The Mid-Atlantic Ridge at 37 and 45� N: some geophysical and petrological constraints
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چکیده
منابع مشابه
Shear wave splitting and crustal anisotropy at the Mid-Atlantic Ridge, 35 N
[1] Shear wave splitting observed in microearthquake data at the axis of the Mid-Atlantic Ridge near 35 N has a fast polarization direction that is parallel to the trend of the axial valley. The time delays between fast and slow S wave arrivals range from 35 to 180 ms, with an average of 90 ms, and show no relationship with ray path length, source-toreceiver azimuth, or receiver location. The a...
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Microbial community structure in natural environments has remained largely unexplored yet is generally considered to be complex. It is shown here that in a Mid-Atlantic Ridge hydrothermal vent habitat, where food webs depend on prokaryotic primary production, the surface microbial community consists largely of only one bacterial phylogenetic type (phylotype) as indicated by the dominance ofa si...
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1 The authors gratefully acknowledge the support of the National Science Foundation under Grant number OCE-9505579 and OCE-9627160. The authors were members of the engineering and scientific staff of the 1996 Lucky Strike Cruise. Humphris and Fornari were the cruise chief scientists, and are with the WHOI Department of Geology and Geophysics. Van Dover is with the the West Coast National Unders...
متن کاملDynamics of mantle flow and melting at a ridge-centered hotspot: Iceland and the Mid-Atlantic Ridge
The dynamics of mantle flow and melting of a ridge-centered plume were investigated with three-dimensional variable-viscosity numerical models, focusing on three buoyancy sources: temperature, melt depletion, and melt retention. The width, W, to which a plume spreads along a ridge axis, depends on plume volume flux, Q, full spreading rate, U, buoyancy number, B, and ambientrplume viscosity cont...
متن کاملBacterial diversity in hydrothermal sediment and epsilonproteobacterial dominance in experimental microcolonizers at the Mid-Atlantic Ridge.
We report here a molecular survey based on 16S rRNA genes of the bacterial diversity found in two deep-sea vent niches at the Mid-Atlantic Ridge: hydrothermal sediment (Rainbow site), and microcolonizers made of three different substrates (organic-rich, iron-rich and pumice) that were exposed for 15 days to a vent emission. Bacterial diversity in sediment samples was scattered through many bact...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1978
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.1978.tb05499.x