检索结果-南通市图书馆

Mars exploration——In situ K-Ar dating of jarosite

Science China Earth Sciences 2024年第3期67卷 641-656页

作者： Jing YANG Dewen ZHENG Ying WU Hong CHEN Li YANG Bin ZHANG Key Laboratory of Active Tectonics and Geological Safety Ministry of Natural ResourcesInstitute of GeomechanicsChinese Academy of Geological SciencesBeijing 100081China State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China Institute of Earth Sciences China University of GeosciencesBeijing 100083China Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029Chin

To accurately determine the chronological framework of climatic variations recorded by various Martian terrains, the absolute ages of Martian events and cratering rate need to be constrained by either in situ dating or returned samples. In situ K-Ar dating is currently a more plausible dating technique as compared with sample return. jarosite(KFe_(3)[SO_(4)]_(2)[OH]_(6)) is the only confirmed K sulfate mineral that is widely present on Mars, as indicated by in situ detection, orbital remote sensing, and meteorite studies. jarosite can be used for precise K-Ar and (40)Ar/(39)Ar dating. The preservation of jarosite on Mars provides information about the nature and duration of aqueous processes on the Martian surface. Different ages of Martian jarosite represent the key to constraining the transition from Martian surface water activity to arid climatic conditions. This paper summarizes recent advances in our knowledge of the spatial distribution of Martian jarosite, its mineralogical properties and stability on Mars, the Ar diffusion kinetics of jarosite, and the current status of in situ K-Ar dating. Moreover, we examine the key scientific issues to be addressed for in situ K-Ar dating of jarosite and Martian sample return missions, and discuss future research directions.

关键词： Mars jarosite In situ K-Ar dating Ar diffusion Stability

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis of plant-based biogenic jarosite nanoparticles using Azadirachta indica and Eucalyptus gunni leaf extracts and its application in Fenton degradation of dicamba

引用

Water Science and Engineering 2024年第2期17卷 157-165页

作者： Shivaswamy Bhaskar Basavaraju Manu Marikunte Yanjarappa Sreenivasa Arlapadavu Manoj Department of Civil Engineering National Institute of Technology CalicutKozhikode 673601KeralaIndia Deparment of Civil Engineering National Instute of Techogy KamatakaSurahalP.Srinivasnaga Mangaore5725Indi Department of Studies in Microbiology University of MysoreMysuru 570006KarnatakaIndia Department of Civil Enginering Siddaganga Institute of TechnologyTumkur 572103India

Bio-jarosite,an iron mineral synthesized biologically using bacteria,is a substitute for iron catalysts in the Fenton oxidation of organic *** nanocatalysts have been widely used as Fenton catalysts because they have a larger surface area than ordinary catalysts,are highly recyclable,and can be treated *** study aimed to explore the catalytic properties of bio-jarosite iron nanoparticles syn-thesized with green methods using two distinct plant species:Azadirachta indica and Eucalyptus *** focus was on the degradation of dicamba via Fenton *** synthesized nanoparticles exhibited different particle size,shape,surface area,and chemical composition *** particles were effective in removing dicamba,with removal efficiencies of 96.8%for *** bio-jarosite iron nano-particles(ABFeNPs)and 93.0%for *** bio-jarosite iron nanoparticles(EBFeNPs)within 120 min of *** the catalyst dosage by 0.1 g/L resulted in 7.6%and 43.0%increases in the dicamba removal efficiency for EBFeNPs and ABFeNPs with rate constants of 0.025 min^(-1) and 0.023 min^(-1),respectively,confrming their catalytic ***,the high efficiency of both catalysts was demonstrated through five consecutive cycles of linear pseudo-first-order Fenton oxidation reactions.

关键词： Acidithiobacillus ferrooxidans Fenton process jarosite Herbicide Dicamba Azadirachta indica Eucalyptus gunni

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

40Ar/39Ar ages and stable isotopes of supergene jarosite from the Baiyin VHMS ore field,NE Tibetan Plateau with paleoclimatic implications

40Ar/39Ar ages and stable isotopes of supergene jarosite fro...

引用

中国科学院地质与地球物理研究所2014年度（第14届）...

作者： Lei Chen Jianwei Li State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Faculty of Earth Resources China University of Geosciences

Supergene jarosite is widely distributed in weathering profiles derived from hypogene sulfide ***/Ar dating and determination of hydrogen and oxygen isotopes of supergene jarosite can not only place tight constraints on the timing and history of continental weathering and supergene enrichment of sulfide ore deposits,but also shed significant insights into paleoclimatic conditions and tectonic uplift responsible for the *** this paper,we present a preliminary study ofAr/Ar geochronology and stable isotope geochemistry of supergene jarosite from the early Paleozoic Zheyaoshan volcanic-hosted massive sulfide deposit of the Baiyin ore field located in the eastern portion of the Qilian Mountain along the northeastern(NE)margin of the Tibetan Plateau in an attempt to better understand the climatic conditions prevailed during the pervasive weathering in the *** from the Zheyaoshan mining area occurs either as gravels within alluvial deposits over low-relief flat-top hills or cm-wide veins crosscutting weathered sulfide ores or their wall *** gravels consist of massive jarosite aggregates with tabular crystal morphology and contain 8.21 wt%-8.31 wt%KO on *** jarosite grains extracted from the gravels(08-02-2 and 08-02-5)yield well-definedAr/Ar plateauages of 37.1±0.3 and 41.2±0.4 Ma(2σ),*** haveδD values of-133‰and-156‰,andδOvalues of 2.6‰and 2.5‰.The vein-type jarosite consists of hexagonal pyramid crystals and contains much lower KO,averaging at 2.44 wt%-2.72 wt%.Two jarosite veins(06-16-3 and 06-16-4)yield similar plateau ages of 3.2±0.1 and 3.3±0.1 Ma(2σ),*** jarosite veins haveδD values of—158‰and-160‰,andδOvalues of 2.8‰and 2.5‰.TheAr/Ar ages indicate that sulfide ores of the Zheyaoshan deposit must have been brought to the surface since the late Eocene,and subsequently subjected to prolonged oxidation and supergene *** precipitation and preservation of jarosite in weathering profil

关键词： jarosite 40Ar/39Ar geochronology Stable isotopes Qilian Mountain Paleoclimate

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Leaching of nickel laterite ore assisted by microwave technique

引用

Transactions of Nonferrous Metals Society of China 2010年第S1期20卷 77-81页

作者：翟秀静武强符岩马林芝范川林李乃军 School of Materials and Metallurgy Northeastern University

The application of microwave technique in the hydrometallurgy of nickel laterite ores was *** mixture of nickel laterite ores and sulfuric acid was pre-treated by microwave *** dissolving of nickel was conducted in hot water at the atmospheric *** effects of factors,such as microwave power,microwave irradiation time,and sulfuric acid dosage, were *** microwave field,the migration of ionic species and/or rotation of dipolar species promote the liquid?solid reaction process due to the increased contact area of reactants and leaching reaction rate *** to the strengthening action of microwave,the microwave-assisted leaching process has its advantages,such as higher extracting rate than conventional atmospheric leaching,and no need for high-pressure operation as high pressure acid leaching(HPAL).The ferric iron in leaching solution could be effectively removed by sodium jarosite process with a little loss of nickel in the jarosite precipitate.

关键词： nickel laterite ore leaching microwave jarosite pre-treatment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：