Sediments deep ocean environments

Dating Recent (200 Years) Events in Sediments from Lakes, Estuaries, and Deep Ocean Environments Using Lead-210... 

Figure 2 Jurassic stages, zones, and subzones recognized using OppeTs methods using stratigraphic ranges of ammonite species. Synchroneity between ammonite-hearing rocks that accumulated in shelf environments and sediments that accumulated in deep-ocean settings is also shown. Zones are based on dinoflageUates and...

Deep ocean sediments are proving to be a valuable source of new actinomycete bacteria that are unique to the marine environment, and based on a combination of culture and phylogenetic approaches, the first truly marine actinomycete genus named Salinospora has been described. Members of the genus are ubiquitous, and are found in sediments on tropical ocean bottoms and in more shallow waters, often reaching concentrations up to l(f per cc of sediment, as well as appearing on the surfaces of numerous... 

Hydrothermal and mantle contributions of methane are not significant. Oceanic surface waters are oversaturated with respect to methane, due to bacterial (methanogenic) activity in localized anaerobic environments, such as the digestive tracts of zooplankton, resulting in a net flux of methane to the air. Methane is similarly produced in freshwater environments. Deep ocean waters contain much lower methane concentrations than surface waters and the methane generated within anaerobic sediments is mostly oxidized by methanotrophes. Marine and lacustrine environments as a whole do not make a large contribution to the methane flux, but natural wetlands do. The bacterial... 

The third example recorded in the Weddell Sea/ Antarctic Ocean during RV Polarstem cmise ANT Xl/4 as well (Kuhn, pers. communication) indicates a deep sea environment with clay sediments (Fig. 2.25c). Signal penetration again is high (about 140 m), and reflection horizons are very... 

Stein, R., 1986a. Surface-water paleo-productivity as inferred from sediment deposited in oxic and anoxic deep-water environments of the Mesozoic Atlantic Ocean. Mitt. Geol.-Palaont. Inst. Univ. Hamburg, 60 55-70. 

This section primarily focuses on the description of the deposition and accumulation of carbonates in shallow waters and in the deep ocean. The main depocenters for calcium carbonates are the continental shelf areas, as well as island arcs or atolls, which are the typical shallow water environments for massive carbonate formation, and the pelagic deep-sea sediments above the calcite compensation depth catching the rain of small calcareous tests formed by marine plankton in the surface waters. 

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