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GEOREF RECORD

Acidic and sulfate-rich hydrothermal fluids from the Manus back-arc basin, Papua New Guinea

Toshitaka Gamo, Kei Okamura, Jean-Luc Charlou, Tetsuro Urabe, Jean-Marie Auzende, Junichiro Ishibashi, Kiminori Shitashima, Hitoshi Chiba, Ray A. Binns, Kaul Gena, Katell Henry, Osamu Matsubayashi, Roger Moss, Yoshiharu Nagaya, Jiro Naka and Etienne Ruellan
Acidic and sulfate-rich hydrothermal fluids from the Manus back-arc basin, Papua New Guinea
Geology (Boulder) (February 1997) 25 (2): 139-142

Abstract

Hot (+ or -88-120 degrees C) and acidic (pH< or =2.1) hydrothermal fluids rich in sulfate were discovered venting in the DESMOS caldera (depth = 1926 m), eastern Manus back-arc basin, Bismarck Sea, surrounded by Papua New Guinea. The abundant sulfate (> or =32.8 mM, higher than the seawater value of 28 mM) with elemental sulfur deposition around the vents, and remarkably low delta D(H (sub 2) O) and delta (super 34) S(H (sub 2) S) values (-8.1 per mil and -5.6 per mil, respectively), are suggestive of the incorporation of a magmatic fluid and the disproportionation of the exsolved SO (sub 2) from a magma body. The DESMOS fluid may be similar in origin to the acidic sulfate-chloride hot springs associated with subaerial volcanic activity. In contrast to the typical hydrothermal end member Mg concentration of 0, the DESMOS fluids are rich in Mg (46-52 mM), probably because of Mg dissolution by acid attack upon magnesium silicate minerals.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 25
Serial Issue: 2
Title: Acidic and sulfate-rich hydrothermal fluids from the Manus back-arc basin, Papua New Guinea
Affiliation: University of Tokyo, Ocean Research Institute, Tokyo, Japan
Affiliation: ManusFlux Cruise, Shipboard Scientific PartyInternational
Pages: 139-142
Published: 199702
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 34
Accession Number: 1997-020219
Categories: HydrochemistryOceanography
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 9708
Illustration Description: illus. incl. sketch maps
S03°41'30" - S03°41'30", E151°50'60" - E151°52'00"
Secondary Affiliation: IFREMER, Plouzane, FRA, FranceGeological Survey of Japan, Ibaraki, JPN, JapanCentral Research Institute of Electric Power Industry, Chiba, JPN, JapanKyushu University, Fukuoka, JPN, Japan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199707
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