西北地质2024，Vol.57Issue(4)：37-49,13.DOI:10.12401/j.nwg.2024052
浙江缙云县吾山萤石矿床成因:来自稀土元素、流体包裹体、红外光谱的制约
Genesis of Wushan Fluorite Deposit in Jinyun County,Zhejiang Province:Constraints from Fluorite Rare Earth Elements,Fluid Inclusions and Infrared Spectroscopy
摘要
Abstract
The Wushan fluorite deposit is located at the northeast end of the Cathaysia Block,in the central part of the fluorite mining area in Zhejiang Province.The deposit is located in the contact zone between the Guantou Formation of the Cretaceous and the Yanshan granite.The distribution of the ore body is controlled by north-west trending faults,and banded fluorite is developed.Based on geological surveys,research was conducted on rare earth elements,fluid inclusions,and infrared spectra of fluorite with different colors.The research results in-dicate that the rare earth element content and mineralization temperature of fluorite with different colors shows regular changes.From green fluorite to purple fluorite and then to yellow fluorite,δEu increases,the ∑REE de-creases,the LREE/HREE ratio increases and mineralization temperature decrease.Based on the geological char-acteristics of the deposit,this study suggests that the crystallization and mineralization process of the three col-ors of fluorite is a reducing environment with a large temperature range.The formation sequence of fluorite is that green fluorite is formed first,followed by purple fluorite,and yellow fluorite is formed latest.The Tb/Ca-Tb/La and La/Ho-Y/Ho diagrams and inclusion temperature measurements show that different colored fluorites in the area are formed from the same fluid source at different stages of the same mineralization period.The for-mation of banded fluorite is the result of periodic pulsation and upwelling of ore-forming hydrothermal fluids.Overall,the ore-forming fluid of the fluorite deposit in the study area belongs to medium low temperature,low salinity,and low-density F-containing hydrothermal fluids.In summary,the Wushan fluorite deposit belongs to the medium to low temperature hydrothermal fissure filling type fluorite deposit.关键词
稀土元素/流体包裹体/红外光谱/矿床成因/吾山萤石矿床Key words
rare earth elements/fluid inclusions/infrared spectroscopy/genesis of deposits/Wushan fluo-rite deposit分类
天文与地球科学引用本文复制引用
沈金祥,张建芳,曹华文,喻黎明,方乙,邹灏..浙江缙云县吾山萤石矿床成因:来自稀土元素、流体包裹体、红外光谱的制约[J].西北地质,2024,57(4):37-49,13.基金项目
国家自然科学基金(42272129),成都理工大学珠峰科学研究计划(80000-2021ZF11414),四川省自然科学基金杰出青年科学基金(23NSFJQ0162),四川省自然资源科研项目(KJ-2023-011),浙江省级基础性公益性战略性地质资金项目([省资]2023019)联合资助. （42272129）
