Организация и проведение специальной оценки условий труда на предприятии

Актуальность статьи связана с охраной труда и здоровья людей в Российской Федерации как социальном государстве.The relevance of the article is related to the labor protection and health of people in the Russian Federation as a social state

Cyclic anoxia and organic rich carbonate sediments within a drowned carbonate platform linked to Antarctic ice volume changes: Late Oligocene-early Miocene Maldives

This paper reports on the newly discovered occurrence of thick sequences (∼100 m) of Late Oligocene and Early Miocene (∼24.9 to ∼20 Ma) interbedded organic-rich sediments (sapropels) and pelagic (organic poor) carbonates at Sites U1466 and U1468 drilled in the Maldives archipelago during the International Ocean Discovery Program (IODP) Expedition 359. This occurrence is unusual in that this sequence is located > 1000 m above the surrounding ocean floor within an inter-atoll basin and not linked to any known global oceanic events. Total organic content reaches as high as 35% in the darker layers, while the interbedded carbonates have concentrations of less than 0.1%. Trace elements characteristic of anoxic waters, such as Mo, V, Cr, U, and Pb, correlate positively with concentrations of organic carbon. Nitrogen isotopic data show no evidence that the intervals of high total organic carbon are related to enhanced productivity driven by upwelling. Instead, high organic carbon is associated with intervals of anoxia. We propose that sea-level fluctuations linked to changes in Antarctic ice volume restricted exchange with the open ocean causing bottom waters of the inter-atoll basin to become anoxic periodically. The architecture of the platform at the end of the Oligocene, combined with the global sea-level highstand, set the stage for orbitally-driven sea-level changes producing cyclic deposition of sapropels. The proposed mechanism may serve as an analogue for other occurrences of organic carbon-rich sediments within carbonate platform settings.</p

Benthic Disturbance And Monitoring Experiment In The Central Indian Ocean Basin

Environmental impact assessment studies for deep sea manganese nodule mining have been initiated in the Central Indian Ocean Basin since 1995. As a part of the first phase for collecting the benthic baseline data, echo sounding, sub-bottom profiling, seabed photography, coring and sampling have been carried out at close intervals in 5 selected areas (of 10x10 miles each). Detailed studies on topographic undulations, nodule distributions and sediment characteristics have resulted in the selection of Test and Reference Areas. A strip of 3000 200 m was disturbed with a hydraulic device, so as to cause suspension and redistribution of sediment in the near bottom waters and the impact on the seabed as well as dose to the bottom was observed. Results show that most of the disturbance is restricted to the disturbed area with some resedimentation in adjacent areas, whereas no significant mention of sediment in the bottom waters is observed. A longterm monitoring of the environmental Impact of the Benthic Disturbance has been planned in the study areas

Nature, distribution &amp; origin of clay minerals in grain size fractions of sediments from manganese nodule field, Central Indian Ocean Basin

DT, IR and X-ray diffraction &lt; 1,1 -2 and 2-4 /&#956;m) of sediments from the Central Indian Ocean Basin. Results indicate that there are 2 smectite minerals (montmorillonite and Fe-rich montmorillonite). Montmorillonite is present in all size fractions of sediments, whereas Fe-rich montmorillonite is present onlyin &lt; 1 and 1-2 &#956;m fractions of siliceous and &lt; l&#956;m fractions of pelagic clays. Distribution of clay minerals suggests that illite, chlorite and kaolmite are the detrital products from Ganges and Brahmaputra and montmorillonite is derived from the weathering of the ridge rocks.Fe-rich montmorillonite in siliceous and pelagic clays is a result of early diagenetic processes. Size fraction studies suggest that montmorillonite tends to crystallise in &lt;2&#956;m size range