نتایج جستجو برای: sediment core
تعداد نتایج: 250295 فیلتر نتایج به سال:
Seasonal variation in trace metal contamination in surface sediments was studied through high resolution profiles assessed monthly by DGT probes in muddy sediments of the North Sea. General parameters such as pH, temperature, dissolved oxygen and sulfides were also recorded to estimate their role in the speciation of trace metals. Experimental data were included in a thermodynamic equilibrium m...
Mars was most active during its first billion years. The core, mantle, and crust formed within approximately 50 million years of solar system formation. A magnetic dynamo in a convecting fluid core magnetized the crust, and the global field shielded a more massive early atmosphere against solar wind stripping. The Tharsis province became a focus for volcanism, deformation, and outgassing of wat...
A sediment sample was obtained at 122 cm from the top of a drilling core in the Guapimirim mangrove, Bay of Guanabara, and analyzed using pollen analysis. This muddy core reached a sandy ground at 133 cm. 14C datation got the age of 1760 +/- 50 years B.P. The most frequent pollen grains were mangrove species of Rhizophora mangle, Laguncularia racemosa and Avicennia schaueriana. "Restinga" and t...
Hyperspectral imaging is a recent technology that has been gaining popularity in the geosciences since 1990s, both remote sensing and field or laboratory. Indeed, it allows rapid acquisition of large amount data are spatialized on studied object with low-cost, compact, automatable sensor. This practical article aims to present current state knowledge use hyperspectral for sediment core analysis...
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