scholarly journals "Mineralogical & Petrographic Microfacies Study of the Zahraa formation (Pliocene– Pleistocene) in Sawa Lake Surrounding area- IRAQ "

2017 ◽  
Vol 4 (1) ◽  
pp. 11-20
Author(s):  
Saleh A. Lazam
Keyword(s):  
Organic Matter ◽  
Fresh Water ◽  
Depositional Environment ◽  
Water Environment ◽  
Lake Area ◽  
Surrounding Area ◽  
Thin Sections ◽  
Project Area ◽  
Mineralogical Study ◽  
Fresh Water Environment

"Mineralogical, Petorographic Microfacies study has been done on (16) samples of Zahraa formation (Pliocene – Pleistocene) of outcrop in Surrounded Sawa Lake area. The mineralogical study showed that Calcite is the main mineral within the rock formation, whereas the upper rocks of Zahraa Formation consist silty or sandy claystone is dominant in the middle and the upper portion, in addition to quartz, clay minerals, iron oxide and organic matter as insoluble residues. From thin sections study, Three main microfacies have been identified which are: Charophyte shelly bioclastic wackestone, Charophyte shelly bioclastic dolowackestone and Algal wackestone. Based on microfacies study and its fossils content, it has been possible to determine the depositional environment of Zahraa Formation which deposits in the area of the presence of Charaphytes, indicates fresh water environment. From the depositioal situation and the large extension in the project area, the type of fresh water environment is ephemeral freshen water lakes."

scholarly journals Drmno lignite field (Kostolac basin, Serbia): Origin and palaeoenvironmental implications from petrological and organic geochemical studies

2012 ◽  
Vol 77 (8) ◽  
pp. 1109-1127 ◽  
Author(s):  
Ksenija Stojanovic ◽  
Dragana Zivotic ◽  
Aleksandra Sajnovic ◽  
Olga Cvetkovic ◽  
Peter Nytoft ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Level ◽  
Microbial Activity ◽  
Fresh Water ◽  
Water Environment ◽  
Thermal Alteration ◽  
Geological Evolution ◽  
Geochemical Analyses ◽  
Geochemical Studies ◽  
Fresh Water Environment

The objective of the study was to determine the origin and to reconstruct the geological evolution of lignites from the Drmno field (Kostolac Basin, Serbia). For this purpose petrological and organic geochemical analyses were used. Coal from the Drmno field is typical humic coal. Peat-forming vegetation dominated by decay of resistant gymnosperm (coniferous) plants, followed by prokaryotic organisms and angiosperms. Coal forming plants belonged to the gymnosperm families Taxodiaceae, Podocarpaceae, Cupressaceae, Araucariaceae, Phyllocladaceae and Pinaceae. Peatification was performed in neutral to slightly acidic, fresh water environment. Considering that organic matter of Drmno lignites was deposited at the same time, in the relatively constant climate, it could be supposed that climate probably had only small impact on peatification. Therefore, variations in compositions of macerals and biomarkers indicate changes in the water level, due to seasonal drying of the mire, which caused vegetation differences in the palaeoplant communities and changes of redox conditions (from anoxic to slightly oxic) during peatification. Diagenetic transformations of the organic matter were mainly governed by microbial activity, rather than thermal alteration.

scholarly journals Ceriodaphnia dubia as a Potential Bio-Indicator for Assessing Acute Aluminum Oxide Nanoparticle Toxicity in Fresh Water Environment

PLoS ONE ◽  
2013 ◽  
Vol 8 (9) ◽  
pp. e74003 ◽  
Author(s):  
Sunandan Pakrashi ◽  
Swayamprava Dalai ◽  
Ahmed Humayun ◽  
Sujay Chakravarty ◽  
Natarajan Chandrasekaran ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Fresh Water ◽  
Water Environment ◽  
Ceriodaphnia Dubia ◽  
Nanoparticle Toxicity ◽  
Oxide Nanoparticle ◽  
Fresh Water Environment

scholarly journals Biodiesel Potentials of Microalgal Strains Isolated from Fresh Water Environment

2021 ◽  
pp. 100367
Author(s):  
Seun Oyelami ◽  
Nurudeen A. Azeez ◽  
Abideen A. Adekanmi ◽  
Opeyemi B. Ologunye ◽  
Sulaiman A. Adedigba ◽  
...  
Keyword(s):  
Fresh Water ◽  
Water Environment ◽  
Fresh Water Environment

Application of mathematical tools and techniques in monitoring and predicting stainless steel corrosion in river water media environment

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Weight Loss ◽  
Stainless Steel ◽  
Corrosion Rate ◽  
Fresh Water ◽  
Salt Water ◽  
Aqueous Media ◽  
Water Environment ◽  
Quadratic Model ◽  
Tools And Techniques ◽  
Fresh Water Environment

The application of mathematical tools and techniques were applied in the process of monitoring and predicting the corrosion rate and weight loss of stainless steel in salt and fresh water environment of Niger Delta region in Nigeria. The functional parameters used in the mathematical demonstration to compute the corrosion rate and weight loss were obtained from the experimental data and these functional coefficients were fitted into the power and quadratic model. The experimental corrosion rate and weight loss value was compared with the theoretical computed value for both model of quadratic and power concept approach and the result obtained demonstrate a good match indicating the reliability of the concepts on monitoring and predicting the process. In this case, the corrosion rate and weight loss was experienced to be more rapid in the salt water environment than the fresh water environment; this can be attributed to the characteristics of the salt water concentration of the physicochemical parameters that is a major contributing factor for increase in corrosion rate and weight of metals in aqueous media.

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