Tb/Ca-Tb/La diagram indicates that this fluorite is a hydrothermal genetic deposit. The temperature measurement results of fluid inclusions show a homogenizing temperature of ore-forming concentrates between 150 and 190℃. The salinity concentrates are between 0.3 and 1.5 NaCl equiv. The average density is 0.86 g/m³. The ore-forming fluids are characterized by medium-low temperature, low salinity, and a medium-low density NaCl H₂ Osystem. It can be inferred therefore that the fluorite deposit in Gudongkeng is a medium-low-temperature hydrothermal, fracture-filled deposit.

Key words: fluorite deposit, fluid inclusion, trace element, rare earth element(REE), Zhejiang

CLC Number:

TE122

FANG Yi, ZHONG Xiang, BAI Tiantian. Ore-forming Fluids Characteristics of Fluorite Deposits in Gudongkeng, Jinyun County, Zhejiang Province[J]. 西南石油大学学报(自然科学版), 2017, 39(3): 13-22.

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