منابع مشابه
Mercury Profiles in Sediments of the Arctic Ocean Basins
Total Hg distributions have been measured for seven sediment cores collected from the major basins of the Arctic Ocean during the Arctic Ocean Section in 1994. Hg determinations were perfomed on the top 10 cm of the sectioned cores using gold amalgamation atomic fluorescence spectroscopy. In five cores, Hg concentrations decrease downward from 34 to 116 ng g-1 at the sediment surface to 10-65 n...
متن کاملOcean Basins and the Biogeography of Freshwater Fishes
Geological evolution of the Indian and Pacific Ocean basins, including the Tethys Sea, is relevant to the evolution and distribution of Indo-Pacific freshwater fishes. Area cladograms derived from phylogenetic analyses of atherinomorph fishes are compared, in part, with those for plant bugs, cicadas and bats. Geologically and biologically composite islands in the Indo-Australian archipelago suc...
متن کاملMicrobial Ecology of Mid-Ocean Ridges and Back-Arc Basins
Over the past two decades, microbiologists have gained significant insights into the diversity and physiology of microbial communities associated with deep-sea hydrothermal systems. Much of the initial research focused on mid-ocean ridge (MOR) systems; however, because of the greater heterogeneity of vent fluid chemistry and sulfide structures from back-arc basin (BAB) systems, recent studies h...
متن کاملDiversity and activity of nitrogen-fixing communities across ocean basins
Recent observations of N2 fixation rates (NFR) and the presence of nitrogenase (nifH) genes from heterotrophic N2-fixing (diazotrophic) prokaryotes in unusual habitats challenge the paradigm that pelagic marine N2 fixation is constrained to cyanobacteria in warm, oligotrophic, surface waters. Here, we compare NFR and diazotrophic diversity (assessed via high-throughput nifH sequencing) from a r...
متن کاملIs Ambient Noise Tomography Across Ocean Basins Possible?
[1] Based on year-long cross-correlations of broad-band seismic records obtained at sixty-six stations within or adjacent to the Pacific Basin, we show that broad-band ambient noise is observed to propagate coherently between island stations and between island and continent stations. For many station pairs, high signal-to-noise ratio (SNR) fundamental mode Rayleigh wave Green functions are obse...
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ژورنال
عنوان ژورنال: Geological Magazine
سال: 1884
ISSN: 0016-7568,1469-5081
DOI: 10.1017/s0016756800185772