Acid-sulphate alteration and mineralisation related to influx of magmatic fluid in Desmos caldera, Manus Basin, Papua New Guinea

Gena Kaul; 千葉 仁; 水田 敏夫; 石山 大三

doi:10.14824/jampeg.2004.0.17.0

2004 Annual Meeting

Session ID : G3-01

DOI https://doi.org/10.14824/jampeg.2004.0.17.0

Conference information

Host: The Japanese Association of Mineralogists, Petrologists and Economic Geologists

G3: Transportation mechanism of elements and natural resources

Acid-sulphate alteration and mineralisation related to influx of magmatic fluid in Desmos caldera, Manus Basin, Papua New Guinea

*Kaul Gena, Hitoshi Chiba, Toshio Mizuta, Daizo Ishiyama

Author information

Keywords: Manus back-arc basin, Desmos caldera, Onsen site, acid sulfate alteration, magmatic fluid

CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract

The Onsen site in the Desmos caldera of the Manus back-arc basin is a typical acid-sulfate mineralisation on the seafloor which is denoted by three stages of advanced argillic alteration. High concentration of Mg and SO4 in the Onsen fluid, depletion of major, minor and REE is altered rock and presence of high and low temperature acid stable minerals suggest that mineralisation is related to fluctuating influx of magmatic fluid.

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