HYDROTHERMAL MINERALIZATION OF PB-ZN CHIMNEY IN THE WESTERN TA25 CALDERA, TONGA ARC

Title
HYDROTHERMAL MINERALIZATION OF PB-ZN CHIMNEY IN THE WESTERN TA25 CALDERA, TONGA ARC
Author(s)
문재운; 박상준; 최상훈; 김현섭; 최선기
KIOST Author(s)
Kim, Hyun Sub(김현섭)Choi, Sun Ki(최선기)
Alternative Author(s)
문재운; 박상준; 김현섭; 최선기
Publication Year
2016-06-15
Abstract
Korea Institute of Ocean Science and Technology has conducted research and development programs for exploitation of seafloor massive sulphide deposits on the exclusive economic zone of the Kingdom of Tonga since 2008. The seafloor hydrothermal sulphide vents and mounds have been found on the western TA25 subsea volcano caldera in the Tonga arc. The hydrothermal vents and mounds are densely populated within SW-trending radial fractures. The short chimney and simple sulphide assemblage reflects these hydrothermal vents are immature in incipient stage. These active chimneys are emitting the transparent fluids of which temperatures range from 150°C to 242°C (average=203°C). The hydrothermal ores recovered by remotely-operated vehicle (ROV) mainly comprise sulphides such as sphalerite, pyrite, marcasite, galena, chalcopyrite, covellite, tennantite, enargite and sulfates such as barite, gypsum/anhydrite. Sphalerite is predominant sulphides in chimneys and mounds, indicating Zn-rich hydrothermal mineralization is dominant. The hydrothermal ores also have minor enargite, implying that mineralization occurred in high sulphidation environment.The FeS content of sphalerite and its proportion increase from outside to inside of the hydrothermal chimney, respectively. Sphalerite from the chimney, in particular, shows a great silver content (up to ~10 wt.%). Chalcopyrite is examined in both mound and chimney but it is more mal sulphide vents and mounds have been found on the western TA25 subsea volcano caldera in the Tonga arc. The hydrothermal vents and mounds are densely populated within SW-trending radial fractures. The short chimney and simple sulphide assemblage reflects these hydrothermal vents are immature in incipient stage. These active chimneys are emitting the transparent fluids of which temperatures range from 150°C to 242°C (average=203°C). The hydrothermal ores recovered by remotely-operated vehicle (ROV) mainly comprise sulphides such as sphalerite, pyrite, marcasite, galena, chalcopyrite, covellite, tennantite, enargite and sulfates such as barite, gypsum/anhydrite. Sphalerite is predominant sulphides in chimneys and mounds, indicating Zn-rich hydrothermal mineralization is dominant. The hydrothermal ores also have minor enargite, implying that mineralization occurred in high sulphidation environment.The FeS content of sphalerite and its proportion increase from outside to inside of the hydrothermal chimney, respectively. Sphalerite from the chimney, in particular, shows a great silver content (up to ~10 wt.%). Chalcopyrite is examined in both mound and chimney but it is more
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/24711
Bibliographic Citation
MINERALS OF THE OCEAN-8&DEEP-SEA MINERALS AND MINING-5, 2016
Publisher
VNIIOKEANGEOLOGIA
Type
Conference
Language
English
Publisher
VNIIOKEANGEOLOGIA
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