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津巴布韦关达绿岩带西北采矿区的金矿床

华北地质 1988年第4期 223-234页

作者： W.A.H.Fuchter c.j.hodgson 李上森

引言本文报道在津巴布韦关达绿岩带西北采矿区进行野外工作的初步成果。关达绿岩带是一条北西西走向的太古宙上壳岩带,它位于津巴布韦西南部的梅塔贝拉勒兰南省内。关达城是一个小的采矿和畜业中心,也作为当地政府的行政管理总部。该层... 详细信息

引言本文报道在津巴布韦关达绿岩带西北采矿区进行野外工作的初步成果。关达绿岩带是一条北西西走向的太古宙上壳岩带,它位于津巴布韦西南部的梅塔贝拉勒兰南省内。关达城是一个小的采矿和畜业中心,也作为当地政府的行政管理总部。该层位于绿岩带中部附近,地处布拉瓦约南南东约120km处。西北采矿区,是直接位于关达西北部一个向形构造北翼的一个北北西走向、大约18km长、2km宽的区域内。

关键词：绿岩带黄铁矿硫化物铁矿物硫化合物条带状铁建造矿脉矿体岩石韧性剪切带金矿床贵金属矿床硫化矿物毒砂砷黄铁矿津巴布韦南罗得西亚采矿区

巨型中温热液金矿床的特征描述成因模式及勘查区的选择准则

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内蒙古地质 1999年第4期 1-36页

作者： c.j.hodgson D.A.Love j.V.Hamilton 加拿大安大略省Queen大学地质科学系

中温热液金矿床赋存在由花岗岩侵位的碰撞造山带的各个时代的以火山岩为主和沉积岩为主的上壳岩带内。贫的和富的成矿带的主要区别是，富矿带容纳有异常大的矿床。这一模式是对区域内所属不同成矿带的矿区间进行成矿贫富性的详细对比而... 详细信息

中温热液金矿床赋存在由花岗岩侵位的碰撞造山带的各个时代的以火山岩为主和沉积岩为主的上壳岩带内。贫的和富的成矿带的主要区别是，富矿带容纳有异常大的矿床。这一模式是对区域内所属不同成矿带的矿区间进行成矿贫富性的详细对比而得出的。我们对该区域４７个巨型（＞６０ｔＡｕ）中温热液金矿床的地质特征和背景的研究表明，８０％的金矿床产在以火山岩为主的上壳岩带，而２０％的金矿床产在沉积岩为主的上壳岩带。几乎没有证据能够说明巨型矿床的产生是受矿物沉积规模所控制。例如：围岩岩性的复杂性控制着矿床构造的复杂性，而与矿床规模无关。从区域上讲，不管怎样，巨型金矿床特定的有利的岩石组合并可能与早期形成的金矿化体有显著关系。多数以火山岩为主的上壳岩带内的巨型金矿床出现在具有高镁火山岩（科马提岩）或侵入的岩带内，其中２０％与长英质火山岩共生；７５％含有前变质高铝热液蚀变矿物组合。一个巨型矿床和许多小型矿床与斑岩型Ｃｕ－Ａｕ矿化关系密切。赋存在前寒武纪以沉积岩为主的上壳岩带内的巨型金矿床均以含铁建造为主，但在显生宙以沉积岩为主的上壳岩带内的矿床却不是这样。解释中温热液金矿床的共有特征，金矿床矿物学特有的事实说明与围岩环境有关。

关键词：热液金矿床含铁建造矿床规模巨型矿床侵入岩容矿岩石成因模式前寒武纪火山岩带绿岩带

加拿大魁北克德马雷斯维莱区拉克肖特金矿床地质的初步研究

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华北地质 1988年第3期 168-172页

作者： Suzanne Morasse c.j.hodgson jayanta Guha Alain coulombe 骆辉

前言福尔肯布里奇铜矿有限公司的拉克肖特金矿床,位于魁北克的德马雷斯北东25公里、奇布甘麦南西120公里的甘德地区。1978年,福尔肯布里奇有限公司是继以前三个没有获得可采储量的钻探计划后而挑选了这个矿床的。1984年9月开始生产,在50... 详细信息

前言福尔肯布里奇铜矿有限公司的拉克肖特金矿床,位于魁北克的德马雷斯北东25公里、奇布甘麦南西120公里的甘德地区。1978年,福尔肯布里奇有限公司是继以前三个没有获得可采储量的钻探计划后而挑选了这个矿床的。1984年9月开始生产,在500米深范围内,以3.0g/t为边界品位内,圈定了含金6.0g/t的矿石储量大约2百万吨,每天预采储量750吨。

关键词：岩石类型岩石分类金矿床贵金属矿床下盘肖特方解石脉矿体火山岩喷出岩火成岩断层地质构造白云石镁肥拉克魁北克加拿大

西澳大利亚卡姆巴尔达的维克托利金矿的构造和变质环境

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华北地质 1988年第4期 212-223页

作者： M.E.clark N.j.Archibald c.j.hodgson 骆辉胡小蝶

引言西澳卡姆巴尔达维克托利金矿位于太古宙伊尔岗地块中东部的诺西曼-威卢纳绿岩带。卡姆巴尔达地区主要由层状变质科马提质熔岩、科马提质玄武岩、富-Mg玄武岩、拉斑玄武质玄武岩和沉积岩夹层组成。这些层序在构造上并列于长英质火山... 详细信息

引言西澳卡姆巴尔达维克托利金矿位于太古宙伊尔岗地块中东部的诺西曼-威卢纳绿岩带。卡姆巴尔达地区主要由层状变质科马提质熔岩、科马提质玄武岩、富-Mg玄武岩、拉斑玄武质玄武岩和沉积岩夹层组成。这些层序在构造上并列于长英质火山岩和碎屑沉积层序。卡姆巴尔达地区和大部分诺西曼-威卢纳带的构造以北-北西直立断层带和遍布的北-北西构造系为主,大片区域应变发生在可能延展数百公里的这些断层带内。泥质岩组合表明,卡姆巴尔达地区岩石的最高变质作用为低角闪岩相,维克托利矿区的进变质或退变质组合明显取决于局部碳酸盐的发育程度。

关键词：金矿化绿泥石黑云母阳起石黄铁矿粘土矿物角闪石铁矿物石英脉角砾岩带矿体矿脉钠长石岩断裂带断层带矿物共生组合基性岩玄武岩容矿岩石铁白云石卡姆巴尔维克托

consumer transparency in the production chain for plant varieties produced using new genomic techniques

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aBIOTEcH 2024年第2期5卷 239-246页

作者： j.M.Lukasiewicz c.c.M.van de Wiel L.A.P.Lotz M.j.M.Smulders Wageningen University&Research P.O.Box 386NL-6700 AJ WageningenThe Netherlands

Plants edited with new genomic techniques(NGTs)currently fall under the Genetically Modified Organisms Directive(2001/18/Ec)in the European *** the proposal of the European commission,NGT plants are partially exempted from the regulations of this *** proposal makes a distinction between two categories of NGT plants:NGT-1 and ***-1 category plants are considered equal to plants obtained through conventional breeding *** plants will not be labelled for the consumer,although they will be labelled as ***-2 category plants may be labelled with additional information as a positive *** of seeds of varieties made with gene editing,but not the products,would mean that most steps in the production chain are transparent,but not the last step towards ***“right to know”and increasing knowledge of gene-edited food is a common theme in food labelling towards ***,we describe current labelling regimes and registers and how these may be applied to provide transparency on gene-edited products to ***,we also look into consumer studies,which indicate a greater acceptance of gene-edited food among consumers,especially when additional benefits such as sustainability are mentioned.

关键词： Labelling New genomic techniques consumer transparency Plant products

Semi-analytical investigation of heat transfer in a porous convective radiative moving longitudinal fin exposed to magnetic field in the presence of a shape-dependent trihybrid nanofluid

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Applied Mathematics and Mechanics(English Edition) 2024年第1期45卷 197-216页

作者： c.G.PAVITHRA B.j.GIREESHA M.L.KEERTHI Department of PG Studies and Research in Mathematics Kuvempu UniversityShankaraghatta 577451India Department of Mathematics and Statistics M.S.Ramaiah University of Applied SciencesBengaluru 560058India

The thermal examination of a non-integer-ordered mobile fin with a magnetism in the presence of a trihybrid nanofluid(Fe_3O_4-Au-Zn-blood) is carried out. Three types of nanoparticles, each having a different shape, are considered. These shapes include spherical(Fe_3O_4), cylindrical(Au), and platelet(Zn) configurations. The combination approach is utilized to evaluate the physical and thermal characteristics of the trihybrid and hybrid nanofluids, excluding the thermal conductivity and dynamic viscosity. These two properties are inferred by means of the interpolation method based on the volume fraction of nanoparticles. The governing equation is transformed into a dimensionless form, and the Adomian decomposition Sumudu transform method(ADSTM) is adopted to solve the conundrum of a moving fin immersed in a trihybrid nanofluid. The obtained results agree well with those numerical simulation results, indicating that this research is reliable. The influence of diverse factors on the thermal overview for varying noninteger values of γ is analyzed and presented in graphical representations. Furthermore, the fluctuations in the heat transfer concerning the pertinent parameters are studied. The results show that the heat flux in the presence of the combination of spherical, cylindrical, and platelet nanoparticles is higher than that in the presence of the combination of only spherical and cylindrical nanoparticles. The temperature at the fin tip increases by 0.705 759% when the value of the Peclet number increases by 400%, while decreases by 11.825 13% when the value of the Hartman number increases by 400%.

关键词： convection radiation moving longitudinal fin Adomian decomposition Sumudu transform method(ADSTM) trihybrid nanofluid magnetic field

Thermoluminescence characterization of natural and synthetic irradiated ce-monazites

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journal of Rare Earths 2024年第4期42卷 643-650页

作者： V.correcher c.Boronat j.Garcia-Guinea j.F.Benavente T.Rivera-Montalvo cIEMAT Av.Complutense 4028040MadridSpain MNcN-cSIc J.Gutierrez Abascal 228006MadridSpain Instituto Politécnico Nacional CICATA-IPNAv.Legaria 694Mexico City11500Mexico

The thermoluminescence(TL)emission of synthetic and natural ce-monazites was characterized here to determine the potential application in the identification of microscopic defects from a qualitative point of view trying to link each TL peak to a chemical-physical *** kinetic parameters that lead the luminescence processes were calculated by means of variable heating rate and computing glow curve deconvolution methods and allow identifying three groups of components at~90,130 and 290℃(for the mineral sample)and~90,170,220,270 and 320℃(for the synthetic cePO_(4):Nd_(0.20),La_(0.25)).The main differences appreciated in these complex TL curves are mainly due to(i)the content of impurities(natural sample contains lanthanides as well as U 0.60%and Th 5.22%)and(ii)the degree of crystallinity of the samples which is directly related to the type of impurities(synthetic monazite relies only on Nd and La).The behavior of the dose response in the range of 1-8 Gy is similar for both samples;the TL intensity increases linearly as the dose increases without changes in the position of the maxima,denoting first-order kinetic luminescence *** peak could be mostly associated with structural defects(i.e.,phase transitions),chemical reactions(i.e.,ce3+?ce4+redox reaction,dehydration or dehydroxylation processes)or intrinsic defects(i.e.,Frenkel defects,ODcs or NBOHcs).

关键词： Thermoluminescence Kineticparameters Phosphate ce-monazite Defects Rare earths

A marathon,not a sprint:Increasing population physical activity as a legacy of sports mega-events

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journal of Sport and Health Science 2024年第6期13卷 732-735页

作者： Fiona c.Bull Paul j.Simpson Physical Activity Unit Department of Health PromotionWorld Health OrganizationGeneva CH-1211Switzerland The BMj London WC1H 9JPUK

*** matters The withdrawal of Australia as hosts for the commonwealth Games in 2026 demonstrates that large international sporting events are more than just sporting mastery,medals,and *** also matters.1 The cost of hosting a major international tournament is eye-wateringly *** governments need to show that the billions of dollars of investment deliver a return beyond sporting glory to justify the resources that are spent.

关键词： return dollar sport

cO oxidation under lean and stoichiometric conditions over ceriazirconia with very low metal contents(cu,co,Ag and Pt)

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journal of Rare Earths 2024年第9期42卷 1669-1681,I0002页

作者： j.c.Martínez-Munuera M.P.Yeste A.García-García McMA Group Department of Inorganic Chemistry and Institute of MaterialsUniversity of AlicanteCarretera de San Vicente del Raspeig s/n03690San Vicente del RaspeigAlicanteSpain Solid chemistry and catalysis Group Department of Materials ScienceMetallurgic Engineering and Inorganic ChemistryInstitute of Electronic Microscopy and Materials ResearchUniversity of CádizAp.40E-11510Puerto RealCádizSpain

In this work,several ceria-zirconia based catalysts with very lo w(and equimolar) metal contents were prepared,characterised and tested for the cO oxidatio n reaction(under lean and stoichiometric conditions),trying to emulate those conditions found in a diesel oxidation catalyst(DOc) system from a diesel engine and those encountered under gasoline exhaust(λ=1).The metals chosen are cu,co,Ag and Pt(as a reliable benchmark).The results reveal enormous differences among reducibility and catalytic activity despite quite similar structural and textural properties of the catalysts,showing differences among dispersion(Ag-catalyst seems to present a low level of dispersion).This catalyst seems to be characterised,as well,by a strong electronic interaction between ce and Ag centres which is suggested to yield an improved reducibility under H_(2)-TPR ***,the order in catalytic activity(cu>Ag>co≈Pt>>support) seems not to follow the order found in reducibility and the cu-catalyst seems to be the most active independently on the reaction conditions,yielding nearly overlapped cO oxidation catalytic *** restingly,a stro ng correlation between the catalytic activity under the two conditions tested and the OSc values of the ce_(0.8)Zr_(0.2)O_(2)-supported metal catalysts is ***,OSc parameter measured at 150℃ can be used as a relevant descriptor to evaluate the cO oxidation activity at low and medium conversions for the investigated catalysts,much better than the H_(2)-TPR measurements.

关键词： cO oxidation Low metal content ceria-zirconia copper species OSc parameter Rare earths