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Fluid sources and precipitation mechanisms of Pb–Zn–(Cu) sulphide–sulphate in the Iheya North Knoll hydrothermal field, Okinawa Trough: insights from fluid inclusions, He and Ar isotopes by Yang, Zhifeng; Zhai, Shikui; Yu, Zenghui; Zhang, Xia; Xu, Jie; Su, Fei is a Earth and Planetary Sciences article available to read on EtoBox.

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The Okinawa Trough is an extensive back-arc basin that was formed by the subduction of the Philippine Sea plate beneath the Eurasian continent. Instances of Zn-Pb-(Cu) mineralization, which are typically associated with volcanism, are commonly found in many of the hydrothermal fields throughout this trough. We analysed the fluid inclusions and helium isotopic compositions of samples collected from the sulphide-sulphate chimneys/mounds in the Iheya North Knoll hydrothermal field in the Middle Okinawa Trough. For fluid inclusions in sphalerite and anglesite, we found that the homogenization temperatures ranged from 288°C to 345°C and 242°C to 370°C, while the salinity values ranged from 5.45 to 10.55 wt.% NaCl equiv. and 6.45 to 8.55 wt.% NaCl equiv., respectively. Microthermometry results from these inclusions yielded temperatures of 330° C-350°C; at these temperatures, seawater may have been boiling during the ore formation process. These data, in addition to measurement of high hydrothermal fluid 3 He/ 4 He ratios (6.5 to 7.8 Ra), suggest that the fluid is mainly derived from the back-arc basin basalts (BABBs), and have been mixed with a small amount of seawater. Moreover, the 3 H

Who reads Fluid sources and precipitation mechanisms of Pb–Zn–(Cu) sulphide–sulphate in the Iheya North Knoll hydrothermal field, Okinawa Trough: insights from fluid inclusions, He and Ar isotopes?

Author

Yang, Zhifeng; Zhai, Shikui; Yu, Zenghui; Zhang, Xia; Xu, Jie; Su, Fei

Publisher

Taylor and Francis Group; Informa UK (Taylor & Francis); Taylor & Francis; Informa UK Limited (ISSN 0020-6814)

Published

2020

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)