Phytoassessment of in situ weed diversity for their chromium distribution pattern and accumulation indices of abundant weeds at South Kaliapani chromite mining area with their phytoremediation prospective

The geological extreme Dallol region, located around the Dallol volcano in the north-east of Danakil depression (Ethiopia), is considered as one of the harshest and hottest places on Earth. The geology is made up of years and years of evaporates accumulation. Volcanic activity generates ascending brines that may cross and mix with aquifers from inflowing meteoric water originating from the Ethiopian highlands on the east of the Danakil depression. When these mixtures reach the surface they can generate hydrothermal springs giving rise to waterbodies in the form of small ponds or lakes. During the Europlanet 2018 Danakil field expedition, ten of these saline waterbodies were extensively studied by in situ measurements and ex situ geo&#8211;physico-chemical and &#8211;microbiological analyses of collected samples, liquids as well as sediments.The in situ physico-chemical measurements clearly indicated the extreme nature of all ten investigated lakes. Laboratory analyses of the collected batch samples of liquids and sediments confirmed the extreme character of the waterbodies and complements our geological survey of the region with valuable geo&#8211;chemical and &#8211;microbiological data.Based on our analytical results, the relative small Dallol region can still be subdivided into three geological smaller areas: the outcrop zone, the volcanic base region and the distant south area. The outcrop zone is dominated by sodium, iron and potassium. Oxidation processes in the outflowing superheated ferrous and sulfidic rich brine give rise to some of the most acidic ponds on our planet. In the ponds and lakes of the volcanic base region, incredible high amounts of calcium and/or magnesium can remain in their dissolved form as the most dominant and quasi only available anion is chloride. This region is host for the most saline water body on Earth. Chemical analysis of the lakes of the distant south area show that sodium is by far the most dominant cation. It is therefore no surprise that the large Karum Lake in the south region is economically exploited for the mining of sodium chloride.Our mineralogy analyses render results that are completely in line with the observed geochemistry of the waterbodies. Halite and sylvite are the most present minerals in the Dallol outcrop zone associated with some gypsum and in one case with anhydrite. The geology around the waterbodies of volcanic base zone are a little bit more divers. On the shores of the Gaet&#8217;ale Pond tachyhydrite, chloromagnesite, halite and sylvite is determined, while the Black Lake is surrounded by bischofite and carnalite. Logically, the mineralogy of the south area, the salt mining area, is dominated by halite and sylvite.Apparently, the geochemistry of the outcrop zone and volcanic base region is so harsh that no extremophilic organism is able to survive in these areas. Only in the distant south area did we find indications of the presence of halophiles. Besides the bacterial genus Salinibacter, our 16S rDNA microbiological fingerprinting indicates the presence of halophilic archaea like:&#160; Halobaculum sp., Halobellus sp., Halomicroarcula sp., Halorientalis sp. with the majority of the population being Candidatus Nanosalina sp.

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Analysis of Fault Strike Based on Multi-point In-situ Stress Data in Jinchuan Mining Area

Proceedings of the 4th World Congress on Civil, Structural, and Environmental Engineering ◽

10.11159/icgre19.117 ◽

2019 ◽

Author(s):

Yiteng Wang ◽

Chuanying Wang ◽

Zengqiang Han ◽

Yuqun Huang

Keyword(s):

Mining Area ◽

In Situ Stress

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Surface Water and Groundwater Quality Evaluation in a Mining Area

Revista de Chimie ◽

10.37358/rc.20.6.8177 ◽

2020 ◽

Vol 71 (6) ◽

pp. 124-131

Author(s):

Alina Cochiorca ◽

Valentin Nedeff ◽

Narcis Barsan ◽

Ion Sandu ◽

Emilian Mosnegutu ◽

...

Keyword(s):

Surface Water ◽

Dissolved Oxygen ◽

Mining Area ◽

Chemical Parameters ◽

Chemical Indicators ◽

Surface Water And Groundwater ◽

Physico Chemical ◽

Three Rivers

This paper presents a monitoring of groundwater and surface water in the mining area Tg. Ocna, by analyzing 16 physico-chemical parameters (pH, turbidity, dissolved oxygen, Pb, Ni, Cu, Fe, Mn, Zn, Cr, Mg, SO42-, Al, NO2-, NO3-, NH4+), from three rivers Slanic, Trotus and Valcele, a small lake Groapa Burlacu, a fountain and three monitoring drilling wells (F11, F16 and F17). Studies on the quality of surface water and groundwater in areas near mines are important due to extraction and exploitation of salt. The samples were collected in April 2019. Following the analyzes, their results are included in the following concentration ranges: pH 7.21 to 8.46 unit. pH, turbidity 0.54 to 169 NTU, dissolved oxygen 6 to 8.59 mg/L, Pb 0.075 to 0.095 mg/L, Ni 0.026 to 1.05 mg/L, Cu 0.088 to 0.809 mg/L, NO2- 0.001 to 0.037 mg/L and NO3- 0.290 to 4.34 mg/L. The pH, turbidity and dissolved oxygen were measured in situ using portable equipment�s. As for the other parameters, they were analyzed in the water laboratory from Vasile Alecsandri University of Bacau by using spectrophotometry. Some concentrations of the physico-chemical indicators of the water samples analyzed were found to be more than the water quality classes.

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Organically bound halogens in coniferous forest soil -Distribution pattern and evidence of in situ production

Chemosphere ◽

10.1016/0045-6535(95)00107-j ◽

1995 ◽

Vol 30 (12) ◽

pp. 2353-2364 ◽

Cited By ~ 35

Author(s):

Olof Hjelm ◽

Maj-Britt Johansson ◽

Gunilla Öberg-Asolund

Keyword(s):

Distribution Pattern ◽

Forest Soil ◽

Coniferous Forest ◽

Soil Distribution ◽

In Situ Production

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Characteristics of in situ stress field in the Huainan mining area, China and its control factors

10.21203/rs.3.rs-260973/v1 ◽

2021 ◽

Author(s):

Xiuchang Shi ◽

Jixing Zhang ◽

Guoqing Li

Keyword(s):

Principal Stress ◽

Mining Area ◽

Maximum Principal Stress ◽

Geological Structure ◽

In Situ Stress ◽

Burial Depth ◽

Principal Stresses ◽

Support Design ◽

Control Factors

Abstract Due to the high in situ stresses, dynamic disasters occurred frequently in the Huainan mining area, China. While our understanding of the in situ stresses in this area is still insufficient. In this study, the in situ stresses of 18 sections in two boreholes in the Xinji No. 1 coalfield were measured by using hydraulic fracturing method, and the distribution of in situ stresses in the Huainan mining area were investigated. The relationship between in situ stress and geological structure in the Huainan mining area were summarized and the limitation of fault friction strength on in situ stresses were discussed. The result showed that the maximum horizontal principal stress (σH) at Xinji No. 1 mine was 13.95–25.23 MPa, the minimum horizontal principal stress (σh) was 12.16–21.17 MPa. The average azimuth of the maximum horizontal principal stress was N83.61 °E. The statistical results showed that the in situ stresses in Huainan mining area were characterized by a strike-slip faulting regime. Both the horizontal and vertical principal stresses increased approximately linearly with the increase of burial depth. The direction of the maximum principal stress in the study area is closely related to the tectonic movement and the ratio of maximum principal stress to minimum principal stress was primarily limited by the friction strength of fault. The outcomes of this research can provide some reliable engineering parameters and benefit the roadway layout and support design in the Huainan mining area.

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The nature and origin of nodules in Podzolic soils from Alberta

Canadian Journal of Soil Science ◽

10.4141/cjss91-041 ◽

1991 ◽

Vol 71 (4) ◽

pp. 411-426 ◽

Cited By ~ 11

Author(s):

J. M. Arocena ◽

S. Pawluk

Keyword(s):

Organic Matter ◽

Distribution Pattern ◽

Building Blocks ◽

In Situ Xrd ◽

Podzolic Soils ◽

Physical Chemical ◽

Forest Region ◽

Related Distribution ◽

Fungal Hyphae

A common pedological feature in Podzols and Podzolic-like soils in the forest region of Hinton, Alberta is the presence of nodules in the Bf horizons with diameters of 1—20 cm. The nature of these nodules was investigated through physical, chemical, mineralogical and micromorphological examinations. Results showed that the nodule microstructure is mainly bridged-grain type compared to dominantly pellicular type for the soil matrixes. The basic building blocks are (a) coarse components (> 5 μm): quartz, feldspars mainly albite, pseudo sands, sand-sized chlorites and small quantities of anthophyllite, sillimanite, andalusite and lithogenic hematite; (b) fine components (< μm): phyllosilicates (mainly hydroxy interlayered vermiculite, kaolinite, vermiculite, and small amounts of chlorite), quartz and organic matter. Imogolite is present in the very fine clays. The similarity in the mineral suites and the porphyric related distribution pattern between the Bf horizons and the nodules indicate an authigenic origin for the nodules through an eluviation/illuviation process. Fungal hyphae provide a framework for nodule aggregation. In situ XRD determinations revealed that sand-sized Fe concretions are goethite alone or in association with hematite. The omnipresence of quartz in infillings, coatings and opaque coarse components was also evident. Key words: Micromorphology, related distribution pattern, in situ mineral determination

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