Sequential trace element analysis of zoned skarn garnet: Implications for multi-stage fluxing and flow of magmatic fluid into a skarn system

Changyun Park, Chaewon Park, Yungoo Song, Seon Gyu Choi

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3 Citations (Scopus)

Abstract

A high-resolution fluid flux–flow model for a shallow crustal system related to skarn formation was established using oscillatory zoning in garnet. In situ analytical methods were used to determine major and trace element contents of andradite-rich and lower-andradite-content garnet zones. Continuous analysis of pure andradite (And87–98) shows these garnets record first- and second-order fluid fluxes. The first-order fluid flux exhibits a stepwise increase in Sn contents and a decrease in the contents of other elements (Ti, V, W, As, Mo, Y, and rare earth elements), indicating that pure andradite records a large range changes in fluid flux from the magma. The second-order flux is evident from oscillatory variations in the contents of Sn and other elements, reflecting small-scale and pulsed changes in the fluid flux from a degassing magma reservoir. Based on the garnet major and trace element variations and mineral textures, these fluid fluxes in the skarn system were controlled by pulsed degassing of a cooling magma. Continuous analysis of oscillatory zoning in garnet with a lower andradite content (And72–81) showed that Sn concentrations increase gradually and other element concentrations decrease gradually. This garnet crystallized from a fluid that was locally equilibrated with a small-scale, stagnant fluid. Thick and low-andradite garnet bands (And62–76) are observed to have grown between the first-order fluid fluxing events. These bands are Al-rich and have retrograde textures, indicating prolonged magma residence after the first-order fluid flux, suggesting that circulating fluids persisted for a relatively long time.

Original languageEnglish
Article number105213
JournalLithos
Volume350-351
DOIs
Publication statusPublished - 2019 Dec 15

Bibliographical note

Funding Information:
The authors are grateful to the anonymous reviewers and Daniel E. Harlov for their creative comments. This work was supported by National Research Foundation of Korea Grant No. 2018051418, and the Basic Research Project of the Korea Institute of Geoscience and Mineral Resources(KIGAM) funded by the Ministry of Science and ICT.

Funding Information:
The authors are grateful to the anonymous reviewers and Daniel E. Harlov for their creative comments. This work was supported by National Research Foundation of Korea Grant No. 2018051418 , and the Basic Research Project of the Korea Institute of Geoscience and Mineral Resources(KIGAM) funded by the Ministry of Science and ICT . Appendix A

Publisher Copyright:
© 2019 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology

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