Earth Science Research最新文献_第6页

Mineralogical, Chemical, Geotechnical and Mechanical Investigations of Bafang Lateritic Fine Soils Formed on Basalts (West-Cameroon) for Road Embankment Purpose 巴方玄武岩(喀麦隆西部)筑路用红土细土的矿物学、化学、岩土和力学研究

Earth Science Research Pub Date : 2018-05-04 DOI: 10.5539/ESR.V7N2P42

W. T. Hyoumbi, P. Pizette, A. Wouatong, N. Abriak

{"title":"Mineralogical, Chemical, Geotechnical and Mechanical Investigations of Bafang Lateritic Fine Soils Formed on Basalts (West-Cameroon) for Road Embankment Purpose","authors":"W. T. Hyoumbi, P. Pizette, A. Wouatong, N. Abriak","doi":"10.5539/ESR.V7N2P42","DOIUrl":"https://doi.org/10.5539/ESR.V7N2P42","url":null,"abstract":"The present paper treats the relationship between geotechnical parameters and the mineralogical compositions, in order to understand the behavior of the Bafang lateritic fine soils and their efficient use as road embankment materials on the other hand. Thus, the field campaigns have permitted to distinguish two facies of Bafang lateritic fine soils: reddish and yellowish facies. The X-ray diffraction (XRD), the thermo-gravimetry analysis (TGA) and the X-ray fluorescence (XRF) have revealed that the reddish facies contents: kaolinite (53.34% -48.29%); hematite (16.62% - 17.40 %); gibbsite (8.26 % - 16.54%), ilmenite (7.6 % -7.98%), quartz (1.92 % - 4.65 %), illite (2.65% - 1.99 %) and accessories minerals as florencite (1.45%); montmorillonite (0.90 %) and plagioclase (0.69 %); while the yellowish facies is composed of : 65.1 % kaolinite, 11.2 % gibbsite, 9.64 % goethite, 7.02 % quartz, 3.23 % ilmenite and 2.08 % of illite. Their Silica/sexquioxide ratios correspond to those of moderate laterite. The geotechnical and mechanical characteristics have shown that the reddish and yellowish facies are respectively silty clay and sandy silt. They are plastic to very high plastic and moderately clayey to clayey materials. Moreover, they are medium swelling to high swelling. The IBR values more than 40% and the soaked CBR values prove that these materials belong to the S4 bearing capacity class. The minimum values of UCS and Rt are respectively 1.7 MPa and 0.17 MPa. Then, the results of geotechnical and mechanical properties combining to those of XRD, TGA and XRF have demonstrated that the fine lateritic soils with low silica/sexquioxide ratios values (less than 1.6) are suitable for road embankment.","PeriodicalId":11486,"journal":{"name":"Earth Science Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88806449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Optimization of Phosphogypsum By-Production Using Orthophosphoric Acid as Leaching Solvent with DifferentTemperatures and Leaching Time Periods 以正磷酸为浸出溶剂，不同温度和浸出时间的磷石膏副产优化

Earth Science Research Pub Date : 2018-05-03 DOI: 10.5539/ESR.V7N2P28

M. Abdelhadi, N. Abdelhadi, T. El-Hasan

{"title":"Optimization of Phosphogypsum By-Production Using Orthophosphoric Acid as Leaching Solvent with DifferentTemperatures and Leaching Time Periods","authors":"M. Abdelhadi, N. Abdelhadi, T. El-Hasan","doi":"10.5539/ESR.V7N2P28","DOIUrl":"https://doi.org/10.5539/ESR.V7N2P28","url":null,"abstract":"Phosphoric acid production generates unavoidable calcium sulfate by product (i.e. phosphogypsum (PG)) that is usually disposed either within a nearby located gypsum stacking system. However nowadays this type of industry has been faced with two main problems; these are the formation of huge stockpiles of phosphogypsum that affects the environment due to the presence of harmful radiations that is emitted from the uranium. In addition it contains P2O5>1.0 wt% and fluorine >0.18 wt%, which makes it not suitable for the cement industry. At the same time consuming large quantity of expensive sulphuric acid that becomes a hazardous waste material too. The production ratio of PG verses marketable P2O5 as acid in the world is high as much as 5 tons of PG are produced for each ton of P2O5; in Jordan the ratio is around 5.0 – 5.3 ton of PG / ton of P2O5 produced depending on the phosphate rock composition, which means a huge amount of PG will accumulate at the Fertilizer plant in Aqaba. The major advantages of using orthophosphoric acid as leaching solvent is the decreasing ratio of the residual materials verses marketable P2O5to be589 kg /ton of P2O5 produced. These results were obtained by utilizing the wet agitation leaching technique, compared with 5.0 – 5.3 ton of disposed PG/ton of P2O5produced by Jordan Phosphate Mines Company Ltd., (JPMC). However, this alternative technique resulted in lowerP2O5 extraction, but decrease in bulk of the residue. The disadvantage is the higher dissolution of calcium phosphate and thus considerable calcium well remain in solution.","PeriodicalId":11486,"journal":{"name":"Earth Science Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79590065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Global Warming is an Energy Conundrum 全球变暖是一个能源难题

Earth Science Research Pub Date : 2018-03-15 DOI: 10.5539/ESR.V7N2P1

J. Lane

引用次数: 3

Mineralogical, Geochemical and Distribution Study of Bauxites in the Locality of Bangam and Environs (West Cameroon) 喀麦隆西部邦甘及其周边地区铝土矿的矿物学、地球化学及分布研究

Earth Science Research Pub Date : 2018-01-24 DOI: 10.5539/esr.v7n1p117

Taylor Moise Sojien, Estelle Lionelle Tamto Mamdem, A. Wouatong, D. Bitom

{"title":"Mineralogical, Geochemical and Distribution Study of Bauxites in the Locality of Bangam and Environs (West Cameroon)","authors":"Taylor Moise Sojien, Estelle Lionelle Tamto Mamdem, A. Wouatong, D. Bitom","doi":"10.5539/esr.v7n1p117","DOIUrl":"https://doi.org/10.5539/esr.v7n1p117","url":null,"abstract":"The bauxite duricrust in the Bangam and surroundings is classified into three major storey levels as follows: the upper level on top of the plateaus where the continuous bauxites outcrop in slabs over distances of about 1 km, the intermediate level on top and at the flanks of the hills where the bauxites flush in metric blocks, the lower level at the talwegs where bauxites duricrust are gravels. The average thickness of the duricrust is 9.6m and extends over an area of about 9.5km 2 . Five types of facies are encountered here: nodular, pisolitic, pseudobreccia, vacuolar and massive. These different facies were carried out by X-ray fluorescence spectrometry, X-ray diffractometric, thermal analysis (ATD / ATG) and by polarizing microscope observation. The results of these analyses show that, gibbsite is the dominant mineral; kaolinite, anatase, hematite, goethite, magnetite and ilmenite are also present. The chemical composition of the major elements that characterize bauxites are 38-60% Al 2 O 3 ; 2 -22% SiO 2 and 9-42% Fe 2 O 3 . These values are almost similar to those obtained in Doumbouo-Fokoue, Ghana, Ngaoundal, and Minim-Martap precisely at Briskok prospect. The different minerals paragenesis and geochemistry data show that, the Bangam locality is a bauxite ore deposit in spite of a high content of iron and silicate of some facies, nevertheless, these can be used in some industries.","PeriodicalId":11486,"journal":{"name":"Earth Science Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90689775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Possible Influence of Solar Activity on Global Volcanicity 太阳活动对全球火山活动的可能影响

Earth Science Research Pub Date : 2018-01-23 DOI: 10.5539/ESR.V7N1P110

Lihua Ma, Z. Yin, Yan-ben Han

引用次数: 2

Quasi ~500-year Cycle Signals in Solar Activity 太阳活动的准~500年周期信号

Earth Science Research Pub Date : 2018-01-23 DOI: 10.5539/ESR.V7N1P131

Lihua Ma, Z. Yin, Yan-ben Han

引用次数: 1

A Novel Model for Predicting Sun Outage in Satellite Communication 卫星通信中太阳中断预测的新模型

Earth Science Research Pub Date : 2018-01-17 DOI: 10.5539/ESR.V7N1P106

Lihua Ma, Chao Hu, Jun Pei, Xinghua Ma, Yan-ben Han

引用次数: 3

Geometrical Characterisation of the Mamfe Basin, Cameroon, from the Earth, Gravitational Model (EGM 2008) 喀麦隆Mamfe盆地的几何特征，来自地球引力模型(EGM 2008)

Earth Science Research Pub Date : 2018-01-13 DOI: 10.5539/ESR.V7N1P94

A. D. Lordon, M. Yossa, C. M. Agyingi, Yves Shandini, Thierry Stephane kuisseu

{"title":"Geometrical Characterisation of the Mamfe Basin, Cameroon, from the Earth, Gravitational Model (EGM 2008)","authors":"A. D. Lordon, M. Yossa, C. M. Agyingi, Yves Shandini, Thierry Stephane kuisseu","doi":"10.5539/ESR.V7N1P94","DOIUrl":"https://doi.org/10.5539/ESR.V7N1P94","url":null,"abstract":"Gravimetric studies using the ETOPO1-corrected high resolution satellite-based EGM2008 gravity data was used to define the surface extent, depth to basement and shape of the Mamfe basin. The Bouguer anomaly map was produced in Surfer 11.0. The Fast Fourier Transformed data was analyzed by spectral analysis to remove the effect of the regional bodies in the study area. The residual anomaly map obtained was compared with the known geology of the study area, and this showed that the gravity highs correspond to the metamorphic and igneous rocks while the gravity lows match with Cretaceous sediments. Three profiles were drawn on the residual anomaly map along which 2D models of the Mamfe basin were drawn. The modeling was completed in Grav2dc v2.06 software which uses the Talwini’s algorithm and the resulting models gave the depth to basement and the shape of the basement along the profiles. After processing and interpretation, it was deduced that the Mamfe basin has an average length and width of 77.6 km and 29.2 km respectively, an average depth to basement of 5 km and an overall U-shape basement. These dimensions (especially the depth) theoretically create the depth and temperature conditions for petroleum generation.","PeriodicalId":11486,"journal":{"name":"Earth Science Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84520850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Artificial Recharge Flux to Nubian Aquifer System in Tushka, Egypt 埃及图什卡努比亚含水层系统的人工补给通量

Earth Science Research Pub Date : 2017-12-31 DOI: 10.18005/JESR0501001

Mustafa Elkhedr, H. Abu-Bakr, T. Hassan

引用次数: 1

A GIS-based USLE Model to Estimate Soil Loss Potential of Arid Lands of Southern Iran 基于gis的USLE模型估算伊朗南部干旱区土壤流失潜力

Earth Science Research Pub Date : 2017-12-31 DOI: 10.18005/JESR0501003

H. Ahani, S. R. F. Shamsi, M. Baghernejad

引用次数: 0