Acidic 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 Binns; Kaul Gena; Katell Henry; Osamu Matsubayashi; Takeshi Matsumoto; Roger Moss; Yoshiharu Nagaya; Jiro Naka; Etienne Ruellan

doi:10.1130/0091-7613(1997)025<0139:AASRHF>2.3.CO;2

Acidic 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 Binns, Kaul Gena, Katell Henry, Osamu Matsubayashi, Takeshi Matsumoto, Roger Moss, Yoshiharu Nagaya, Jiro Naka, Etienne Ruellan

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154 Citations (Scopus)

Abstract

Hot (≥ 88-120 °C) and acidic (pH≤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 (≥32.8 mM, higher than the seawater value of 28 mM) with elemental sulfur deposition around the vents, and remarkably low δD(H₂O) and δ³⁴S(H₂S) values (-8.1‰ and -5.6‰, respectively), are suggestive of the incorporation of a magmatic fluid and the disproportionation of the exsolved SO₂ 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.

Original language	English
Pages (from-to)	139-142
Number of pages	4
Journal	Geology
Volume	25
Issue number	2
DOIs	https://doi.org/10.1130/0091-7613(1997)025<0139:AASRHF>2.3.CO;2
Publication status	Published - 1997
Externally published	Yes

ASJC Scopus subject areas

Geology

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10.1130/0091-7613(1997)025<0139:AASRHF>2.3.CO;2

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Gamo, T., Okamura, K., Charlou, J. L., Urabe, T., Auzende, J. M., Ishibashi, J., Shitashima, K., Chiba, H., Binns, R., Gena, K., Henry, K., Matsubayashi, O., Matsumoto, T., Moss, R., Nagaya, Y., Naka, J., & Ruellan, E. (1997). Acidic sulfate-rich hydrothermal fluids from the Manus back-arc basin, Papua New Guinea. Geology, 25(2), 139-142. https://doi.org/10.1130/0091-7613(1997)025<0139:AASRHF>2.3.CO;2

Gamo, T, Okamura, K, Charlou, JL, Urabe, T, Auzende, JM, Ishibashi, J, Shitashima, K, Chiba, H, Binns, R, Gena, K, Henry, K, Matsubayashi, O, Matsumoto, T, Moss, R, Nagaya, Y, Naka, J & Ruellan, E 1997, 'Acidic sulfate-rich hydrothermal fluids from the Manus back-arc basin, Papua New Guinea', Geology, vol. 25, no. 2, pp. 139-142. https://doi.org/10.1130/0091-7613(1997)025<0139:AASRHF>2.3.CO;2

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abstract = "Hot (≥ 88-120 °C) and acidic (pH≤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 (≥32.8 mM, higher than the seawater value of 28 mM) with elemental sulfur deposition around the vents, and remarkably low δD(H2O) and δ34S(H2S) values (-8.1‰ and -5.6‰, respectively), are suggestive of the incorporation of a magmatic fluid and the disproportionation of the exsolved SO2 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.",

author = "Toshitaka Gamo and Kei Okamura and Charlou, {Jean Luc} and Tetsuro Urabe and Auzende, {Jean Marie} and Junichiro Ishibashi and Kiminori Shitashima and Hitoshi Chiba and Ray Binns and Kaul Gena and Katell Henry and Osamu Matsubayashi and Takeshi Matsumoto and Roger Moss and Yoshiharu Nagaya and Jiro Naka and Etienne Ruellan",

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AU - Gamo, Toshitaka

AU - Okamura, Kei

AU - Charlou, Jean Luc

AU - Urabe, Tetsuro

AU - Auzende, Jean Marie

AU - Ishibashi, Junichiro

AU - Shitashima, Kiminori

AU - Chiba, Hitoshi

AU - Binns, Ray

AU - Gena, Kaul

AU - Henry, Katell

AU - Matsubayashi, Osamu

AU - Matsumoto, Takeshi

AU - Moss, Roger

AU - Nagaya, Yoshiharu

AU - Naka, Jiro

AU - Ruellan, Etienne

PY - 1997

Y1 - 1997

N2 - Hot (≥ 88-120 °C) and acidic (pH≤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 (≥32.8 mM, higher than the seawater value of 28 mM) with elemental sulfur deposition around the vents, and remarkably low δD(H2O) and δ34S(H2S) values (-8.1‰ and -5.6‰, respectively), are suggestive of the incorporation of a magmatic fluid and the disproportionation of the exsolved SO2 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.

AB - Hot (≥ 88-120 °C) and acidic (pH≤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 (≥32.8 mM, higher than the seawater value of 28 mM) with elemental sulfur deposition around the vents, and remarkably low δD(H2O) and δ34S(H2S) values (-8.1‰ and -5.6‰, respectively), are suggestive of the incorporation of a magmatic fluid and the disproportionation of the exsolved SO2 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.

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

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