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Science 25 August 1995:
Vol. 269. no. 5227, pp. 1092 - 1095
DOI: 10.1126/science.269.5227.1092
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Articles
The Effect of Magmatic Activity on Hydrothermal Venting Along the Superfast-Spreading East Pacific Rise
T. Urabe 1,
E. T. Baker 2,
J. Ishibashi 3,
R. A. Feely 2,
K. Marumo 1,
G. J. Massoth 2,
A. Maruyama 4,
K. Shitashima 5,
K. Okamura 6,
J. E. Lupton 7,
A. Sonoda 8,
T. Yamazaki 1,
M. Aoki 8,
J. Gendron 2,
R. Greene 7,
Y. Kaiho 9,
K. Kisimoto 1,
G. Lebon 2,
T. Matsumoto 9,
K. Nakamura 1,
A. Nishizawa 10,
O. Okano 11,
G. Paradis 7,
K. Roe 2,
T. Shibata 11,
D. Tennant 2,
T. Vance 2,
S. L. Walker 2,
T. Yabuki 10, and
N. Ytow 12
1 Geological Survey of Japan, 1-1, Higashi, Tsukuba, 305 Japan
2 Pacific Marine Environmental Laboratory, 7600 Sand Point Way North East, Seattle, WA 98115-0070, USA.
3 Laboratory for Earthquake Chemistry, Faculty of Science, University of Tokyo, Hongo, Tokyo, 113 Japan
4 National Institute of Bioscience and Human Technology, 1-1, Higashi, Tsukuba, 305 Japan
5 Central Research Institute of Electric Power Industry, Abiko, Abiko, Chiba, 270 Japan
6 Research Center for Instrumental Analyses, Kyoto University, Kitashirakawa, Kyoto, 606 Japan
7 M. O. Hatfield Marine Science Center, Pacific Marine Environmental Laboratory, Newport, OR 97365, USA.
8 Nippon Marine Enterprises Limited, 14, Ogawa-cho, Yokosuka, 238 Japan
9 Japan Marine Science and Technology Center, 2-15, Natsushima, Yokosuka, 237 Japan
10 Hydrographic Department, Maritime Safety Agency of Japan, 5-3, Tsukiji, Tokyo, 104 Japan
11 Department of Earth Sciences, Okayama University, Tsushima-naka, Okayama, 700 Japan
12 Institute of Biological Sciences, University of Tsukuba, Tsukuba, 305 Japan
A survey of hydrothermal activity along the superfast-spreading (approximately 150 millimeters per year) East Pacific Rise shows that hydrothermal plumes overlay approximately 60 percent of the ridge crest between 13°50' and 18°40'S, a plume abundance nearly twice that known from any other rige portion of comparable length. Plumes were most abundant where the axial cross section is inflated and an axial magma chamber is present. Plumes with high ratios of volatile (3He, CH4, and H2S) to nonvolatile (Mn and Fe) species marked where hydrothermal circulation has been perturbed by recent magmatic activity. The high proportion of volatile-rich plumes observed implies that such episodes are more frequent here than on slower spreading ridges.
Submitted on March 27, 1995
Accepted on June 19, 1995
THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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- Magmatic Degassing of Volatiles and Ore Metals into a Hydrothermal System on the Modern Sea Floor of the Eastern Manus Back-Arc Basin, Western Pacific.
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- The response of ridge-crest hydrothermal systems to segmented, episodic magma supply.
- R. M. Haymon (1996)
Geological Society, London, Special Publications
118, 157-168
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