Jurnal Internasional Re-evaluasi sumber cairan selama pembentukan skarn: penilaian skandal Gunung Kekaisaran, Sierra Nevada, AS – Ramos – – Geokimia, Geofisika, Geosystems
Re-evaluation of fluid sources during skarn formation: assessment of the Mount Empire scandal, Sierra Nevada, USA - Ramos - - Geochemistry, Geophysics, Geosystems
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Analysis of oxygen isotopes from mineral skarn has long been used to fingerprint variable fluid sources involved in skarn formation. The Empire Mountain skarn of the Sierra Nevada batholith (California, USA) was identified as a low skarn and was thought to be formed due to the involvement of surface fluids which were increased by fractures formed during host rock brecciization. Although geochemistry has good characteristics, the Mount Empire scandal is poorly understood in terms of its hydrodynamic history. In this study, we developed a two-dimensional model of oxygen isotope transport during the interaction of high temperature fluids to assess the mechanism with low garnet can form exclusive brecciation. Highlighting the areas closest to intrusion that can form garnet, we made three main observations: (1) oxygen isotope composition of liquid, and not temperature, dominant control 19 18 O garnet values; (2)> 6 ‰ increase δ 18 O garnet from negative to positive value, was observed during the maximum time frame of garnet thermodynamic stability; and (3) incremental emplacement of intrusions can produce oscillations in 19 18 O garnet values. Without pleading for brecciation, we find that a low garnet 19 18 can be formed without the presence of surface fluids; they are not sources 18 Pore pores of fluid from adjacent units. Furthermore, the surface liquid which does not balance with the surrounding rocks at depth becomes low - source liquid during the next stage of the pluton emplacement. This study underscores that the pore liquid at depth, regardless of its equilibrium state, can act as a low light source. 19 18 O and may be responsible for low- Garnet of high value.