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By L. M. Parson, C. L. Walker, D. R. Dixon
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Extra info for Hydrothermal Vents and Processes (Geological Society Special Publication No. 87)
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Its weathered sulphide apron has shimmering water escaping from between blocks. The sides of the mound are steep to vertical in places and also have shimmering water escaping from cracks. 5-1 m thick, have rounded anhydrite encrusted bases. They jut out of the near-vertical wall of the mound at 5, 15 and 25 m above the surrounding seafloor. One flange has active sulphide chimneys on top venting black fluid and an anhydrite crust on its lower surface. The top of the Saracen's Head mound is rounded with a diameter of about 5m.
Geological setting and ecology of the Broken Spur hydrothermal vent field: 29~ on the Mid-Atlantic Ridge BRAMLEY J. M U R T O N 1, C I N D Y V A N D O V E R 2 & EVE SOUTHWARD 3 1Institute of Oceanographic Sciences, Wormley, Surrey GU8 5UB, UK 2Woods Hole Oceanographic Institute, MA 02543, USA 3Marine Biological Association, Citadel Hill, Plymouth PL1 2PB, UK Abstract: Deep-towed sidescan sonar and manned submersible studies have shown that hydrothermal activity within the Broken Spur vent field, located at 29~ on the Mid-Atlantic Ridge, is controlled by a combination of recent volcanic and tectonic activity.
PETERSON,M. N. A. 1966. Precipitates from hydrothermal exhalations on the East Pacific Rise. Economic Geology, 61, 1258-1265. , APPmOV, P. & JEAN-BAzrISTE,P. 1993. L'hydrothermalisme oceanique. Societd Geologique de France Memoir, 163, 99-112. CANN, J. R. & STRENS, M. R. 1982. Black smokers fuelled by freezing magma. Nature, 298,147-149. CnERrASHEV, G. 1990. [Metalliferous sediments from sites of oceanic sulfide formation (example of the northern East Pacific Rise)]. PhD Thesis, VNIIOceangeologija, Leningrad [in Russian].