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Numerical modelling of rare earth element fractionation trends in garnet: a tool to monitor skarn evolution
Contributions to Mineralogy and Petrology ( IF 3.5 ) Pub Date : 2020-03-16 , DOI: 10.1007/s00410-020-1670-7 Jing Xu , Cristiana L. Ciobanu , Nigel J. Cook , Youye Zheng , Xiaofeng Li , Benjamin P. Wade , Max R. Verdugo-Ihl , Wenyuan Gao , Qiaoqiao Zhu
Contributions to Mineralogy and Petrology ( IF 3.5 ) Pub Date : 2020-03-16 , DOI: 10.1007/s00410-020-1670-7 Jing Xu , Cristiana L. Ciobanu , Nigel J. Cook , Youye Zheng , Xiaofeng Li , Benjamin P. Wade , Max R. Verdugo-Ihl , Wenyuan Gao , Qiaoqiao Zhu
Proximal and distal garnets from skarns at Jiaduobule, Tibet, are used to demonstrate how variation in the fluid composition and parameters such as salinity, pH, f O 2 , and $${\text{X}}_{{\rm CO}_{2}}$$ X CO 2 will impact on rare earth element (REE) distribution in garnets, and also to constrain skarn evolution across the orefield from proximal (Fe mineralization) to distal (Cu mineralization). These garnets display a diversity from proximal to distal skarn which is expressed in mineral assemblages, textures, major to trace element contents, and particularly, chondrite-normalized REE fractionation trends. The empirical variation among REE fractionation trends, determined from laser ablation inductively coupled-plasma mass spectrometry data, can be numerically modelled in terms of variable fluid compositions and physicochemical parameters, among which the key determining factors are salinity, pH, $${\text{X}}_{{{\text{CO}}_{{2}} }}$$ X CO 2 and Ca content buffered from the rock-fluid reaction with carbonate rocks. Modelling REE trends in skarn garnet is shown to be valuable for constraining conditions during garnet formation and a useful tool for monitoring the evolution of complex skarn deposits.
更新日期：2020-03-16
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