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Mineralogy and geochemistry of pozzolans from the Tombel Plain,Bamileke Plateau,and Noun Plain monogenetic volcanoes in the central part of the Cameroon Volcanic Line

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Acta Geochimica 2020年第6期39卷 830-861页

作者： Mbowou Ngantche Igor Fulbert Owona Sebastien Chako Tchamabe Boris Lissom Justin lanson bruno Ekodeck Georges Emmanuel Faculty of Science Department of Earth SciencesUniversity of DoualaP.O.Box 24157DoualaCameroon Faculty of Science Department of GeologyUniversity of Buea.P.O.Box 63BueaCameroon CONACYT-Centro de Ingenieria y Desarrollo Industrial(Sede Campeche) Av.Playa Pie de la Cuesta N°702Desarrollo San PabloP.O.Box.76125QueretaroMexico Institut des Sciences de la Terre(ISTerre) Maison des Sciences de la TerreP.O.Box 5338041 Grenoble Cedex 9France Faculty of Science Department of Earth SciencesUniversity of Yaounde IP.O.Box:812YaoundeCameroon

Pozzolans from the Tombel Plain,Bamileke Plateau,and Noun Plain,3 monogenetic volcanic fields in the central part of the Cameroon Volcanic Line(the Tombel Plain,Bamileke Plateau,and Noun Plain),were explored in order to constrain their petrology and make some predictions on their *** rocks in this study include alkaline and subalkaline basalts,trachybasalts,and *** of these rocks present an overall composition that overlaps with primitive mantle,suggesting rapid ascent of magmas,limited crustal contamination and crystal fractionation of olivine,clinopyroxene,and *** pozzolans present enrichment of LREE relative to HREE and high chondrite normalized ratios of La/Yb and Tb/*** between 7 and 20 and>1.9 respectively,similar to those of Ocean Island *** other nearby volcanoes,partial melting in a dominantly garnet-bearing mantle zone can be *** mineralogy by X-ray diffraction revealed various mineral phases with dominantly plagioclase,augite,olivine,and Fe-Ti *** samples contains important amorphous phase up to 23,51,and 69 wt%in the Tombel Plain,Noun Plain,and Bamileke Plateau,*** elevated amount of amorphous phases together with the sum of SiO2,Al2O3 and total Fe2O3(SAI=68.50-83.50>70 wt%)according to ASTM C618 standard and the sum of CaO,FeO,and MgO(CIM=14.5-30.52 wt%and 23.58-31.08 wt%)suggest interesting pozzolanicity character for the studied pozzolans.

关键词： Pozzolans Mineralogy Geochemistry Pozzolanicity Monogenetic volcanic fields Cameroon Volcanic Line

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Effects of cobalt doping on the reactivity of hausmannite for As(Ⅲ)oxidation and As(Ⅴ)adsorption

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Journal of Environmental Sciences 2022年第12期34卷 217-226页

作者： Shuang Zhang Hui Li Zhongkuan Wu Jeffrey EPost bruno lanson Yurong Liu Biyun Hu Mingxia Wang Limei Zhang Mei Hong Fan Liu Hui Yin Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River) Ministry of Agriculture and Rural affairsCollege of Resources and EnvironmentHuazhong Agricultural UniversityWuhan 430070China State Environmental Protection Key Laboratory of Soil Health and Green Remediation Ministry of Ecology and EnvironmentHuazhong Agricultural UniversityWuhan 430070China Department of Crop and Soil Sciences North Carolina State UniversityRaleighNorth Carolina 27695USA College of Environment Zhejiang University of TechnologyHangzhou 310014China Department of Mineral Sciences NHB 119Smithsonian InstitutionWashington DC 20013-7012USA UniversitéGrenoble Alpes Grenoble F-38000France CNRS IRDUniversity of Savoy Mont BlancFrance ISTerre UniversitéGustave EiffelFrance The Forestry Prospect Design Institute Of Hubei Province Wuhan 430070China College of Grassland Resources and EnvironmentInner Mongolia Agricultural UniversityHohhot 010018China

Hausmannite is a common low valence Mn oxide mineral,with a distorted spinel structure,in surficial *** natural Mn oxides often contain various impurities of transitional metals(TMs),few studies have addressed the effect and related mechanism of TM doping on the reactivity of hausmannite with metal ***,the reactivity of cobalt(Co)doped hausmannite with aqueous As(Ⅲ)and As(Ⅴ)was *** doping decreased the point of zero charge of hausmannite and its adsorption capacity for As(Ⅴ).Despite a reduction of the initial As(Ⅲ)oxidation rate,Co-doped hausmannite could effectively oxidize As(Ⅲ)to As(Ⅴ),followed by the adsorption and fixation of a large amount of As(Ⅴ)on the mineral *** K-edge EXAFS analysis of the samples after As(Ⅴ)adsorption and As(Ⅲ)oxidation revealed that only As(Ⅴ)was adsorbed on the mineral surface,with an average As-Mn distance of 3.25–3.30 A,indicating the formation of bidentate binuclear *** results provide new insights into the interaction mechanism between TMs and low valence Mn oxides and their effect on the geochemical behaviors of metal pollutants.

关键词： Mn oxide Hausmannite Transition-metal Cobalt Arsenate adsorption Arsenite oxidation

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