| Title | THE CHARACTERISTICS OF HYDROTHERMAL ALTERATION AT STEAMING GROUND IN THE NORTHEASTERN PART OF TATUN VOLCANO GROUP, TAIWAN |
|---|---|
| Authors | M. Fujisaki, S. Taguchi, H. Chiba, Y. Lu, S. Song, K. Watanabe, K. Yonezu |
| Year | 2019 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | geothermal, silicified rock, fluid inclusion, sulfur isotope, Tatun |
| Abstract | Geological and geochemical research was conducted to clarify characteristics of hydrothermal alteration of steaming ground located near Mt. Huangtsui, northeastern part of Tatun Volcano Group. Steaming ground has been altered by acidic hydrothermal alteration to form silicified rocks, which are massive at the Sih-Huang-Ping (SHP) and occurred along NE trending fault zone in the Huang-Shan (HS). The fault zone at the Huang-Shan is accompanied by quartz veins. Alunite zones are developed surrounding the silicified zones, especially at Huang-Shan. The sulfur isotopic ratio of alunite from the Huang-Shan is high and indicates a hypogene origin. Although the hot springs from the Sih-Huang-Ping are steam-heated water at present, volcanic acid fluid with Cl-SO4 type is present in the Huang Shan. The fluid inclusion temperatures of quartz from hydrothermal breccia at the Huang-Shan show boiling and higher homogenization temperature whereas those from quartz veins show boiling but lower temperatures. |