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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

The internal structure of an active sea-floor massive sulphide deposit

Article Abstract:

The massive sulphide deposit on the Mid-Atlantic ridge is dependent on the presence of anhydrite and grows as an in situ breccia pile. This layer is formed during successive periods of hydrothermal activity that creates new hydrothermal precipitates and strengthens the previous deposit. During periods of hydrothermal inactivity, the brecciation of the deposits is initiated by the breakup of the sulphide chimneys, rupturing of anhydrite, and disordering by faulting. The high temperature within the mound is due to the hydrothermal circulation of the sea water through permeable ocean crust.

Author: Becker, K., Brown, D., Zhao, X., Nakamura, K., Smith, S., Fouquet, Y., Tivey, M.K., Humphris, Susan E., Herzig, P.M., Miller, D.J., Alt, J.C., Brugmann, G., Chiba, H., Gemmell, J.B., Guerin, G., Hannington, M.D., Holm, N.G., Honnorez, J.J., Iturrino, G.J., Knott, R., Ludwig, R., Petersen, S., Reysenbach, A-L., Rona, P.A., Sturz, A.A.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
Analysis, Observations, Marine sediments, Ocean bottom

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The deep structure of a sea floor hydrothermal deposit

Article Abstract:

The Bent Hill massive sulphide ore deposit lies beneath the northeast Pacific and is formed over the sediment-buried Juan de Fuca spreading centre. Leg 169 of the Ocean Drilling Program has drilled through the hydrothermal ore deposits to reveal that the mechanism of mineralization changes with depth, while the feeder cone of this huge sulphide deposit conceals a region of high-grade, copper-rich mineralization, not previously seen below sea-floor deposits.

Author: Miller, D.J., Guerin, G., Zierenberg, Robert A., Fouquet, Yves, Bahr, J.M., Baker, P.A., Bjerkgard, T., Brunner, C.A., Goodfellow, W.D., Groschel-Becker, H.M., Ishibashi, J., Iturrino, G., James, R.H., Lackschewitz, K.S., Marquez, L.L., Nehlig, P., Peter, J.M., Rigsby, C.A., Schultheiss, P., Shanks, W.C., III, Simoneit, B.R.T., Summit, M., Teagle, D.A.H., Urbat, M., Zuffa, G.G.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
Discovery and exploration, Sea-floor spreading, Hydrothermal deposits

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Atlantic lava lakes and hot vents

Article Abstract:

Submarine lava lakes on slow-spreading ridges may indicate the shallowest part of the magma chamber and its hottest domain, based on evidence from two lava lakes on the Mid-Atlantic Ridge. The lakes' proximity to the Lucky Strike hydrothermal vent field further supports associating lava lakes with shallow axial magma chambers.

Author: Ondreas, H., Fouquet, Y., Charlou, J.-L., Donval, J.-P., Radford=Knoery, J., Lourenco, N., Costa, I., Tivey, M.K.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
Lava, Mid-Atlantic Ridge

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Subjects list: Hydrothermal vents, United States. National Science Foundation. Ocean Drilling Program, Research
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